机载SAR实时成像系统自聚焦方法研究

Implementation of Auto-Focus Algorithms on Aircraft SAR Real-Time Imaging Systems

发展我国自主产权的机载SAR(合成孔径雷达 )实时成像系统 ,对于军事国防、资源探测、灾害预报等领域均具有重要的意义 在SAR成像算法中 ,自聚焦的好坏是影响图像分辨率的关键因素 但是因为自聚焦算法的复杂性 ,国内目前尚未有效地解决它在实时环境中的实现问题 ,从而使得实时成像的质量比较差 提出了一种利用GPS(全球定位系统 )数据改善机载SAR实时成像系统自聚焦性能的实现方法 ,并在自主研制的机载SAR实时成像系统上实现 。

Synthetic aperture radar (SAR) is an important tool for the collection of all-weather image data It is widely used in the fields of disaster forecasting, military inspection and resources investigation, etc For high resolution image formation, auto-focus methods must be used to remove the phase errors that are the main cause of degradation of quality of SAR image However, the complexity of auto-focus algorithms makes it difficult to realize in real-time environment A novel method is put forward to improve the auto-focus algorithms by using global positioning systems (GPS) data Moreover, the implementation of these design methods in the aircraft SAR real-time imaging system are discussed in detail