SAR-GMTI phasor sums and their impact on target velocity measurements

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Authors
  1. Livingstone, C.
  2. Dragosevic, M.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
The main focus of this document is the simple two aperture SAR-GMTI radar. A SAR signal model is developed from a phasor sum to illustrate the roles of the major components of a SAR signal including sampling ambiguities. The signal model is expanded to include the case of a two-aperture SAR-GMTI radar. A DPCA (displaced phase center antenna) model is used to describe moving target detection and an ATI (Along-track interferometry) model is used to discuss target motion estimation. The interactions between the moving target detection and motion estimation processes are described in terms of a simple target and clutter model and then discussions are generalized to more realistic cases to illustrate how the principles deduced from the simple model influence real-world observations. Radar sampling strategies are discussed in terms of sampling ambiguities and their impact on target detection. Physically large moving targets (much larger that the radar impulse response function width) are described as ensembles of clustered but independent, moving point targets. Some SAR-GMTI measurement examples are introduced to illustrate how the interactions between moving target detection and motion estimation processes influence the measurement outcomes. An extensive list of references is provided to guide further study.

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Report Number
DRDC-OTTAWA-TR-2011-177 — Technical Report
Date of publication
01 Nov 2011
Number of Pages
86
DSTKIM No
CA036802
CANDIS No
536463
Format(s):
Electronic Document(PDF)

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