A New Approach to Calibrate Pseudolite Position using Multi-Antenna and Carrier Phase Measurement Without Cycle Ambiguity

A New Approach to Calibrate Pseudolite Position using Multi-Antenna and Carrier Phase Measurement Without Cycle Ambiguity
Pseudolite; calibration
Issue Date
, 250-257
To use pseudolite systems, the pseudolites’ own positions must be calibrated in advance. There was a study which used carrier phase based Inverted-GPS positioning algorithm. But this method cannot be applied to the measurements including any cycle slips or losses of lock. By this reason, the previous method was considered to be inefficient, spend so much time, and cannot be applied to the ill-conditioned or wide area. In this context, this paper proposed multi-antenna based pseudolite calibration algorithm. By using this method, the ambiguity can be eliminated epoch by epoch in a simple way, hence the cycle slip-free carrier phase collection is possible. Moreover, an enhanced calibration algorithm is also proposed. This algorithm utilizes measurements collected at the unknown positions to replace calibration points and minimize the number of calibration points down to three. The measurement can easily collected by the on-the-floor assumption. Simulation results are given to show feasibility of proposed algorithm. According to the simulation result for algorithm 1, the calibration accuracy of proposed method was calculated as for the case of 5 antennas. However the actual navigation user error was almost the same as that of previous method. The calibration process became remarkably easy and comfort by algorithm 1. The simulation results for algorithm 2 showed that it is possible to replace the calibration points by use of measurements from unknown positions. The precision of algorithm 2 is similar with that of algorithm 1. Using algorithm 2, the calibration process became even much easier than algorithm 1. In the case of actual calibration, the algorithm 2 can be easily used if the navigation area has flat floors. On the other general cases, the algorithm 1 can be used to make the calibration process easy and comfort.
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