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Complex signal phase-based bit reversal-prevention rapid capture method

A bit inversion, complex signal technology, applied in the field of communication

Active Publication Date: 2019-01-18
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of improving the speed of the acquisition method in the case of data bit inversion, and provide a fast and accurate estimation of the code phase and frequency of the GNSS signal, so as to realize the rapid anti-bit inversion based on the complex signal phase. capture method

Method used

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  • Complex signal phase-based bit reversal-prevention rapid capture method
  • Complex signal phase-based bit reversal-prevention rapid capture method
  • Complex signal phase-based bit reversal-prevention rapid capture method

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Embodiment Construction

[0055] Such as figure 1 As shown, a fast anti-bit reversal fast acquisition method based on complex signal phase is characterized in that it comprises the following steps:

[0056] S1. Perform down-conversion processing on the received signal R(n), and block the local correlation signal and the received signal to obtain the block matrix and Among them, i represents the i-th integration time, D represents the local pseudo-random code when there is data bit influence, ND represents the local pseudo-random code when there is no data bit influence, M and 2N represent the number of rows and columns of the matrix, respectively.

[0057] The received signal R(n) is:

[0058]

[0059] Among them, q is the code phase of the received signal, f d is the Doppler frequency, C() is the pseudo-random code, D() is the modulation data, f s is the sampling frequency, p(n) means that both the real part and the imaginary part obey the mean value of 0 and the variance of σ 2 Gaussian noi...

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Abstract

The invention mainly discloses a complex signal phase-based bit reversal-prevention rapid capture method. According to the method, down frequency conversion is carried out on a received signal and blocking is carried out on local related signals and the received signal to obtain a matrix; code phase search processing is carried out on the obtained matrix to obtain a to-be-detected variable; coherent integral detection is carried out to obtain a coherent integral value of the code phase search processing; code phase processing is carried out on the received signal to obtain a to-be-detected variable of the code phase processing; position reversal is carried out on obtained estimated bit data; coherent integral detection is carried out again to finally obtain a to-be-solved parameter code phase; and finally an estimated capture parameter ode phase and a frequency are obtained, so that the rapid capture of GNSS signals is realized. The method is capable of rapidly and accurately estimating code phases, so as to realize the estimation of capture parameters under the condition of bit symbol reversal.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a fast anti-bit inversion fast acquisition method based on complex signal phase. Background technique [0002] With the advancement of science and technology, wireless communication technology and global satellite positioning system (GPS) technology are increasingly used in all aspects of daily life. Among them, the global navigation satellite system (Global Navigation Satellite System, abbreviated as GNSS), its positioning is obtained by using observations such as pseudorange, ephemeris, and satellite launch time of a group of satellites, and the user's clock error must also be known. A satellite navigation receiver acquires and tracks the signals of multiple GNSS satellites and then demodulates the navigation data modulated therein. The satellite navigation receiver uses the ranging code to calculate the relative distance between the GNSS satellite and the us...

Claims

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 吴超孙闽红刘二小滕旭阳简志华钟华苏明坤乔磊仇兆炀宋慧娜汪立新
Owner HANGZHOU DIANZI UNIV
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