A Long Baseline Three Carrier Ambiguity Resolution with a New Ionospheric Constraint
AbstractGlobal navigation satellite sensors can transmit three frequency signals. When the classical three-carrier ambiguity resolution (TCAR) is applied to long baselines of hundreds of kilometres, the narrow-lane integer ambiguity resolution (IAR) is affected by the remaining double-differenced (DD) ionospheric delays. As such, large amounts of observational data are typically needed for successful recovery. To strengthen ionospheric delays, we analysed the combination of three frequency signals and a new ambiguity-free ionospheric combination where the least amount of noise is defined, which is enhanced with epoch-differenced ionospheric delays to provide better absolute ionospheric delay and temporal change. To optimize ionosphere estimations, we propose defining the optimal smoothing length, and also propose a strategy to diagnose wrongly determined ionospheric estimations. With such ionospheric information, we can obtain the ionosphere-weighted model by incorporating the ionospheric information to the geometry-based model and use the real triple-frequency observations to evaluate our method. Our results show that the precision of ionospheric estimations from our new ionospheric model is 25% higher than that from the current combination method and that it can provide real-time smoothed ionospheric delay with magnitudes defined to the nearest centimetre. Additionally, using ionospheric estimation as a constraint, the ionosphere-weighted model requires 20% less time to generate the first-fixed solution (TFFS) than the geometry-based model. View Full-Text
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Ning, Y.; Yuan, Y.; Huang, Z.; Chai, Y.; Tan, B. A Long Baseline Three Carrier Ambiguity Resolution with a New Ionospheric Constraint. ISPRS Int. J. Geo-Inf. 2016, 5, 198.
Ning Y, Yuan Y, Huang Z, Chai Y, Tan B. A Long Baseline Three Carrier Ambiguity Resolution with a New Ionospheric Constraint. ISPRS International Journal of Geo-Information. 2016; 5(11):198.Chicago/Turabian Style
Ning, Yafei; Yuan, Yunbin; Huang, Zhen; Chai, Yanju; Tan, Bingfeng. 2016. "A Long Baseline Three Carrier Ambiguity Resolution with a New Ionospheric Constraint." ISPRS Int. J. Geo-Inf. 5, no. 11: 198.
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