摘要:
随着我国北斗导航系统“全球组网”序幕的拉开,设计实现接收机的兼容互操作功能已变成接收机设计领域的一个研究热点。文中针对GNSS双频兼容互操作接收机信号捕获环节设计中遇到的处理时间长、捕获精度低、硬件资源消耗大、兼容性差等问题,设计一种基于频域处理的信号捕获算法。该算法在传统频域捕获的基础上,优化频域转换资源利用与遍历方式,在能量累加方面加入相干与非相干累加方式,达到微弱信号捕获。借助Xilinx软件Vivado及其仿真工具,对整个捕获系统进行了仿真实现,验证了算法设计的准确性,本算法可以捕获信号功率-135 dB以上的信号,可捕获的载波多普勒频率范围满足实际工程需求。在实际工程验证中,本算法能较好地满足工程应用性能要求。
关键词:
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GNSS
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兼容互操作
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捕获
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FFT
Abstract:
With the opening of the "global network" of the Beidou navigation and positioning system, the design and implementation of the compatible interoperability of the receiver has become a hot spot in the field of the receiver design. In this paper, aiming at the problems of long processing time, low acquisition precision, large hardware resource consumption and poor compatibility in the design of signal acquisition link of GNSS dual frequency compatible interoperable receiver, a signal capture that can capture GPS, Galileo, GLONASS, BDS signals at the same time, and can capture Doppler frequency offset and code offset quickly, is designed. With the help of Xilinx simulation tool Vivado and its simulation software, the whole capture system is simulated, and the accuracy of the algorithm is verified. In actual engineering verification, this algorithm can better meet the engineering application requirements.
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