Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1995-06-07
1996-06-11
Eldred, J. Woodrow
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342107, 342114, 342146, 342195, 342 95, G01S 1300
Patent
active
055259952
ABSTRACT:
In a system for detecting the position and trajectory of a target, Doppler measurements from a bistatic continuous wave radar system are used exclusively to provide information about the target. Radar signals are transmitted to the target by a plurality of transmitters and at least one receiver is provided to receive the signals from the target and make Doppler measurements. A nonlinear least squares estimator is used to estimate the initial target position and a Kalman filter is used to predict the target trajectory from the initial position assumed by the NLS estimator and from the Doppler measurements. The Kalman filter also generates a set of predicted Doppler measurements from the predicted trajectory. The nonlinear least squares estimator is used to compute a correction to the estimated initial position from partial differentials of the initial position and from the differences between the predicted and actual Doppler measurements. The difference between the actual Doppler measurements and the predicted Doppler measurements are also used to generate a test statistic as an indication of the accuracy of the predicted trajectory.
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Eldred J. Woodrow
Loral Federal Systems Company
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