1. The RCS function of aspect angle is analyzed. Based on the characterization of object model's RCS, A new method for estimation of space object shapes from RCS time-series is proposed.

2. Firstly, with the consideration of the frequency and aspect angle dependent parameters of the low frequency UWB-SAR, the radar equation for calibration is proposed.

3. That spirit is of positive theoretical and practical significance for national rejuvenation and development either from the aspect angle of history, or of reality.

4. Experiments for recognition of five kinds of aircraft targets are carried out. Results show that high classification rate can be achieved within relatively wide range of target aspect angle.

5. The principle of measurement and mathematical model of the solar aspect angle were given and a scheme of practicable digital telemetering system for the measurement was also propounded.

6. A digital model of the target is established, which have effect on the echos amplitude and shape according to the angle of view, and simulated target echo signal under the different aspect angle.