Multiplatform ambiguous phase circle and TDOA protection emitter location
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United States of America Patent
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Dec 7, 1999
Grant Date -
N/A
app pub date -
Jun 1, 1998
filing date -
Jun 1, 1998
priority date (Note) -
Expired
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Abstract
A method and system for determining the geolocation--i.e., the latitude, longitude, and altitude--of a stationary RF signal emitter from two or more moving observer aircraft. The observers receive signals from the emitter and the system measures the phase difference between the signals. The observers then perform pulse time of arrival (TOA) measurements over a predetermined clock interval, and calculate the time difference of arrival (TDOA) of corresponding, same-pulse, emitter signals. Based on geometric relationships, the system creates a series of circular lines of position (LOPs) for each observer, and computes hyperbolic LOPs based on the TDOA calculations. The system determines emitter location from the intersection of the hyperbolic LOPs and the circular LOPs.
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