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GNSS is capable of providing high-precision and drift-free attitude information. The traditional attitude determination methods based on the baseline vector and carrier phase measurement process attitude determination estimation and ambiguity resolution sequentially. And the redundant measurements from multi-baselines have not been fully utilized. A GNSS measurements based attitude determination method...
This work presents a coherent vector tracking loop (CVT) for BDS signals based on cascaded filters. The structure of CVT is based on extended Kalman filters (EKF), including several local filters and a common navigation filter. A fault detection and exclusion algorithm (FDE) integrated to the tracking loop is introduced. This FDE method is used to detect and exclude the failed channel from the navigation...
The loop gain could affect the performance of a GNSS carrier tracking loop in different conditions. A factor is inserted to carrier tracking loop to adjust loop gain conveniently. The mathematical relationship between the performance of a universal second order carrier tracking loop and its loop gain was derived and analyzed in detail. The maximum, minimum, and optimal loop gain was given in different...
Applying the methods of on-site observation and dynamic model, the research on the fronts at Jiulongjiang estuary has been carried out, during which spatial and temporal distribution, dynamic characteristics and formation mechanism of salinity fronts is analyzed and discussed. The research shows that the estuarine fronts mainly lie in the area from Jiyu Islet to Haimen Island, outside of Yuweizai...
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