导航发射信道对双频复用信号质量的影响

在新一代全球导航卫星系统建设中，双频联合恒包络复用技术得到了广泛的应用。由于信号在星上传输过程中会产生失真，所以需要分析不同双频复用信号通过发射信道后的信号质量。首先建立了一个基于实际发射信道的模型，然后主要分析了AltBOC(Alternate Binary Offset Carrier)、TD-AltBOC(Time Division Alternate Binary Offset Carrier)、ACE-BOC(Asymmetric Constant Envelope Binary Offset Carrier)等不同双频复用方案通过发射信道后的功率谱、星座图、鉴相曲线过零点偏差、相关损失。对三种调制方式进行对比，结果表明在考虑捕获灵敏度的情况下，应优先考虑ACE-BOC调制方式。

Effect of navigation transmission channel on dual-frequency multiplexing signal quality

In construction of the new generation global navigation satellite system(GNSS),dual-frequency constant envelope multiplexing technology has been widely used. The signal will be distorted during the transmission on the satellite,so it is necessary to analyze the signal quality of different dual-frequency multiplexed signals which have passed through the transmission channel. The actual transmission channel model is established firstly,then the power spectrum,the constellation,the zero-crossing deviation of the phase curve,and correlation loss of the AltBOC(Alternate Binary Offset Carrier),TD-AltBOC(Time Division Alternate Binary Offset Carrier) and ACE-BOC(Asymmetric Constant Envelope Binary Offset Carrier) are mainly analyzed. Comparison among the three modulations shows that ACE-BOC is preferred in considering the acquisition sensitivity.