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Analysis of the Effect of Phase Noise on Time Difference Estimation |
Zhong Sen Xia Wei He Zi-shu |
School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China |
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Abstract In the Time Difference Of Arrival (TDOA) measurement system, the performance of time difference estimation degrades due to the inevitable presence of phase noises of local oscillators at spatially separated receivers. The effect of the phase noise on the unbiasedness of classic cross-correlation time difference estimator is discussed herein, as well as the Cramér-Rao Lower Bound (CRLB) of estimation is derived in the phase noise environment. Furthermore, the CRLB of time difference estimation in additive noise environment with phase noise considered is derived. The CRLB degradation coefficient with respect to the CRLB in the additive noise environment is also given. The theoretical analysis is validated by the simulation results.
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Received: 06 December 2013
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Corresponding Authors:
Xia Wei
E-mail: wx@uestc.edu.cn
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