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Radiometer Scanning Patterns and Geospatial Scanners Overview

This chapter provides insights on various scanning patterns used in radiometers, including Boustrophedonic, raster, and step-stare scans. It also discusses the workings of geospatial scanners in different orbits. Learn about single-mirror and two-mirror scanners with parallel and angled scans. Additionally, channel separation schemes in ABI on GOES-R and the operational modes of SAR are covered.

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Radiometer Scanning Patterns and Geospatial Scanners Overview

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  1. Figures for Chapter 3 • Paul Griffith • 30 June 2019

  2. Notes Figures are provide in sequential order Figure numbers in current document have not been changed • Inserted figures have been numbered to indicate where they fall within the existing sequence • Example: 3.2.1 is located after existing Figure 3.2 and before existing Figure 3.3 • This is strictly to help editing – not a recommended numbering scheme • It is expected that all figures will be renumbered sequentially in the final document All figures have been included for clarity • All figures tagged in upper right to denote if they are unchanged, modified, or new • Unchanged figures are just screenshots – not originals

  3. Unchanged 3.1 Typical scheme of a scanning radiometer in LEO

  4. Unchanged 3.2 Schematic scanning from a spin-stabilized GEO

  5. New 3.2.1 Boustrophedonic, raster, and step-stare scan patterns Boustrophedonic Scan(“as the ox plows”) Raster Scan Step-Stare

  6. New 3.2.2 Single-mirror barrel-roll scanner: parallel scans to equator result in detector array image rotation; angled scans can be normal to detector array Scan line Equator Scan line Scan line Scan line Scan line Scan line Scanning parallel to equator(rotating detector array image) Scanning normal to array (tilted scan lines)

  7. New 3.2.3 Two-mirror orthogonal scanner: scans parallel to equator without detector array image rotation Scan line East-West North-South Scan line Equator Two-mirror orthogonal scanner Scan line Scans parallel to equator withoutdetector array image rotation

  8. Unchanged 3.3 Geometry of conical scanning

  9. Modified S1 Fold Mirror Exit Pupil W1 W2 CS W3 S2 VNIR Bands 1-6 MWIR Bands 7-11 3.4 Channel separation scheme in ABI on GOES-R Telescope Photons LWIR Bands 12-16 4 3 2 1 5 6 9 15 13 8 7 16 10 14 11 12

  10. Unchanged 3.5 Scheme of a Michelson interferometer emphasizing the two input and output ports

  11. Unchanged 3.6 Shape of the point spread function

  12. Unchanged 3.7 Sketch view of Soil Moisture and Ocean Salinity (SMOS) with MIRAS (left) …

  13. Unchanged 3.8 The overall system for radio occultation

  14. Unchanged 3.9 Two concepts for multiviewingscatterometers. …

  15. Unchanged 3.10 Enhancing along-track altimeter resolution by SAR-like signal processing

  16. Unchanged 3.11 Operating modes of SAR …

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