Blind estimation method of boc signal parameters based on average ambiguity function
A fuzzy function and signal estimation technology, which is applied to baseband system components, satellite radio beacon positioning systems, measurement devices, etc., can solve the problems of not being able to estimate the pseudo-code period at the same time, a large amount of calculation, and large transmission errors, etc., to overcome The operation is complex and the pseudo-code cycle cannot be estimated at the same time, the calculation amount is small, and the effect of improving the processing gain
Active Publication Date: 2018-04-20
CHONGQING UNIV OF POSTS & TELECOMM
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[0005] The technical problem to be solved by the present invention is to solve the problem of blind estimation of BOC signal parameters by proposing a method based on the average ambiguity function, aiming at the defects of large transmission error and large amount of calculation in the estimation of BOC signal parameters in the prior art
This method can simultaneously estimate multiple parameters of BOC signal carrier frequency, subcarrier rate, pseudo-code rate and pseudo-code period, and overcomes the problems that the spectral correlation method is complex in operation and cannot estimate the pseudo-code period at the same time
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[0022] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.
[0023] The BOC signal model is established as:
[0024] in, a m is the information code, the value is ±1, T a is the symbol period, is the duration T a of rectangular pulses. b l is a pseudocode that repeats at a period L, T b is the pseudo-chip width, is the duration T b the rectangular pulse, is a square wave subcarrier generated by a sinusoidal phase, and its period is 2T s , the pseudocode rate is R c =1 / T b , the subcarrier rate is R s =1 / (2T s ), N is the modulation order, which can be expressed as N=2R s / R c , which is the number of half periods of the subcarrier within the width of a pseudocode symbol, f 0 is the carrier frequency. Therefore, the BOC baseband signal can be expressed as:
[0025]
[0026] Among them, d n is the product of information code, pseudo code and subcarrier, and ...
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The invention claims a method for jointly estimating parameters of a BOC signal based on an average fuzzy function, which belongs to the technical field of signal processing. After processing the average ambiguity function of the BOC signal, it shows a strong signal component in parameters such as carrier frequency, subcarrier chip rate, pseudo code rate and pseudo code period. From this feature, the carrier frequency of the BOC signal, the subcarrier Carrier rate, pseudo-code rate and pseudo-code period are jointly estimated. At the same time, the processing gain of the algorithm can be further improved by accumulating and averaging the average ambiguity functions of multi-segment signals. The calculation amount of the algorithm is relatively small, the estimation accuracy is good, and it overcomes the problem of complex nonlinear operation of the spectral correlation method and the problem of inability to estimate the period of the pseudo-code. This method can accurately estimate multiple parameters of the BOC signal under low signal-to-noise ratio, so it is of great significance for the subsequent processing of the signal and the analysis of subtle features (subcarrier type identification, pseudo-code sequence estimation).
Description
technical field [0001] The present invention relates to navigation communication signal processing, specifically a kind of binary offset carrier modulation (Binary-Offset-Carrier, BOC) signal carrier frequency, subcarrier rate, pseudo-code rate and pseudo-code cycle parameter blind estimation based on average ambiguity function question. Background technique [0002] In the new generation of satellite navigation systems Galileo and GPS, as well as my country's Beidou satellite, BOC and derivative BOC signal technology are widely used. Because this technology can make the system have better capture and tracking performance and higher positioning and navigation accuracy, it is favored by various navigation countries. According to the latest Galileo spatial signal interface control document, 8 out of 10 Galileo navigation signals use BOC signals or derivative BOC signals. The BOC signal moves the peak at the center frequency of the power spectrum of the original PSK (phase ke...
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IPC IPC(8): G01S19/37H04L25/02
Inventor 张天骐阳锐张刚刘瑜吴旺军李灿
Owner CHONGQING UNIV OF POSTS & TELECOMM