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Multistage estimation of received carrier signal parameters under very high dynamic conditions of the receiver

  • US 5,019,824 A
  • Filed: 05/01/1990
  • Issued: 05/28/1991
  • Est. Priority Date: 05/01/1990
  • Status: Expired due to Fees
First Claim
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1. A multistage estimator for the parameters of a received carrier signal experiencing at least Doppler and Doppler rate due to high dynamics in relative motion between a receiver and a transmitter of said signal, said signal being phase modulated at times by unknown data, and where the parameters of interest include phase, frequency and frequency derivatives, comprising a plurality of estimation stages connected in cascade for successively reducing estimation errors due to said dynamics, the first of said stages comprising means for estimating parameters of relatively high dynamic signals with relatively high estimation errors as compared to succeeding stages, each succeeding stage comprising means for yielding smaller estimation errors of parameters of lower dynamic signals, successive ones of said estimation stages averaging the received carrier signal over progressively longer intervals during which parameters of the estimation process remain nearly constant, thereby progressively reducing the effects of noise.

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