Multipath Suppression of Radio Navigation Transmitter Signal Based on Linear Sweep Carrier

Multipath interference is the main error source for radio navigation system high-precision positioning in complex environments. Multipath suppression and elimination are critical for radio navigation systems. A linear sweep carrier signal system is proposed to improve the multipath mitigation performance of radio navigation systems, and a TDMA+CDMA technique is adopted to avoid cross-correlation interference between transmitter signals and solve the near-far effect problem. Hardware simulation and actual environment experiment are carried out, and the results show that the proposed sweep carrier signal system can improve the ranging precision greatly compared with the traditional fixed frequency signal system.