Communications: directive radio wave systems and devices (e.g. – With particular circuit – Digital processing
Patent
1990-05-01
1991-05-28
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Digital processing
342 99, 342192, 342194, G01S 1350
Patent
active
050198246
ABSTRACT:
A multistage estimator is provided for the parameters of a received carrier signal possibly phase-modulated by unknown data and experiencing very high Doppler, Doppler rate, etc., as may arise, for example, in the case of Global Positioning Systems (GPS) where the signal parameters are directly related to the position, velocity and jerk of the GPS ground-based receiver. In a two-stage embodiment of the more general multistage scheme, the first stage, selected to be a modified least squares algorithm referred to as differential least squares (DLS), operates as a coarse estimator resulting in higher rms estimation errors but with a relatively small probability of the frequency estimation error exceeding one-half of the sampling frequency, provides relatively coarse estimates of the frequency and its derivatives. The second stage of the estimator, an extended Kalman filter (EKF), operates on the error signal available from the first stage refining the overall estimates of the phase along with a more refined estimate of frequency as well and in the process also reduces the number of cycle slips.
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Adams Harold W.
Jones Thomas H.
Manning John R.
Sotomayor John B.
The United States of America as represented by the Administrator
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