Abstract
The spatial separation of the transmitter and receiver in Bistatic Synthetic Aperture Radar (BiSAR) makes it a promising and useful supplement to a classical Monostatic SAR system (MonoSAR). This paper proposes a novel integrated time and phase synchronization strategy for a multichannel spaceborne-stationary BiSAR system. Firstly, the time synchronization strategy is proposed, which includes Pulse Repetition Frequency (PRF) generation under noisy conditions, multichannel calibration and the alignment of the recorded data with the orbital data. Furthermore, the phase synchronization strategy, which fully considers the deteriorative factors in the BiSAR configuration, is well studied. The contribution of the phase synchronization strategy includes two aspects: it not only compensates the phase error, but also improves the Signal to Noise Ratio (SNR) of the obtained signals. Specifically, all direct signals on different PRF time can be reconstructed with the shift and phase compensation operation using a reference signal. Besides, since the parameters of the reference signal can be estimated only once using the selected practical direct signal and a priori information, the processing complexity is well reduced. Final imaging results with and without compensation for real data are presented to validate the proposed synchronization strategy.
Highlights
The Bistatic Synthetic Aperture Radar (BiSAR) system is defined as a radar system where the transmitter and receiver are spatially separated [1]
Considering that the non-ideal hardware implementations of the experiments affect the quality of the BiSAR images, our synchronization strategy based on the second idea aims at canceling out the bistatic phase error and improving the Signal to Noise Ratio (SNR)
In order to address the problem of synchronization and image quality deterioration in the multichannel BiSAR system, an integrated time and phase synchronization strategy has been presented
Summary
The Bistatic Synthetic Aperture Radar (BiSAR) system is defined as a radar system where the transmitter and receiver are spatially separated [1]. The last few decades have seen the appearance of a number of bistatic radar concepts that use an existing system as a source of opportunity For these noncooperative BiSAR configurations, synchronization issues are more significant because even the PRF signal needs to be recovered [9]. The phase error can be eliminated by compressing the echo signal in the range direction using the direct signal as the matched filter [24] Considering that the non-ideal hardware implementations of the experiments affect the quality of the BiSAR images, our synchronization strategy based on the second idea aims at canceling out the bistatic phase error and improving the SNR. The strategy is validated by comparing BiSAR images with and without compensations
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