| GAO Chang,CHEN Zewang,ZENG Qingxi,LYU Chade.Design and implementation of BeiDou signal fast acquisition algorithm based on FPGA+DSP[J].Journal of Hebei University of Science and Technology,2020,41(6):477-485 |
| 基于FPGA+DSP的北斗信號快速捕獲算法設計與實現 |
| Design and implementation of BeiDou signal fast acquisition algorithm based on FPGA+DSP |
| Received:September 03, 2020 Revised:October 10, 2020 |
| DOI：10.7535/hbkd.2020yx06001 |
| 中文關鍵詞: 測試計量儀器 北斗 快速捕獲 相干降采樣 現場可編程邏輯門陣列（FPGA） 數字信號處理器（DSP） |
| 英文關鍵詞:testing and measuring instruments BeiDou fast acquisition coherent down-sampling field-programmable gate arrays(FPGA) digital signal processor(DSP) |
| 基金項目:中央高�；究蒲袠I務費專項（NS2019022）; 南京航空航天大學研究生創新基地（實驗室）開放基金項目（kfjj20190312） |
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| 中文摘要: |
| 為了解決北斗衛星接收機中傳統并行頻率捕獲算法傅里葉變換需要處理的數據量大而影響衛星信號捕獲速度的問題，提出了一種基于相干降采樣的北斗信號快速捕獲算法。利用FPGA+DSP（高速數字信號處理器+現場可編程邏輯門陣列），在傳統的并行頻率捕獲算法中加入相干降采樣模塊，當信號進行載波剝離和偽碼剝離后，通過降低采樣頻率的方式減小傅里葉變換需要處理的數據量，再對衛星信號進行三維搜索。結果表明，理論上所提算法計算量減少了80%以上，對實際北斗信號進行捕獲時，平均每顆星的捕獲時間為9.95 ms，內存資源消耗相比于傳統并行頻率捕獲算法減少了42%。因此，新算法能在節約資源的同時有效提高捕獲速度，可為進一步提高軟件接收機的捕獲性能提供參考。 |
| 英文摘要: |
| In BeiDou satellite receiver, a fast BeiDou signal acquisition algorithm based on coherent down-sampling was proposed to solve the problem that the large amount of data to be processed by the Fourier transform affects the acquisition speed of satellite signals in the traditional parallel frequency acquisition algorithm. On the basis of FPGA+DSP (field-programmable gate arrays+digital signal processors), the coherent down-sampling module was added to the traditional parallel frequency acquisition algorithm, and after the carrier and pseudo random code were stripped, the sampling frequency was reduced to decrease the number of points to be processed in the Fourier transform, and then a three-dimensional search for the satellite signal was performed. Theoretical analysis shows that the algorithm can reduce the amount of calculation by more than 80%; the experiments on the actual BeiDou signal indicate that the average acquisition time of each star is 9.95 ms, and the memory resource consumption is reduced by 42% compared with the traditional parallel frequency acquisition algorithm. This algorithm can effectively improve the acquisition speed while saving resources, which can provide reference for further improving the acquistition performance of the software receiver. |
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