US20010024170A1 - Random noise radar target detection device - Google Patents
Random noise radar target detection device Download PDFInfo
- Publication number
- US20010024170A1 US20010024170A1 US09/874,527 US87452701A US2001024170A1 US 20010024170 A1 US20010024170 A1 US 20010024170A1 US 87452701 A US87452701 A US 87452701A US 2001024170 A1 US2001024170 A1 US 2001024170A1
- Authority
- US
- United States
- Prior art keywords
- signal
- returned
- target
- radar system
- electromagnetic signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C13/00—Proximity fuzes; Fuzes for remote detonation
- F42C13/04—Proximity fuzes; Fuzes for remote detonation operated by radio waves
- F42C13/042—Proximity fuzes; Fuzes for remote detonation operated by radio waves based on distance determination by coded radar techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
- G01S13/346—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal using noise modulation
Definitions
- Th is a required detection threshold in dB.
Abstract
A radar system (10) which transmits a random noise signal. The transmitted signal is embodied as an electromagnetic signal and is directed at an object or target. The object or target reflects at least a portion of the electromagnetic signal which is returned to the radar system. An image of the electromagnetic random noise signal is stored in memory (16) and compared with the returned modulated signal. Based on the correlation value, a determination is made regarding the object or target. In a particular implementation, the radar system is used in a target detection device (TDD) (10) in order to determine the distance from the target or object to the device and the relative velocity of the target or object and the device. When the target or object reaches a predetermined distance and also satisfies any other system requirements, the TDD (10) initiates a detonation signal which causes detonation of the missile or warhead.
Description
- This application is a continuation of U.S. patent application Ser. No. 09/326,829, filed on Jun. 7, 1989, the disclosure of which is incorporated herein by reference.
- In a typical radar system, a radar antenna radiates a signal in the direction of an object which is the subject of the radar inquiry. A portion of this energy is reflected from the object back toward the radar system which receives and processes this reflected energy to extract information regarding the object. For example, in relatively simple systems, the relative velocity between the object and the radar system can be determined in accordance with the Doppler shift between emission and return of the signal. In more complex radar systems, signal processing techniques performed on the reflected signal may yield data regarding the size, shape, range, and direction of the object.
- In some radar applications, the object may carry radar jamming systems which detect the emitted signal, modify it in one or more ways known to those skilled in the art, and retransmit the modified signal so as to deceive the radar system. A radar signal that is deterministic and periodically repeats, is more vulnerable to deceptive jamming than one that never repeats in time.
- For example, a Target Detection Device (TDD), sometimes referred to as a fuze, is commonly found in a guided missile. Many TDD determine the distance between the missile and the target, and when the missile reaches a predetermined distance to the target, the TDD detonates the missile warhead to achieve maximum impact on the target. In such applications, the targets may be equipped with radar jamming systems such as digital radio frequency memory systems (DRFMs) which store the incoming radar signal in memory and determine the repeat interval of the signal. The DRFM then emits a signal replicating the return signal expected by the radar system back to the TDD. The signal emitted by the DRFM is delayed to apparently arrive before the reflected signal would normally arrive for the given distance between the radar system and the DRFM. This signal deceives the radar system into determining that the object is closer than it actually is.
- Existing TDDs use repetitive waveforms to enable range determination. One example of waveform modulation is a pseudo-random noise sequence. In the pseudo-random noise sequence, the radar system emits binary sequences characteristic of a noise waveform, but which is repeated after a predetermined time interval. Another modulation format is frequency modulation continuous wave (FMCW), also referred to as swept-frequency or chirp waveforms. Yet another modulation format is medium pulse repetition rate. In a medium pulse repetition rate radar, the transmit waveform modulation is a train of pulses, and the range to an object is determined by the delay between transmission and reception of the pulse.
- The above-described waveforms are deterministic. The deterministic characteristic enables intelligent targets that carry repeater jammers to store the TDD signal, delay it beyond the period where the signal repeats itself, and retransmit the delayed signal back toward the TDD delayed so that the target appears closer to the TDD than it actually is. The TDD in such instances typically detonates the missile warhead at a range beyond the lethal radius of the weapon.
- One particular radar system employs TDDs having multiple radio frequency phases. For example, in one multiple radio-frequency phase missile application, a 255-bit or 511-bit, maximal-length sequence, pseudo-random waveform modulation is used to detect the range from the missile to the target. This pseudo-random code bi-phase modulates the radio frequency (RF) carrier. The modulation of the signal returned from the target is correlated with delayed images of the originally emitted code. A correlation occurs when the delay is equivalent to twice the target range. Samples of the correlated output are then processed by standard signal processing techniques so that the target is detected.
- For example, assume an approximate signal propagation velocity of one foot per nanosecond and a straight line two-way travel path. If the time delay of a single bit of the code modulation is ten nanoseconds (ns) then a delay of one bit in the returned signal would indicate a distance to the target of five feet. Similarly, five bits or 50 nanoseconds of delay indicates a range of 25 feet, and a 255-bit delay indicates a range of 1275 feet. This range for a 255-bit, 1275 feet, is called the unambiguous range. Delays beyond 255-bits fall into an ambiguous range. For example, a delay of 256-bits indicates a range of 5 feet because the periodic nature of the 255-bit code. Thus, if a radar jammer can store the repetitive waveform, amplify it, and transmit the waveform back with the proper delay, the target carrying the jammer can be made to look closer in range than it actually is.
- Thus, it is an object of the present invention to provide a radar system which emits a random electromagnetic signal at a target in order to provide information regarding the target.
- It is a further object of the present invention to provide a radar system which receives a random, electromagnetic signal returned from an object illuminated with a random, electromagnetic signal emitted by the radar system, and provides information about the object.
- It is yet a further object of the present invention to provide a radar system which emits an electromagnetic signal modulated by random noise in the direction of a target and receives a reflected electromagnetic signal returned from the object and determine the distance to the object.
- It is yet a further object of the present invention to provide a Target Detection Device (TDD), sometimes called a fuze, which uses an electromagnetic signal modulated by random noise directed at an object and receives a reflected electromagnetic signal returned from the object in order to determines the distance to the object.
- It is yet a further object of the present invention to provide a Target Detector Device which uses an electromagnetic signal including or modulated by random noise directed at an object and receives a reflected electromagnetic signal returned from the object in order to determine the distance to the object and further determine the velocity of the object relative to the radar.
- It is yet a further object of the present invention to provide a Target Detection Device which uses an electromagnetic signal consisting of or modulated by random noise directed at an object and receives a reflected electromagnetic signal returned from the object in order to provide a distance to the object, the velocity of the object relative to the radar and further generate control commands in accordance with the distance and velocity of the object.
- In accordance with the teachings of the present invention, this invention is directed to a Target Detection Device (TDD), sometimes called a fuze, for determining the distance to an object. The Target Detection Device includes a source of random noise for modulating an electromagnetic signal that is emitted in the direction of the object, where the object reflects back at least a portion of the electromagnetic signal. A receiver detects the random, electromagnetic signal returned from the object. A correlation processor then cross correlates the modulation on the emitted electromagnetic signal with the modulation on the returned electromagnetic signal. A signal processor receives the outputs from the correlation processor and determines the distance to the object and its velocity relative to the TDD.
- Additional objects, features and advantages of the present invention will become apparent from the following description and the appended claims, taken in connection with the accompanying drawings.
- Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limited the scope of the invention.
- The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
- FIG. 1 is a block diagram of the radar system arranged in accordance with the principles of the present invention;
- FIG. 2 is a diagram of the input and output waveforms for the system of FIG. 1; and
- FIG. 3 is a diagram of the waveforms for one sample period of the waveforms of FIG. 2.
- The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
- FIG. 1 is a block diagram of an exemplary Target Detection Device (TDD), also referred to as a fuze, arranged in accordance with the principles of the present invention. The TDD10 includes a random
noise modulation source 12 which generates a purely random noise signal with a bandwidth that is determined by the system range resolution requirements. For example, a bandwidth of 125 MHz will enable system range gates having a width of approximately four feet along the line of sight from theTDD 10 to the object to be interrogated by theTDD 10. The noise generated bynoise modulation source 12 is centered at the system transmit frequency and can be generated by several methods known to those skilled in the art.Noise modulation source 12 also includes a switch that can be used to switch the noise-modulated signal on and off in pulsed-noise operation. The random noise signal is passed to the transmit/receivesystem 14, commonly referred to as a radio frequency (RF) seeker head system, where it is amplified and transmitted via one or more transmitantennas 19. A portion of the transmit signal is coupled by way of acoupler 17 to adown converter 13. Downconverter 13 is driven by alocal oscillator 15, which is centered at the transmit frequency. Inphase and Quadrature (I & Q) components of the down-converted random transmit signal are amplified to the required level invideo amplifier 23 and then output to 1-bit samplers (comparators) 24. The sampled outputs of thesamplers 24 are passed torandom noise correlator 16. I & Q processing provides both magnitude and sense (incoming or outgoing) of the velocities of objects in the radar field of view. The use of I & Q processing is well understood by those skilled in the art of digital signal processing. - Transmit/receive
system 14 also includes one ormore receiving antennas 20 to detect the return signal reflected from thepre-selected object 8. Random noise transmit/receivesystem 14 includes a homodyne receiver that consists of a limiter-attenuator-amplifier network 21 for this exemplary TDD. The output of limiter-attenuator-amplifier network 21 is passed to a down converter 22 that is also driven by thelocal oscillator 15. I & Q components of the down-converted received signal are amplified to the required level invideo amplifier 25 and then output to 1-bit samplers 26. The sampled outputs of thesamplers 26 are passed to arandom noise correlator 16. As will be understood by one skilled in the art, sampling devices that quantize the random modulation by more than one bit could also be used to provide enhanced performance. - In the embodiment of FIG. 1, one-
bit samplers video amplifiers bit samplers samplers digital signal processor 32 rather than a conventional variable-threshold, constant false alarm rate detector with its inherent loss as is normally required in a detection system. - In
random noise correlator 16, samples of the transmitted random noise modulation signal are passed through a series of one-bit delay elements. The number of delay elements is predetermined in accordance with the number of range gates, to be described herein, required for a particular application. For example, a specific application may employ 15 range gates per channel, which would require 14 delay elements. The delayed images of the transmitted random noise modulation signal are cross correlated with the modulation samples from the signal return signal. Thus, the detection process performed inrandom noise correlator 16 is coherent upon reception even though the transmit signal is random. The range gate output of therandom noise correlator 16 for each unit of delay (range gate) of interest is passed to thedigital signal processor 32 where it is processed using well-known signal processing techniques to find the range and closing velocity (Doppler frequency) of objects in the field of view.Digital signal processor 32 also performs additional operations on the cross correlated range-gate data out of therandom noise correlator 16 such as decimation sampling and filtering on the input data, detection thresholding, RF seeker control, data acquisition control, antenna select control, noise modulation source waveforem generation, and burst point or destination point calculations.Digital signal processor 32 outputs a control command to the detonation device of the missile.Digital signal processor 32 also outputs control commands to transmit/receivesystem 14. Amaster clock 31 synchronizes operation of therandom noise correlator 16 and thedigital signal processor 32. - Of particular interest in this invention is the use of
random noise source 12 to generate a random noise signal that is centered at the system operating frequency. This signal is then emitted by transmit/receivesystem 14. The random noise defeats systems which search for repetition in the emitted signal, attempt to copy the emitted signal, and transmit it back to theantenna system 14 with a delay which causes the object to appear closer than it actually is. FIG. 2 graphically illustrates the transmission, return, and processing of waveforms to implement the present invention. - Referring to FIG. 2, a purely random noise signal is generated and, as described in FIG. 1, is passed to transmit/receive
system 14 and also sampled and input torandom noise correlator 16, which saves a replica of the transmit random noise signal. The randomly generatednoise signal 40 is output by the transmit/receivesystem 14. As shown in FIG. 2, transmitwaveform 40 is pulsed because of the relatively close proximity of the transmit and receive antennas in some radar applications and most TDD applications. The pulsed transmit waveform significantly reduces coupling of the transmit signal back into the receive antenna and accompanying RF receiver. This coupling is typically referred to as leakage. The pulsed signal arrangement alleviates the need to address the difficult task of providing sufficient isolation between the transmit and receive channels so that the return signal is of sufficiently greater power than the leakage. This is particularly applicable where the apparent radar cross-section of theobject 8 is relatively small. Consequently, the input receiver ofantenna system 14 is gated off during the transmit time. As is known in the art, the exact parameters for pulsing the transmitwaveform 40, such as duty cycle and repetition frequency, are adjusted to minimize detection desensitization due to clutter in a high-clutter environment. - The transmit
waveform 40 strikes an object ortarget 8 and is reflected back as the target return signal orwaveform 42. Asampling interval 44 defines the period for transmitting the transmitwaveform 40 and varies in accordance with the particular application. Further, a predetermined number ofsampling intervals 44 define acorrelation interval 46, and a predetermined number ofcorrelation intervals 46 define acoherent processing interval 48. Thecorrelation interval 46 and thecoherent processing interval 48 are each selected in accordance with the particular radar application, as will be understood by one skilled in the art. - FIG. 3 depicts an expanded view of
block 48 of FIG. 2. FIG. 3 includes the transmitwaveform 40, thetarget return waveform 42, and a number of rangegate sampling waveforms gate sampling waveforms RNR ASIC 16. Each rangegate sampling waveform - The
target return signal 42 is typically sampled in I & Q at a rate for each approximately equal to the bandwidth of the transmitted noise, 125 megahertz (MHz), for example. The samples for the earliest range gate waveform,range gate 1sampling waveform 50, for example, commences at the start of transmitwaveform 40. Samples for the next range gate sampling waveform,range gate 2sampling waveform 52, are delayed by one sampling period which is the reciprocal of the sampling frequency. Thus, the range gate width is effectively equal to the two-way travel time of the transmit pulse of one sample. The range gate width is approximately four feet for the range gates of FIG. 3 for this exemplary implementation. The total number of range gates vary in accordance with the operational range for a given radar system orTDD 10. - If the
target return waveform 42 overlaps the transmitwaveform 40, the receiver is typically gated off, and the return power as seen by any range gates during this receiver-off interval will be eclipsed. In normal TDD applications, this does not occur because the target detection process is desensitized at close range to prevent mistaken identity of targets smaller than the intended target. In radar environments where interference such as clutter is minimized or where the target return waveform power sufficiently exceeds the antenna leakage power, the duty cycle of the random noise may be increased to 100%. - The example depicted in FIGS.2-3 employs single-bit sampling in order to enable high-speed sampling, thereby eliminating the need for high-speed analog to digital conversions. This effectively causes a loss in detection capability as would be provided by multiple-bit signal quantization of less than three decibels if the receiver gain is selected so that thermal noise saturates the receiver. Thus, with the system saturated by thermal noise, the noise/interference floor during signal processing is fixed. Therefore, a fixed threshold can be used for detection, thereby eliminating the normal loss associated with a constant false alarm rate detector.
- In addition, with single-bit sampling, XOR gates can be used as the complex multiplier to cross-correlate the target return waveform samples with the delayed image of the random noise waveform samples. The range counters in the
random noise correlator 16 count the number of correlations over the correlation interval. At the end of acorrelation interval 46, the counter value for eachrange gate - After N correlation intervals, defined as a
coherent processing interval 48, thedigital signal processor 32 can coherently process the end values output by each range gate counter in therandom noise correlator 16 using standard range-Doppler signal processing techniques well known in the art. The post processing occurring indigital signal processor 32 occurs at a relatively low processing frequency relative to the computational through-put rate. A special GaAs ASIC chip that controls the noise correlator processing has been designed to operate at sampling rates in excess of 1.5 GHz. For lower-speed system requirements, many other technologies can accomplish the same task. - Using this process, any coherent or incoherent out-of-range signal is distributed uniformly during Doppler processing occurring in
digital signal processor 32. Detection is thus limited to the product of the noise sampling bandwidth (B) and the length (T) of thecoherent processing interval 48 to define a time-bandwidth (TB) product of the processing. Further, in order to detect a signal, the magnitude S of the signal at the output of the digital signal processor must exceed the power of the noise/interference N minus the time-bandwidth (TB) plus the required detection threshold (Th). That is, in order for a signal to be detected, - S>(N−TB+Th),
- where
- S is the magnitude of the signal in dB;
- N is the power of the noise/interference in dB;
- TB is the time-bandwidth product in dB; and
- Th is a required detection threshold in dB.
- This time-bandwidth detection requirement is well understood by one skilled in the art.
- From the foregoing, it can be seen that this invention provides a radar detection system which uses random noise to modulate a carrier signal emitted by the radar in the direction of a target. A particular advantage of this invention is that the random noise signal does not repeat so that the target cannot copy the signal and relay the signal back to the radar system with an apparent delay less than the true delay.
- Although the invention has been described with particular reference to certain preferred embodiments thereof, variations and modifications can be effected within the spirit and scope of the following claims.
- The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
Claims (5)
1. A radar system for providing information on a selected object, comprising:
a source of pure random noise for modulating the radio frequency carrier of a transmitter for transmitting a random, electromagnetic signal in the direction of the object, the object reflecting back at least a portion of the electromagnetic signal;
an antenna for capturing the random electromagnetic signal returned from the object, the returned signal also being a delayed replica of the transmitted signal;
a receiver for amplifying the random, electromagnetic signal returned from the object;
a correlation processor for crosscorrelating the modulation on the transmitted electromagnetic signal with the modulation on the returned electromagnetic signal; and
a signal processor for receiving output from the correlation processor and determining information on the selected object, the signal processor generating control commands to operate a TDD.
2. The radar system of wherein the correlation processor is an application specific integrated circuit (ASIC).
claim 1
3. The radar system of wherein the signal processor determines the Doppler shift of the transmitted versus the received electromagnetic signal, the Doppler shift varying in accordance with the relative velocity between the TDD and the object.
claim 1
4. The radar system of wherein the antenna transmits the randomly modulated radio frequency carrier signal.
claim 1
5. The radar system of wherein the correlation processor is an application specific integrated circuit (ASIC), further comprising:
claim 1
a plurality of delay elements to generate a series of range gates for processing the returned electromagnetic signal;
a plurality of correlation elements for crosscorrelating the modulation on the transmitted and returned electromagnetic signals to determine a match between the two signals to indicate the range between the TDD and the object; and
a plurality of counters counting the matches between the modulation on transmitted and returned random electromagnetic signals to define a measure of the cross correlation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/874,527 US6392585B2 (en) | 1999-06-07 | 2001-06-05 | Random noise radar target detection device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/326,829 US6271786B1 (en) | 1999-06-07 | 1999-06-07 | Random noise radar target detection device |
US09/874,527 US6392585B2 (en) | 1999-06-07 | 2001-06-05 | Random noise radar target detection device |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09326829 Continuation | 1989-06-07 | ||
US09/326,829 Continuation US6271786B1 (en) | 1999-06-07 | 1999-06-07 | Random noise radar target detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010024170A1 true US20010024170A1 (en) | 2001-09-27 |
US6392585B2 US6392585B2 (en) | 2002-05-21 |
Family
ID=23273893
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/326,829 Expired - Lifetime US6271786B1 (en) | 1999-06-07 | 1999-06-07 | Random noise radar target detection device |
US09/874,527 Expired - Lifetime US6392585B2 (en) | 1999-06-07 | 2001-06-05 | Random noise radar target detection device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/326,829 Expired - Lifetime US6271786B1 (en) | 1999-06-07 | 1999-06-07 | Random noise radar target detection device |
Country Status (3)
Country | Link |
---|---|
US (2) | US6271786B1 (en) |
AU (1) | AU7981300A (en) |
WO (1) | WO2001001166A2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060087472A1 (en) * | 2004-10-22 | 2006-04-27 | Time Domain Corporation | System and method for triggering an explosive device |
US20070085727A1 (en) * | 2005-10-19 | 2007-04-19 | Honeywell International Inc. | Methods and systems for leakage cancellation in radar equipped munitions |
US20090295619A1 (en) * | 2005-10-24 | 2009-12-03 | Mitsubishi Electric Corporation | Object Detection |
CN103217670A (en) * | 2013-03-29 | 2013-07-24 | 电子科技大学 | Outer radiation source weak signal detection method based on PCA (principal component analysis) |
ITRM20130120A1 (en) * | 2013-02-28 | 2014-08-29 | Mbda italia spa | RADAR PROXIMITY SPOOL AND METHOD OF PROCESSING AN ECO RADAR SIGNAL FOR THE ACQUISITION OF DISTANCE INFORMATION BETWEEN A TARGET AND A DOPPLER RADAR |
WO2018092232A1 (en) * | 2016-11-17 | 2018-05-24 | 三菱電機株式会社 | Radar device and control system |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6720920B2 (en) | 1997-10-22 | 2004-04-13 | Intelligent Technologies International Inc. | Method and arrangement for communicating between vehicles |
US9443358B2 (en) | 1995-06-07 | 2016-09-13 | Automotive Vehicular Sciences LLC | Vehicle software upgrade techniques |
US10240935B2 (en) | 1998-10-22 | 2019-03-26 | American Vehicular Sciences Llc | Vehicle software upgrade techniques |
US6271786B1 (en) * | 1999-06-07 | 2001-08-07 | Raytheon Company | Random noise radar target detection device |
DE10219135B4 (en) * | 2002-04-29 | 2004-03-04 | Infineon Technologies Ag | Device and method for generating a random number |
US6714286B1 (en) | 2002-12-06 | 2004-03-30 | Itt Manufacturing Enterprises, Inc. | Agile pseudo-noise coded ranging ladar |
US7035040B2 (en) * | 2003-05-16 | 2006-04-25 | Imation Corp. | Sequenced time-based servo techniques |
US6952317B2 (en) * | 2003-06-17 | 2005-10-04 | Imation Corp. | Amplitude-based servo patterns for magnetic media |
US7038871B2 (en) * | 2003-11-10 | 2006-05-02 | Imation Corp. | Multi-band servo patterns with inherent track ID |
US7142381B2 (en) * | 2003-11-10 | 2006-11-28 | Imation Corp. | Servo writing devices for creating servo patterns with inherent track ID |
US7038872B2 (en) * | 2003-11-10 | 2006-05-02 | Imation Corp. | Servo patterns with inherent track ID |
US7095583B2 (en) * | 2004-06-02 | 2006-08-22 | Imation Corp. | Dual mode servo pattern |
JP4615904B2 (en) * | 2004-06-14 | 2011-01-19 | 富士通株式会社 | Radar equipment |
US7199958B2 (en) * | 2004-08-25 | 2007-04-03 | Imation Corp. | Servo head with varying write gap width |
US7656341B2 (en) * | 2005-02-09 | 2010-02-02 | Bryan Anthony Reeves | Noise augmented radar system |
US7466510B2 (en) * | 2005-06-03 | 2008-12-16 | Imation Corp. | Distributed servo patterns for data storage media |
US7379254B2 (en) * | 2005-06-29 | 2008-05-27 | Imation Corp. | Mixed frequency amplitude-based servo pattern |
CA2683096A1 (en) * | 2006-07-13 | 2008-01-17 | Telefonaktiebolaget L M Ericsson (Publ) | A method and radar system for coherent detection of moving objects |
US7436622B2 (en) * | 2006-07-31 | 2008-10-14 | Imation Corp. | Concurrent servo and data track writing |
US8699615B2 (en) | 2010-06-01 | 2014-04-15 | Ultra Electronics Tcs Inc. | Simultaneous communications jamming and enabling on a same frequency band |
US8600055B2 (en) * | 2010-12-17 | 2013-12-03 | Raytheon Company | Method and system using stealth noise modulation |
US8248297B1 (en) * | 2011-04-11 | 2012-08-21 | Advanced Testing Technologies, Inc. | Phase noise measurement system and method |
DE102011055674A1 (en) | 2011-11-24 | 2013-05-29 | Hella Kgaa Hueck & Co. | Method for determining at least one parameter for the correlation of two objects |
AU2016246770B2 (en) | 2015-04-08 | 2020-07-16 | Sri International | 1D phased array antenna for radar and communications |
CN105652249B (en) * | 2016-01-06 | 2018-03-13 | 河海大学 | A kind of object detection method under interference environment |
CN106371079B (en) * | 2016-08-19 | 2018-11-20 | 西安电子科技大学 | The multiple signal classification Power estimation method sharpened based on spectrum |
US10698099B2 (en) * | 2017-10-18 | 2020-06-30 | Leolabs, Inc. | Randomized phase and amplitude radar codes for space object tracking |
US10605892B2 (en) * | 2017-11-08 | 2020-03-31 | GM Global Technology Operations LLC | System and method for pseudo randomized chirp scheduling for interference avoidance |
US10921427B2 (en) | 2018-02-21 | 2021-02-16 | Leolabs, Inc. | Drone-based calibration of a phased array radar |
CN109613506B (en) * | 2018-12-21 | 2021-04-06 | 北京理工大学 | Method for detecting target echo signal of random frequency hopping repetition frequency agility radar |
US11378685B2 (en) | 2019-02-27 | 2022-07-05 | Leolabs, Inc. | Systems, devices, and methods for determining space object attitude stabilities from radar cross-section statistics |
US11500615B2 (en) | 2019-05-08 | 2022-11-15 | Discovery Semiconductors, Inc. | Programmable pseudo-random sequence generator for use with universal lidar and its associated method of operation |
US11811507B1 (en) * | 2019-06-10 | 2023-11-07 | Bae Systems Information And Electronic Systems Integration Inc. | Adaptive digital radio frequency memory for coherent response synthesis |
CN114577076B (en) * | 2022-04-07 | 2023-09-01 | 北京宏动科技股份有限公司 | Method for eliminating impulse fuse noise |
CN115291185B (en) * | 2022-10-09 | 2022-12-20 | 南京理工大学 | Parameter detection method and device for radar target and electronic equipment |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4220952A (en) * | 1956-02-17 | 1980-09-02 | The United States Of America As Represented By The Secretary Of The Navy | Random FM autocorrelation fuze system |
US3719944A (en) * | 1957-03-11 | 1973-03-06 | Us Navy | Absolute range fuze system using limiting or agc |
US3614782A (en) * | 1958-09-16 | 1971-10-19 | Us Navy | Noise-modulated fuze system |
US3906493A (en) * | 1959-03-27 | 1975-09-16 | Us Navy | Autocorrelation type spectral comparison fuze system |
GB2259820B (en) * | 1985-05-20 | 1993-08-25 | Gec Avionics | A noise radar |
NO163208C (en) * | 1986-04-09 | 1990-04-18 | Norsk Forsvarsteknologi | PROCEDURE TO INCREASE DISTANCE BETWEEN TWO DISTANCES, SPECIFICALLY AT A FIRE FIGHTING. |
US6121915A (en) * | 1997-12-03 | 2000-09-19 | Raytheon Company | Random noise automotive radar system |
US6271786B1 (en) * | 1999-06-07 | 2001-08-07 | Raytheon Company | Random noise radar target detection device |
-
1999
- 1999-06-07 US US09/326,829 patent/US6271786B1/en not_active Expired - Lifetime
-
2000
- 2000-06-06 WO PCT/US2000/015568 patent/WO2001001166A2/en active Application Filing
- 2000-06-06 AU AU79813/00A patent/AU7981300A/en not_active Abandoned
-
2001
- 2001-06-05 US US09/874,527 patent/US6392585B2/en not_active Expired - Lifetime
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060087472A1 (en) * | 2004-10-22 | 2006-04-27 | Time Domain Corporation | System and method for triggering an explosive device |
US7417582B2 (en) * | 2004-10-22 | 2008-08-26 | Time Domain Corporation | System and method for triggering an explosive device |
US20070085727A1 (en) * | 2005-10-19 | 2007-04-19 | Honeywell International Inc. | Methods and systems for leakage cancellation in radar equipped munitions |
US20090295619A1 (en) * | 2005-10-24 | 2009-12-03 | Mitsubishi Electric Corporation | Object Detection |
ITRM20130120A1 (en) * | 2013-02-28 | 2014-08-29 | Mbda italia spa | RADAR PROXIMITY SPOOL AND METHOD OF PROCESSING AN ECO RADAR SIGNAL FOR THE ACQUISITION OF DISTANCE INFORMATION BETWEEN A TARGET AND A DOPPLER RADAR |
EP2772773A1 (en) | 2013-02-28 | 2014-09-03 | MBDA ITALIA S.p.A. | Radar proximity fuse and processing method of an echo radar signal for the acquisition of distance information between a target and a Doppler radar |
US20150091748A1 (en) * | 2013-02-28 | 2015-04-02 | Mbda Italia S.P.A. | Radar proximity fuse and processing method of an echo radar signal for the acquisition of distance information between a target and a doppler radar |
CN103217670A (en) * | 2013-03-29 | 2013-07-24 | 电子科技大学 | Outer radiation source weak signal detection method based on PCA (principal component analysis) |
WO2018092232A1 (en) * | 2016-11-17 | 2018-05-24 | 三菱電機株式会社 | Radar device and control system |
JPWO2018092232A1 (en) * | 2016-11-17 | 2019-03-28 | 三菱電機株式会社 | Radar apparatus and control system |
DE112016007343B4 (en) * | 2016-11-17 | 2020-04-09 | Mitsubishi Electric Corporation | Radar device and control system |
Also Published As
Publication number | Publication date |
---|---|
WO2001001166A3 (en) | 2001-07-19 |
US6271786B1 (en) | 2001-08-07 |
WO2001001166A2 (en) | 2001-01-04 |
US6392585B2 (en) | 2002-05-21 |
AU7981300A (en) | 2001-01-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6392585B2 (en) | Random noise radar target detection device | |
US6121915A (en) | Random noise automotive radar system | |
US6420995B1 (en) | Radar and IFF system | |
US4184154A (en) | Range and angle determining Doppler radar | |
Stove et al. | Low probability of intercept radar strategies | |
US8035551B1 (en) | Noise correlation radar devices and methods for detecting targets with noise correlation radar | |
EP0893703B1 (en) | Digital bi - static spread spectrum radar | |
US4694297A (en) | Remote identification device | |
GB2259820A (en) | A noise radar | |
JPH03231184A (en) | Apparatus for reducing synchronous fruit in tcs monitoring system | |
US6639546B1 (en) | Radar system in which range ambiguity and range eclipsing are reduced by frequency diversity and alternation of pulse periodicity | |
US3175214A (en) | Doppler-free distance measuring system | |
US4072944A (en) | Imminent collision detection apparatus | |
US4155088A (en) | Dual frequency transmission apparatus for frequency-agile radar systems utilizing MTI techniques | |
CA2253235A1 (en) | Radar/sonar system concept for extended range-doppler coverage | |
US5231400A (en) | Covert electronic battlefield identification system | |
US5109231A (en) | Radar arrangement | |
Baher Safa Hanbali et al. | Countering a self-protection frequency-shifting jamming against LFM pulse compression radars | |
JPH06138215A (en) | Radar signal processing method | |
Malanowski et al. | Noise vs. deterministic waveform radar—Possibilities and limitations | |
US3258771A (en) | Radar deception jammer | |
US7298312B2 (en) | Detecting small, time domain impulsive communications signals | |
Shirude et al. | Range estimation using direct sequence spread spectrum | |
GB2059214A (en) | Range and angle determining Doppler radar | |
RU2434241C1 (en) | Jamming station |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
CC | Certificate of correction | ||
FPAY | Fee payment |
Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |