【摘要】 研究一种Galileo伪卫星信号格式.针对脉冲伪卫星信号的接收,提出两种脉冲同步方法,即分段FFT方法和脉冲图案匹配法.分段FFT方法利用伪卫星脉冲与接收机本地伪码间的分段相关特性,使用分段FFT相关算法获取脉冲时序信息;脉冲图案匹配法则利用伪卫星脉冲图案的伪随机特性,通过将接收脉冲图案与本地图案进行匹配操作实现脉冲同步.仿真分析显示,对于Galileo E1信号,脉冲图案匹配法的虚警特性最佳;而分段FFT方法平均捕获时间最短.两种方法都可极大地提高伪卫星接收机的同步性能.更多还原

【Abstract】 A kind of Galileo pseudolite signal format is described.For pulsed pseudolite signal receiving,we propose two pulse synchronization methods:the segmented FFT method and the pulse pattern matching method.By taking advantage of segmented correlation between receiving pulse and local pulse,the segmented FFT method obtains timing information of receiving pulsed signal through segmented FFT operation;and the pulse pattern matching method achieves synchronization by using the pseudo-random property of pulse pattern.For comparison,the simulation is conducted and the results indicate that the pulse pattern matching method has the best false alarm performance when receiving the Galileo E1signal and the segmented FFT method has the shortest average acquisition time.Both methods can effectively improve the performance of pseudolite receiver.更多还原