分布式全相参雷达相干参数估计及相参性能分析

doi:10.11959/j.issn.1000-436x.2015067

Abstract

Abstract:

The closed-form CRB (cramer-rao bounds) of the coherent parameters estimation, which include time delay differences and total phase differences, are derived for the distributed aperture coherent radar with general architecture firstly. Then under the assumption that time delay and phase synchronization errors are all existing, the performance bound of oSNRg (output signal-to-noise ratio gain) is developed based on the aforementioned CRB (Cramer-rao bounds). It is concluded that: the CRB of total phase differences is independent on the carrier frequency and effective bandwidth. More transmitters give higher oSNRg. However, as the number of receivers increase, the oSNRg gradually improve with the input SNR being high sufficiently, and worsen with the input SNR being low. Finally, the numerical examples dem-onstrate the validity of the theoretical results.

Key words: fully coherent, Cramer-rao bound, parameters estimation, Fisher information matrix

Jing SONG,Jian-yun ZHANG,Wen-gang ZHANG. Coherent parameters estimation and coherent performance analysis for distributed aperture coherent radar[J]. Journal on Communications, 2015, 36(3): 130-138.

Figures/Tables 8

时延差和相位差	TO模型	T/R模型
发射时延差	$\frac{1}{S N R_{in} 4 π^{2} β^{2}} \frac{1}{L}$	$\frac{1}{S N R_{in} 4 π^{2} β^{2}} \frac{1}{L}$
接收时延差	$\frac{1}{S N R_{in} 4 π^{2} β^{2}} \frac{1}{K}$	$\frac{1}{S N R_{in} 4 π^{2} β^{2}} \frac{1}{K}$
发射相位差	$\frac{1}{S N R_{in}} \frac{1}{L}$	$\frac{1}{S N R_{in}} \frac{1}{L} \frac{f_{c}^{2} + β^{2}}{β^{2}}$
接收相位差	$\frac{1}{S N R_{in}} \frac{1}{K}$	$\frac{1}{S N R_{in}} \frac{1}{K} \frac{f_{c}^{2} + β^{2}}{β^{2}}$

References 18

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