Computation of aircraft geometric height under radar surveillance for non-level flights

A new aircraft geometric height computation system based on a secondary surveillance radar (SSR) and an omni-directionat radar has recently been presented. One interesting aspect of this system is that it employs a simple analytical method to estimate and compensate for observable systematic errors, mainly created by the aircraft transponder. Herein, this off-line processing algorithm is extended to cover non-level flights by augmenting the aircraft vertical motion model.