An Antenna Array-Based Approach toAttitude Determination in a JammedEnvironment

摘要

This paper develops the mathematical basis for a GPSrnbased attitude determination (AD) system that performsrneven in the presence of strong external interference. Al-rnthough GPS receivers provide some inherent tolerance tornjamming, realistic jammer powers can corrupt or degradernthe attitude measurements obtained from the standardrnphase di?erencing approach. To challenge this we presentrna generic adaptive antenna array and receiver design thatrnprovides the necessary data for both position location andrnattitude determination in a jammed environment. Fromrnthe receiver data we develop two new estimators for the an-rntenna attitude, both using the concepts of maximum like-rnlihood estimation. Finally, simulation based performancernresults of the two estimators are presented for various an-rntenna topologies and interference scenarios, showing thatrnthey o?er a signiˉcant improvement over the conventionalrnattitude determination methods.