第１ 节简述了二维ＳＡＲ的方位和距离高分辨率的方法。第２ 节论述了用干涉仪法获得成像单元的相位差以及三维成像的基础干涉条纹图。由相位差值和其他可测知值推导出目标高度。机载ＳＡＲ通常采用双天线，因此它一次飞行即能三维成像，称为单航过法。星载ＳＡＲ采用双天线很困难，已进行过的三维成像均为单天线双航过法。第３ 节讨论了测高误差。第４ 节指出了测高中遮挡和重叠的影响。第５ 节论述了如何选择参数仪相位值不模糊以及差相位值模糊怎样解开相位重叠。第６ 节说明了机载干涉仪ＳＡＲ理论上虽能得到很好的测高精度，但气流使机身产

In this paper section 1 briefly describes how to get the 2-D SAR's range and azimuth high resolution. section 2 describes interferometric SAR. The phase difference by using the interferometric method, and other known values to get the height value of the target. Airborne SAR uses two antenna method therefore it needs two paths through the target area in order to get the 3-D picture. section 3 describes the error in height measurement. section 4 describes shadowing and layover. section 5 describes how to choose the baseline B and the orientation a in order to avoid phase ambiguity and if it is ambiguous how to solve it by using phase unwrapping method. setion 6 describes the airborne SAR suffered from the problems of motion errors such as aircraft roll etc. and the method to correct it. setion 7 describes differential interferometry.section 8 briefly describes the future prospects. section 9 points out the 3-D interferometric principle may be used on sonar as well.

TN957.51