一种基于互差的卫星完好性检测新方法

A new detection method of satellite integrity based on the theory of mutual difference

针对卫星实际运行过程中可能出现异常的情况,提出了一种基于互差的卫星完好性检测新方法。首先验证卫星伪距偏差与卫星完好性的关系,并建立一个互差基准量;其次,同一历元,卫星伪距偏差对基准量作差,建立一个卫星完好性检测量;最后,根据检测量是否在其值域范围内判断对应卫星的完好性。经实验验证,该方法能够及时、准确检测出故障卫星,有效地保证了用户的定位精度。

In connection with the probable abnormal situation of satellites in the actual running , a satellite integrity algorithm based on the theory of mutual difference is proposed . First , in this algorithm , the relationship between the pseudo-range bias and satellite integrity is verified , and a reference quantity for mutual difference is established . Second , in the same epoch , the pseudo-range bias minus the reference quantity and a measurement is established for satellite integrity . Last , a judgment of satellite integrity is made according to whether the measurement is within the range of values or not . After the verification by experiment with the real da-ta , the failure satellite is detected timely and accurately and the user position accuracy is guaranteed effectively in this algorithm .