高動(dòng)態(tài)GPS信號(hào)粗捕和精捕算法仿真實(shí)現(xiàn)
發(fā)布時(shí)間：2018-11-10 11:58
【摘要】：為了解決高動(dòng)態(tài)下對(duì)GPS信號(hào)快速捕獲的問(wèn)題,提出了改進(jìn)的部分匹配濾波(PMF)和快速傅里葉變換(FFT)相結(jié)合的粗捕方法,對(duì)其原理和結(jié)構(gòu)進(jìn)行了分析,并針對(duì)其引起的扇貝損失和捕獲性能不高的問(wèn)題,對(duì)傳統(tǒng)PMF+FFT方法進(jìn)行加窗處理;考慮到高動(dòng)態(tài)下基于擴(kuò)展卡爾曼跟蹤的方法對(duì)捕獲后參數(shù)的精度要求很高,因此在粗捕的基礎(chǔ)上提出了基于線性調(diào)頻Z變換(CZT)算法的精捕方法,并在GPS信號(hào)理論模型和模擬高動(dòng)態(tài)軌跡的基礎(chǔ)上,實(shí)現(xiàn)了高動(dòng)態(tài)GPS數(shù)字中頻信號(hào)的生成,為進(jìn)一步加快捕獲速度,對(duì)于冷啟動(dòng)時(shí)提出了一種組合碼相關(guān)的衛(wèi)星快速盲搜方法;最后通過(guò)MATLAB進(jìn)行系統(tǒng)仿真實(shí)驗(yàn),驗(yàn)證了所提出的高動(dòng)態(tài)GPS信號(hào)粗捕和精捕算法能在加速度為100 g的高動(dòng)態(tài)環(huán)境下有約10 Hz的捕獲精度。
[Abstract]:In order to solve the problem of fast acquisition of GPS signal in high dynamic condition, an improved coarse capture method combining partial matched filter (PMF) and Fast Fourier transform (FFT) is proposed, and its principle and structure are analyzed. Aiming at the problem of scallop loss and poor capture performance caused by scallop, the traditional PMF FFT method is windowed. Considering that the precision of parameters after acquisition is very high based on extended Kalman tracking under high dynamic conditions, a precision capture method based on linear frequency modulation Z transform (CZT) algorithm is proposed on the basis of coarse trapping. Based on the theoretical model of GPS signal and the simulation of high dynamic trajectory, the generation of high dynamic GPS digital intermediate frequency signal is realized. In order to further accelerate the acquisition speed, a fast blind search method based on combination code correlation is proposed for cold start. Finally, the system simulation experiments with MATLAB show that the proposed coarse and fine capture algorithm of high dynamic GPS signal can capture the accuracy of about 10 Hz in the high dynamic environment with acceleration of 100g.
【作者單位】： 北京微電子技術(shù)研究所;
【基金】：核高基重大專項(xiàng)(2009ZX01031-001-014) 中國(guó)第二代衛(wèi)星導(dǎo)航系統(tǒng)重大專項(xiàng)(GFZX03030204)~~
【分類號(hào)】：TN911.7;P228.4
本文編號(hào)：2322413
[Abstract]:In order to solve the problem of fast acquisition of GPS signal in high dynamic condition, an improved coarse capture method combining partial matched filter (PMF) and Fast Fourier transform (FFT) is proposed, and its principle and structure are analyzed. Aiming at the problem of scallop loss and poor capture performance caused by scallop, the traditional PMF FFT method is windowed. Considering that the precision of parameters after acquisition is very high based on extended Kalman tracking under high dynamic conditions, a precision capture method based on linear frequency modulation Z transform (CZT) algorithm is proposed on the basis of coarse trapping. Based on the theoretical model of GPS signal and the simulation of high dynamic trajectory, the generation of high dynamic GPS digital intermediate frequency signal is realized. In order to further accelerate the acquisition speed, a fast blind search method based on combination code correlation is proposed for cold start. Finally, the system simulation experiments with MATLAB show that the proposed coarse and fine capture algorithm of high dynamic GPS signal can capture the accuracy of about 10 Hz in the high dynamic environment with acceleration of 100g.
【作者單位】： 北京微電子技術(shù)研究所;
【基金】：核高基重大專項(xiàng)(2009ZX01031-001-014) 中國(guó)第二代衛(wèi)星導(dǎo)航系統(tǒng)重大專項(xiàng)(GFZX03030204)~~
【分類號(hào)】：TN911.7;P228.4
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