一种基于FFT的Galileo搜救信号频域检测方法

Galileo搜救系统是全球卫星搜救组织(COSPAS-SARSAT)的一部分,搭载于Galileo导航星座,能对遇险用户发出的求救信号进行定位并实施救援。经卫星转发的搜救信号信噪比很低,能否在低信噪比条件下完成卫星信号的检测对搜救系统的正常工作至关重要。为了解决这一问题,文章提出了一种基于快速傅里叶变换(FFT)运算的频域检测方法,通过理论分析和仿真验证可以看出,这种方法能有效地实现低信噪比条件下的卫星下行信号检测。

Frequency Domain Detection Method for Galileo Search and Rescue Beacon Signal

The Galileo Search and Rescue system is a part of the Global Satellite Search and Rescue System(COSPAS-SARSAT),which is carried on the Galileo navigation constellation.Using the Galileo Search and Rescue system,the distress signal can be localized and then rescue activity can be executed.The signal to noise ratio of satellite transmitted signal by is very low,so it is extremely important for the operation of search and rescue system that whether it is able to detect signal under the condition of low signal to noise ratio.In order to solve this problem,a frequency domain detection method based on FFT operation was presented.The theoretical analysis and simulation verification show that the satellite signal can be effectively detected under low signal to noise ratio using this method.