Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1996-10-07
1998-11-10
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342424, 342444, 342457, G01S 504
Patent
active
058350608
ABSTRACT:
In a long base line interferometer system for determining the position of a transmitter, the phase differences between the signal received by the antennas at each end of the base line are monitored as the interferometer moves through a measurement path to obtain phase difference measurements distributed along the measurement path. A cost function involving measuring the sum of the squares of the differences between measured values and predicted values is determined for each of a set of trial location grid points and the grid point with the lowest cost function is selected as a starting point for determining the transmitter location by least squares convergence. In evaluating the cost function, the predicted values are obtained from the equation: ##EQU1## in which .o slashed..sub.0 is unknown phase offset and the X and Y coordinates of the transmitter are unknown. The least squares convergence is carried out by iteratively adding corrections to predicted values for the unknowns until convergence occurs.
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Czarnecki Steven V.
Gerst Carl
Gray Clifford M.
Johnson James A.
VerWys George A.
Lockheed Martin Corporation
Phan Dao L.
Tarcza Thomas H.
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