Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1997-09-19
2000-02-29
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375343, 342386, H03D 100
Patent
active
060318813
ABSTRACT:
This invention involves a method for mitigating multipath effects in radio ranging systems which is based on searching for and finding a maximum likelihood estimate of range for a received signal in a signal ranging system. In determining the maximum likelihood estimate, the correlation process uses a high resolution step method in processing the received signal sample values to develop an estimation statistic. The estimation statistic using the correlations of the received signal is based on a new derived representative set of coefficients formed from a nonlinear combination of parameters of the received signal transformed into an invertible linear combination which allows solution of the maximization process of the estimation statistic. Additionally there is a method of constraining the relative amplitude of received secondary signals to obtain a refinement of the optimal solution of range. Also the method includes a process to reduce the magnitude of the processing required by the receiver by reducing the size of the overall sample of the signal that must be managed by the receiver. The method may be used in a signal environment where multiple secondary path signals are received by the signal ranging system.
REFERENCES:
patent: 4821294 (1989-04-01), Thomas, Jr.
patent: 5056106 (1991-10-01), Wang et al.
patent: 5414729 (1995-05-01), Fenton
patent: 5694416 (1997-12-01), Johnson
"Performance Evaluation of the Multipath Estimating Delay Lock Loop" by Townsend, et al. No date.
"Leica's Code and Phase Multipath Mitigation Techniques" by Hatch, et. al.
"Evaluation of GNSS Receiver Correlation Processing Techniques for Multipath and Noise Mitigation" by Van Dierendonck, No date.
Fisher Benjamin
Weill Lawrence
Chin Stephen
Jiang Lenny
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