Low-orbit satellite ambiguity fixing is the import factor affecting GPS network difference reliability. In this paper, the
satellite will be selected as reference satellite by elevation angle of satellite and barycenter of triangle to construct weight
matrix. Quickly resolving double difference wide ambiguity based on wide-lane combination, fixing ambiguity of L1/L2
by LAMBDA algorithm, estimating troposphere error in non-ionosphere combination by HOPFIELD model, improving
0.3cycle float ambiguity accuracy of low elevation angle satellite, applying this method to develop network differential
systems by our own intellectual property rights. The actual tests show that: accessing to the system the actual mobile
station position plane accuracy is better than 5cm.
A conventional method to mitigate multipath errors in GNSS receivers is the strobe correlator, which achieves
discriminator function shaping by combining two different narrow-correlator discriminators [1] [2]. The method
performs a good performance when the difference in delays of direct and reflected signal is biggish in GPS scenario.
Nevertheless, the performance of the method is not so good for Galileo scenario. The advent of the European navigation
system Galileo has made it an exigent requirement to develop the receiver that can track Galileo signals as well as GPS
signals. So, a better way should be groped for to mitigate both GPS and Galileo multipath errors. In the paper, a novel
multipath mitigation scheme, named Early-Late Strobe Correlator (ELSC), was presented for both GPS and Galileo
signals. By the Matlab simulation to the method, multipath errors could be mitigated effectively by using ELSC,
especially to Galileo signals. The experiment results show that more excellent performances can be obtained by adopting
ELSC presented in the paper with respected to the strobe correlator, although this will result in a more complex structure
of discriminators.
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