CN109474307A - Non-coherent spread-spectrum signal quick capturing method - Google Patents
Non-coherent spread-spectrum signal quick capturing method Download PDFInfo
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- CN109474307A CN109474307A CN201811429706.4A CN201811429706A CN109474307A CN 109474307 A CN109474307 A CN 109474307A CN 201811429706 A CN201811429706 A CN 201811429706A CN 109474307 A CN109474307 A CN 109474307A
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- 238000001228 spectrum Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001427 coherent effect Effects 0.000 claims abstract description 52
- 230000010354 integration Effects 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 238000012952 Resampling Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 10
- 238000013500 data storage Methods 0.000 claims description 8
- 210000000352 storage cell Anatomy 0.000 claims description 7
- 238000009825 accumulation Methods 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details 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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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Abstract
A kind of non-coherent spread-spectrum signal quick capturing method disclosed by the invention, to realize the quick accurate capture to spread spectrum code phase and Doppler.The technical scheme is that: in spread spectrum receiver system, pn code generator generates local spread spectrum code sequence, it is sent into parallel processing element and carries out multidiameter delay processing, slot control information progress frequency is divided to divide slot according to what main control unit was sent, carrier doppler is compensated, matched filtering is successively carried out again, coherent integration, zero padding FFT and non-coherent integration, then various dimensions peak value searching is carried out to multiple tributary signals, obtain phase capturing result and carrier frequency rough estimate result, and the phase capturing result of acquisition and carrier frequency rough estimate result are sent into main control unit, selection control information is sent into branch selecting unit by main control unit, selection receives the signal all the way of signal and local spread spectrum code sequence phase alignment, it is output to smart frequency senser, estimate the carrier frequency for receiving signal.
Description
Technical field
The present invention relates in a kind of capture technique of wireless communication field more particularly to a kind of band spread receiver, to non-phase
The method that the pseudo-code phase and carrier frequency of the spread-spectrum signal of ginseng are captured.
Background technique
The advantage that spread spectrum communication system has many other communication systems incomparable, but obtaining these advantages is to have premise
, that is, normal solution must be can be realized in receiving end and extend to demodulation.Despreading has two kinds of sides of coherently despreading and irrelevant despreading
Formula usually all uses coherently despreading in communication system.It realizes that coherently despreading and demodulation must be realized first to expand reception signal
The accurate estimation of frequency code phase and code Doppler.Code Doppler frequency shift r is made of two parts: a part is transmitting terminal and receives
Code Doppler frequency shift r caused by relative motion between end1, another part is quasi- using crystal oscillator due to transmitting terminal spreading code clock
The code Doppler frequency shift r that exactness introduces2, random variation in a certain range.Corresponding, carrier Doppler shift f is also by two
A part composition, a part is the carrier Doppler shift f due to caused by the relative motion between transmitting terminal and receiving end1, separately
A part is the carrier Doppler shift f for using crystal oscillator accuracy to introduce due to transmitting terminal up-conversion2, in a certain range at random
Variation.r1With f1Meet following relationship:
Wherein, R is spread-spectrum code rate, and F is carrier radio frequency frequency, i.e. r1With f1For coherent relationship.Due to r2With f2It is all certain
Change at random in range, and uncorrelated, it is known that, code Doppler frequency shift r and carrier Doppler shift f are unsatisfactory for coherent relationship.
Traditional code acquisition method only considers the case where code Doppler and carrier doppler coherent, and it is more to be applied to code
When in the spread spectrum system of Pu Le and the non-coherent of carrier doppler, non-coherent will lead to receive and generate between signal and local spreading code
Chip drift, it is difficult to obtain integral gain, cause leakage or erroneous arrest.
Summary of the invention
The purpose of the present invention is provide a kind of for code for shortcoming existing for traditional code acquisition method
The spread spectrum system of Doppler and the non-coherent of carrier doppler can be realized and quickly accurately capture to spread spectrum code phase and Doppler
Non-coherent spread-spectrum signal quick capturing method.
Above-mentioned purpose of the invention can be reached by the following measures, a kind of non-coherent spread-spectrum signal fast Acquisition side
Method has following technical characteristic: in spread spectrum receiver system, with low-converter 1, resampling unit 2, data storage cell 3, simultaneously
Row processing unit 14, pn code generator 10, branch selecting unit 11, smart frequency senser 12 and main control unit 13 construct non-coherent and expand
Frequency signal acquisition circuitry is sent into parallel processing element 14 firstly, pn code generator 10 generates local spread spectrum code sequence, parallel to locate
Reason unit 14 takes out data from data storage cell 3, carries out multidiameter delay processing, divides slot control according to what main control unit 13 was sent
Information processed carries out frequency and divides slot, compensates to carrier doppler, then successively to carry out matched filtering, coherent integration, zero padding quick
Fourier transform FFT and non-coherent integration then carry out various dimensions peak value searching to multiple tributary signals, obtain phase capturing result
And carrier frequency rough estimate is as a result, and send the phase capturing result of acquisition and carrier frequency rough estimate result into main control unit
13, main control unit 13 is according to the phase capturing as a result, generation phase control information and selection control information, phase controlling is believed
Breath is sent into pn code generator 10, is adjusted to the phase for the local spread spectrum code sequence that pn code generator 10 generates, then will selection
It controls information and is sent into branch selecting unit 11, branch selecting unit 11 selects to connect from the matched filtering output signal of multidiameter delay
That signal all the way collected mail number with local spread spectrum code sequence phase alignment, is output to smart frequency senser 12, smart frequency senser 12 exists
Accurate measurement frequency is carried out to signal on the basis of carrier frequency rough estimate result, estimates the carrier frequency for receiving signal, and acquisition
The accurate estimated result of carrier frequency feed back to main control unit 13, the output capture result of main control unit 13.
The present invention has the advantages that compared with the prior art
The present invention after obtaining the phase information for receiving signal, feeds back to branch selecting unit, branch selection using main control unit
The signal of Unit selection phase alignment, that is, signal after de-spreading give smart frequency senser and carry out frequency measurement, can realize phase capturing
In the case where, the accurate capture of signal carrier Doppler is realized with extremely low implementation complexity.
The present invention increases frequency before to matched filtering module and divides channel mould block, first before signal carries out correlation to receiving
Frequency Doppler is pre-compensated for, is made in the signal relevant time, the drift of chip caused by remaining code Doppler is less than half
A chip weakens non-coherent and loses to integral gain of the signal after related.
The present invention replaces the coherent integration of conventional method using two modules of coherent integration and zero padding fast Fourier transform FFT
Module realizes the coherent integration under multidiameter delay frequency fluting using fast Fourier transform FFT, further to the how general of non-coherent
Le compensates, and eliminates influence of the Doppler frequency shift to coherent integration.
Detailed description of the invention
Fig. 1 is non-coherent spread-spectrum signal quick capturing method schematic illustration of the present invention.
Fig. 2 is the schematic illustration of the resampling unit in Fig. 1.
Fig. 3 is the schematic illustration of the smart frequency senser in Fig. 1.
In figure: 1 low-converter, 2 resampling units, 3 data storage cells, 4 frequencies divide channel mould block, 5 matched filtering modules,
6 coherent integration modules, 7 zero padding fast Fourier transform FFT modules, 8 non-coherent integration modules, 9 maximum value modules, 10 pseudo-codes generate
Device, 11 branch selecting units, 12 smart frequency sensers, 13 main control units, 14 parallel processing elements.
Invention will be further explained below with reference to the drawings and examples..
Specific embodiment
Refering to fig. 1.According to the present invention, with low-converter 1, resampling unit 2, data storage cell 3, parallel processing element
14, pn code generator 10, branch selecting unit 11, smart frequency senser 12 and main control unit 13 construct non-coherent spread-spectrum signal capture
Circuit is sent into parallel processing element 14 firstly, pn code generator 10 generates local spread spectrum code sequence, parallel processing element 14 from
Data are taken out in data storage cell 3, carry out multidiameter delay processing, divide slot control information to carry out according to what main control unit 13 was sent
Frequency divides slot, compensates to carrier doppler, then successively carries out matched filtering, coherent integration, zero padding fast Fourier transform FFT
And non-coherent integration, various dimensions peak value searching then is carried out to multiple tributary signals, obtains phase capturing result and carrier frequency
Rough estimate is as a result, and send the phase capturing result of acquisition and carrier frequency rough estimate result into main control unit 13, main control unit
13 according to the phase capturing as a result, generate phase control information and selection control information, phase control information is sent into pseudo-code
Generator 10 is adjusted the phase for the local spread spectrum code sequence that pn code generator 10 generates, then selection control information is sent
Enter branch selecting unit 11, branch selecting unit 11 selects to receive signal and this from the matched filtering output signal of multidiameter delay
That signal all the way of ground spread spectrum code sequence phase alignment, is output to smart frequency senser 12, smart frequency senser 12 is thick in carrier frequency
Accurate measurement frequency is carried out to signal on the basis of estimated result, estimates the carrier frequency for receiving signal, and the carrier frequency of acquisition
Accurate estimated result feeds back to main control unit 13, the output capture result of main control unit 13.Wherein, parallel processing element 14 includes more
The frequency of road sequential series divides channel mould block 4, matched filtering module 5, coherent integration module 6, zero padding fast Fourier transform FFT module
7, non-coherent integration module 8 and maximum value module 9.Main control unit 13 will divide slot control information to be sent into each branch frequency first and divide slot
Module 4, frequency divides channel mould block 4 to divide slot control information progress frequency to divide slot according to what main control unit 13 was sent, to carrier doppler
Compensate, then by compensated signal be sent into matched filtering module 5, each flow adaptation filter module 5 by input signal with
The local spreading code that pn code generator 10 generates does sliding correlation, and the relevant result of sliding is successively then sent into each branch and is concerned with
Integration module 6, zero padding fast Fourier transform FFT module 7 and non-coherent integration module 8 are sent into after carrying out energy accumulation to signal
Maximum value module 9, the signal exported to multiple branch circuit non-coherent integration module 8 carry out capture peak value searching, obtain all branch letters
Number various dimensions maximum value, thus obtain receive signal phase capturing result and carrier frequency rough estimate as a result, and being sent into master
Control unit 13.
Main control unit 13 is according to phase capturing as a result, phase control information and selection control information are generated, by phase controlling
Information is sent into pn code generator 10, is adjusted, will select to the phase for the local spread spectrum code sequence that pn code generator 10 generates
It controls information and is sent into branch selecting unit 11, branch selecting unit 11 selects to connect from the matched filtering output signal of multidiameter delay
That signal all the way collected mail number with local spread spectrum code sequence phase alignment, is output to smart frequency senser 12, smart frequency senser 12 exists
Accurate measurement frequency is carried out to signal in carrier frequency rough estimate result, estimates the carrier frequency for receiving signal, and the carrier wave of acquisition
The accurate estimated result of frequency feeds back to main control unit 13, the output capture result of main control unit 13.
Low-converter 1 will be sent into resampling unit 2, resampling unit after the digital medium-frequency signal down-converted received
2 carry out resampling to the signal after down coversion according to the integral multiple of spread spectrum code rate, and the data after resampling are sent into data storage
Unit 3 is stored；Parallel processing element 14 takes out data from data storage cell 3, carries out phase capturing；Parallel processing list
Member 14 carries out frequency to reception signal first and divides slot, pre-compensates for, makes in the signal relevant time to frequency Doppler, remaining
Code Doppler caused by chip drift be less than half-chip；Then the signal after precompensation is carried out with local spread spectrum code sequence
Matched filtering；Then coherent integration is carried out, noise is carried out smooth；Subsequently, using zero padding fast Fourier transform FFT, to non-
The Doppler of coherent compensates, and eliminates influence of the Doppler frequency shift to coherent integration；Then, non-coherent integration is carried out, to letter
Number energy is further accumulated；Various dimensions maximum value search finally is carried out to multiple tributary signals, so that the phase for obtaining signal is caught
Obtain result and carrier frequency rough estimate result.
Refering to Fig. 2.In resampling, resampling unit is using the signal after down coversion as input, first with accumulator
It adds up to input, then accumulation result is sampled when enable signal is effective to obtain output signal, while to cumulative
Device is reset, and then recycles this process, is completed to any than down-sampled operation of input signal.Resampling unit is after down coversion
The sampling rate of signal be reduced to spread spectrum N times of code rate R, requirement and hardware available resources according to system to acquisition accuracy
Etc. factors, N generally take 2 or 4.
Refering to Fig. 3.In accurate measurement frequency, main control unit 13 generates selection control information, branch choosing according to phase capturing result
Unit is selected to select to receive signal and local spread spectrum code sequence phase alignment from parallel multichannel matched filtering module output signal
That all the way signal as output, be sent into accurate measurement frequency module；Smart frequency senser is carried out according to carrier frequency rough estimate result first
Frequency precompensation, then according to frequency acquisition accuracy requirement and available hardware resource, selects suitable signal processing frequency, carries out
Resampling；Then, fast Fourier transform FFT operation is carried out, and carries out power calculation；Finally, carrying out peak value searching, line frequency of going forward side by side
Rate calculates, to obtain frequency acquisition result.
The embodiment of the present invention has been described in detail above, and specific embodiment used herein carries out the present invention
It illustrates, the above description of the embodiments is only used to help understand the method and apparatus of the present invention；Meanwhile for the one of this field
As technical staff, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, to sum up institute
It states, the contents of this specification are not to be construed as limiting the invention.
Claims (8)
1. a kind of non-coherent spread-spectrum signal quick capturing method has following technical characteristic: in spread spectrum receiver system, becoming below
Frequency device (1), resampling unit (2), data storage cell (3), parallel processing element (14), pn code generator (10), branch choosing
Unit (11), smart frequency senser (12) and main control unit (13) building non-coherent spread-spectrum signal capture circuit are selected, firstly, pseudo-code produces
Raw device (10) generate local spread spectrum code sequence, are sent into parallel processing element (14), and parallel processing element (14) stores single from data
Data are taken out in first (3), carry out multidiameter delay processing, divide slot control information to carry out frequency point according to what main control unit (13) was sent
Slot compensates carrier doppler, then successively carries out matched filtering, coherent integration, zero padding fast Fourier transform FFT and non-phase
Multiple tributary signals are then carried out various dimensions peak value searching, obtain phase capturing result and carrier frequency rough estimate by dry integral
As a result, and the phase capturing result of acquisition and carrier frequency rough estimate result are sent into main control unit (13), main control unit (13)
According to the phase capturing as a result, generating phase control information and selection control information, phase control information is sent into pseudo-code and is produced
Raw device (10) are adjusted the phase for the local spread spectrum code sequence that pn code generator (10) generate, then selection is controlled information
It is sent into branch selecting unit (11), branch selecting unit (11), which selects to receive from the matched filtering output signal of multidiameter delay, to be believed
That signal all the way number with local spread spectrum code sequence phase alignment, is output to smart frequency senser (12), smart frequency senser (12) exists
Accurate measurement frequency is carried out to signal on the basis of carrier frequency rough estimate result, estimates the carrier frequency for receiving signal, and acquisition
The accurate estimated result of carrier frequency feed back to main control unit (13), main control unit (13) output capture result.
2. non-coherent spread-spectrum signal quick capturing method as described in claim 1, it is characterised in that: parallel processing element (14)
Frequency including multichannel sequential series divides channel mould block 4, matched filtering module (5), coherent integration module (6), zero padding fast Fourier
Convert FFT module (7), non-coherent integration module (8) and maximum value module (9).
3. non-coherent spread-spectrum signal quick capturing method as described in claim 1, it is characterised in that: main control unit (13) is first
Slot control information will be divided to be sent into each branch frequency to divide channel mould block (4), point that frequency divides channel mould block 4 to be sent according to main control unit (13)
Slot control information carries out frequency and divides slot, compensates to carrier doppler, compensated signal is then sent into matched filtering mould
Block (5).
4. non-coherent spread-spectrum signal quick capturing method as claimed in claim 3, it is characterised in that: each flow adaptation filters mould
It is related that input signal and the local spreading code that pn code generator 10 generates are done sliding by block (5), then sliding relevant result
It is successively sent into each branch coherent integration module (6), zero padding fast Fourier transform FFT module (7) and non-coherent integration module (8),
Maximum value module (9) are sent into after carrying out energy accumulation to signal, the signal of multiple branch circuit non-coherent integration module (8) output is carried out
Capture peak value searching, obtain the various dimensions maximum value of all tributary signals, thus obtain receive signal phase capturing result and
Carrier frequency rough estimate is as a result, and be sent into main control unit (13).
5. non-coherent spread-spectrum signal quick capturing method as claimed in claim 5, it is characterised in that: main control unit (13) basis
Phase capturing controls information as a result, generating phase control information and selection, and phase control information is sent into pn code generator (10),
The phase for the local spread spectrum code sequence that pn code generator (10) generate is adjusted, selection control information is sent into branch selection
Unit (11), branch selecting unit (11) select to receive signal and local spread spectrum from the matched filtering output signal of multidiameter delay
That signal all the way of code sequence phase alignment, is output to smart frequency senser (12), smart frequency senser (12) is in carrier frequency rough estimate
It counts and accurate measurement frequency is carried out to signal in result, estimate the carrier frequency for receiving signal, and the carrier frequency of acquisition is accurately estimated
As a result it feeds back to main control unit (13), main control unit (13) output capture result.
6. non-coherent spread-spectrum signal quick capturing method as described in claim 1, it is characterised in that: parallel processing element (14)
Frequency is carried out to reception signal first and divides slot, frequency Doppler is pre-compensated for, is made in the signal relevant time, remaining code
The drift of chip caused by Doppler is less than half-chip；Then the signal after precompensation is matched with local spread spectrum code sequence
Filtering；Then coherent integration is carried out, noise is carried out smooth；Subsequently, using zero padding fast Fourier transform FFT, to non-coherent
Doppler compensate, eliminate influence of the Doppler frequency shift to coherent integration；Carry out non-coherent integration again, to signal energy into
The accumulation of one step；Finally to multiple tributary signals carry out various dimensions maximum value search, thus obtain signal phase capturing result and
Carrier frequency rough estimate result.
7. non-coherent spread-spectrum signal quick capturing method as described in claim 1, it is characterised in that: in accurate measurement frequency, master control
Unit (13) generates selection control information according to phase capturing result, and branch selecting unit is from parallel multichannel matched filtering module
That of reception signal and local spread spectrum code sequence phase alignment are selected in output signal, and signal is sent into accurate measurement frequently as output all the way
Module.
8. non-coherent spread-spectrum signal quick capturing method as claimed in claim 6, it is characterised in that: smart frequency senser root first
Frequency precompensation is carried out according to carrier frequency rough estimate result, then according to frequency acquisition accuracy requirement and available hardware resource, choosing
Suitable signal processing frequency is selected, resampling is carried out；Then, fast Fourier transform FFT operation is carried out, and carries out power calculation；
Finally, carrying out peak value searching, line frequency of going forward side by side is calculated, to obtain frequency acquisition result.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110401611A (en) * | 2019-06-29 | 2019-11-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The quickly method of detection CPFSK signal |
| CN110505173A (en) * | 2019-09-29 | 2019-11-26 | 四川安迪科技实业有限公司 | A kind of simple catching method and device of big frequency deviation burst signal |
| CN112910497A (en) * | 2021-01-18 | 2021-06-04 | 清华大学 | Quick code capture method for short-spreading-ratio satellite communication system |
| CN115499036A (en) * | 2022-11-14 | 2022-12-20 | 北京航空航天大学合肥创新研究院(北京航空航天大学合肥研究生院) | Parallel capturing method and storage medium for broadband spread spectrum signal |
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| CN115499036B (en) * | 2022-11-14 | 2023-02-24 | 北京航空航天大学合肥创新研究院(北京航空航天大学合肥研究生院) | Parallel capturing method and storage medium for broadband spread spectrum signal |
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