CN106685477A - Different address interference resistance DSSS signal acquisition method based on detection and reinforcement and receiver - Google Patents
Different address interference resistance DSSS signal acquisition method based on detection and reinforcement and receiver Download PDFInfo
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Abstract
The invention discloses a different address interference resistance DSSS signal acquisition method based on detection and reinforcement and a receiver. By using the method and the receiver, an adverse effect brought by a target signal address code autocorrelation sidelobe can be weakened and further increase of capturing performance under different address interference is realized. In the invention, a target signal address code autocorrelation characteristic is fully used, and a correlation result of a receiving signal and a local signal at a low sidelobe position of an autocorrelation result is selected to assist a correlation peak value to construct a decision amount so that the adverse effect brought by the target signal address code autocorrelation sidelobe can be weakened and the further increase of the capturing performance under the different address interference is realized. By using the method of the invention, an anti-interference capability of a capturing unit can be increased, detection performance of the capturing unit is improved and receiver sensitivity is increased. Besides, compared to a common primary and secondary ratio detection capturing method, by using the method of the invention, a mean value calculating module and a sidelobe address generation module are only increased so that resource consumption increase is less.
Description
Technical field
The present invention relates to space flight signal capture technical field, and in particular to a kind of anti-different location interference reinforced based on detection is directly
Connect sequence spread spectrum signal catching method and signal receiver.
Background technology
DSSS (DSSS) signal has the advantages that anti-intercepting and capturing and strong antijamming capability, it is possible to achieve code division is more
Location, is widely used in the fields such as Space TT＆C, satellite navigation and communication.Receiving terminal using each user distribution address code it
Between correlation properties, realize the detection synchronization of echo signal.Consider not ideal quadrature between address code, DSSS receivers can not
Can be affected by other users address code with avoiding, the phenomenon of different location interference occurred.Especially under the scene of strong different location interference,
The acquisition performance of echo signal deteriorates seriously, or even the normal work that can affect receiver.Accordingly, it would be desirable to study anti-different location interference
Catching method.
The catching method of conventional anti-different location interference is divided three classes：Based on the catching method of interference reconstruct elimination, based on dry
The catching method for disturbing adaptive-filtering and the catching method reinforced based on detection.
The catching method eliminated based on interference reconstruct and the catching method filtered based on interference adaptive, are required to all different
Location is disturbed and the address code of echo signal is prior information.Wherein, interference reconstruct is eliminated is realized by multistage interference cancellation,
Rear class carries out interference reconstruct according to prime data decision result, and then offsets in signal from receiving, therefore the mistake of front DBMS
Adjudicate the correctness synchronous by rear class signal detection is had a strong impact on.Interference adaptive filtering method is according to the interference of different location and target letter
Number cross-correlation function and error function filter coefficient is set, and filtering for interference signal is realized by successive ignition, should
Method implementation complexity is high, poor real.
It is that on the basis of conventional catching method, just detection judging module is improved that detection is reinforced.The method can be with
Improve the capacity of resisting disturbance of capture to a certain extent, and do not need the address code information of different location interference as prior information, no
The modules such as follow-up tracking, data demodulation are depended on, realizes that simply real-time is good.In Journal of Systems in 2011
What page 157 to page 163 of volume 1 of the 22nd phases of Engineering and Electronics were delivered by Yongqing Wang et al.
“New acquisition decision algorithm for multiple access interference
In a suppression in DSSS system " texts, to receive the maximum of signal and local address code correlated results absolute value
Value and second largest value ratio propose a kind of detection decision algorithm based on primary and secondary ratio as judgement amount.Empirical tests the method can have
Improve the interference free performance caught in effect ground.But the method builds judgement amount using secondary peak as secondary lobe datum, and secondary peak is located at
The probability of higher echo signal address code auto-correlation function secondary lobe position is larger, and it is higher to be affected by secondary lobe datum, signal
Capture existing defects.
The content of the invention
In view of this, the invention provides a kind of anti-different location Interference Resistant DS Spread Spectrum signal capture reinforced based on detection
Method and signal receiver, can weaken the adverse effect that echo signal address code autocorrelation sidelobe brings, and realize different location interference
The further raising of lower acquisition performance.
The anti-different location Interference Resistant DS Spread Spectrum signal acquisition methods reinforced based on detection of the present invention, including following step
Suddenly：
Step 1, generates the address code of local carrier and signal to be captured；
Step 2, the local carrier generated using step 1 and the address code docking collection of letters number carry out relevant treatment, obtain related
As a result x；
Step 3, carries out selecting big to correlated results, obtains correlation peak V and its corresponding correlation peak location I；
Step 4, to address code autocorrelation sidelobe level ascending sequence is carried out, and chooses first more than 1 from sequence
Correlated results x values on address code autocorrelation sidelobe level correspondence position are counted, with sample as sample to the level of sample
This level statistics value is used as secondary lobe datum mx；(because echo signal address code is set in system design, with reality
Receive signal unrelated, therefore address code auto-correlation can be precalculated)
Step 5, calculates decision statistics Z：Z=V/mx；
Step 6, is made decisions using decision statistics Z with the CFAR thresholding of setting, when decision statistics Z exceedes door
Limit, represents acquisition success, and the correlation peak location I obtained by step 3 calculates Doppler frequency and pseudorandom codes phase estimation result, and
Output is used as capture result；Otherwise capture failure, restarts capture.
Further, in the step 4, sample level statistics value is the average or variance or standard deviation of sample level.
Present invention also offers a kind of signal receiver, the capturing unit of the signal receiver is including local carrier and ground
Location code generation module, correlation module, select big module, mean value computation module, judgement amount computing module and detection judging module；
Wherein, the local carrier is used to generate local carrier and address code with address code generation module, and will locally carry
Ripple and address code are exported to correlation module；
Using local carrier and address code, docking is collected mail number carries out relevant treatment to the correlation module, and by correlated results x
Export to selecting big module and mean value computation module；
It is described to select big module to carry out selecting big to the modulus value or mould square value of correlated results, obtain correlation peak V and relevant peaks
Position I, and correlation peak V is exported give judgement amount computing module, correlation peak location I is exported to mean value computation module and detection
Judging module；
The mean value computation module is according to the correlation module correlated results for exporting and the correlation peak location for selecting big module output
I, counts to the level value of previously selected sample, and the average or variance or standard deviation using sample is used as secondary lobe datum
mx, and by secondary lobe datum mxExport and give judgement amount computing module；Wherein, the sample can be previously according to address code auto-correlation
As a result select, specifically, ascending sequence carried out to address code autocorrelation sidelobe level, from sequence choose it is front 1 with
Correlated results x values on upper address code autocorrelation sidelobe level correspondence position are used as sample；
The judgement amount computing module is with correlation peak V and secondary lobe datum mxBe used for decision statistics Z, and will
Decision statistics Z is exported and is given detection judging module；
It is described to detect judging module by decision statistics Z and default CFAR thresholding VTIt is compared, if decision statistics Z
More than thresholding, then acquisition success, by the correlation peak location I for selecting big module output Doppler frequency and pseudorandom codes phase estimation are calculated
As a result, and export as capture result；Otherwise capture failure, restarts capture.
Further, also including secondary lobe address generating module and Logic control module；
Wherein, the preset Doppler frequency search value of the Logic control module, calculates local carrier frequency control word and ground
Location code frequency control word, exports to local carrier and address code generation module；
The local carrier frequency control word that local carrier is exported with address code generation module according to Logic control module, generates
Local carrier, exports to correlation module；According to the address code frequency control word of Logic control module output, local bit rate is corrected
fc, obtain revised local bit rate fc', according to revised local bit rate fc' address code is produced, and address code is defeated
Go out to correlation module, while by revised local bit rate fc' export and give secondary lobe address generating module；
The correlation module is according to carrier wave and the local carrier and address code of the output of address code generation module, the docking collection of letters number
Relevant treatment is carried out, output correlated results x (i), wherein i=0,1,2 ..., Ns-1, i are search code phase label, and Ns is code-phase
The total number of searches of position dimension, Ns=T × fs, wherein T be the address code cycle, fsFor sample rate；And correlated results is exported to average meter
Calculate module and select big module；
Select big module to export from correlation module choose in correlated results maximum as correlation peak V and record what it was located
Position I, the correlation peak V is exported and gives judgement amount computing module, correlation peak location I export to secondary lobe address generating module and
Logic control module；
Look-up table is provided with secondary lobe address generating module, look-up table length is the address code cycle；Respectively post in the look-up table
The address correspondence code address autocorrelation result secondary lobe position of memory cell, and post the position of previously selected sample is corresponding
The value of memory cell is set to 1, and the value of the corresponding deposit unit of other positions is set to 0；Wherein, the sample can be previously according to ground
Location code autocorrelation result is selected, and specifically, to address code autocorrelation sidelobe level ascending sequence is carried out, and is selected from sequence
The correlated results x values on front more than 1 address code autocorrelation sidelobe level correspondence position are taken as sample.
Secondary lobe address generating module is according to local carrier and the revised local bit rate of address code generation module output
fc', calculate frequency control word Fw=fc′/fs；Address accumulator initial value in secondary lobe address generating module is set to 0, with frequency control
Word F processedwIt is cumulative for stepping, produce look-up table and read address P (j), j=0,1,2 ..., Ns-1 read from look-up table read ground successively
The value of the look-up table deposit unit corresponding to location P (j), is designated as En (j), j=0,1,2 ..., Ns-1；P (j) is superimposed to into correlation
Secondary lobe address P ' (j) is obtained on the I of peak position, is together exported with En (j) and is given mean value computation module；Wherein, P ' (j)=mod { I+P
(j), Ns }, mod represents that remainder is operated；
Correlated results x (i) that correlation module is exported is stored in depositor by mean value computation module；Receive secondary lobe address simultaneously to produce
The P ' (j) of raw module output, correlated results x (P ' (j)) is read using P ' (j) as address from depositor, calculates all En (j)
Average m of correspondence x (P ' (j)) when=1x, thenExport and calculate mould to judgement amount
Block；
Judgement amount computing module is calculated and exported after detection judgement amount to detection judging module；Detection judging module sentences detection
Certainly amount compares with the CFAR thresholding of setting, if detection judgement amount is more than thresholding, marking signal flag is set to into 1, otherwise is
0；Marking signal flag is exported to Logic control module；
Logic control module receives marking signal flag and correlation peak location I；As flag=0, it is believed that under current frequency
Echo signal is not present, and changes current search frequency, and next search frequency is sent to local carrier and address code generation module；
As flag=1, judge that echo signal is present, acquisition success, by current search frequencyWith peak I respectively as how general
Frequency and address phase acquisition result output are strangled, capture is completed.
Beneficial effect：
Compared with based on interference reconstruct elimination, the catching method of interference adaptive filtering, the present invention is added solid based on detection
Now resist different location to disturb, therefore the address code sequence of different location interference signal need not be predicted, and implementation complexity is low, resource consumption
Little, real-time is high.
Compared with catching method is reinforced in the detection based on primary and secondary ratio, the present invention takes full advantage of echo signal address code from phase
Characteristic is closed, the relatively low secondary lobe auxiliary correlation peak of autocorrelation result is chosen and is built judgement amount, weaken echo signal address code from phase
The adverse effect that secondary lobe brings is closed, the further raising of the lower acquisition performance of different location interference is realized, is embodied in：In Acquisition Detection
Under the conditions of performance, signal to noise ratio identical, the jamming power that the inventive method can be tolerated is higher, and signal to noise ratio is lower, to tolerance
The lifting of jamming power tolerance is more obvious, shows that the inventive method can effectively lift receiver and resist different location interference performance；
Under the conditions of dry ratio of making an uproar, signal to noise ratio, false-alarm probability identical, the detection probability of the present invention increases, and with signal to noise ratio
Reduce, detection probability improvement becomes apparent from, illustrate that the inventive method has changed to Acquisition Detection Performance in the case where different location is disturbed
It is kind；Identical Acquisition Detection Performance and it is identical it is dry make an uproar than under conditions of, the inventive method require snr of received signal more
It is low, illustrate that the inventive method can lift receiver sensitivity in the case where different location is disturbed.In addition, compare conventional primary and secondary catching than detection
The resource consumption of method is obtained, the resource consumption that the mean value computation module increased in the inventive method and secondary lobe address produce increases
It is very little.
Description of the drawings
Fig. 1 is the Gold codes auto-correlation function and its statistical property of certain code length 1023.(a) certain address code auto-correlation function；
The statistical result of (b) auto-correlation function.
Fig. 2 is mean value computation module sequential chart.
Fig. 3 is that the present invention receives machine frame based on the anti-different location Interference Resistant DS Spread Spectrum signal acquisition methods that detection is reinforced
Figure.
Fig. 4 is that the present invention considers Doppler based on the anti-different location Interference Resistant DS Spread Spectrum signal acquisition methods that detection is reinforced
Receiver realizes block diagram during the practical situations such as multi-code velocity impact.
Specific embodiment
Develop simultaneously below in conjunction with the accompanying drawings embodiment, describes the present invention.
The invention provides a kind of anti-different location Interference Resistant DS Spread Spectrum signal acquisition methods reinforced based on detection, to base
It is improved in the detection decision algorithm of primary and secondary ratio, distribution character (the echo signal ground of echo signal address code auto-correlation function
Larger compared with the proportion that low sidelobe number accounts for total correlation points in the code auto-correlation function of location, sample size is more, and to correlation side lobes electricity
Flat impact is little), in minimum autocorrelation sidelobe position the correlated results for receiving signal and local signal is counted as correlation side lobes
Datum, and then judgement amount is built with reference to relevant peaks, realize the reduction of correlation side lobes level.Further, the judgement amount is carried out
Detection judgement, the detection for realizing capture is reinforced, to lift the lower acquisition performance of different location interference.
Local signal and auto-correlation, local signal comprising local signal with echo signal in the correlated results for receiving signal
With the interference of different location and the cross-correlation of noise.Wherein local signal knows with echo signal auto-correlation function, and auto-correlation is tied
Fruit secondary lobe is not 0.By taking the Gold codes commonly used as an example, autocorrelation sidelobe level has dividing for height, as shown in Figure 1.Generally, it is related
As a result the peak value of absolute value is higher and sidelobe level is lower, and Acquisition Detection Performance is better.Primary and secondary than judgement amount, using secondary peak as side
Lobe datum, and secondary peak be located at higher auto-correlation function secondary lobe position probability it is larger, be affected by secondary lobe datum compared with
Height, remains to be further improved.
The present invention builds judgement using the distribution character of the auto-correlation function according to the relatively low secondary lobe datum of statistics
Amount.
Implement step as follows：
Step one：Generate the address code of local carrier and signal to be captured.
Step 2：Relevant treatment is carried out using local carrier and the address code docking collection of letters number, correlated results is obtained.
Step 3：Correlated results is carried out to select big, correlation peak V and its corresponding correlation peak location I is obtained.
Step 4：In known address code autocorrelation result, in addition to a main peak, remaining is secondary lobe, wherein,
Sidelobe level has dividing for height；Ascending sequence is carried out to address code autocorrelation sidelobe level, chooses first 1 from sequence
, used as sample, number of samples is more, statistic property for correlated results x values on above address code autocorrelation sidelobe level correspondence position
It is better but computation complexity is also higher；Sample level is counted (average, variance or standard deviation may be selected as statistic),
Using sample level statistics value as secondary lobe datum mx。
Step 5：The datum m that the correlation peak V obtained by step 3 and step 4 are obtainedx, calculate decision statistics
Z (Z=V/mx)。
Step 6：Made decisions with the CFAR thresholding of setting according to decision statistics Z, when decision statistics exceed door
Limit, then acquisition success, by the correlation peak location of step 3 acquisition Doppler frequency and pseudorandom codes phase estimation result are calculated, and defeated
Go out as capture result；Otherwise capture failure, restarts capture.
Present invention also offers a kind of signal receiver, the capturing unit of the receiver includes：Local carrier and address
Code generation module, correlation module, select big module, mean value computation module, judgement amount computing module and detection judging module, such as Fig. 3
It is shown.The system can be described as follows.
(1) local carrier generates local carrier and address code with address code generation module, exports to correlation module.
(2) correlation module receives local carrier and address code, and with signal is received relevant treatment is carried out, export correlated results to
Select big module and mean value computation module.
(3) select big module to receive correlated results, the modulus value (or mould square value) of correlated results is carried out selecting big, obtain related
Peak value V and its corresponding correlation peak location I, correlation peak V is exported and is calculated to judgement amount, and correlation peak location I is exported to inspection
Survey judging module and mean value computation module.
(4) mean value computation module receives correlated results and peak, and the level value of previously selected sample is united
Meter, (number of samples is more, and statistic property is better but computation complexity is also higher).According to the statistical result that gained sample is calculated
(average, variance or standard deviation), the statistical result is secondary lobe datum mx, by secondary lobe datum mxExport to judgement
Amount computing module.Wherein, the sample can be selected previously according to address code autocorrelation result, specifically, to address code auto-correlation
Sidelobe level carries out ascending sequence, and front more than 1 address code autocorrelation sidelobe level correspondence position is chosen from sequence
On correlated results x values as sample.
(5) judgement amount computing module receives correlation peak V and secondary lobe datum mx, do than obtaining decision statistics Z, it is defeated
Go out and give detection judging module.
(6) detect that judging module receives decision statistics Z, with default CFAR thresholding VTRelatively, if detection statistic is super
Thresholding is crossed, then acquisition success, Doppler frequency and pseudorandom codes phase estimation result are calculated by the correlation peak location I for receiving, and it is defeated
Go out as capture result；Otherwise capture failure, restarts capture.
Consider the practical factors such as impact of the Doppler to pseudo- bit rate, (without loss of generality, here design is implemented as described below scheme
Correlated results is corresponded to as sample, carry out equal Data-Statistics to it is as secondary lobe datum so that selection is all compared with low sidelobe position
Example).
This programme includes：Peak value selects big, secondary lobe address generation, mean value computation, judgement amount to calculate.It is described to resist different location disturber
The system that method is adopted includes Logic control module, local carrier and address code generation module, correlation module and detection judgement mould
Block.Comprise steps that：
(1) arrange that peak value choosing is big, secondary lobe address produces, mean value computation and judgement amount computing module, the big module of the choosing with
Correlation module, secondary lobe address generating module, judgement amount computing module are connected with Logic control module, and the secondary lobe address produces mould
Block is connected with mean value computation module, local carrier with address code generation module, the mean value computation module and correlation module and sentences
Computing module is certainly measured, the judgement amount computing module is also connected with detection judging module.
(2) secondary lobe address generating module is provided with look-up table, and its length is the address code cycle.Each storage receipt in the look-up table
The address correspondence code address autocorrelation result secondary lobe position of unit, and by the corresponding storage receipt in the position of previously selected sample
The value of unit is set to 1, and the value of the corresponding deposit unit of other positions is set to 0.Wherein, the sample can be previously according to address code
Autocorrelation result is selected, and specifically, to address code autocorrelation sidelobe level ascending sequence is carried out, before choosing from sequence
Correlated results x values on more than 1 address code autocorrelation sidelobe level correspondence position are used as sample.
By taking the Gold codes that certain length is 1023 as an example, its auto-correlation function absolute value | R (τ) | is as shown in Figure 1.It can be seen that from phase
Closing function mainly has three kinds of values：1. auto-correlation main lobe, is highly 1023；2. higher secondary lobe, is highly 65 or 63, shared percentage
Than being about 25%；3. it is highly 1 compared with low sidelobe, percentage is about 75%.If using this Gold code as echo signal ground
Location code, chooses situation correlated results x values 3. on correspondence position as sample, then corresponding situation address 1. and 2. in look-up table
Place's data are set to 0, and data are set to 1 at correspondence situation address 3..
(3) Logic control module calculates local carrier frequency control word and ground according to preset Doppler frequency search value
Location code frequency control word, exports to local carrier and address code generation module.
(4) the local carrier frequency control word that local carrier is exported with address code generation module according to Logic control module,
Local carrier is generated, is exported to correlation module；According to the address code frequency control word of Logic control module output, local code is corrected
Speed fc, obtain revised local bit rate fc', and produce address code and export to correlation module, while by fc' export to side
Lobe address generating module.
Wherein,For current search Doppler frequency, f0For rf frequency.
(5) correlation module is according to carrier wave and the local carrier and address code of the output of address code generation module, the docking collection of letters number
Relevant treatment, output correlated results x (i) are carried out, i=0,1,2 ..., Ns-1, wherein i are search code phase label, and Ns is always to search
Rope number, usual Ns=T × fs, wherein T be the address code cycle, fsFor sample rate.Correlated results is exported to mean value computation module
With select big module.
(6) select big module to receive correlation module output correlated results x, choose x maximum is as correlation peak V and records
Its position I being located, the correlation peak V is exported and gives judgement amount computing module, and correlation peak location I is exported and produced to secondary lobe address
Raw module and Logic control module.
(7) secondary lobe address generating module is used to generate in address code autocorrelation result compared with low sidelobe position.Secondary lobe ground
Location generation module receives revised pseudo- bit rate f of Dopplerc', calculate frequency control word Fw=fc′/fs.Secondary lobe address produces
Address accumulator initial value in module is set to 0, with frequency control word FwIt is cumulative for stepping, produce look-up table and read address P (j), j=
0,1,2 ..., Ns-1, read successively the value of the look-up table deposit unit corresponding to address P (j) from look-up table, are designated as En
(j), j=0,1,2 ..., Ns-1.P (j) is superimposed on correlation peak location I and obtains secondary lobe address P ' (j), it is together defeated with En (j)
Go out and give mean value computation module (sequential relationship is as shown in Figure 2).Wherein, P ' (j)=mod { I+P (j), Ns }, mod represent that remainder is grasped
Make.
(8) mean value computation module receives correlated results x (i), in being stored in depositor.Secondary lobe address generating module is received simultaneously
The P ' (j) of output, correlated results x (P ' (j)) is read using P ' (j) as address from depositor, when calculating all En (j)=1
Average m of correspondence x (P ' (j))x, thenExport and give judgement amount computing module.
(9) judgement amount computing module is connect according to correlation peak V and average mx, calculate detection judgement amount Z=V/mxExport to inspection
Survey judging module.
(10) detect that judging module receives Z, and by itself and default CFAR thresholding VTRelatively, if Z is more than thresholding, will mark
Will signal flag is set to 1, otherwise for 0, and marking signal flag is exported to Logic control module.
Because channel circumstance is unknown, in order to meet CFAR criterion, need to calculate different channels environment (pure noise ring respectively
Border and different degrees of interference environment) under false-alarm probability be PFAWhen corresponding thresholding, select maximum therein as final
Detection decision threshold (is set to VT)。
(11) Logic control module receives marking signal flag and correlation peak location I.As flag=0, then it is assumed that current
Echo signal is not present under frequency, changes current search frequency, and returning to step (3) carries out the search of next frequency (if completing institute
There is frequency to search for, then return to the first frequency and restart)；As flag=1, judge that echo signal is present, acquisition success, and will
Current search frequencyWith peak I respectively as Doppler frequency and address phase acquisition result output, capture is completed
Process.
In sum, presently preferred embodiments of the present invention is these are only, is not intended to limit protection scope of the present invention.
All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in the present invention's
Within protection domain.
Claims (4)
1. it is a kind of based on detection reinforce anti-different location Interference Resistant DS Spread Spectrum signal acquisition methods, it is characterised in that include as
Lower step：
Step 1, generates the address code of local carrier and signal to be captured；
Step 2, the local carrier generated using step 1 and the address code docking collection of letters number carry out relevant treatment, obtain correlated results
x；
Step 3, carries out selecting big to correlated results, obtains correlation peak V and its corresponding correlation peak location I；
Step 4, to address code autocorrelation sidelobe level ascending sequence is carried out, and front more than 1 address is chosen from sequence
Correlated results x values on code autocorrelation sidelobe level correspondence position are counted as sample to the level of sample, with sample electricity
Flat statistical value is used as secondary lobe datum mx；
Step 5, calculates decision statistics Z：Z=V/mx；
Step 6, is made decisions using decision statistics Z with the CFAR thresholding of setting, when decision statistics Z exceedes thresholding, table
Show acquisition success, the correlation peak location I obtained by step 3 calculates Doppler frequency and pseudorandom codes phase estimation result, and exports
As capture result；Otherwise capture failure, restarts capture.
2. as claimed in claim 1 based on the anti-different location Interference Resistant DS Spread Spectrum signal acquisition methods for detecting reinforcing, it is special
Levy and be, in the step 4, the sample level statistics value is the average or variance or standard deviation of sample level.
3. a kind of signal receiver, it is characterised in that the capturing unit of the signal receiver includes local carrier and address code
Generation module, correlation module, select big module, mean value computation module, judgement amount computing module and detection judging module；
Wherein, the local carrier and address code generation module are used to generating local carrier and address code, and by local carrier and
Address code is exported to correlation module；
Using local carrier and address code, the docking collection of letters number carries out relevant treatment to the correlation module, and correlated results is exported
To selecting big module and mean value computation module；
It is described to select big module to carry out selecting big to the modulus value or mould square value of correlated results, obtain correlation peak V and correlation peak location
I, and correlation peak V is exported give judgement amount computing module, correlation peak location I is exported to mean value computation module and detection judgement
Module；
The mean value computation module is right according to the correlation module correlated results for exporting and the correlation peak location I for selecting big module output
The level value of selected sample is counted, using the average or variance or standard deviation of sample as secondary lobe datum mx, and by side
Lobe datum mxExport and give judgement amount computing module；Wherein, the sample method for selecting is：To address code autocorrelation sidelobe electricity
It is flat to carry out ascending sequence, the phase on front more than 1 address code autocorrelation sidelobe level correspondence position is chosen from sequence
Result x value is closed as sample；
The judgement amount computing module is with correlation peak V and secondary lobe datum mxBe used for decision statistics Z, and will judgement
Statistic Z is exported gives detection judging module；
It is described to detect judging module by decision statistics Z and default CFAR thresholding VTIt is compared, if decision statistics Z exceedes
Thresholding, then acquisition success, by the correlation peak location I for selecting big module output Doppler frequency and pseudorandom codes phase estimation knot are calculated
Really, and export as capture result；Otherwise capture failure, restarts capture.
4. signal receiver as claimed in claim 3, it is characterised in that also including secondary lobe address generating module and logic control
Module；
Wherein, the preset Doppler frequency search value of the Logic control module, calculates local carrier frequency control word and address code
Frequency control word, exports to local carrier and address code generation module；
The local carrier frequency control word that local carrier is exported with address code generation module according to Logic control module, generates local
Carrier wave, exports to correlation module；According to the address code frequency control word of Logic control module output, local bit rate f is correctedc,
Obtain revised local bit rate fc', according to revised local bit rate fc' produce address code, and by address code export to
Correlation module, while by revised local bit rate fc' export and give secondary lobe address generating module；
The correlation module is carried out according to carrier wave and the local carrier and address code of the output of address code generation module, the docking collection of letters number
Relevant treatment, output correlated results x (i), wherein i=0,1,2 ..., Ns-1, i are search code phase label, and Ns is code phase dimension
Total number of searches, Ns=T × fs, wherein T be the address code cycle, fsFor sample rate；And correlated results is exported to mean value computation mould
Block and select big module；
Select big module that the position that maximum is chosen in correlated results as correlation peak V and its place is recorded is exported from correlation module
I, the correlation peak V is exported and gives judgement amount computing module, and correlation peak location I is exported to secondary lobe address generating module and logic
Control module；
Look-up table is provided with secondary lobe address generating module, look-up table length is the address code cycle；Each storage receipt in the look-up table
The address correspondence code address autocorrelation result secondary lobe position of unit, and by the value of the corresponding deposit unit in the position of selected sample
1 is set to, the value of the corresponding deposit unit of other positions is set to 0；Wherein, the sample method for selecting is：To address code certainly
Correlation side lobes level carries out ascending sequence, and front more than 1 address code autocorrelation sidelobe level correspondence is chosen from sequence
Correlated results x values on position are used as sample；
Secondary lobe address generating module is according to local carrier and revised local bit rate f of address code generation module outputc', meter
Calculate frequency control word Fw=fc′/fs；Address accumulator initial value in secondary lobe address generating module is set to 0, with frequency control word Fw
It is cumulative for stepping, produce look-up table and read address P (j), j=0,1,2 ..., Ns-1 read from look-up table read address P (j) successively
The value of corresponding look-up table deposit unit, is designated as En (j), j=0,1,2 ..., Ns-1；P (j) is superimposed to into correlation peak location I
Upper acquisition secondary lobe address P ' (j), together exports with En (j) and gives mean value computation module；Wherein, P ' (j)=mod { I+P (j), Ns },
Mod represents that remainder is operated；
Correlated results x (i) that correlation module is exported is stored in depositor by mean value computation module；Secondary lobe address is received simultaneously produces mould
The P ' (j) of block output, correlated results x (P ' (j)) is read using P ' (j) as address from depositor, calculates all En (j)=1
When correspondence x (P ' (j)) average mx, thenExport and give judgement amount computing module；
Judgement amount computing module is calculated and exported after detection judgement amount to detection judging module；Detection judging module will detect judgement amount
Compare with the CFAR thresholding of setting, if detection judgement amount is more than thresholding, marking signal flag is set to into 1, otherwise for 0；Will
Marking signal flag is exported to Logic control module；
Logic control module receives marking signal flag and correlation peak location I；As flag=0, it is believed that target under current frequency
Signal is not present, and changes current search frequency, and next search frequency is sent to local carrier and address code generation module；When
During flag=1, judge that echo signal is present, acquisition success, by current search frequencyWith peak I respectively as Doppler
Frequency and address phase acquisition result output, complete capture.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802719A (en) * | 2018-06-04 | 2018-11-13 | 北京理工大学 | The DSSS that cascading judgement is constrained based on thresholding and multiple spot neighbour detects decision method |
| CN110381005A (en) * | 2019-09-06 | 2019-10-25 | 成都博高信息技术股份有限公司 | Detection method, device, equipment and the medium of power line communication leading character relevant peaks |
| CN115097500A (en) * | 2022-08-24 | 2022-09-23 | 中国人民解放军国防科技大学 | Variable step length satellite navigation receiver signal correlation peak acquisition method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0756387A2 (en) * | 1995-07-25 | 1997-01-29 | Nokia Mobile Phones Ltd. | Serial acquisition system with adaptive threshold and optimal decision for spread spectrum systems |
| US7406115B2 (en) * | 2004-03-08 | 2008-07-29 | Fujitsu Ten Limited | Method for evaluating spread spectrum radar and spread spectrum radar |
| CN102662183A (en) * | 2012-04-27 | 2012-09-12 | 桂林电子科技大学 | Method and system for global position system (GPS) signal capture |
| CN106168671A (en) * | 2016-07-12 | 2016-11-30 | 北京理工大学 | DSSS receiver based on open loop adaptive-filtering resists different location interference method |
-
2016
- 2016-12-12 CN CN201611140083.XA patent/CN106685477B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0756387A2 (en) * | 1995-07-25 | 1997-01-29 | Nokia Mobile Phones Ltd. | Serial acquisition system with adaptive threshold and optimal decision for spread spectrum systems |
| US7406115B2 (en) * | 2004-03-08 | 2008-07-29 | Fujitsu Ten Limited | Method for evaluating spread spectrum radar and spread spectrum radar |
| CN102662183A (en) * | 2012-04-27 | 2012-09-12 | 桂林电子科技大学 | Method and system for global position system (GPS) signal capture |
| CN106168671A (en) * | 2016-07-12 | 2016-11-30 | 北京理工大学 | DSSS receiver based on open loop adaptive-filtering resists different location interference method |
Non-Patent Citations (1)
| Title |
|---|
| 吴玉成: "DSSS系统PN码捕获的相关峰优化及自适应门限检测", 《电路与系统学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802719A (en) * | 2018-06-04 | 2018-11-13 | 北京理工大学 | The DSSS that cascading judgement is constrained based on thresholding and multiple spot neighbour detects decision method |
| CN110381005A (en) * | 2019-09-06 | 2019-10-25 | 成都博高信息技术股份有限公司 | Detection method, device, equipment and the medium of power line communication leading character relevant peaks |
| CN110381005B (en) * | 2019-09-06 | 2022-06-17 | 成都博高信息技术股份有限公司 | Method, device, equipment and medium for detecting correlation peak of preamble in power line communication |
| CN115097500A (en) * | 2022-08-24 | 2022-09-23 | 中国人民解放军国防科技大学 | Variable step length satellite navigation receiver signal correlation peak acquisition method |
| CN115097500B (en) * | 2022-08-24 | 2022-11-04 | 中国人民解放军国防科技大学 | Variable step length satellite navigation receiver signal correlation peak acquisition method |
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