Mobile 2-, 3-D Radar Network Error Registration Model

Abstract

Registration is the act or process of simultaneously entering information about radar offset biases and attitude biases of Inertial Navigation System (INS) in a common reference frame known as radar registration frame. The variables that describe the registration are defined as radar offset biases and attitude biases. The mathematical relationship that shows the formal relation among the registration variables or radar offset biases and attitude biases is defined as the registration equation(s). For mobile 2-, 3-D radar networks, in order to improve the accuracy of the registration equations, the earth-centered earth-fixed (ECEF) coordinate system is used as the intermediate frame to get to the registration frame. Since a 2-D radar model has no comprehensive 3-D information of the target when establishing the registration equations, three different methods are discussed, each method differently and uniquely pinpoints to a reference point. The latter instead of the true target coordinates is used to establish the registration equations. The errors of the reference points are unavoidable and will be embodied in the estimation errors of all the biases. The mobile 2-D radar network registration in ECEF frame can also be included in this methodology. Simulation results show that all three methods can be applied well for registration, and for a certain condition, one of them outperforms the others.