Acquisition system and method for high data rate direct sequence spread spectrum signals under large Doppler dynamic condition

A high-data-rate, direct-spread signal technology, applied in the field of measurement and control, can solve the problems of high algorithm complexity, lack of public information, and unfavorable implementation, achieving low signal-to-noise ratio and reducing pressure.

Active Publication Date: 2015-08-12
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

This method can complete the unassisted fast acquisition of high data rate direct spread signals and long code direct spread signals under low signal-to-noise ratio, but it is not suitable for Doppler dynamics, and the algorithm compl

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  • Acquisition system and method for high data rate direct sequence spread spectrum signals under large Doppler dynamic condition
  • Acquisition system and method for high data rate direct sequence spread spectrum signals under large Doppler dynamic condition
  • Acquisition system and method for high data rate direct sequence spread spectrum signals under large Doppler dynamic condition

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Embodiment Construction

[0041] like figure 1 As shown, the present invention provides a high data rate direct spread signal acquisition system under Doppler dynamics, including: down-conversion module, local clock management unit, data buffer module, symbol edge detection and rough capture module, read-write control module, NCO module, acquisition control module, spectrum analysis module, pseudo code tracking loop and carrier tracking loop;

[0042] The external input DS signal is down-converted and down-sampled by the down-conversion module and then sent to the data buffer module. The data buffer module shifts and buffers the data and sends it to the symbol edge detection and coarse capture module; The clock management unit makes the local clock management unit generate the pseudo-code clock, pseudo-code periodic pulse and data clock pulse; the pseudo-code clock is sent to the NCO module, which drives the NCO module to generate a local pseudo-code signal and sends it to the symbol edge detection and...

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Abstract

The invention discloses an acquisition system and method for high data rate direct sequence spread spectrum signals under a large Doppler dynamic condition. A coarse acquisition based on symbol jump edge detection, and a precision controllable Doppler spectrum analysis are employed in the method. The coarse acquisition based on symbol jump edge detection can acquire data symbol jump edge positions, pseudo code phases and primary Doppler frequency offset estimates of the direct sequence spread spectrum signals. Coarse acquisition results are verified through the spectrum analysis, and a final Doppler frequency offset estimation whose accuracy is lower than dozens of Hertz is obtained, so that requirements on tracking loops are significantly reduced. By employing the method, the high data rate direct sequence spread spectrum signals with low signal-to-noise ratios under the large Doppler dynamic condition can be rapidly acquired.

Description

technical field [0001] The invention relates to a fast acquisition system and method for high data rate direct spread signals under Doppler dynamics, and belongs to the technical field of measurement and control. Background technique [0002] At present, the field of satellite measurement and control mainly adopts the direct sequence spread spectrum measurement and control system, and the satellite terminal receives the spread spectrum uplink remote control signal sent by the ground control center to complete the remote control instruction reception. The remote control signal (direct spread signal) adopts the PCM-CDMA-BPSK direct sequence spread spectrum system. Due to the motion characteristics of high, medium and low orbit satellites, the remote control signal received by the terminal on the star has the characteristics of low signal-to-noise ratio and Doppler dynamic (above ±50KHz), which directly leads to the loss of processing gain. signal capture. In order to ensure ...

Claims

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Application Information

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IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 杨瑜波吉欣雷静孙重磊聂少军
Owner XIAN INSTITUE OF SPACE RADIO TECH
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