摘要
分析了基于分段匹配滤波器(PMF)-FFT实现高动态GPS信号捕获的子相关长度和FFT运算点数对捕获性能的影响,推导出多普勒频移捕获的范围和精度值,针对PMF-FFT捕获的多普勒频移分辨率低的缺点,提出了采用最小二乘法对幅频响应最大峰进行曲线拟合的方法来提高多普勒频率捕获精度的方案,最后对高动态GPS信号的捕获进行了仿真。结果表明:该方法可以很好地实现高动态GPS信号的快速精确捕获,并可以有效地缩短捕获时间和节省硬件资源。
Based on PMF（Partial Matched Filer）-FFT achieving high dynamic GPS signal acquisition of the sub-correlation length and the FFT operation points on the captured performance is analyzed.The range and the value of accuracy of Doppler frequency shift are deduced.For the shortcomings of low-resolution of Doppler frequency shift acquired by PMF-FFT,a program using leastsquares method for maximum peak amplitude-frequency response curve fitting method to improve the acquired accuracy of Doppler frequency is proposed.Finally,a simulation of acquired high dynamic GPS signal is carried out.The results show that：The method can achieve in acquiring the high dynamic GPS sigual quickly and accurately.In addition it can effectively reduce the acquisition time and save the hardware resources
出处
《计算机工程与应用》
CSCD
北大核心
2010年第7期142-144,147,共4页
Computer Engineering and Applications
关键词
全球定位系统信号
高动态
分段匹配滤波器
捕获
Global Positioning System（GPS） signal
high dynamic
partial matched filer
acquisition
