Method for determining carrier phase integer ambiguity in satellite navigation

Abstract

The invention discloses a method for determining carrier phase integer ambiguity in satellite navigation. The method for determining the carrier phase integer ambiguity comprises the steps that firstly, the F value checked through F-Ratio and the W value checked through W-Ratio are calculated, the F value checked through F-Ratio is calculated according to the formula shown in the specification, and the W value checked through W-Ratio is calculated according to the formula shown in the specification, wherein according to the relational expressions shown in the specification, is the floating point solution of ambiguity, is the variance-covariance matrix of the ambiguity, is the searched integer ambiguity value with the minimum mean square residual error, is the second integer ambiguity value, L is the double-difference observation quantity, P is the weight matrix, A is the direction matrix, is the pseudorange difference solution, and m is the dimensionality of the double-difference observation quantity; secondly, the worked out F value and the worked out W value are compared with the corresponding threshold values respectively, and therefore the effectiveness of the ambiguity is judged. The ambiguity misjudgment and judgment omission caused by the inner and outer error of a model can be effectively restrained, the ambiguity resolving success rate can be effectively improved, the ambiguity fixing time can be shortened, and the system can obtain a high-precision positioning and orienting result easily.

Description

technical field [0001] The invention relates to a method for determining a carrier phase integer ambiguity in satellite navigation. Background technique [0002] With the development of science and technology, the application of satellite navigation is becoming more and more extensive. In satellite navigation systems, we can usually obtain two basic observations from satellite signals, which are pseudorange and carrier phase. Carrier phase observations are much more accurate than pseudoranges, so they are high-precision positioning and orientation. basic method. However, there is an ambiguity in the carrier phase measurement, which is an unknown fixed a priori value. Once the ambiguity of the whole cycle is fixed, the carrier phase can be used as an accurate pseudo-range measurement without ambiguity. Therefore, the solution and determination of ambiguity becomes a crucial aspect in high-precision positioning and orientation. [0003] The ambiguity solution is usually div...

AI Technical Summary

Problems solved by technology

In the prior art, the widely used F-Ratio test mainly depends on the accuracy of the initial ambiguity, which can only detect the error inside the observation equation, but cannot detect the model error outside the observation equation, and is not sensitive to the model error; when the measurement In the presence of unmodeled systematic errors, the accuracy of the estimated parameters does not always reflect their accuracy, so it is very likely that the best ambiguity obtained will be wrong, which is intolerable in high-precision positioning and orientation

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