Fast capturing method of direct sequence spread spectrum signal

A direct sequence spread spectrum, signal technology, applied in electrical components, transmission systems, etc., can solve the problems of flooding, difficult to meet the needs of high dynamic and fast acquisition, and difficult to detect direct sequence spread spectrum signals.

Active Publication Date: 2017-09-05
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

Since the bandwidth of the direct sequence spread spectrum signal is much larger than the bandwidth of the baseband signal, the energy is distributed in a wider frequency band, and the power spectral density is so low that it is usually submerged in the noise
It is precisely because of these chara

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  • Fast capturing method of direct sequence spread spectrum signal
  • Fast capturing method of direct sequence spread spectrum signal
  • Fast capturing method of direct sequence spread spectrum signal

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[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0027] figure 1 Shown is a typical block diagram of the implementation of direct sequence spread spectrum signal fast capture technology, which includes time domain parallel and Doppler coarse capture module 1 and Doppler fine capture module 2. Among them, the time domain parallel and Doppler coarse capture module 1 uses a parallel code phase search algorithm to complete the code phase and Doppler frequency shift coarse capture (that is, the first stage capture processing). The time-domain parallel and Doppler rough capture module 1 includes a zero padding unit 101, a pseudo-code generator 102, an FFT unit 103, a complex conjugate transform 104, a cyclic shift unit 105, an IFFT unit 106, a modulus processing unit 107, a ...

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Abstract

The invention discloses a fast capturing method of a direct sequence spread spectrum signal, and belongs to the technical field of the spread spectrum signal receiving processing. The method comprises the following steps: acquiring a sampling frequency of a direct sequence spread spectrum discrete complex signal and an output rate of a local pseudo code signal, Doppler rough capturing and Doppler fine capturing. The capturing of the direct spread signal is divided into two stages of rough capturing and fine capturing, wherein the first stage is to realize the capturing of the pseudo code phase and the Doppler frequency shift rough capturing result based on a parallel code phase search algorithm; the second stage is to realize the Doppler fine capturing on the carrier frequency based on the segment correlation and the Fourier transformer technology. By use of the capturing method at the two stages, the fast capturing and parameter estimation of the signal can be realized in the premise of lower signal-to-noise ratio tolerance and high dynamic search range, and the method is the important improvement of the prior art.

Description

Technical field [0001] The invention belongs to the technical field of spread spectrum signal receiving and processing, and in particular relates to a method for quickly acquiring a direct sequence spread spectrum signal. Background technique [0002] Direct sequence spread spectrum (“direct spread”) technology has good confidentiality, flexible channel allocation capabilities, and strong resistance to multipath and multiple access interference. It is used in personal communication networks, wireless local area networks, mobile communications, satellite communications, and It is widely used in military and tactical communications. Since the bandwidth of the direct sequence spread spectrum signal is much larger than the bandwidth of the baseband signal, the energy is distributed in a wider frequency band, and the power spectral density is so low that it is usually submerged in noise. It is precisely because of these characteristics that the direct sequence spread spectrum signal ...

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Application Information

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IPC IPC(8): H04B1/707H04B1/7075H04B1/7077
CPCH04B1/707H04B1/7075H04B1/70758H04B1/7077
Inventor 杨再秀杨丽云郑晓冬
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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