Passive Ranging for Infrared Search and Track System Mounted on an Aircraft

This paper presents two passive ranging algorithms viz. i. Extended Kalman Filter (EKF) in Modified Spherical Coordinates (MSC), ii. Pseudo Linear Estimator (PLE) for an Infrared Search and Track (IRST) system mounted on an aircraft. Detailed mathematical formulations for both algorithms are presented. Target-Aircraft relative simulation scenarios are generated, and the performance of algorithms has been presented. The robustness of the algorithms for sensor noise levels and aircraft maneuvers has been clearly brought out.