Improved spread spectrum signal acquisition algorithm
A spread spectrum signal and improved technology, applied in satellite radio beacon positioning systems, measurement devices, instruments, etc., can solve the problems of mutual restriction of acquisition speed and acquisition accuracy, unsatisfactory algorithm, and unguaranteed frequency acquisition accuracy. , to achieve the effect of improving the capture accuracy and improving the capture accuracy
Inactive Publication Date: 2019-11-05
BEIJING BBEF SCI & TECH
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But in this way, the frequency capture accuracy cannot be guaranteed, therefore, the algorithm has the defect that the capture speed and capture precision are mutually restricted
This algorithm is not ideal in cases where follow-up requirements are strict
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[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0029] like figure 2 As shown, an improved spread spectrum signal acquisition algorithm includes the following steps:
[0030] 1) First use the fast acquisition method based on the frequency domain circular shift to perform rough capture on the signal, and obtain the rough search results of the code phase and Doppler frequency;
[0031] 2) Use the obtained code phase coarse capture result to perform pseudo-code stripping on the received signal;
[0032] 3) According to the final capture accuracy requirement, set the final number of iterations K, and select the Doppler value f of the coarse capture in step 1) r For the reference frequency, perform the first iteration;
[0033] 4) Let the frequency interval f k = f res / 2 k , k=1, 2, 3, ... K;
[0034] 5) Locally generated three frequency values are f...
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The invention discloses an improved spread spectrum signal acquisition algorithm. The improved spread spectrum signal acquisition algorithm comprises the following steps that 1) a signal is coarsely acquired by using a frequency domain circumferential shift acquisition method; 2) pseudo code stripping is performed on the received signal by using an obtained code phase coarse acquisition result; 3)an iteration frequency is set; 4) frequency space is set; 5) three carriers of different frequency values are locally generated; 6) the received carriers with pseudo code stripping are correlated with three locally copied carriers of different frequencies; 7) three obtained correlated results are compared, the maximum correlation value is found, and then a reference frequency is updated to be a locally copied frequency value corresponding to the maximum correlation value; 8) next-time iteration is performed, when the cumulative number of the iterations is less than or equal to K, step 4) is repeated; otherwise, the algorithm is terminated, the updated frequency value is output, and the frequency value is a refined Doppler frequency value. Tests show that the acquisition accuracy of the Doppler frequency after fine acquisition is greatly improved.
Description
technical field [0001] The invention relates to the technical field of wireless measurement and control communication, in particular to an improved spread spectrum signal acquisition algorithm. Background technique [0002] The development of modern information technology is getting faster and faster, and the satellite navigation industry has also achieved unprecedented development. Acquisition, as a key technology in satellite navigation system, has always been the focus of research in related fields at home and abroad. [0003] In the spread spectrum communication system, affected by the Doppler effect caused by the transmission delay and the receiver carrier speed, etc., the mathematical model of the direct spread received signal taking the GPS signal as an example is generally as follows: [0004] r(t)=Ad(t)c(t-τ)cos(2π(f 0 +f d )t)+n(t) [0005] In the above formula, A is the signal amplitude, d(t) represents the navigation message or data information, τ is the pseu...
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IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 杜旭琴张守忠
Owner BEIJING BBEF SCI & TECH