基于多相关器的GPS信号质量监测技术

Multi-correlators Techniques for GPS Signal Quality Monitoring

导航卫星的信号质量是影响系统定位性能的一个关键因素,当卫星自身硬件设备或空间传播信号受到干扰时,会导致卫星信号波形失真,用户接收机的伪码相关器产生的相关峰会产生偏差,造成定位精度下降;情况严重时,会使用户失去定位能力。因此,通过对空间信号的监测可以进一步保障系统的服务性能。文中借鉴现有的信号质量监测技术,对GPS信号失真的原因进行了总结,按照TMA、TMB和TMC完成失真信号的建模,并定性分析了对测距的影响。给出基于多相关器的导航信号质量监测方法,使用上述三种模型验证了该判定方法的有效性。

The signal quality of navigation satettttes 1s me essential ~actu~ tu t,,~ ~, performance. When the interferences occur on the satellite^s hardware or on the space propagation signals, the corresponding waveforms will be distorted, and the correlation peaks generated by the receivers become biased, hence degrade the positioning resolution, moreover, the positioning ability of users may also lost. Through monitoring the space signals, it may further assure the system＇s serviee performance. The causes of the distortion for GPS signals were concluded based on current signal quality monitoring techniques. The modeling of distorted signals was completed based on digital fault model, analog fault model, digital/analog fault model. The methods of muhi-correlators GPS signal monitoring were presented and verified by applying the above three models.