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直升机载合成孔径雷达(SAR)是微波成像的潜在重要发展方向。由于直升机平台具有高频振动的特殊性,目标在SAR图像上会呈现出对称重影,严重影响图像的判读与应用。针对该难题,文中对直升机载SAR回波信号的额外调制进行理论分析和建模,并结合成像处理流程,提出一种高频相位误差精准补偿方法。实测数据验证结果表明,该方法可实现直升机载SAR的正常、高质量成像,为直升机载SAR成像提供了重要技术支撑。
Helicopter mounted synthetic aperture radar (SAR) is a potentially important development direction for microwave imaging. Due to the particularity of helicopter platform with high-frequency vibration, the target will appear symmetrical ghost on the SAR image, seriously affecting the interpretation and application of the image. In response to this problem, this paper analyzes and models the additional modulation of helicopter-borne SAR echo signals, and proposes a precise compensation method for high-frequency phase errors based on the imaging process. The experimental results show that this method can achieve normal and high quality imaging of helicopter SAR and provide important technical support for helicopter SAR imaging.