一種強(qiáng)干擾條件下微弱信號(hào)DOA估計(jì)的新方法
A Novel Algorithm for Weak Signals DOA Estimation under Intensive Interferences
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摘要: 給出了一種基于均勻線性陣列的既能抑制強(qiáng)烈干擾，又能同時(shí)進(jìn)行微弱信號(hào)DOA估計(jì)的算法。在已知強(qiáng)干擾源個(gè)數(shù)和入射方向的前提下，先使用改進(jìn)的波束形成方法，在子陣上進(jìn)行波束形成以抗干擾，再對(duì)加權(quán)后的子陣進(jìn)行微弱信號(hào)的DOA估計(jì)。該方法的優(yōu)點(diǎn)是當(dāng)干擾和希望信號(hào)處在同一個(gè)波束內(nèi)時(shí)，不需要提高信號(hào)的信噪比就可以正確地估計(jì)出信號(hào)的入射方向。理論分析和計(jì)算機(jī)仿真都表明該算法是有效的。
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關(guān)鍵詞:
- 抗干擾;波束形成;DOA估計(jì)
Abstract: A novel algorithm both for restraining intensive interferences and for estimating weak signals' DOA(Direction Of Arrival) information is presented on the basis of uniform linear array. Under the assumption knowing the number and directions of intensive interferences, first, the algorithm forms the beam on the sub-array level with the improved beam-forming method to constrain interferences; then, the algorithm estimates weak signals' DOA information based on all of these weighed sub-arrays. When both the desired signal and the interference are in the same beam, the merit of this algorithm shows higher estimation accuracy than that of high-resolution methods without improving the SNR for weak signal. Both the theoretical analysis and computer simulation indicate that the algorithm is effective. -
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