新型GNSS信号波形设计

在发射带宽严格受限的约束下连续函数波形信号较传统矩形波形表现出了较高的频谱利用率优势和优良性能,很有可能应用到未来的全球卫星导航系统(GNSS,Global Navigation Satellite System)信号体制中.在建立导航信号波形设计准则的理论模型基础上,研究了7种可能适用于未来GNSS系统的新型信号波形,在典型的宽/窄发射带宽条件下,通过仿真评估了传统GNSS信号和新型GNSS信号的精度、抗多径、抗干扰等性能,优选出BOCc和MSK两种适用于不同环境的信号波形: 在频谱资源充足的情况下,BOCc信号具有最优的导航性能;在频率资源受限的情况下,MSK信号兼容性好,抗干扰能力强,拥有较好的导航性能.最后,结合两类信号波形的优缺点提出了我国新一代卫星导航系统信号波形设计的建议.

New signal waveforms design for GNSS

Continuous function waveforms will probably be adopted by future global navigation satellite system(GNSS) signals in bandwidth limitation situation due to their higher spectrum efficiency and better performance. In order to find new signal waveform solution for future GNSS, design criteria of navigation signal waveforms were established, and several waveforms appropriate for future GNSS were explored. The characteristics of traditional and new signals were simulated and compared, code tracking noise, anti-multipath and anti-interference performances were evaluated. It was find that BOCc and MSK applicable to different bandwidths outperform other signal waveforms: BOCc has better performance in wide-band situation, and MSK has better performance in band limit situation; thus the two waveforms were proposed for new generation GNSS signal design.