空频抗干扰对GNSS载波相位测量的影响

Effect of space-frequency adaptive processing on carrier phase measurements of Global Navigation Satellite Systems

摘要:

对于全球导航卫星系统(GNSS)的抗干扰，最有效的是采用自适应天线阵技术，但这种抗干扰处理会引入与信号入射方向相关的载波相位测量偏差，限制了其在高精确度测量领域的应用。为减小抗干扰处理的偏差，引入测量偏差及其分析方法，建立仿真模型，并搭建软件接收机进行实验。结果表明，在不增加额外约束的条件下，采用空频最小方差无畸变响应算法实现空频抗干扰处理器，不会引入载波相位测量偏差，非常适用于对抗干扰性能和测量精确度均有苛刻要求的场合。

Abstract:

Adaptive antenna array technology is the most effective method for anti-interference of Global Navigation Satellite Systems(GNSS). However, this anti-interference processing generates carrier phase measurement bias related to the direction of signal incidence, which limits the effective application in high-precision measurement. In order to reduce the bias of anti-interference processing, an analysis method of introducing measurement bias is proposed, a corresponding model is established, and a software receiver is built for simulation experiments. The results show that without adding additional constraints, adopting the space frequency minimum variance distortionless response algorithm to achieve a space frequency anti-interference processor would not introduce carrier phase measurement bias, making it very suitable for applications in fields with strict requirements on anti-interference performance and measurement accuracy.