高动态GPS信号粗捕和精捕算法仿真实现
发布时间：2018-11-10 11:58
【摘要】：为了解决高动态下对GPS信号快速捕获的问题,提出了改进的部分匹配滤波(PMF)和快速傅里叶变换(FFT)相结合的粗捕方法,对其原理和结构进行了分析,并针对其引起的扇贝损失和捕获性能不高的问题,对传统PMF+FFT方法进行加窗处理;考虑到高动态下基于扩展卡尔曼跟踪的方法对捕获后参数的精度要求很高,因此在粗捕的基础上提出了基于线性调频Z变换(CZT)算法的精捕方法,并在GPS信号理论模型和模拟高动态轨迹的基础上,实现了高动态GPS数字中频信号的生成,为进一步加快捕获速度,对于冷启动时提出了一种组合码相关的卫星快速盲搜方法;最后通过MATLAB进行系统仿真实验,验证了所提出的高动态GPS信号粗捕和精捕算法能在加速度为100 g的高动态环境下有约10 Hz的捕获精度。
[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.
【作者单位】： 北京微电子技术研究所;
【基金】：核高基重大专项(2009ZX01031-001-014) 中国第二代卫星导航系统重大专项(GFZX03030204)~~
【分类号】：TN911.7;P228.4
本文编号：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.
【作者单位】： 北京微电子技术研究所;
【基金】：核高基重大专项(2009ZX01031-001-014) 中国第二代卫星导航系统重大专项(GFZX03030204)~~
【分类号】：TN911.7;P228.4
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