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
- 김종원; 이택진; 소형민; 전상훈; 김강호; 기창돈; 고희동; 안상철
- 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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- KIST Publication > Conference Paper
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