CN103929215A - Efficient MSK direct spread communication detecting method - Google Patents
Efficient MSK direct spread communication detecting method Download PDFInfo
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- CN103929215A CN103929215A CN201410186536.7A CN201410186536A CN103929215A CN 103929215 A CN103929215 A CN 103929215A CN 201410186536 A CN201410186536 A CN 201410186536A CN 103929215 A CN103929215 A CN 103929215A
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Abstract
The invention discloses an efficient MSK direct spread communication detecting method. The method comprises the steps that firstly, a non-cooperative receiver searches for, monitors and samples related frequency bands, an internal high-speed processing chip carries out segmentation self-correlation and square operation on sampling data, the processed sampling data are accumulated to reduce the adverse effect of noise, and the value of a symbol period Ts is estimated by searching for peak values of an accumulation sequence and calculating the interval between adjacent peak values; secondly, delay multiplying, high pass, fast Fourier transform and other processing are carried out on a receiving signal to estimate the time width Tc of an MSK spread spectrum system chip; thirdly, on the basis of the analysis and process, the Tc delay multiplying, low pass, Hilbert transform, Ts window sliding observing and other analyzing processing are carried out on the receiving signal, and a spread spectrum pseudorandom sequence of the spread spectrum system can be estimated. The needed operations are easy to process, detecting speed is high, and the method can meet the requirement for non-cooperative communication detecting.
Description
Technical field
The present invention relates to a kind of MSK direct-sequence spread-spectrum communication efficient detection method.
Background technology
The non-cooperative detection processing method of existing MSK direct-sequence spread-spectrum communication feature is as follows: 1 carries out analyzing and processing for baseband signal to a great extent, inevitably exists the non-cooperative detection of MSK spread spectrum communication existing intrinsic difficult problem aspect carrier extract and Phase Tracking; 2 Check processings are failed the gain that effectively utilizes the blind despreading of unknown MSK spread-spectrum signal to bring; 3 adopt the method for Higher Order Cumulants, Cyclic Spectrum or matrix decomposition to extract signal characteristic, and amount of calculation is large, and it is large that Check processing is implemented difficulty; 4 use orthogonal shunt Check processing method to implement to realize the impact that is subject to many factors.
Prior art exists defect to need to improve.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new MSK direct-sequence spread-spectrum communication efficient detection method.
Technical scheme of the present invention is as follows: a kind of MSK direct-sequence spread-spectrum communication efficient detection method, and specific implementation step is as follows:
One, monitor that detecting receiver scans target frequency bands, carries out just sampling to the signal of the system of entering;
Two, sampled data is also carried out respectively to auto-correlation computation by regular hour window width segmentation;
Three, the correlated series of each section of sampled data is squared by sequence respectively, and sequentially row are cumulative level and smooth;
Four, the sequence peak value of the cumulative level and smooth sequence of search, according to the interval estimate symbol cycle T s between two adjacent peak values;
Five, the sample sequence of " step 1 " gained is carried out to delay multiplication computing;
Six, the result of delay multiplication is done to high-pass filtering processing, the signal after filtering is carried out to Fourier transform simultaneously and obtain frequency domain data;
Seven, the discrete spectral line of search frequency domain data sequence, the inverse at the interval between two spectral lines equals the chip width Tc of potential MSK direct-sequence spread-spectrum communication signal;
Eight, obtain the big or small sample sequence to " step 1 " gained according to the chip width Tc estimated value of " step 7 " and do the processing of Tc delay multiplication;
Nine, the result of Tc delay multiplication processing is done to low-pass filtering and Hilbert conversion process;
Ten, the instantaneous phase sequence that low-pass signals institute may correspondence is estimated in many data aggregates;
11, estimate to determine instantaneous phase sequence observation window width according to the symbol period Ts of " step 4 ", analyze the Relative Transformation sequence of the spread spectrum pseudo random sequence that obtains MSK direct-sequence spread-spectrum communication by instantaneous phase sequence is implemented to slip paired observation;
12, according to or the inverse operation of logic estimate to recover the spread spectrum pseudo random sequence of MSK direct-sequence spread-spectrum communication, thereby complete detection to MSK direct-sequence spread-spectrum communication and the estimation of key parameter.
Beneficial effect, adopts such scheme, 1) directly band signal is done to auto-correlation and delay multiplication processing, avoid MSK spread spectrum communication to detect an existing intrinsic difficult problem aspect carrier extract and phase capturing tracking;
2) be correlated with and smoothly slacken the impact of noise with many segmentation accumulations by segmentation, greatly improved the low signal-to-noise ratio adaptability of Check processing;
3) detect and implement without any need for prior information, entirely propose and extremely strong distinguishing ability with the robustness of algorithm self with for the characteristic feature of MSK spread spectrum communication;
4) realize for the detection of MSK direct-sequence spread-spectrum communication and find and complete the estimation for core parameter symbol period, chip width and spread spectrum pseudo random sequence by the comprehensive transformational analysis in time-frequency domain, Hilbert transform territory;
5) make full use of the similitude of MSK spread spectrum communications signals self, adopt processing such as segmentation is relevant, delay multiplication to show detected object feature especially, adapt to " the unknown " and " blind processing " requirement that non-collaboration communication detects;
6) convert to estimate the instantaneous phase of unknown signaling base band composition by ingenious use low pass and Hilbert, required calculation process is simple, is convenient to software and hardware and realizes;
7) analytic representation of combining multiple data carries out instantaneous phase extraction taking chip as unit, instead of extracts instantaneous feature according to single data, has reduced to the utmost the adverse effect of noise;
8) type of the spread spectrum pseudo random sequence that Check processing adopts for MSK direct-sequence communications system does not limit, and the length of sequence used is not limited;
9) whole Check processing has been avoided the decomposition computation of matrix and computing capability has been required to the computational problem of high Cyclic Statistics, greatly reduces the requirement for receiver disposal ability;
10) in detection to MSK direct-sequence spread-spectrum communication is implemented, can exchange by proper extension observing time and the mode that increases analyzing and processing data sample size the improvement of signal to noise ratio for, adapt to low signal-to-noise ratio and the uncertain requirement of signal to noise ratio that non-cooperation spread spectrum communication detects.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
For the ease of understanding the present invention, below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.In this specification and accompanying drawing thereof, provided preferred embodiment of the present invention, still, the present invention can realize in many different forms, is not limited to the described embodiment of this specification.On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present invention more thoroughly comprehensively.
The invention provides a kind of serial MSK direct-sequence spread-spectrum communication efficient detection and method for parameter estimation, non-cooperative reception square tube is crossed the estimation that the multi-domain processing analysis of receiver output signal is realized to the important parameter such as detection and system spread-spectrum sequence to destinations traffic.Its specific implementation mainly comprises the following steps: first, non-cooperative reception machine carries out search surveillance, sampling to relevant frequency range, inner high speed process chip is done sampled data after segmentation auto-correlation and square operation cumulative with smooth noise adverse effect, afterwards the peak value by search accumulated sequence and calculate the value of the interval estimate symbol cycle T s between adjacent peak value; Secondly, process by doing to received signal delay multiplication, high pass, fast Fourier transform etc. the estimation realizing MSK spread spectrum system chip width Tc; Last on the basis of above-mentioned analyzing and processing, realize the estimation to spread spectrum system spread spectrum pseudo random sequence by making to received signal the analyzing and processing such as Tc delay multiplication, low pass, Hilbert conversion, Ts window slip observation.Invention advantage: the processing of each step is all strictly for essential principle and the characteristic feature of MSK direct-sequence spread-spectrum communication, and required calculation process is simple, and the speed of reaching detection is fast, can adapt to non-collaboration communication and detect needs.
As shown in Figure 1, one embodiment of the present of invention are, a kind of MSK direct-sequence spread-spectrum communication efficient detection method, and specific implementation step is as follows:
One, monitor that detecting receiver scans target frequency bands, carries out just sampling to the signal of the system of entering;
Two, sampled data is also carried out respectively to auto-correlation computation by regular hour window width segmentation;
Three, the correlated series of each section of sampled data is squared by sequence respectively, and sequentially row are cumulative level and smooth;
Four, the sequence peak value of the cumulative level and smooth sequence of search, according to the interval estimate symbol cycle T s between two adjacent peak values;
Five, the sample sequence of " step 1 " gained is carried out to delay multiplication computing;
Six, the result of delay multiplication is done to high-pass filtering processing, the signal after filtering is carried out to Fourier transform simultaneously and obtain frequency domain data;
Seven, the discrete spectral line of search frequency domain data sequence, the inverse at the interval between two spectral lines equals the chip width Tc of potential MSK direct-sequence spread-spectrum communication signal;
Eight, obtain the big or small sample sequence to " step 1 " gained according to the chip width Tc estimated value of " step 7 " and do the processing of Tc delay multiplication;
Nine, the result of Tc delay multiplication processing is done to low-pass filtering and Hilbert conversion process;
Ten, the instantaneous phase sequence that low-pass signals institute may correspondence is estimated in many data aggregates;
11, estimate to determine instantaneous phase sequence observation window width according to the symbol period Ts of " step 4 ", analyze the Relative Transformation sequence of the spread spectrum pseudo random sequence that obtains MSK direct-sequence spread-spectrum communication by instantaneous phase sequence is implemented to slip paired observation;
12, according to or the inverse operation of logic estimate to recover the spread spectrum pseudo random sequence of MSK direct-sequence spread-spectrum communication, thereby complete detection to MSK direct-sequence spread-spectrum communication and the estimation of key parameter.
Beneficial effect, adopts such scheme, 1) directly band signal is done to auto-correlation and delay multiplication processing, avoid MSK spread spectrum communication to detect an existing intrinsic difficult problem aspect carrier extract and phase capturing tracking;
2) be correlated with and smoothly slacken the impact of noise with many segmentation accumulations by segmentation, greatly improved the low signal-to-noise ratio adaptability of Check processing;
3) detect and implement without any need for prior information, entirely propose and extremely strong distinguishing ability with the robustness of algorithm self with for the characteristic feature of MSK spread spectrum communication;
4) realize for the detection of MSK direct-sequence spread-spectrum communication and find and complete the estimation for core parameter symbol period, chip width and spread spectrum pseudo random sequence by the comprehensive transformational analysis in time-frequency domain, Hilbert transform territory;
5) make full use of the similitude of MSK spread spectrum communications signals self, adopt processing such as segmentation is relevant, delay multiplication to show detected object feature especially, adapt to " the unknown " and " blind processing " requirement that non-collaboration communication detects;
6) convert to estimate the instantaneous phase of unknown signaling base band composition by ingenious use low pass and Hilbert, required calculation process is simple, is convenient to software and hardware and realizes;
7) analytic representation of combining multiple data carries out instantaneous phase extraction taking chip as unit, instead of extracts instantaneous feature according to single data, has reduced to the utmost the adverse effect of noise;
8) type of the spread spectrum pseudo random sequence that Check processing adopts for MSK direct-sequence communications system does not limit, and the length of sequence used is not limited;
9) whole Check processing has been avoided the decomposition computation of matrix and computing capability has been required to the computational problem of high Cyclic Statistics, greatly reduces the requirement for receiver disposal ability;
10) in detection to MSK direct-sequence spread-spectrum communication is implemented, can exchange by proper extension observing time and the mode that increases analyzing and processing data sample size the improvement of signal to noise ratio for, adapt to low signal-to-noise ratio and the uncertain requirement of signal to noise ratio that non-cooperation spread spectrum communication detects.
It should be noted that, above-mentioned each technical characterictic continues combination mutually, forms the various embodiment that do not enumerate in the above, is all considered as the scope that specification of the present invention is recorded; And, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (1)
1. a MSK direct-sequence spread-spectrum communication efficient detection method, is characterized in that, specific implementation step is as follows:
One, monitor that detecting receiver scans target frequency bands, carries out just sampling to the signal of the system of entering;
Two, sampled data is also carried out respectively to auto-correlation computation by regular hour window width segmentation;
Three, the correlated series of each section of sampled data is squared by sequence respectively, and sequentially row are cumulative level and smooth;
Four, the sequence peak value of the cumulative level and smooth sequence of search, according to the interval estimate symbol cycle T s between two adjacent peak values;
Five, the sample sequence of " step 1 " gained is carried out to delay multiplication computing;
Six, the result of delay multiplication is done to high-pass filtering processing, the signal after filtering is carried out to Fourier transform simultaneously and obtain frequency domain data;
Seven, the discrete spectral line of search frequency domain data sequence, the inverse at the interval between two spectral lines equals the chip width Tc of potential MSK direct-sequence spread-spectrum communication signal;
Eight, obtain the big or small sample sequence to " step 1 " gained according to the chip width Tc estimated value of " step 7 " and do the processing of Tc delay multiplication;
Nine, the result of Tc delay multiplication processing is done to low-pass filtering and Hilbert conversion process;
Ten, the instantaneous phase sequence that low-pass signals institute may correspondence is estimated in many data aggregates;
11, estimate to determine instantaneous phase sequence observation window width according to the symbol period Ts of " step 4 ", analyze the Relative Transformation sequence of the spread spectrum pseudo random sequence that obtains MSK direct-sequence spread-spectrum communication by instantaneous phase sequence is implemented to slip paired observation;
12, according to or the inverse operation of logic estimate to recover the spread spectrum pseudo random sequence of MSK direct-sequence spread-spectrum communication, thereby complete detection to MSK direct-sequence spread-spectrum communication and the estimation of key parameter.
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| CN104821836A (en) * | 2015-04-26 | 2015-08-05 | 复旦大学 | Improved zero-padding and frequency domain sampling-combined PN code fast acquisition algorithm |
| CN111835668A (en) * | 2020-08-05 | 2020-10-27 | 成都盟升科技有限公司 | Simplified non-coherent despreading and demodulating method for MSK spread spectrum system |
| CN114337726A (en) * | 2021-12-30 | 2022-04-12 | 青岛上合航天科技有限公司 | Spread spectrum code capturing method and device and computer readable storage medium |
| CN115396269A (en) * | 2022-08-26 | 2022-11-25 | 天津津航计算技术研究所 | Carrier parameter estimation method and system suitable for burst communication |
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| CN115396269A (en) * | 2022-08-26 | 2022-11-25 | 天津津航计算技术研究所 | Carrier parameter estimation method and system suitable for burst communication |
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Application publication date: 20140716 |