A Novel Doppler Frequency Model and Imaging Procedure Analysis for Bistatic ISAR Configuration With Shorebase Transmitter and Shipborne Receiver

In order to avoid bad bistatic geometry cases and offer better concealment and anti-interference ability, a novel kind of bistatic inverse synthetic aperture radar (ISAR) configuration, named shorebase-shipborne bistatic ISAR, is presented. In this paper, the Doppler frequency model of the received signal for shorebase-shipborne bistatic ISAR is proposed, when both the target and the receiver ship have nonstationary three-dimensional (3-D) rotational motion. An analysis of the Doppler shift and image aliasing induced by the receiver ship's rotational motion is given. To eliminate the effects of receiver ship's rotational motion, a new image reconstruction method in combination with range-instantaneous Doppler (RID) technique and rotational motion compensation is proposed. The simulated results demonstrate the effects of the receiver ship's rotational motion and the effectiveness of new image reconstruction method.

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