CN105577230A - Tong detection decision method for improving convergence function - Google Patents

Tong detection decision method for improving convergence function Download PDF

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Publication number
CN105577230A
CN105577230A CN201510971633.1A CN201510971633A CN105577230A CN 105577230 A CN105577230 A CN 105577230A CN 201510971633 A CN201510971633 A CN 201510971633A CN 105577230 A CN105577230 A CN 105577230A
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China
Prior art keywords
value
counting
counting variable
tong
decision method
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CN201510971633.1A
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CN105577230B (en
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唐平
韩航程
张黎
卜祥元
蒋志科
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Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7075Synchronisation aspects with code phase acquisition
    • H04B1/7077Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7075Synchronisation aspects with code phase acquisition
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7075Synchronisation aspects with code phase acquisition
    • H04B1/70754Setting of search window, i.e. range of code offsets to be searched

Abstract

The invention discloses a Tong detection decision method for improving a convergence function, which is aimed to control the searching speed through arranging a positive/negative counting stepper corresponding to a countering variable and improving a detection probability under a certain false alarm probability. The Tong detection decision method comprises steps of arranging a counting original value and an upper limit, designing a function relation between the positive/negative stepping and the counting variable, searching a time frequency unit, if the detection statistic magnitude is greater than a threshold, adding a corresponding A+to the K value, if not, subtracting a corresponding A-from the K value, and performing determination on the counting variable. The invention can design the function relation between the positive/negative counting stepper and the counting variable, coordinates the searching speed between a signal unit and a non-signal unit and improves the sensitivity of the reception machine.

Description

The Tong that convergent function improves detects decision method
Technical field
The invention belongs to wireless communication field, be specifically related to the detection decision method that a kind of Direct Sequence Spread Spectrum Signal is caught.
Background technology
The features such as direct sequence spread spectrum (DSSS:DirectSequenceSpreadSpectrum) signal has anti-multipath fading, antijamming capability is strong, transmitting power is low, intercepting and capturing rate is low, good confidentiality, are widely used in military affairs, movement and satellite communication system.The acquisition procedure of Direct Sequence Spread Spectrum Signal be time, frequently two dimensional surface is searched for signal, then detecting unit is adjudicated.Conventional judgement mode is mainly divided into two kinds of singles to detect judgement and repeated detection judgement.Under the environment that signal to noise ratio is lower, the false alarm probability detecting judgement mode due to single is higher, needs the unit to signal exists to carry out multiple authentication, namely carries out repeated detection judgement.Usual use M/N detects judgement or Tong detection decision method completes checking.The detection residence time detecting decision method due to Tong is variable, and amount of calculation is moderate, is thus used widely.
General Tong detects decision method and usually completes acquisition procedure under different environmental conditions by adjusting and arrange initial value and up threshold value.This method, for the mode of the plus-minus 1 of traditional counter variable to useful signal and unwanted signal search unit, proposes the Tong that a kind of convergent function improves and detects decision method.Carry out design closure function according to system specific works condition, counting variable carry out adding with the positive steplike function of design and negative steplike function respectively, reducing.By the search speed of control signal, improve total residence time, under certain false alarm probability, improve the detection probability of catching.
Summary of the invention
The object of this invention is to provide the Tong detection decision method that a kind of convergent function improves, for the mode of the plus-minus 1 of traditional counter variable to useful signal and unwanted signal search unit, carry out design closure function according to system specific works condition, counting variable carry out adding with the positive steplike function of design and negative steplike function respectively, reducing.By the search speed of control signal, improve total residence time, under certain false alarm probability, improve the detection probability of catching.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
The Tong that convergent function improves detects a decision method, comprises the following steps:
Step one, K represent counting variable, and M is counting initial value, and N is count upper-limit, A +for forward counting stepping, A -for negative counting stepping.Wherein, M>=0, N>=M, the value of counting variable K is predisposed to M, and each value of counting variable K corresponds to an A +value and an A -value.K and A +and K and A -corresponding relation can be write as functional form, be respectively A +=f (K) and A -=g (K), arranges corresponding functional relation under different conditions, but in order to ensure that counting variable K can converge to thresholding, two functions are necessary for nondecreasing function, and A +>=0, A ->=0.
Step 2, start to search for time frequency unit.If the test statistics of certain search unit is larger than detection threshold, check the A now corresponding to counting variable K +value, and A is added on the existing numerical value basis of K +; If test statistics is less than detection threshold, check the A now corresponding to counting variable K -value, and A is deducted on the existing numerical value basis of K -.
Step 3, detection counting variable K value size, determine whether continuing search.If K >=N, so think and successfully capture Received signal strength, this search unit is for there being signal element.If K≤0, so think that this unit is no signal unit, K=M is set and enters next search unit.If 0<K<N, so continue to detect this search unit.
The beneficial effect that the present invention reaches: this method, for the mode of the plus-minus 1 of traditional counter variable to useful signal and unwanted signal search unit, proposes the Tong that a kind of convergent function improves and detects decision method.Carry out design closure function according to system specific works condition, counting variable carry out adding with the positive steplike function of design and negative steplike function respectively, reducing.The Tong that convergent function improves detects the search speed that decision method can control time frequency unit neatly, improves total residence time, improves the detection probability of catching under certain false alarm probability, thus improves the sensitivity of system.
Accompanying drawing explanation
Fig. 1 is that the Tong that convergent function improves detects judgement search routine.
Fig. 2 be once with quadratic convergence function schematic diagram
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
The Tong that convergent function improves detects judgement search procedure as shown in Figure 1, comprises the following steps:
Step one, counting initial value M are set to 2, and count upper-limit N is set to 8.K represents counting variable, A +for forward counting stepping, A -for negative counting stepping.Setting K and A +meet quadratic function relation, be specially A +=f (K)=K 2/ 4, setting K and A -meet linear function relation, be specially A -=g (K)=K/4, as shown in Figure 2.Wherein the initial value of counting variable K is predisposed to M=2.
Step 2, start to search for time frequency unit.If the test statistics of certain search unit is larger than detection threshold, check the A now corresponding to counting variable K +value, and A is added on the existing numerical value basis of K +; If test statistics is less than detection threshold, check the A now corresponding to counting variable K -value, and A is deducted on the existing numerical value basis of K -.Concrete as K=2, if test statistics crosses detection threshold, the A that now counting variable K is corresponding +=1, so counting variable K=K+A +=3; Otherwise the A that now counting variable K is corresponding -=0.5, so counting variable K=K-A -=1.5.
Step 3, detection counting variable K value, determine whether continue search.If K >=8, so think and successfully capture Received signal strength, this search unit is for there being signal element.If K≤0, so think that this unit is no signal unit, K=M is set and enters next search unit.If 0<K<8, so continue to detect this search unit.
In sum, the beneficial effect that the present invention reaches: this method, for the mode of the plus-minus 1 of traditional counter variable to useful signal and unwanted signal search unit, proposes the Tong that a kind of convergent function improves and detects decision method.Carry out design closure function according to system specific works condition, counting variable carry out adding with the positive steplike function of design and negative steplike function respectively, reducing.The Tong that convergent function improves detects the search speed that decision method can control time frequency unit neatly, improves total residence time, improves the detection probability of catching under certain false alarm probability, thus improves the sensitivity of system.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.

Claims (4)

1. the Tong that convergent function improves detects a decision method, it is characterized in that: comprise the following steps,
Step one, K represent counting variable, and M is counting initial value, and N is count upper-limit, A +for forward counting stepping, A -for negative counting stepping.Wherein, M>=0, N>=M, the value of counting variable K is predisposed to M, and each value of counting variable K corresponds to an A +value and an A -value.
Step 2, start to search for time frequency unit.If the test statistics of certain search unit is larger than detection threshold, check the A now corresponding to counting variable K +value, and A is added on the existing numerical value basis of K +; If test statistics is less than detection threshold, check the A now corresponding to counting variable K -value, and A is deducted on the existing numerical value basis of K -.
Step 3, detection counting variable K value size, determine whether continuing search.If K >=N, so think and successfully capture Received signal strength, this search unit is for there being signal element.If K≤0, so think that this unit is no signal unit, K=M is set and enters next search unit.If 0<K<N, so continue to detect this search unit.
2. the Tong that convergent function according to claim 1 improves detects decision method, it is characterized in that in step one, each K value corresponds to an A +value and an A -value, K and A +and K and A -corresponding relation can be write as functional form, be respectively A +=f (K) and A -=g (K), can arrange identical or different functional relation under different conditions, but in order to ensure that counting variable K can converge to thresholding, two functions are necessary for nondecreasing function, and A +>=0, A ->=0.
3. the Tong that convergent function according to claim 1 improves detects decision method, if it is characterized in that in step 2, the test statistics of certain search unit is larger than detection threshold, so on K existing numerical value basis, adds corresponding A +value; If test statistics is less than detection threshold, so deducts on K existing numerical value basis and add corresponding A -.
4. the Tong that convergent function according to claim 1 improves detects decision method, it is characterized in that the judgment condition in step 3.Due to the particularity of positive and negative steplike function, nonnegative function value A +and A -differ and be decided to be integer, therefore counting variable K also differs and is decided to be integer.For the traversal whole circumstances when adjudicating, judgement three kinds of situations are needed to be respectively K >=N, K≤0 and 0<K<N.
CN201510971633.1A 2015-12-22 2015-12-22 The improved Tong detections decision method of convergent function Expired - Fee Related CN105577230B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109547129A (en) * 2018-11-27 2019-03-29 中国科学院光电研究院 A kind of stepping Weighted T ong detection method
CN113109846A (en) * 2021-03-04 2021-07-13 北京北方联星科技有限公司 Capture verification strategy method based on signal intensity trend

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US5347284A (en) * 1991-02-28 1994-09-13 Texas Instruments Incorporated System and method for a digital navigation satellite receiver
CN103995267A (en) * 2014-06-06 2014-08-20 内蒙古科技大学 Method for judging satellite navigation anti-interference threshold value based on improved Tang detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5347284A (en) * 1991-02-28 1994-09-13 Texas Instruments Incorporated System and method for a digital navigation satellite receiver
CN103995267A (en) * 2014-06-06 2014-08-20 内蒙古科技大学 Method for judging satellite navigation anti-interference threshold value based on improved Tang detector

Non-Patent Citations (1)

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Title
朱云龙等: "Tong检测算法性能分析及参数设置", 《北京航空航天大学学报》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109547129A (en) * 2018-11-27 2019-03-29 中国科学院光电研究院 A kind of stepping Weighted T ong detection method
CN109547129B (en) * 2018-11-27 2021-09-24 中国科学院光电研究院 Stepping weighting Tong detection method
CN113109846A (en) * 2021-03-04 2021-07-13 北京北方联星科技有限公司 Capture verification strategy method based on signal intensity trend

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