5. amplitude and phase

6. coherence and pixel matching

8. resolution: optical vs. microwave

10. 2-D Aperture

11. range resolution  - look angle H - spacecraft height  - pulse length
C speed of light (sound)

12. azimuth resolution focussed unfocussed L - length of radar antenna Ra
L length of radar antenna
 nominal slant range H/cos
  wavelength of radar
unfocussed
focussed

17. How is the image focused in the computer?

18. SAR processor

21. SAR processor

22. Range Compression

28. phase history of point reflector
parabolic approximation to range history
Least-squares fit of range history for each point in DEM provides both the accurate position in range azimuth space and the Dopper centroid and rate parameters needed to focus the image. This analysis only needs to be applied to the master image.

31. SAR processor

33. amplitude image