Name
Title | ||
|---|---|---|
Interferometric alignment of the X-SAR antenna system on the space shuttle radar topography mission |
Abstract | ||
|---|---|---|
The on-orbit alignment of the antenna beams of both the X-band and C-band radar systems during operations of the shuttle radar topography mission/X-band synthetic aperture radar (SRTM/X-SAR) was a key requirement for achieving best interfer- ometric performance. In this paper, we consider the X-SAR an- tenna beam alignment in azimuth. For a single-pass cross-track SAR interferometer, we establish the relation between yaw and pitch misalignment of the antenna beams and the resulting rela- tive shift of the Doppler frequency bands. This relation is used to provide solutions for the mechanical adjustments of the outboard antenna and electronic beam steering to correct for azimuth mis- alignment. Furthermore, the effects of the X-SAR effective out- board antenna pattern on the azimuth beam alignment are ana- lyzed. As a result, a so-called "relaxing" factor is derived, which increases the limit for the difference in antenna azimuth angle with respect to the requirement on spectral overlap, and hence spatial interferogram resolution. However, we also show that the align- ment requirement is driven by the constraint on decreasing the az- imuth ambiguity-to-signal ratio (AASR) for the effective outboard antenna pattern to reduce the resulting additional height error. The strategy for misalignment determination and correction is pre- sented, and results of the analysis of the in-flight X-SAR antenna beam alignment are discussed. |
Year | DOI | Venue |
|---|---|---|
2002 | 10.1109/TGRS.2002.1010887 | IEEE T. Geoscience and Remote Sensing |
Keywords | Field | DocType |
geodesy,geophysical techniques,remote sensing by radar,spaceborne radar,synthetic aperture radar,terrain mapping,topography (Earth),C-band,InSAR,SAR,SHF,SRTM,Shuttle Radar Topography Mission,Space Shuttle,X-SAR,X-band,antenna beam,azimuth misalignment,cross-track SAR interferometer,electronic beam steering,geophysical measurement technique,interferometric alignment,land surface topography,on-orbit alignment,radar antenna,radar remote sensing,spaceborne radar,synthetic aperture radar,terrain mapping | Antenna (radio),Periscope antenna,Antenna measurement,Radiation pattern,Synthetic aperture radar,Remote sensing,Optics,Fan-beam antenna,Beam waveguide antenna,Mathematics,Antenna aperture | Journal |
Volume | Issue | ISSN |
40 | 5 | 0196-2892 |
Citations | PageRank | References |
4 | 0.96 | 7 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Dirk Geudtner | 1 | 95 | 11.12 |
| Manfred Zink | 2 | 7 | 2.60 |
| Christoph Gierull | 3 | 4 | 0.96 |
| Scott Shaffer | 4 | 6 | 1.72 |