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Method for reducing capturing time of spreading code in large dynamic range

A technology of capture time and spread spectrum code, applied in electrical components, transmission systems, etc., can solve the problems of long capture time, shortened capture time, and poor adaptability to rapid Doppler changes, so as to achieve fast capture, reduce capture time, and avoid The effect of multiple oversampling

Inactive Publication Date: 2013-05-01
10TH RES INST OF CETC
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Problems solved by technology

[0005] The purpose of the present invention is to provide a spread spectrum that adapts to a large dynamic range and can significantly shorten the capture time for the problems of long capture time and poor adaptability to rapid changes in Doppler in the large dynamic direct sequence spread spectrum system in the prior art code capture method

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  • Method for reducing capturing time of spreading code in large dynamic range
  • Method for reducing capturing time of spreading code in large dynamic range

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Embodiment Construction

[0012] Refer to figure 1 , figure 2 . In the preferred embodiment of the present invention described below, the receiver used in the direct sequence spread spectrum measurement and control system consists of an AD sampling and downconversion module, a spread code acquisition module, a carrier and code tracking module, which are connected in series on the same line. The demodulation module and the speed and distance measurement module connected between the carrier and code tracking module and the demodulation module are composed of 5 parts. Among them, the AD sampling and down-conversion module completes the digital processing of the analog signal and converts the analog signal into a baseband digital signal for subsequent processing. According to the method of the present invention for reducing the acquisition time of the spread spectrum code under large dynamics, firstly, the received baseband signal is down-sampled, the down-sampling rate is twice the spread-spectrum code r...

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Abstract

The invention provides a method for reducing capturing time of a spreading code in a large dynamic range and aims to provide a spreading code capturing method which is large in dynamic application range and can obviously shorten the capturing time. The technical scheme for realizing the method comprises the following steps of firstly, performing down-sampling and storage on baseband data subjected to down-conversion at two-time spreading code speed, reading stored data from a storage by a high-speed clock, dividing a frequency channel according to a Doppler frequency offset range, and performing Doppler frequency compensation on the read data according to the center frequency of each frequency channel; secondly, generating the corresponding spreading codes in the local place according to a code clock subjected to Doppler frequency compensation and corresponding to each frequency channel, and sampling and storing the spreading codes generated by different frequency channels by a two-time standard code clock; and finally, reading the spreading code corresponding to each frequency channel from the storage by the high-speed clock, and performing correlation calculation on the spreading codes and a signal subjected to the Doppler frequency compensation, wherein the pseudo-code phase and the Doppler which correspond to the highest correlation value are the final capturing result.

Description

Technical field [0001] The invention relates to a method for acquiring a spread spectrum sequence of a direct sequence spread spectrum system. It is mainly used for digital baseband equipment of direct sequence spread spectrum system. The Doppler range is above ±1MHz, and the Doppler change rate is above 100KHz / S. The rapid acquisition of the spread spectrum code of direct sequence spread spectrum system under large dynamic conditions. Background technique [0002] Spread spectrum communication is one of the most extensively studied communication systems in the field of communication in the 21st century. Especially in today's increasingly complex channel environment and the social demand environment where personal communication is attracting more attention, the excellent confidentiality and anti-noise performance of spread spectrum communication is very important. In the entire spread spectrum system, the receiver's acquisition of the transmitter's spread spectrum code is a key ...

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Application Information

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IPC IPC(8): H04B1/7075
Inventor 张波邓强方科
Owner 10TH RES INST OF CETC
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