Robust Broadband Array Beamforming with Multiple-Beam Constraints
碩士 === 國立臺灣大學 === 電信工程學研究所 === 93 === The theory about narrowband array signal processing is almost complete and saturated. There exist lots of robust algorithms for each non-ideal condition to improve the array performance. In my thesis I try to extend the robust algorithm used in narrowband signal...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2005
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| Online Access: | http://ndltd.ncl.edu.tw/handle/05956276204490360992 |
| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 93 === The theory about narrowband array signal processing is almost complete and saturated. There exist lots of robust algorithms for each non-ideal condition to improve the array performance. In my thesis I try to extend the robust algorithm used in narrowband signal and narrowband beamformer to broadband beamformer dealing with broadband signals. And in the broadband beamformer structure I use the tap-delay-line after each array element to yield desired frequency response. I discuss two non-ideal situations: angle mismatch and coherent interference. Then under the criterions used in narrowband case before, I extend the robust algorithm to broadband case and simulate their performance.
For angle mismatch, I extend the Cheng’s method to broadband case. However finding the signal subspace is not easy like narrowband case because the broad frequency band and the tap-delay-line structure. So I develop a method to construct the signal subspace.
For coherent interference I extend the two stage array structure in narrowband case to broadband case, and compare its performance with spatial smoothing.
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