时钟偏差辅助的GPS完整性监测算法

General RAIM Algorithm Based on Aiding of Receiver Clock Bias

对伪距残差最小二乘的接收机自主完整性监测 (RAIM)算法进行了分析 .在此基础上 ,通过对接收机时钟偏差的建模 ,将模型预测的时钟偏差引入伪距残差最小二乘的RAIM算法中 ,保证了在可见星仅为 4颗的情况下 ,仍能利用 χ2检验法对全球定位系统 (GPS)进行完整性监测 ,从而达到提高完整性监测算法有效性的目的 .计算机仿真的结果显示 ,这种辅助方式不仅计算简单 ,而且有效可行 .

The characters of least-squares-residuals method belonging to receiver autonomous integrity monitoring (RAIM) were analyzed. After the receiver clock bias behavior was accurately modeled using global positioning system (GPS) measurements, a new algorithm for RAIM was developed based on the least-squares-residuals method with the aiding of receiver clock bias. It can be gained through the model. The novelty lies in that, on the condition of only four satellites in view, it can still use chi-square distribution to detect the failure satellite of GPS. So it can improve the availability of RAIM. The simulation results show that this algorithm is not only simple but also available and feasible.