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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，但气流使机身产生俯仰、横滚和偏转，因此必须设法解决气流影响问题。第７节讨论了差分干涉仪有可能对地震和火山喷发等重大灾害作出事前预报。第８节简述了发展趋势。第９ 节指出了三维成像的机理同样可在声纳上应用。
Section 1 briefly describes the method of high resolution of azimuth and distance of two-dimensional SAR. Section 2 discusses the phase difference of the imaging unit and the basic fringe pattern of the three-dimensional imaging obtained with the interferometer. The target height is derived from the phase difference and other measurable values. Airborne SAR usually employs a dual antenna, so it can be three-dimensionally imaged in one flight, a single-flight approach. It is very difficult to use dual antenna for spaceborne SAR. The three-dimensional imaging that has been carried out is single-antenna double-homing method. Section 3 discusses the elevation error. Section 4 points out the effects of occlusion and overlap in altimeter. Section 5 discusses how to choose the parameters of the instrument phase value is not fuzzy and the phase difference fuzzy value how to solve the phase overlap. Section 6 shows that the theory of airborne interferometer SAR, although very accurate in terms of height accuracy, can cause pitching, roll and deflection on the fuselage and therefore must address the air flow effects. Section 7 discusses the possibility of using differential interferometers to anticipate major disasters such as earthquakes and volcanic eruptions. Section 8 outlines the trends. Section 9 states that the same three-dimensional imaging mechanism can also be applied to sonar.