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Improved Coprime Linear Array Configuration for Moving Platform in DOA Estimation
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DOI：10.1109/LCOMM.2020.3029322.png)
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摘要
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Moving platform based coprime linear arrays (CLAs) have been studied in recent years. It is shown that by shifting a CLA a half wavelength, the resulting difference coarray can be regarded as the union of the difference coarray of the original CLA and its two shifted versions with one lag to the left and one lag to the right, respectively, filling the majority or all holes in the difference coarray. However, only the lags which are neighbors of holes are actually useful, while the shifts of the other lags generate lags which already exist, contributing then negligibly to the increase of the degrees of freedom (DOFs). In this letter, an improved CLA configuration for moving platform is proposed. By judiciously designing the sensor positions, all lags can be utilized to fill holes, consequently a difference coarray with more consecutive lags can be obtained. Compared with the original configuration, the proposed configuration can detect more sources with the same number of sensors and same length of array motion.
Keyword:
Sensor arrays
Frequency modulation
Direction-of-arrival estimation
Estimation
Covariance matrices
Narrowband
Phased arrays
Array motion
coprime linear array
difference coarray
DOA estimation
high DOFs
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