Two-dimensional parallel acquisition system in spread spectrum communication

A technology of spread spectrum communication and signal reception, applied in satellite radio beacon positioning systems, radio wave measurement systems, instruments, etc., can solve problems such as low efficiency

Active Publication Date: 2014-01-08
北京星地恒通信息科技有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to propose a two-dimensional parallel acquisition system in spread spectrum communication, realize the two-dimensional parallel acquisiti

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  • Two-dimensional parallel acquisition system in spread spectrum communication
  • Two-dimensional parallel acquisition system in spread spectrum communication
  • Two-dimensional parallel acquisition system in spread spectrum communication

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with examples, but the implementation of the present invention is not limited thereto.

[0020] The two-dimensional parallel capture system implemented in FPGA of the present invention is such as figure 1 Shown. It includes two parts: detection S1 and verification S2: the detection part data preprocessing unit S11 down-converts the input received signal and down-sampling, and at the same time the local code down-sampling, the processed data is stored in the buffer IS12, and the data is sent after it is stored for one time. Partially matched filter S13 performs parallel coherent calculation, and then stores the coherent result in the buffer IIS14. After storing enough data for one processing, it is sent to FFT S15 to calculate the coherent spectrum, and then sent to the non-coherent accumulation unit S16 to perform non-coherent accumulation of the spectrum value. , The incoherent accumulated valu...

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Abstract

The invention discloses a two-dimensional parallel acquisition system in spread spectrum communication, which comprises a detection part and a check part. A data preprocessing unit in the detection part performs down-conversion and down-sampling to signals and simultaneously performs down sampling to local codes, results are saved in a buffer memory I, then the results are transmitted to partial matching filters for computation, the results are saved in a buffer memory II, then the results are sequentially transmitted to an FFT (Fast Fourier Transform) and incoherent accumulation unit, the results are saved in a buffer memory III, finally the results are transmitted to peak searching unit for searching for a code phase a Doppler frequency offset corresponding to a maximum value, and the results are transmitted to the check part; a code time delay unit and a frequency offset compensation unit in the check part respectively perform code time delaying and signal frequency offset compensation to the detection results, the results are transmitted to an accumulation unit for coherent and incoherent accumulation, then the results are transmitted to a control unit for threshold judgment, the acquisition is successful if the results exceed a threshold, otherwise, the acquisition of a next section is performed and the acquisition is failed if all code phases are traversed. The two-dimensional parallel acquisition system in spread spectrum communication has the beneficial effects that the parallel acquisition of the code phase and the Doppler frequency offset is realized through a streamline method and the acquisition efficiency is greatly improved.

Description

Technical field [0001] The invention relates to a two-dimensional parallel acquisition system in spread spectrum communication, in particular to a two-dimensional parallel acquisition system of pseudo-code phase and Doppler frequency offset in a satellite navigation system. Background technique [0002] Current satellite navigation systems use spread spectrum technology, including my country's "Beidou-1" and "Beidou-2" satellite navigation systems. Since the acquisition performance of satellite signals directly determines the sensitivity of the receiver and the key performance of the first positioning time, the rapid acquisition of spread spectrum signals has been a hot topic in domestic and foreign research. The traditional short pseudo code acquisition method is relatively mature, and the direct acquisition calculation for the P code with long period and high rate is very large. If the traditional short pseudo code acquisition method is still used, it will take a long time to c...

Claims

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Application Information

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IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 韩永占吴建强朱刚王大全奚旻
Owner 北京星地恒通信息科技有限公司
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