CN103078660A - Method for reducing capturing time of spreading code in large dynamic range - Google Patents
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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.Being mainly used in the digital baseband equipment of Resistant DS Spread Spectrum System, the Doppler scope reaches ± and more than the 1MHz, the Doppler rate of change reaches the fast Acquisition of the above large dynamically lower Resistant DS Spread Spectrum System spreading code of 100KHz/S.
Background technology
Spread spectrum communication is one of 21st century communications field research communication system the most extensively and profoundly.Especially in the social demand environment that today, day by day complicated channel circumstance and personal communication received much attention, it is very important that the confidentiality that spread spectrum communication is outstanding and noise robustness seem.In whole spread spectrum system, receiving terminal is a key technology that determines the whole system success or failure to catching of transmitting terminal spreading code.So-called direct sequence (DS) spread spectrum is exactly directly with having the spread spectrum code sequence of high code check at the frequency spectrum 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.
Development along with the 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 has brought new problem for the spread spectrum TT﹠C system: at first in order to solve overlength distance communication, the signal strength signal intensity that guarantees to arrive the earth need to be brought up to the Ka frequency range to working frequency range in certain level.In the situation that the raising of the constant working frequency range of aircraft movements state can make signal transmission comprise larger dynamically.Secondly the raising of aircraft speed makes dynamically further enlarging of signal transmission, and the raising of percentage speed variation causes the corresponding increase of Doppler rate of change in addition.For the catching of Resistant DS Spread Spectrum System spreading code, need Doppler scope and the Doppler rate of change of search to enlarge a lot.Spread spectrum code acquisition has several important indexs, acquisition sensitivity, capture time, adaptable dynamic range.Acquisition sensitivity is mainly determined by the time of integration, capture time and adaptable dynamically closely related, and the shorter adaptable dynamic range of capture time is just larger.For once complete acquisition procedure, capture time comprises data sampling time and processing time.Processing time can realize by increasing resource and optimized algorithm, and when the processing time was significantly less than the sampling time, there was conclusive impact in the sampling time on whole capture time, shorten whole capture time and can only finish by reducing the sampling time.
Usually Resistant DS Spread Spectrum System adopts pseudo noise code (abbreviation pseudo-code) that information code is carried out spread spectrum at transmitting terminal; At receiving terminal, only have the pseudo-code in local pseudo-code and reception signal to reach synchronously in phase place, could realize the despreading to information code.The effect of acquiring pseudo code is to realize the synchronously thick and carrier wave Doppler of pseudo-code phase according to a preliminary estimate, for follow-up pseudo-code tracing and carrier track link provide phase place and frequency initial value, so acquiring pseudo code is a time-frequency two-dimensional search procedure.What traditional acquiring pseudo code adopted usually is directly the base band data that receives to be carried out the acquisition algorithm that frequency is divided groove, when the Doppler scope is larger in signal, at first the Doppler scope is carried out frequency and is divided groove, then in each frequency slots, carry out successively data sampling, storage and correlation computations, from the correlated results of each frequency slots, select at last maximum correlation, with the corresponding pseudo-code phase of this correlation and Doppler value as the final result that catches.The weak point of prior art spread spectrum code acquisition method is, under large dynamic condition, whole doppler frequency scope is divided into a lot of frequency slots, each frequency slots will be carried out once down-sampled and data storage procedure in acquisition procedure, and this is because each frequency slots will be carried out the compensation of carrier wave Doppler and the compensation of code Doppler separately.One takes turns complete acquisition procedure need to carry out repeated sampling to all frequency slots, the sampling time of a large amount of frequency slots stacks up and has consisted of the bottleneck of whole capture time, anyway reduce the processing time, whole capture time can be less than the sampling time sum of whole frequency slots.Large dynamic spread spectrum signal Doppler wide ranges, pace of change is fast, adopt traditional acquisition mode to catch, not only whole capture time is longer, the more important thing is because the Doppler rate of change is very large, one take turns search when finishing carrier wave Doppler and the spreading code phase place in the signal very large change has occured, catch the result and become meaningless.How to become the large dynamically key factor of Receiver of Direct-sequence Spread Spectrum performance of impact at the large dynamically lower fast Acquisition of finishing spreading code.
Summary of the invention
The objective of the invention is long for prior art capture time in large dynamically Resistant DS Spread Spectrum System, to the problem of Doppler's quick variation bad adaptability, provide a kind of adaptation dynamic range large, can significantly shorten the spread spectrum code acquisition method of capture time.
The present invention solves the scheme that the prior art problem adopts: a kind ofly reduce the large dynamically method of lower spread spectrum code acquisition time, it is characterized in that comprising the steps: at first the spread spectrum code acquisition module that between the AD sampling of direct sequence spread spectrum observing and controlling receiver and down conversion module and carrier wave and code tracking module, links to each other, secondly the range finder module that tests the speed in parallel between carrier wave and code tracking module and demodulation module; Take reduce sampling frequency as spread-spectrum code rate 2 times of spread spectrum code acquisition module, the baseband digital signal that receiver is received carries out down-sampled, baseband signal after down-sampled deposits in the data storage, then from memory, read base band data with the read data submodule with high-frequency clock, and send into the frequency compensation submodule and carry out the compensation of carrier wave doppler frequency; Again according to the current frequency slots parameter of frequency slots control submodule, produce corresponding code clock and promote the generation of spreading code generator with the spreading code of Doppler frequency deviation, utilize the spreading code sub module stored with twice reference number clock the spreading code that the different frequency groove produces to be resampled, after spreading code after the resampling deposits in the spreading code memory, the correlation computations submodule is read spreading code corresponding to each frequency slots with high-frequency clock from memory, with carried out after the signal after the frequency compensation carries out the correlation computations of a frequency slots, switch to next frequency slots, then the result of calculation of all frequency slots is sent into comparison module, comparison module is selected peak-peak from the correlated results of each frequency slots, with the corresponding pseudo-code phase of this correlation and Doppler as the final result that catches.
The present invention has following beneficial effect than prior art:
The present invention adapts to the code clock deviation that exists in the sampled signal by the correction that the spreading code that produces in this locality carries out the Doppler frequency deviation, by carrying out down-sampled to sampled data first and storage, and then carry out carrier wave doppler frequency compensation, once sampling just can be finished whole acquisition procedure, avoided repeatedly repeated sampling to received signal, thereby reduced capture time, improved adaptable dynamic range.The present invention is specially adapted to the fast Acquisition of large dynamically lower short-period spreading code.
Description of drawings
Below in conjunction with drawings and Examples this patent is further specified.
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 among Fig. 1.
Embodiment
Consult Fig. 1, Fig. 2.In the following description of the present invention most preferred embodiment, the receiver that is used for the direct sequence spread spectrum TT﹠C system successively by be connected on AD sampling and down conversion module, spread spectrum code acquisition module, carrier wave and code tracking module, the demodulation module on the same circuit and be connected across carrier wave and code tracking module and demodulation module between the range finder module that tests the speed, totally 5 parts form.Wherein, AD sampling and down conversion module are finished the digitized processing to analog signal, analog signal are converted into baseband digital signal, in order to carry out subsequent treatment.Reduce the large dynamically method of lower spread spectrum code acquisition time according to the present invention, at first be to carry out down-sampled to the baseband signal that receives, reduce sampling frequency is 2 times of spread-spectrum code rate, the recycling memory is stored and is read the data after down-sampled, store clock is down-sampled clock, and reading clock is high-frequency clock.The read data submodule is given Doppler compensation submodule with high-frequency clock reading out data from memory, frequency slots control submodule is divided frequency slots according to the Doppler frequency deviation region, the division of frequency slots need to take into account carrier wave Doppler and code clock Doppler, within total time of integration, the spreading code phase deviation between the side frequency groove is no more than half-chip.The frequency compensation module is carried out the doppler frequency compensation to the data after reading according to the centre frequency of each frequency slots, and doppler frequency compensation here is what the storage data after down-sampled were carried out.Next is that spreading code generation submodule produces corresponding spreading code according to the corresponding code of each frequency slots clock in this locality, read spreading code that the spreading code submodule produces the different frequency groove with twice reference number clock and resample and store, the compensation of code clock Doppler has been finished in resampling herein at local spreading code.The correlation computations submodule is read spreading code corresponding to each frequency slots with high-frequency clock from memory, with carried out the signal after the frequency compensation and carried out correlation computations, switch to next frequency slots after finishing the correlation computations of a frequency slots, the result of calculation of all frequency slots is sent into the correlated results comparison sub-module, the correlated results comparison sub-module compares the correlated results of different code phases in each frequency slots, and from the correlated results of all frequency slots, select peak-peak, the corresponding frequency of this peak value and phase place are exactly the final result that catches.In whole acquisition procedure, adopt local counter with twice code clock the used clock of acquisition procedure to be counted, catch finish after handle catch the result and local rolling counters forward value is given carrier wave and code tracking module together.
The spread spectrum code acquisition module is caught baseband signal from spreading code phase place and doppler frequency two aspects, catches the spreading code phase place that obtains and doppler frequency gives carrier wave with local rolling counters forward value and the code tracking module guides carrier tracking loop and code tracking loop to enter lock-out state; Carrier tracking loop and code tracking loop Output rusults are sent into the recovery that demodulation module carries out data; The range finder module that tests the speed is finished speed and range measurement to the observing and controlling target 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 among Fig. 1 and has divided, this spread spectrum code acquisition module, comprise the down-sampled submodule and the form to connect that gather baseband signal, by the data sub module stored, the read data submodule, the frequency compensation submodule, spreading code produces submodule, the correlation computations submodule is connected successively, to catch the result and output to the correlated results comparison sub-module of carrier wave and code tracking module, also comprise the frequency slots control submodule of crosslinked frequency compensation submodule and through spreading code resampling submodule, the spreading code sub module stored, read the closed loop that the spreading code submodule forms by correlation computations submodule annular rate of connections groove control submodule, and the local counter that links to each other with frequency slots control submodule.
Catching of spread spectrum code acquisition module spreading code is to carry out yard correction of Doppler frequency deviation by the spreading code that produces in this locality to adapt to the code clock deviation that exists in the sampled signal, be the storage data after down-sampled are carried out doppler frequency compensation, once whole acquisition procedure is finished in sampling.The specific implementation step is divided into local spreading code generation, data sampling storage and three parts of correlation computations.
For local spreading code and the Doppler of the spreading code in the signal are adapted, before catching beginning, need in advance ready-portioned frequency slots of basis, produce the spreading code that is complementary with each frequency slots in this locality, specifically comprise following steps:
(1) spreading code produces: before acquisition procedure begins, produce with each frequency slots accordingly with the spreading code of Doppler frequency deviation according to the frequency slots of dividing in advance.
(2) spreading code resamples: with benchmark twice code clock the spreading code that spreading code generation submodule produces is resampled, sampled result is given the spreading code sub module stored and is stored.
(3) spreading code storage: the spreading code sub module stored deposits the spreading code after resampling in the spreading code memory in the twice spread-spectrum code rate, and memory length equals total relevant counting.
Catching at the beginning, at first the baseband signal that receives is being sampled, sampling process comprises following steps:
(1) base band data is down-sampled: down-sampled submodule extracts with the baseband signal of twice spread-spectrum code rate to input after acquisition procedure begins, and the signal after the extraction is given the data sub module stored and stored.
(2) data storage: the data sub module stored deposits the baseband signal after down-sampled in the data storage in the twice spread-spectrum code rate, and the storage data length equals total relevant counting.
After finishing local spreading code and receiving the storage of signal, carry out correlation computations to storing the local spreading code of finishing and receiving signal.The correlation computations process comprises following steps:
(1) sampled data reads: the read data submodule is read the complete base band data of storage from data storage with high-frequency clock, gives the frequency compensation submodule and carries out the compensation of carrier wave doppler frequency.
(2) carrier wave Doppler compensation: the frequency compensation submodule carries out the doppler frequency compensation according to the current frequency slots parameter that frequency slots control submodule is sent here to the data of reading from data storage.
(3) spreading code reads: read the current frequency slots parameter that the spreading code submodule sends here according to frequency slots control submodule and read the spreading code corresponding with this frequency slots with high-frequency clock from the spreading code memory.
(4) correlation computations: read the spreading code that the spreading code submodule reads, and carried out the sampled data after the frequency compensation and give the correlation computations submodule and carry out correlation computations.
(5) frequency slots is switched: after the correlation computations submodule is finished the phase calculation of all spreading codes in the frequency slots, the switching mark that frequency slots control submodule is sent here according to the correlation computations submodule switches to next frequency slots, until finish the correlation computations process of all frequency slots.
(6) correlation is selected: the correlated results comparison sub-module is selected maximum from the correlated results of all frequency slots, the spreading code phase place that this maximum is corresponding and frequency values are exactly the final result that catches.
(7) acquisition procedure counting: in whole acquisition procedure, adopt local counter with twice code clock the used clock of acquisition procedure to be counted, catch finish after handle catch the result and local rolling counters forward value is given carrier wave and code tracking module together.
Claims (10)
1. one kind is reduced the large dynamically method of lower spread spectrum code acquisition time, it is characterized in that comprising the steps: at first the spread spectrum code acquisition module that between the AD sampling of direct sequence spread spectrum observing and controlling receiver and down conversion module and carrier wave and code tracking module, links to each other, secondly the range finder module that tests the speed in parallel between carrier wave and code tracking module and demodulation module; The spread spectrum code acquisition module is with the reduce sampling frequency of 2 times of spread-spectrum code rates, the baseband digital signal that receiver is received carries out down-sampled, baseband signal after down-sampled deposits in the data storage, then from memory, read base band data with the read data submodule with high-frequency clock, and send into the frequency compensation submodule and carry out the compensation of carrier wave doppler frequency; According to the current frequency slots parameter of frequency slots control submodule, produce corresponding code clock and promote the generation of spreading code generator with the spreading code of Doppler frequency deviation, the spreading code that the different frequency groove produces is resampled with twice reference number clock with the spreading code sub module stored again, spreading code after the resampling deposits in the spreading code memory, the correlation computations module is read spreading code corresponding to each frequency slots with high-frequency clock from memory, with carried out after the signal after the frequency compensation carries out the correlation computations of a frequency slots, switch to next frequency slots, at last the result of calculation of all frequency slots is sent into the correlated results comparison sub-module, the correlated results comparison sub-module compares the correlated results of receiving, from the correlated results of all frequency slots, select maximum correlation, with the corresponding pseudo-code phase of this correlation and Doppler as the final result that catches.
2. by the large dynamically method of lower spread spectrum code acquisition time of minimizing claimed in claim 1, it is characterized in that, the spread spectrum code acquisition module is caught baseband signal from spreading code phase place and doppler frequency two aspects, catch the spreading code phase place and the doppler frequency that obtain and give carrier wave and code tracking module with local rolling counters forward value, guiding carrier tracking loop and code tracking loop enter lock-out state; Carrier tracking loop and code tracking loop Output rusults are sent into the recovery that demodulation module carries out data; The range finder module that tests the speed is finished speed and range measurement to the observing and controlling target according to the Output rusults of carrier tracking loop and code tracking loop and demodulation module.
3. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, the spread spectrum code acquisition module, comprise the down-sampled submodule and the form to connect that gather baseband signal, by the data sub module stored, the read data submodule, the frequency compensation submodule, spreading code produces submodule, the correlation computations submodule is connected successively, to catch the result and output to the correlated results comparison sub-module of carrier wave and code tracking module, also comprise the frequency slots control submodule of crosslinked frequency compensation submodule and through spreading code resampling submodule, the spreading code sub module stored, read the closed loop that the spreading code submodule forms by correlation computations submodule annular rate of connections groove control submodule, and the local counter that links to each other with frequency slots control submodule.
4. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, the frequency slots control module is divided frequency slots according to the Doppler frequency deviation region, the division of frequency slots takes into account carrier wave Doppler and code clock Doppler, within total time of integration, the spreading code phase deviation between the side frequency groove is no more than half-chip.
5. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, the spreading code that the compensation of code clock Doppler produces in this locality carries out, and be first the baseband signal after the down-conversion to be carried out down-sampledly, and then minute frequency slots is carried out doppler frequency compensation to the signal after down-sampled.
6. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, catching of spread spectrum code acquisition module spreading code is by on the spreading code that produces in this locality, carry out yard correction of Doppler frequency deviation and adapt to the code clock deviation that exists in the sampled signal, be the storage data after down-sampled are carried out doppler frequency compensation, once whole acquisition procedure is finished in sampling.
7. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, base band data is down-sampled to be that down-sampled submodule extracts with the baseband signal of twice spread-spectrum code rate to input, and the signal after the extraction is given the data sub module stored and stored.
8. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, the data storage is that the data sub module stored deposits the baseband signal after down-sampled in the data storage in the twice spread-spectrum code rate, and the storage data length equals total relevant counting.
9. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, it is with benchmark twice code clock the spreading code that spreading code generation submodule produces to be sampled that spreading code resamples, and sampled result is given the spreading code sub module stored and stored.
10. by claim 1 or the large dynamically method of lower spread spectrum code acquisition time of 2 described minimizings, it is characterized in that, the spreading code storage is that the spreading code sub module stored deposits the spreading code after resampling in the spreading code memory in the twice spread-spectrum code rate, and memory length equals total relevant counting.
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| 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 |
| CN108055058A (en) * | 2017-11-22 | 2018-05-18 | 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 high-precision measuring method of carrier doppler and its change rate |
| CN108226968A (en) * | 2018-01-03 | 2018-06-29 | 电子科技大学 | A kind of navigation signal quick capturing method |
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| 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 |
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