Study On GNSS Integer Ambiguity Resolution Algorithm At Real-time

Integer ambiguity solution is to be regarded as the key to achieve precisepositioning, it has great significance to fast accurate Ambiguity degree of positioningaccuracy for GNSS positioning and shorten the positioning time.Double Difference Ambiguity Resolution principle, models and algorithms wereresearched systematacially in this paper. Double difference observation equation and itslinearization, and several fast ambiguity resolution methods were introduced in detail. Asingle calendar the element of the double difference ambiguity resolution method waspresent, which was validness finally through the experiment analysis and validation.This research work mainly with aspects:1. The GNSS positioning theoretical basis were introduced, including GNSS carrierphase and pseudorange observations and observation equation, and GNSS singledifference, and the combination of the double difference observation, and GNSSpositioning observation equation linearization, and GNSS observations between variouscommonly used combinations.2. The basic principles of OTF solution was detailed researched, with the IntegerAmbiguity model algorithm. Integer least squares ambiguity drop correlation adjustmentmethod， LAMBDA was in-depth studied.3. Two kinds of Ambiguity real-time fast/single epoch solver Studied, a newsingle epoch integer ambiguity solution method is proposed. First, wide lane ambiguityis resolved through the formation of a joint observation equation. Then, L1/L2ambiguity can be fixed. Two-step search method, combined with the wide laneambiguity can be accurately determined. And then using the combined observations ofthe ionosphere single epoch carrier phase ambiguity is calculated.4. The proposed algorithm is implemented with program, the feasibility of thealgorithm are verified by using the measured experimental data.