Improved height above target (hat) measurement algorithm

Details Improved height above target (hat) measurement algorithm Improved height above target (hat) measurement algorithm

1997-10-27

1998-11-03

Pihulic, Daniel T.

Communications: directive radio wave systems and devices (e.g.,

Determining distance

Height finder

342 25, G01S 1308

Patent

active

058315632

ABSTRACT:
A method for measuring the height of an aircraft above a target. An aircraft or platform is provided with a synthetic array radar (SAR) system that is used to designate a target. The aircraft performs a constant g vertical maneuver followed by a second constant g vertical maneuver whose incremental acceleration is equal in magnitude to the first maneuver and has opposite sign. The maneuvers are out-of-plane relative to a plane containing the velocity vector of the aircraft and the target. The maneuvers correspond to a push-over maneuver followed by a pull-up maneuver. SAR map data is collected during the maneuver that includes the designated target. Quadratic phase errors contained in the collected SAR map data are measured. The height of the target relative to the ground plane of focus of the SAR system is computed using the quadratic phase errors.

REFERENCES:
patent: 5448241 (1995-09-01), Zeoli et al.

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