卫星广播信号上重叠发射导航增强信号的方法

提出了一种在卫星广播信号上重叠发射卫星导航增强信号的方法，将差分校正数据经过扩频后发射出去，与卫星广播信号进行频谱重叠，一起经卫星转发。通过参数设计和性能仿真可知，差分增强信号对广播信号的接收解调影响很小，差分接收机可以通过串行干扰抵消的方法从混合信号中提取出差分增强信号，实现解扩与辅助测距，解扩得到的差分校正数据可直接用于差分定位。当混合功率比为26 dB时，捕获概率达99.99%，测距精度为10.67 m，表明了此方法的可行性。

A method of launching navigation enhanced signal overlapped satellite broadcast signal

This paper presents a method of launching the satellite navigation enhanced signal overlapped satellite broadcast signal. The differential correction data is transmitted after spectrum spreading.The signal spectrum and the satellite broadcast signal spectrum are overlapped, and retransmitted by the satellite. By the parameter design and the performance simulation, the differential enhanced signal has little effect on the reception and the demodulation of the broadcast signal. The differential receiver can get the differential enhanced signal from the mixed signal by the successive interference cancellation, and despread and secondarily measure distance. When the mixed power ratio is 26 dB, the acquisition probability is 99.99%, and the ranging accuracy is 10.67 m, which proves the feasibility of the method.