This work proposes and describes a modular and innovative beamforming network (BFN) to feed a nonequally spaced circular antenna array. The structure is based on a set of alternated power combiners and dividers that d...
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This work proposes and describes a modular and innovative beamforming network (BFN) to feed a nonequally spaced circular antenna array. The structure is based on a set of alternated power combiners and dividers that delivers a Gaussian-like amplitude distribution and coherent (in-phase) signals. A multiple beam antenna system to generate two main beams in the same aperture with a coherent network for a nonuniformarray with beam shaping and beam steering properties is simulated and analyzed. Furthermore, a comparative analysis based on uniform and nonuniformcircular antenna arrays fed by the proposed coherent network is conducted. The complex signals and the nonuniformcircular aperture are optimized using the well known differential evolution technique. Numerical experiments show the efficiency and improvement of the coherent network with a nonuniform aperture over uniform, with an advantage in average equal to 1.8dB of directivity and -2dB of side lobe level. Moreover, the simulation results exhibit an aperture reuse and complexity reduction of the proposed coherent network configuration compared with a conventional antenna array with direct feeding, where each main beam is shaped and steered with the half of control signal inputs.
For the non-uniformcircular antenna array, the algorithm based on multiple signal classification (MUSIC) is a high-resolution estimation algorithm on direction-of-arrival (DOA). This paper analyzes that the direction...
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ISBN:
(纸本)9781467370059
For the non-uniformcircular antenna array, the algorithm based on multiple signal classification (MUSIC) is a high-resolution estimation algorithm on direction-of-arrival (DOA). This paper analyzes that the direction finding precision of multiple signal classification (MUSIC) algorithm is under the different background signal-to-noise ratio (SNR), multi-path or mirror reflection, and different number of snapshots. At the same time, it simulates that the amplitude and phase inconsistency of super-heterodyne receiver channels effects on the direction finding precision of multiple signal classification (MUSIC) algorithm. The simulation results show that the MUSIC algorithm has higher direction finding precision, and meet the requirements of a direction finding system under certain snapshots and SNR measurement. This paper affords the effective use for a reference on the direction finding based on spatial spectrum estimation.
For the non-uniformcircular antenna array, the algorithm based on multiple signal classification(MUSIC) is a high-resolution estimation algorithm on direction-of-arrival(DOA).This paper analyzes that the direction fi...
详细信息
For the non-uniformcircular antenna array, the algorithm based on multiple signal classification(MUSIC) is a high-resolution estimation algorithm on direction-of-arrival(DOA).This paper analyzes that the direction finding precision of multiple signal classification(MUSIC)algorithm is under the different background signal-to-noise ratio(SNR), multi-path or mirror reflection, and different number of snapshots. At the same time, it simulates that the amplitude and phase inconsistency of super-heterodyne receiver channels effects on the direction finding precision of multiple signal classification(MUSIC)algorithm. The simulation results show that the MUSIC algorithm has higher direction finding precision, and meet the requirements of a direction finding system under certain snapshots and SNR measurement. This paper affords the effective use for a reference on the direction finding based on spatial spectrum estimation.
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