Abstract
In the bistatic synthetic aperture radar (BiSAR) system, the deviation between two oscillators in different platforms will cause an additional modulation of BiSAR echoes. Therefore, phase synchronization is one of the key issues that must be addressed for the BiSAR system. The oscillator phase error model and the principle of phase synchronization are firstly described. The waveform diversity technology has been widely used in many fields, for example, the hearing aids device and the recognition of auditory input source in cocktail party problem. Inspired by this, an advanced phase synchronization scheme based on coherent integration and waveform diversity is proposed. The synchronization signal and radar signal are orthogonal signals which can be separated by using waveform diversity technique. After extracting the synchronization signal, the phase synchronization accuracy can be further improved by coherent integration. The transmission of synchronization signals between two synchronization antennas is analyzed, followed by the theoretical error analysis. Then, the processing of separating the echo signal and synchronization signal is described in detail. The simulation experiments are performed. The accuracy of phase synchronization can reach 1 degree, which verifies the effectiveness of the proposed synchronization scheme.
Highlights
Synthetic aperture radar (SAR) is an active remote sensing instrument which can provide high-resolution two-dimensional images independent of sunlight illumination and weather conditions [1]
In the bistatic SAR (BiSAR) system, any deviation between two oscillators in different platforms will cause a modulation of BiSAR echo
Phase synchronization is one of the key issues that must be addressed for the BiSAR system
Summary
Synthetic aperture radar (SAR) is an active remote sensing instrument which can provide high-resolution two-dimensional images independent of sunlight illumination and weather conditions [1]. A number of SAR-derived techniques have been developed, such as repeat-pass interferometry, tomography SAR, polarimetric SAR and so on [2]. These techniques have been widely used for Earth observation, they have some inherent limitations in monostatic SAR mode. Repeat-pass interferometry suffers from two main difficulties, temporal decorrelation and atmospheric disturbances, which reduce the accuracy of digital elevation measurement [3]. These two difficulties can be avoided by using the bistatic SAR (BiSAR), which offer a natural way to implement singlepass interferometry. The BiSAR system, separated with transmitter and receiver, has some other unique advantages, such as frequent monitoring, resolution enhancement and multi-angle scattering information, making it a promising and useful supplement to a classical monostatic SAR system [4]
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