Vehicle location system having enhanced position location proces

Details Vehicle location system having enhanced position location proces Vehicle location system having enhanced position location proces

1991-08-20

1992-11-24

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

342465, 342387, G01S 302

Patent

active

051666944

ABSTRACT:
Position location processing using a series of processing routines for enhanced position location in a hyperbolic ranging system adapted to more accurately indicate the position of mobile transmitters within the system. These routines incorporate data in an overdetermined system to refine the position estimate and speed up computation time. The processing utilizes all data received and filters out data caused by radio propagation measurement error that contributes to overall position error. It selects the optimum subset of data to process prior to performing time-intensive mathematical operations which results in a substantial reduction in computation time, allowing for many more overall position computations per second. The advantages of the present position location processing include its ability to incorporate all data received to reduce the overall position error. Processing filters that provide for data extraction and position verification enhance the accuracy and reliability of the position estimate. Because the filtering also extracts the optimum data for processing, the present processing permits location and identification of hundreds of transmitters and maintains the status of each.

REFERENCES:
patent: 4839656 (1989-06-01), O'Neill et al.
patent: 4876550 (1989-10-01), Kelly
patent: 5045860 (1991-09-01), Hodson

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