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A passive synthetic array (PSA) using a single moving sensor is formed to estimate direction of arrival (DOA). And co-prime array is used to form a virtual L-array. The impact of the passive synthetic aperture on the DOA estimation under different conditions is simulated and analyzed. Numerical simulations show that the initial time error has no obvious effect on the DOA estimation in the condition...
A passive synthetic array (PSA) using a single moving sensor is formed to estimate direction of arrival (DOA). And the signal model with velocity errors is constructed. By using MUSIC algorithm, the angle estimation performance is analyzed through numerical simulations under different velocity errors. With the increase of velocity error, resolution and accuracy of multi-target angle estimation decline...
In this paper, minimum redundancy multiple-input multiple-output (MR-MIMO) arrays - a class of thinned antenna arrays - are discussed. The concepts of MR-MIMO array design and almost difference sets (ADSs) are introduced, and an analytical method based on ADSs is proposed for MR-MIMO array designs. This method can quickly determine the locations of MR-MIMO arrays and require little computational cost...
In this paper, the antenna array design problem in minimum redundancy MIMO radars is addressed, which seeks to maximize the virtual array aperture for a given number of transmitting and receiving (Tx/Rx) elements. A hybrid optimization method combining cyclic difference sets (CDSs) with simulated annealing (SA) is proposed for the optimal design of Tx/Rx antenna arrays. Numerical results are also...
Antenna array configurations have significant influence on the radiometric sensitivity of aperture synthesis microwave radiometers. In this paper, we propose a minimum degradation array (MDA) for optimum sensitivity. First, the degradation factor (DF) is defined to characterize the effect of redundant spatial frequency samples formed by an array on the sensitivity. Aiming at minimizing DF, a simulated...
This paper presents circular array designs in aperture synthesis radiometers based on particle swarm optimization (PSO). The UV coverage of the interferometric array is analyzed, and the PSO algorithm is applied to improve the sampling efficiency of the circular array in the (u, v) plane. Benchmark examples are presented to illustrate the effectiveness of the PSO algorithm in designing circular arrays...
The calibration of a microwave Aperture Synthesis Radiometer (ASR) is necessary for high-quality passive microwave imaging. Existing external calibration methods have difficulties for calibration of ASRs with large arrays. In this paper, a data model of correlation matrix containing phase and amplitude errors is established. Based on the correlation matrix, a solar calibration method for ASR is proposed...
Aperture synthesis technique is a feasible means to provide high spatial resolution at low frequencies. But due to the impacts of system errors, time varying scenes, and different inversion algorithms, analytic studies of system performances are difficult or impossible, and the need of numerical simulation appears. In this paper, a signal-level simulator is presented. It covers brightness temperature...
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