Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1998-05-29
1999-11-09
Do, Diep
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324752, 364819, G01R 2302
Patent
active
059821647
ABSTRACT:
In a system for locating the position of a transmitter, a platform containing an antenna is moved through a measurement path. The frequency received by the antenna is measured at measurement points distributed along a measurement path. The frequency is measured by cross correlating coherent pulses of the received frequency signal. An inertial navigation system on the platform indicates the position of the measurement path. A computer determines estimated locations by non-linear least squares convergence starting from trial locations. The non-linear least squares convergence is based on the frequency equation for the received frequency ##EQU1## in which f.sub.0, is the transmitter frequency, V is the antenna velocity and r is the range of the transmitter. The computer evaluates a cost function derived from the frequency equation, for each location estimated by the non-linear least squares convergence and selects the estimated location with the lowest cost function as the best solution.
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Czarnecki Steven V.
Gerst Carl
Johnson James A.
Cogan Robert P.
Do Diep
Lockheed Martin Corporation
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