基于自适应MEDLL的伪卫星室内多径估计算法

doi:10.12305/j.issn.1001-506X.2023.08.25

Abstract

Abstract:

In the indoor environment, the indoor pseudolite positioning system is seriously affected by multipath effect. To solve this problem, an indoor pseudolite multipath estimation algorithm based on adaptive multipath estimating delay lock loop (MEDLL) is proposed. In this algorithm, a reference correlator is added based on the MEDLL, whose output is used as a benchmark, and the noise correlation values of other correlators are compared with the output values of the reference correlator after all signal influence is eliminated by MEDLL, so as to obtain the accurate estimation of the number of multipath signals. Experiments'result show that the proposed algorithm has good adaptability to multipath with different delay and amplitude, and can still estimate the number of multipath correctly under low signal to noise ratio. The root mean square of direct signal amplitude estimation error can be reduced by 59% compared with the grid MEDLL algorithm and 43% compared with Teager-Kaiser(TK)-MEDLL algorithm, proving that it is more suitable for indoor pseudolite positioning system to anti-multipath.

Key words: pseudolite, indoor positioning, multipath estimation, multipath estimating delay lock loop (MEDLL)

CLC Number:

TN967.1

Wenqing XIA, Qing WANG, Bo ZHANG, Yuan YANG. Indoor pseudolite multipath estimation algorithm based on adaptive MEDLL[J]. Systems Engineering and Electronics, 2023, 45(8): 2506-2513.

Figures/Tables 12

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Indoor pseudolite multipath estimation algorithm based on adaptive MEDLL

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