Abstract
Echo cancellation is an ingenious method that protects the target of interest (TOI) by cancelling target echo at radar receiver with an active source. Recently the cancellation method using frequency and time-delay modulation has been proposed, considering the unavoidable processing time for the canceler when synthetic aperture radar (SAR) transmits large time bandwidth product signals such as linear frequency modulation pulses. Then the cancellation signal can cancel out the target echo even when it lags behind. However, echo cancellation also requires precise amplitude match of cancellation signal and target echo at SAR receiver. Amplitude match relies on accurate transmitting power calculation, which is difficult to guarantee considering prior information errors. In the presence of amplitude mismatch, the target echo cannot be completely cancelled thus remains visible in the SAR image. In this paper, we proposed an improved echo cancellation method based on nonperiodic interrupted sampling modulation, which produces high-level side lobes performing as a continuous jamming strip along range direction after matched filtering processing. By applying the proposed method, the residual of TOI in SAR image is covered by the jamming strip, thus a more robust echo cancellation is obtained in the presence of amplitude mismatch. Measured SAR data simulations demonstrate the effectiveness of the proposed method.
Published Version
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