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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.
Under the constraint that the transmission bandwidth is strictly limited, the continuous function waveform signal shows a higher spectrum utilization advantage and superior performance than the conventional rectangular waveform and is likely to be applied to the future Global Navigation Satellite System (GNSS) Signal system.On the basis of establishing the theoretical model of navigational signal waveform design criteria, seven new signal waveforms that may be suitable for future GNSS systems are studied. Under the typical wide / narrow transmission bandwidth, traditional GNSS signals And new GNSS signals such as accuracy, anti-multipath and anti-jamming, BOCc and MSK are selected as signal waveforms for different environments. The BOCc signal has the best navigation performance under the condition of sufficient spectrum resources; MSK signal has good compatibility, strong anti-jamming capability and good navigation performance under limited resources.Finally, combining with the advantages and disadvantages of the two types of signal waveforms, we propose the signal waveform design of a new generation of satellite navigation system in our country.