AIRBORNE SURVEILLANCE METHOD AND SYSTEM

Système de surveillance monté à bord d'un avion et procédé d'utilisation de ce système utilisant une antenne à recherche de direction par comparaison de phase (20), d'autres données, y compris les données d'altitude de l'aéronef cible produites par un répéteur en mode C (60) et une quantité d'autres facteurs pour déterminer la position de l'aéronef cible. Le système compense l'attitude de l'avion d'observation et effectue un filtrage de Kalman optimal, tout en évaluant l'ordre de grandeur de l'erreur dans chaque mesure, afin de compenser ces erreurs. An airborne surveillance method and system allows an observer aircraft to determine the position and change of position of a multiplicity of target aircraft and thus allows analysis of collision threats from these aircraft. The system uses a phase comparison direction finding antenna to determine direction of nearby ground based SSRs and all target aircraft of interest. The system further makes use of all other available data including Mode C transponder generated altitude information of the target aircraft, the altitude of the observer aircraft, the received signal strength of both the SSR beam and the received transponder signal, the time difference of arrival between the SSR interrogation signal and the response from the target aircraft, and a variety of other factors to determine the position of the target aircraft. The system compensates for the attitude of the observer aircraft and performs optimal Kalman filtering on the input data set to produce an estimate on target position based upon prior estimates and upon information contained in the data set while making estimates of the error magnitude of each measurement and compensating for these errors. The covariance matrix Q of the Kalman filter is adaptively vaired so as to optimize the estimate of the degree of correlation between various input values.