基于批处理的微弱GPS信号捕获

Batch Processing-Based Acquisition of Weak GPS Signals

针对传统方法难以实现微弱GPS信号的精确捕获,继而影响后续的信号跟踪及导航电文解码,提出了一种新的捕获方法解决这一基础性问题,采用基于批处理的手段来捕获低信噪比的GPS信号并提高运算速度,为高灵敏度GPS接收机的实现提供保证.仿真结果表明,在捕获过程处理的数据长度不超过4个导航电文数据位(80 ms)的情况下,此方法能够较好地捕获到载噪比低至21 dB的GPS信号,同时确保较短的捕获时间和较高的灵敏度.

It is difficult to get the accuracy acquisition of GPS signal by traditional methods and eventually disable the tracking and decoding of navigation data when the signal is very weak. This paper presented a new acquisition method to solve this foundational problem, using the batch processing based method to enhance the ability of receiving weak signal and improve the speed of computation. This new method can provide a basis for GPS receiving technology with high sensitivity. The experimental results show that, with the data to be processed not more than four navigation data bits （80 ms）, signal with carrier noise ratio down to 21 dB can be well acquired by the new method, while ensuring short acquisition time and high sensitivity.