Patent ID: 6727851
Filing Date: 2004-04-27
Classification: G01S

Abstract:
A system for determination of the location of emitters generating electromagnetic signals, the system being operationally disposed on an aircraft, the system having incorporated therein a computer, a multi-channel receiver, an inertial navigation system, and at least two receiving antennae, comprising the steps of:a) receiving selected emitter signals via the receiving antennae; b) formulating an emitter location grid; c) deriving a hypothetical Delta Phase Rate, or rotational Doppler, for each grid point based upon the dynamics of the host platform; d) deriving an actual Delta Phase Rate from said received emitter signals; e) comparing said hypothetical Delta Phase Rate to said actual Delta Phase Rate for hypothetical emitter locations and calculating the discrepancy between them; f) accumulating over a selected interval of time said compared squared discrepancies for a plurality of points in said grid; and g) determining a prediction of the emitter location via said accumulated discrepancies.