一种高精度空间多载波测距新算法

Abstract

Abstract:

According to the requirement of the precise space ranging, the Cramer-Rao Lower Bound (CRLB) is derived for the maximum-likelihood (ML) transmission delay estimation algorithm in multi-carrier systems from its expression. Based on the form of the likelihood function, a new iterative algorithm for delay estimation is proposed. Simulation results show that the proposed method leads to a high convergence rate. Compared with the exhaustive searching method, its complexity is low. The ranging accuracy of the proposed method is at least 3 times that of the phase measurement based multi-carrier method at the -10dB signal-to-noise ratio (SNR). With the increase of the SNR, the root-of-mean-square-errors (RMSEs) of the proposed method approach the Cramer-Rao lower bound.

Key words: multi-carrier, maximum likelihood, iterative, Cramer-Rao lower bound

CLC Number:

TN919

REN Guang-liang;BAI Yun;NI Hao;SUN Chui-qiang. New precise space ranging algorithm for multi-carrier systems[J].J4, 2009, 36(6): 957-961.

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New precise space ranging algorithm for multi-carrier systems

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