Abstract
In traditional localization methods for synthetic aperture radar (SAR), the range sum estimation and Doppler centroid estimation (DCE) are required. The DCE error can influence the localization accuracy greatly. In addition, the target height information cannot be obtained by these methods. In this paper, a three-dimensional localization method for multistatic SAR based on the numerical range-Doppler (RD) algorithm and entropy minimization principle is proposed. In this method, the raw data from each transmitter and receiver (T/R) pair are focused by the numerical RD algorithm with the initial location value of the reference target. Then, Newton iteration is used to solve the target location value with the information of the bistatic range sum (BRS) in different SAR images with respect to different T/R pairs. Generally, the initial location value of the reference target is not accurate, and it can influence the imaging quality and accuracy of other target locations. We use entropy to measure image quality and iterate imaging with the new location value of the reference target, until the entropy gets the minimum value. Therefore, we can get the optimal location value of the reference target, which can make image entropy reach the minimum. Finally, all targets can be located by the Newton iteration method with their BRS in each T/R pair that are obtained from the images with minimum entropy. Compared with traditional localization methods for monostatic SAR, the proposed method not only effectively eliminates the influences of DCE errors, but also can get the target height information. Therefore, it improves the localization accuracy and can achieve three-dimensional localization. The effectiveness of the localization approach is validated by a numerical simulation experiment.
Highlights
Multistatic synthetic aperture radar (SAR) has more than one transmitter and receiver, which makes it obtain more information of targets at different angles of view
This paper describes a localization method for multistatic SAR
A localization method for multistatic SAR is proposed in this paper
Summary
Multistatic synthetic aperture radar (SAR) has more than one transmitter and receiver, which makes it obtain more information of targets at different angles of view. In [15,16], TOA estimation algorithms are proposed to improve the estimation accuracy As another main influence factor, time synchronization is a big challenge for the application of the multistatic radar system, as well as multistatic SAR. This paper describes a localization method for multistatic SAR It can eliminate the influences of Doppler centroid estimation (DCE) errors and improve the localization accuracy. This method can be arranged into four steps: (1) the raw data from each T/R pair are focused by the numerical RD algorithm with the initial location value of the reference target; (2) Newton iteration is used to solve the target location value with the information of BRS in different SAR images with respect to different.
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