CN103078660B - Method for reducing capturing time of spreading code in large dynamic range - Google Patents
Method for reducing capturing time of spreading code in large dynamic range Download PDFInfo
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Abstract
The invention provides a method for reducing capturing time of a spreading code in a large dynamic range and aims to provide a spreading code capturing method which is large in dynamic application range and can obviously shorten the capturing time. The technical scheme for realizing the method comprises the following steps of firstly, performing down-sampling and storage on baseband data subjected to down-conversion at two-time spreading code speed, reading stored data from a storage by a high-speed clock, dividing a frequency channel according to a Doppler frequency offset range, and performing Doppler frequency compensation on the read data according to the center frequency of each frequency channel; secondly, generating the corresponding spreading codes in the local place according to a code clock subjected to Doppler frequency compensation and corresponding to each frequency channel, and sampling and storing the spreading codes generated by different frequency channels by a two-time standard code clock; and finally, reading the spreading code corresponding to each frequency channel from the storage by the high-speed clock, and performing correlation calculation on the spreading codes and a signal subjected to the Doppler frequency compensation, wherein the pseudo-code phase and the Doppler which correspond to the highest correlation value are the final capturing result.
Description
Technical field
The present invention relates to a kind of frequency expansion sequence catching method of Resistant DS Spread Spectrum System.Be mainly used in the digital baseband equipment of Resistant DS Spread Spectrum System, Doppler spread reaches ± more than 1MHz, and doppler changing rate reaches the fast Acquisition of Resistant DS Spread Spectrum System spreading code under the Larger Dynamic of more than 100KHz/S.
Background technology
Spread spectrum communication is one of 21st century communications field research communication system the most extensively and profoundly.In the social demand environment that the special channel circumstance day by day complicated in today and personal communication receive much attention, the confidentiality that spread spectrum communication is outstanding and noise robustness seem very important.In whole spread spectrum system, receiving terminal is a key technology determining whole system success or failure to catching of transmitting terminal spreading code.So-called direct sequence (DS) spread spectrum, the direct exactly spread spectrum code sequence with having high code check is general at the frequency of spread signal of making a start.And in receiving end, go to carry out despreading with identical spread spectrum code sequence, the spread-spectrum signal of broadening is reduced into original information.
Along with the development of modern space technology, the operating distance of aircraft is more and more far away, flying speed is more and more faster, percentage speed variation is increasing, this brings new problem to Spread Spectrum TT&C system: first in order to solve ultra-distance communication, ensure that the signal strength signal intensity arriving the earth is in certain level, needs working frequency range to bring up to Ka frequency range.When aircraft movements state is constant, that signal transmission can be made to comprise is larger dynamic in the raising of working frequency range.Secondly the raising of aircraft speed makes dynamically expanding further of signal transmission, and the raising of percentage speed variation causes the corresponding increase of doppler changing rate in addition.For the catching of Resistant DS Spread Spectrum System spreading code, need the Doppler spread of search and doppler changing rate to expand a lot.Spread spectrum code acquisition has several important index, acquisition sensitivity, capture time, adaptable dynamic range.Acquisition sensitivity determined primarily of the time of integration, capture time and adaptable dynamically closely related, and the shorter adaptable dynamic range of capture time is larger.For once complete acquisition procedure, capture time comprises data sampling time and processing time.Processing time can be realized by increase resource and optimized algorithm, and when being significantly less than the sampling time when treated, there is conclusive impact in the sampling time on whole capture time, and shorten whole capture time can only complete by reducing the sampling time.
Usual Resistant DS Spread Spectrum System adopts pseudo noise code (abbreviation pseudo-code) to carry out spread spectrum to information code at transmitting terminal; At receiving terminal, only have when the pseudo-code in local pseudo-code and Received signal strength reaches synchronous in phase place, the despreading to information code could be realized.The effect of acquiring pseudo code realizes the thick synchronous of pseudo-code phase and carrier doppler according to a preliminary estimate, for follow-up pseudo-code tracing and carrier track link provide phase place and initial frequency, so acquiring pseudo code is a time-frequency two-dimensional search procedure.What traditional acquiring pseudo code adopted usually is directly carries out to the base band data received the acquisition algorithm that frequency divides groove, when Doppler spread is larger in the signal, first Doppler spread is carried out frequency and is divided groove, then in each frequency slots, data sampling, storage and correlation computations is carried out successively, finally from the correlated results of each frequency slots, select maximum correlation, catch result using the pseudo-code phase corresponding to this correlation and doppler values as final.The weak point of prior art spread spectrum code acquisition method is, under Larger Dynamic condition, whole Doppler frequency range is divided into a lot of frequency slots, in acquisition procedure, each frequency slots will carry out once down-sampled and data storage procedure, compensates and code Doppler effect correction this is because each frequency slots will carry out respective carrier doppler.One takes turns complete acquisition procedure needs to carry out repeated sampling to all frequency slots, the sampling time of a large amount of frequency slots stacks up and constitutes the bottleneck of whole capture time, anyway reduce the processing time, whole capture time all can not be less than the sampling time sum of whole frequency slots.Larger Dynamic spread-spectrum signal Doppler spread is wide, pace of change is fast, traditional acquisition mode is adopted to catch, not only whole capture time is longer, the more important thing is because doppler changing rate is very large, one takes turns carrier doppler when having searched in signal and very large change has occurred spreading code phase place, catches result and becomes meaningless.The fast Acquisition how completing spreading code under Larger Dynamic becomes the key factor affecting Larger Dynamic Receiver of Direct-sequence Spread Spectrum performance.
Summary of the invention
The object of the invention is long for prior art capture time in Larger Dynamic Resistant DS Spread Spectrum System, to the Rapid Variable Design bad adaptability of Doppler problem, provide a kind of and adapt to dynamic range greatly, significantly can shorten the spread spectrum code acquisition method of capture time.
The present invention solves the scheme that prior art problem adopts: a kind of method reducing the spread spectrum code acquisition time under Larger Dynamic, it is characterized in that comprising the steps: first being connected with between carrier wave and code tracking module a spread spectrum code acquisition module in the AD sampling of direct sequence spread spectrum observing and controlling receiver and down conversion module, secondly at carrier wave and code tracking module a test the speed range finder module in parallel with between demodulation module, sampled and down conversion module by the AD be connected on successively on same circuit, spread spectrum code acquisition module, carrier wave and code tracking module, demodulation module, cross-over connection is connected in parallel on carrier wave and the range finder module that tests the speed between code tracking module and demodulation module, form a Receiver of Direct-sequence Spread Spectrum, wherein spread spectrum code acquisition module is with the down-sampled rate of 2 times of spread-spectrum code rates, carry out down-sampled to the baseband digital signal that receiver receives, baseband signal after down-sampled is stored in data sub module stored, then from stored digital submodule, base band data is read with high-frequency clock with read data submodule, and send into frequency compensation submodule and carry out carrier Doppler frequency compensation, the current frequency slots parameter of submodule is controlled according to frequency slots, produce corresponding code clock and promote the spreading code of spreading code generation submodule generation with Doppler shift, deposit resample module with spreading code again, with twice reference number clock, resampling is carried out to the spreading code that different frequency groove produces, spreading code after resampling is stored in spreading code sub module stored, correlation computations module reads spreading code corresponding to each frequency slots with high-frequency clock from memory, after carrying out the correlation computations of a frequency slots with the signal carried out after frequency compensation, be switched to next frequency slots, finally the result of calculation of all frequency slots is sent into correlated results comparison sub-module, correlated results comparison sub-module compares the correlated results received, maximum correlation is selected from the correlated results of all frequency slots, result is caught as final using the spreading code phase place corresponding to this correlation and Doppler, spread spectrum code acquisition module is caught from spreading code phase place and Doppler frequency two aspect baseband signal, catch the spreading code phase place obtained and give carrier wave and code tracking module with Doppler frequency together with local counter, guide carrier tracking loop and code tracking loop to enter lock-out state, carrier tracking loop and code tracking loop Output rusults send into the recovery that demodulation module carries out data, the range finder module that tests the speed completes speed to observing and controlling target and range measurement according to the Output rusults of carrier tracking loop and code tracking loop and demodulation module.
The present invention has following beneficial effect compared to prior art:
The present invention adapts to the code clock deviation existed in sampled signal by the correction spreading code that produces in this locality carrying out Doppler shift, by first carrying out down-sampled to sampled data and storing, and then carry out carrier Doppler frequency compensation, once sampling just can complete whole acquisition procedure, avoid repeatedly repeated sampling to received signal, thus decrease capture time, improve adaptable dynamic range.The present invention is specially adapted to the fast Acquisition of short-period spreading code under Larger Dynamic.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, this patent is further illustrated.
Fig. 1 is direct sequence spread spectrum observing and controlling receiver principle block diagram.
Fig. 2 is spread spectrum code acquisition inside modules submodule division principle block diagram in Fig. 1.
Embodiment
Consult Fig. 1, Fig. 2.In the following description of the present invention most preferred embodiment, receiver for direct sequence spread spectrum TT&C system is sampled by the AD that is connected on same circuit and down conversion module, spread spectrum code acquisition module, carrier wave and code tracking module, demodulation module and be connected across carrier wave and the range finder module that tests the speed between code tracking module and demodulation module, 5 parts compositions successively totally.Wherein, AD sampling and down conversion module complete the digitized processing to analog signal, analog signal are converted into baseband digital signal, to carry out subsequent treatment.The method of spread spectrum code acquisition time under Larger Dynamic is reduced according to the present invention, first be carry out down-sampled to the baseband signal received, down-sampled rate is 2 times of spread-spectrum code rate, recycling memory stores the data after down-sampled and reads, store clock is down-sampled clock, and reading clock is high-frequency clock.Read data submodule reads data with high-frequency clock and gives Doppler effect correction submodule from memory, frequency slots controls submodule and divides frequency slots according to Doppler shift scope, the division of frequency slots needs to take into account carrier doppler and code clock Doppler, within total time of integration, the spreading code phase deviation between side frequency groove is no more than half-chip.Frequency compensation module carries out Doppler frequency compensation to the data after reading according to the centre frequency of each frequency slots, and Doppler frequency compensation carries out the storage data after down-sampled here.Next is that spreading code generation submodule produces corresponding spreading code according to the code clock corresponding to each frequency slots in this locality, read spreading code submodule twice reference number clock and carry out resampling and storage to the spreading code that different frequency groove produces, resampling herein completes a yard clock Doppler's compensation on local spreading code.Correlation computations submodule reads spreading code corresponding to each frequency slots with high-frequency clock from memory, correlation computations is carried out with the signal carried out after frequency compensation, next frequency slots is switched to after completing the correlation computations of a frequency slots, the result of calculation of all frequency slots sends into correlated results comparison sub-module, the correlated results of correlated results comparison sub-module to code phase different in each frequency slots compares, and peak-peak is selected from the correlated results of all frequency slots, the frequency corresponding to this peak value and phase place are exactly final catch result.In whole acquisition procedure, adopt local counter to count with the clock that twice code clock is used to acquisition procedure, caught rear handle and caught result give carrier wave and code tracking module together with local counter.
Spread spectrum code acquisition module is caught from spreading code phase place and Doppler frequency two aspect baseband signal, catches the spreading code phase place obtained and gives carrier wave with Doppler frequency together with local counter and code tracking module enters lock-out state to guide carrier tracking loop and code tracking loop; Carrier tracking loop and code tracking loop Output rusults send into the recovery that demodulation module carries out data; The range finder module that tests the speed completes speed to observing and controlling target and range measurement according to the Output rusults of carrier wave and code tracking loop and demodulation module.
Fig. 2 has done further submodule to the spread spectrum code acquisition module in Fig. 1 and has divided, this spread spectrum code acquisition module, comprise gather baseband signal down-sampled submodule and with series connection form, by data sub module stored, read data submodule, frequency compensation submodule, spreading code produces submodule, correlation computations submodule is connected successively, to result be caught output to the correlated results comparison sub-module of carrier wave and code tracking module, the frequency slots also comprising crosslinked frequency compensation submodule controls submodule and through spreading code resample module, spreading code sub module stored, read spreading code submodule controls submodule composition closed loop by correlation computations submodule annular rate of connections groove, and control with frequency slots the local counter that submodule is connected.
Catching of spread spectrum code acquisition module spreading code is the code clock deviation that correction spreading code by producing in this locality carrying out yard Doppler shift adapts to exist in sampled signal, that Doppler frequency compensation is carried out to the storage data after down-sampled, whole acquisition procedure of once having sampled.Specific implementation step is divided into the generation of local spreading code, data sampling stores and correlation computations three parts.
In order to make the Doppler of the spreading code in local spreading code and signal adapt, before catching beginning, needing basis ready-portioned frequency slots in advance, produce the spreading code matched with each frequency slots in this locality, specifically comprise following steps:
(1) spreading code produces: before acquisition procedure starts, and produces the spreading code with Doppler shift corresponding to each frequency slots according to the frequency slots divided in advance.
(2) spreading code resampling: carry out resampling with benchmark twice code clock to the spreading code that spreading code generation submodule produces, sampled result is given spreading code sub module stored and stored.
(3) spreading code stores: spreading code sub module stored with twice spread-spectrum code rate the spreading code after resampling stored in spreading code memory, memory length equals total and relevantly to count.
Catching at the beginning, first sample to the baseband signal received, sampling process comprises following steps:
(1) base band data is down-sampled: after acquisition procedure starts, down-sampled submodule extracts with the baseband signal of twice spread-spectrum code rate to input, and the signal after extraction is given data sub module stored and stored.
(2) data store: data sub module stored with twice spread-spectrum code rate the baseband signal after down-sampled stored in data sub module stored, store data length and equal total and relevantly to count.
After the storage completing local spreading code and Received signal strength, correlation computations is carried out to the local spreading code stored and Received signal strength.Correlation computations process comprises following steps:
(1) sampled data reads: read data submodule reads storing complete base band data from data sub module stored with high-frequency clock, gives frequency compensation submodule and carries out carrier Doppler frequency compensation.
(2) carrier doppler compensates: the ongoing frequency groove parameter that frequency compensation submodule is sent here according to frequency slots control submodule carries out Doppler frequency compensation to the data read from data sub module stored.
(3) spreading code reads: read spreading code submodule and control the ongoing frequency groove parameter sent here of submodule according to frequency slots and from spreading code memory, read the spreading code corresponding with this frequency slots with high-frequency clock.
(4) correlation computations: read the spreading code that spreading code submodule reads, gives correlation computations submodule carry out correlation computations with the sampled data after having carried out frequency compensation.
(5) frequency slots switches: after correlation computations submodule completes the phase calculation of all spreading codes in a frequency slots, frequency slots controls submodule and is switched to next frequency slots according to the switching mark that correlation computations submodule is sent here, until complete the correlation computations process of all frequency slots.
(6) correlation is selected: correlated results comparison sub-module selects maximum from the correlated results of all frequency slots, and the spreading code phase place that this maximum is corresponding and frequency values are exactly final catch result.
(7) acquisition procedure counting: adopt local counter to count with the clock that twice code clock is used to acquisition procedure in whole acquisition procedure, caught rear handle and caught result give carrier wave and code tracking module together with local counter.
Claims (2)
1. one kind is reduced the method for spread spectrum code acquisition time under Larger Dynamic, it is characterized in that comprising the steps: first being connected with between carrier wave and code tracking module a spread spectrum code acquisition module in the AD sampling of direct sequence spread spectrum observing and controlling receiver and down conversion module, spread spectrum code acquisition module comprise gather baseband signal down-sampled submodule and with series connection form, by data sub module stored, read data submodule, frequency compensation submodule, correlation computations submodule is connected successively, to result be caught output to the correlated results comparison sub-module of carrier wave and code tracking module, the spreading code generation submodule that the frequency slots also comprising crosslinked frequency compensation submodule controls submodule and connects successively, spreading code resample module, spreading code sub module stored, read spreading code submodule, wherein read spreading code submodule controls submodule composition closed loop by correlation computations submodule annular rate of connections groove, and control with frequency slots the local counter that submodule is connected, secondly at carrier wave and code tracking module a test the speed range finder module in parallel with between demodulation module, sampled and down conversion module by the AD be connected on successively on same circuit, spread spectrum code acquisition module, carrier wave and code tracking module, demodulation module, cross-over connection is connected in parallel on carrier wave and the range finder module that tests the speed between code tracking module and demodulation module, form a Receiver of Direct-sequence Spread Spectrum, wherein spread spectrum code acquisition module is with the down-sampled rate of 2 times of spread-spectrum code rates, carry out down-sampled to the baseband digital signal that receiver receives, baseband signal after down-sampled is stored in data sub module stored, then from stored digital submodule, base band data is read with high-frequency clock with read data submodule, and send into frequency compensation submodule and carry out carrier Doppler frequency compensation, the current frequency slots parameter of submodule is controlled according to frequency slots, produce corresponding code clock and promote the spreading code of spreading code generation submodule generation with Doppler shift, deposit resample module with spreading code again, with twice reference number clock, resampling is carried out to the spreading code that different frequency groove produces, spreading code after resampling is stored in spreading code sub module stored, correlation computations module reads spreading code corresponding to each frequency slots with high-frequency clock from memory, after carrying out the correlation computations of a frequency slots with the signal carried out after frequency compensation, be switched to next frequency slots, finally the result of calculation of all frequency slots is sent into correlated results comparison sub-module, correlated results comparison sub-module compares the correlated results received, maximum correlation is selected from the correlated results of all frequency slots, result is caught as final using the spreading code phase place corresponding to this correlation and Doppler, spread spectrum code acquisition module is caught from spreading code phase place and Doppler frequency two aspect baseband signal, catch the spreading code phase place obtained and give carrier wave and code tracking module with Doppler frequency together with local counter, guide carrier tracking loop and code tracking loop to enter lock-out state, carrier tracking loop and code tracking loop Output rusults send into the recovery that demodulation module carries out data, the range finder module that tests the speed completes speed to observing and controlling target and range measurement according to the Output rusults of carrier tracking loop and code tracking loop and demodulation module.
2. by the method for spread spectrum code acquisition time under minimizing Larger Dynamic according to claim 1, it is characterized in that, frequency slots control module divides frequency slots according to Doppler shift scope, the division of frequency slots takes into account carrier doppler and code clock Doppler, within total time of integration, the spreading code phase deviation between side frequency groove is no more than half-chip.
3. by the method for spread spectrum code acquisition time under minimizing Larger Dynamic according to claim 1, it is characterized in that, the spreading code that the compensation of code clock Doppler produces in this locality carries out, and be first carry out down-sampled to the baseband signal after down-conversion, and then point frequency slots carries out Doppler frequency compensation to signal after down-sampled.
4. by the method for spread spectrum code acquisition time under minimizing Larger Dynamic according to claim 1, it is characterized in that, spread spectrum code acquisition module is on spreading code by producing in this locality to catching of spreading code, the correction carrying out yard Doppler shift is to adapt to the code clock deviation that exists in sampled signal, that Doppler frequency compensation is carried out to the storage data after down-sampled, whole acquisition procedure of once having sampled.
5. by the method for spread spectrum code acquisition time under minimizing Larger Dynamic according to claim 1, it is characterized in that, base band data is down-sampled is that down-sampled submodule extracts with the baseband signal of twice spread-spectrum code rate to input, and the signal after extraction is given data sub module stored and stored.
6. by the method for spread spectrum code acquisition time under minimizing Larger Dynamic according to claim 1, it is characterized in that, data storage is data sub module stored with twice spread-spectrum code rate the baseband signal after down-sampled stored in data sub module stored, stores data length and equals total and relevantly to count.
7. by the method for spread spectrum code acquisition time under minimizing Larger Dynamic according to claim 1, it is characterized in that, spreading code resampling is sampled to the spreading code that spreading code generation submodule produces with benchmark twice code clock, and sampled result is given spreading code sub module stored and stored.
8. by the method for spread spectrum code acquisition time under minimizing Larger Dynamic according to claim 1, it is characterized in that, spreading code storage be spreading code sub module stored with twice spread-spectrum code rate the spreading code after resampling stored in spreading code memory, memory length equals total and relevantly to count.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103269259B (en) * | 2013-05-23 | 2016-09-21 | 小米科技有限责任公司 | A kind of signal demodulating method and device |
| CN103412316A (en) * | 2013-07-05 | 2013-11-27 | 北京航空航天大学 | Self-adaptive tracking method for direct sequence spread spectrum signal in real-time positioning system |
| CN103532894B (en) * | 2013-10-28 | 2017-04-12 | 成都航天通信设备有限责任公司 | TCM-8PSK baseband signal demodulation method |
| CN103873105B (en) * | 2014-01-27 | 2016-07-06 | 中国电子科技集团公司第十研究所 | High dynamic weak DS/FH hybrid spread spectrum signal acquisition system |
| CN104065397B (en) * | 2014-06-30 | 2016-04-27 | 西安电子科技大学 | Real-time synchronization catches method and the device of pseudo-code |
| CN106788470B (en) * | 2016-11-25 | 2019-03-29 | 西安烽火电子科技有限责任公司 | High data rate bursts communication quick capturing method and device based on spread spectrum |
| CN107026810A (en) * | 2017-03-17 | 2017-08-08 | 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 PN synchronization method of burst directly-enlarging system and its DS waveform that happens suddenly |
| CN108055058B (en) * | 2017-11-22 | 2020-04-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High-precision measurement method for carrier Doppler and change rate thereof |
| CN108226968B (en) * | 2018-01-03 | 2021-05-11 | 电子科技大学 | Navigation signal rapid capturing method |
| CN108880746A (en) * | 2018-05-25 | 2018-11-23 | 共享智能铸造产业创新中心有限公司 | The acquisition method and its acquisition system of correct data in radio communication data |
| CN108900452A (en) * | 2018-05-25 | 2018-11-27 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Reduce the synchronization detecting method of frequency window |
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