Burst direct sequence spread spectrum system and pseudo code synchronization method of burst direct sequence spread spectrum waveform thereof

A direct spread, waveform technology, applied in the field of high dynamic weak target capture and tracking, can solve the problems of carrier estimation accuracy and range, high frequency offset estimation accuracy, and shorten convergence time, etc., to achieve fast capture and accurate tracking, and improve the system capacity and the effect of shortening the convergence time

Inactive Publication Date: 2017-08-08
10TH RES INST OF CETC
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Problems solved by technology

[0007] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, especially the problem that the burst direct spread system cannot balance the accuracy and range of download wave estimation at extremely low signal-to-noise ratios, and to provide a method with less res

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  • Burst direct sequence spread spectrum system and pseudo code synchronization method of burst direct sequence spread spectrum waveform thereof
  • Burst direct sequence spread spectrum system and pseudo code synchronization method of burst direct sequence spread spectrum waveform thereof
  • Burst direct sequence spread spectrum system and pseudo code synchronization method of burst direct sequence spread spectrum waveform thereof

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Embodiment Construction

[0024] refer to figure 1 . In the embodiment described below, the direct sequence spread spectrum communication system includes a signal modulation system and a signal demodulation system, wherein the signal modulation system includes a scrambler 101, a channel encoder 102, a symbol mapper 103, The signal modulation circuit that spreader 104, framer 105, shaping filter 106 and I / Q quadrature modulator 107 constitute, and signal demodulation system comprises I / Q quadrature demodulator 108, low-pass Filter 109, A / D sampler 110, matched filter 111, pseudocode phase, carrier frequency offset capture and coarse synchronizer 112, pseudocode phase fine synchronizer 113, carrier phase fine synchronizer 114, frame synchronizer 115, A signal demodulation circuit composed of channel decoder 116 and descrambler 117. In the signal modulation system, the user data passes through the scrambler 101 and the channel encoder 102, together with the preamble data which respectively pass through ...

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Abstract

The invention discloses a burst direct sequence spread spectrum system and a pseudo code synchronization method of a burst direct sequence spread spectrum waveform thereof. By adoption of the burst direct sequence spread spectrum system disclosed by the invention, the capturing, tracking and convergence times of a burst direct sequence spread spectrum signal can be greatly shortened, and the frequency offset estimation precision is relatively high. The burst direct sequence spread spectrum system disclosed by the invention is realized by the following technical scheme: in a signal modulation system, a specific segment of lead data is added in front of user data after scrambling and channel encoding are carried out on the user data for accomplishing signal capture and synchronization; and in a signal demodulation system, pseudo code phase capture and carrier frequency offset capture are carried out on a digital baseband signal to accomplish signal capture, coarse pseudo code phase synchronization and coarse frequency offset compensation with a coarse synchronizer, precise signal synchronization of a coarse synchronization signal is separately accomplished by pseudo code phase and carrier phase synchronization loops, identification information and a starting position of a user data segment are determined from a precise synchronization signal by a frame synchronizer, and the user data are restored by channel decoding and descrambling.

Description

technical field [0001] The invention relates to a high dynamic weak target acquisition and tracking method based on a direct spread signal waveform in a burst mode, especially in a high dynamic scene where a transceiver moves relative to each other at a high speed, aiming at aligning the Doppler frequency deviation with the clock deviation The influence of the spread signal, the method of quickly capturing the pseudocode phase and carrier phase and synchronously tracking the signal is completed. Background technique [0002] Spread spectrum technology is a technology widely used in the field of communication. Due to the characteristics of strong anti-interference ability, low intercept probability, anti-multipath and good confidentiality, spread spectrum communication has been widely used in satellite communication and mobile communication systems, among which the direct sequence spread spectrum system is the most widely used. During the use of spread spectrum equipment, wh...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/00H04B1/7077H04B1/7087
Inventor 张海涛卢建川吴世奇
Owner 10TH RES INST OF CETC
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