NDLI: Analytic Yaw–Pitch Steering for Side-Looking SAR With Numerical Roll Algorithm for Incidence Angle

Content Provider	IEEE Xplore Digital Library
Author	Scharf, D.P.
Copyright Year	1980
Abstract	In side-looking synthetic aperture radars (SARs), the rotation of the Earth introduces a corrupting residual Doppler shift. Recently, methods using both yaw and pitch maneuvers have been introduced to cancel residual Doppler. In this paper, the condition for zero residual Doppler independent of a coordinate system is used as a starting point to derive formulas for yaw-then-pitch steering angles that achieve zero residual Doppler for strip-mode SAR. The advantage is that the resulting formulas are analytic in the position and velocity of the radar vehicle. In addition, the magnitude of residual Doppler due to both the offset of the radar phase center from the vehicle center of mass and an ellipsoidal Earth is bounded. To take advantage of the final degree of freedom in roll, a bisection-based roll algorithm is presented that achieves a desired radar incidence angle. The algorithm assumes an ellipsoidal Earth but can incorporate digital elevation and geoid models. Finally, numerical examples illustrate yaw-then-pitch steering, the sensitivity of these angles to the specific orbit, and calculation of the roll angle.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	3587
Ending Page	3594
Page Count	8
File Size	793839
File Format	PDF
ISSN	01962892
Volume Number	50
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Doppler radar Doppler effect Earth Vectors Vehicles Orbits synthetic aperture radar (SAR) Attitude control
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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