Two-Dimensional Parallel Acquisition System in Spread Spectrum Communication
A technology of spread spectrum communication and frequency offset compensation, which is applied in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices, etc., and can solve problems such as low efficiency
Active Publication Date: 2016-05-04
北京星地恒通信息科技有限公司
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[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 acquisition of pseudo code phase and Doppler frequency deviation in satellite navigation system, thereby solving the low efficiency of traditional short pseudo code acquisition method question
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[0019] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.
[0020] The two-dimensional parallel capture system that the present invention realizes in FPGA is as figure 1 shown. It includes two parts: detection S1 and verification S2: the data preprocessing unit S11 of the detection part down-converts the input received signal and then down-samples it, and at the same time down-samples the local code, and the processed data is stored in the buffer IS12, and then sent to Part of the matched filter S13 performs parallel coherent calculations, and then stores the coherent results in the buffer IIS14, stores enough processed data once and sends them to FFTS15 to calculate the coherent spectrum, and then sends them to the non-coherent accumulation unit S16 to non-coherently accumulate the spectrum values, The non-coherent accumulation value is stored in the cache IIIS17 ...
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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 pseudocode phase and Doppler frequency deviation in a satellite navigation system. Background technique [0002] The current satellite navigation systems all 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 key performances such as receiver sensitivity and first positioning time, the problem of fast acquisition of spread spectrum signals has always been a hot topic of research at home and abroad. The capture method of the traditional short pseudocode is relatively mature, but the direct capture of the P code with a long period and high rate requires a lot of calculation. If the traditional short pseudocode capture method is still used, it will ta...
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IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 韩永占张克芳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