Blind Wideband Beamforming Algorithm Based on the Uncertainty Set

doi:10.11947/j.JGGS.2021.0207

Abstract

Abstract:

Without prior knowledge, the steering vector estimation error of the desired signal will deteriorate the beamforming performance to some extent.To solve this problem, a space-time blind wideband beamforming algorithm based on the uncertainty set is proposed.First of all, based on the space-time filtering model, the spherical constraint set is designed according to the uncertainty of the estimation error of the space-time steering vector. Then, the method of wideband beamforming under multi-constraints in the frequency domain is derived, and the calculation of parameters of steering vector estimation error and loading factor are given in detail. Finally,a blind broadband beamforming algorithm combined with the CAB algorithm is proposed. The improvement of the output signal-to-noise ratio is quantitatively analyzed by computer simulation to verify the correctness and robustness of the algorithm.

Key words: Space-time Adaptive Filtering (STAP); CAB; blind wideband beamforming; uncertainty set constraints

Chao REN,Zhengxuan ZHANG,Enyuan TU. Blind Wideband Beamforming Algorithm Based on the Uncertainty Set[J]. Journal of Geodesy and Geoinformation Science, 2021, 4(2): 72-78.

Figures/Tables 6

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Estimation error of angle/(°)	ε₁	ε₂	ε₃	ε₄	ε₅	ε₆	ε₇	ε₈
1	1.315	1.321	1.326	1.332	1.337	1.343	1.348	1.354
2	5.164	5.185	5.206	5.227	5.249	5.270	5.291	5.313
3	11.265	11.310	11.355	11.400	11.445	11.490	11.535	11.580
4	19.181	19.253	19.327	19.399	19.473	19.546	19.619	19.692
5	28.351	28.452	28.553	28.654	28.755	28.856	28.958	29.059
6	38.143	38.268	38.393	38.518	38.643	38.769	38.894	39.019
7	47.910	48.051	48.192	48.333	48.473	48.614	48.754	48.894
8	57.039	57.184	57.330	57.475	57.620	57.764	57.908	58.052