Geolocation using time difference of arrival and long baseline interferometry

A non-transitory computer program product including one or more machine-readable mediums encoded with instructions that when executed by one or more processors cause a process to be carried out for emitter geolocation, the process comprising:

• calculating time difference of arrivals (TDOAs) of ground emitter radar pulses, within a dwell period, the TDOA calculation for a given radar pulse being based on the difference between an estimate of a first time of arrival of the given radar pulse as received by a first long baseline interferometer (LBI) antenna and a second time of arrival of the given radar pulse as received by a second LBI antenna;
• calculating an LBI phase wrap disambiguation factor based on (1) the calculated TDOAs, (2) an average of frequencies of the radar pulses received within the dwell period, and (3) an average of phase shifts of the radar pulses received within the dwell period, the phase shift of the given radar pulse being based on the difference between an estimate of a first phase of the given radar pulse as received by a first LBI antenna and a second phase of the given radar pulse as received by a second LBI antenna;
• calculating an LBI cone angle using the LBI phase wrap disambiguation factor;
• and
• mapping a curve of points onto an earth surface based on the calculated LBI cone angle, wherein a determination of the geolocation of the ground emitter is based on the curve of points.

A non-transitory computer program product including one or more machine-readable mediums encoded with instructions that when executed by one or more processors cause a process to be carried out for emitter geolocation, the process comprising:

• calculating TDOAs of ground emitter radar pulses, within a dwell period, the TDOA calculation for a given radar pulse being based on the difference between an estimate of a first time of arrival of the given radar pulse as received by a first antenna and a second time of arrival of the given radar pulse as received by a second antenna;
• calculating a cone angle based on an average of the TDOAs within the dwell period;
• and
• mapping a curve of points onto an earth surface based on the calculated cone angle, wherein a determination of the geolocation of the ground emitter is based on the curve of points.