Method and apparatus for finding aircraft position by integratin

Details Method and apparatus for finding aircraft position by integratin Method and apparatus for finding aircraft position by integratin

1995-02-02

1996-12-31

Teska, Kevin J.

Boots, shoes, and leggings

364456, 364460, 364449, 342 25, 342195, 342357, G01S 1390, G06F 1710

Patent

active

055900445

ABSTRACT:
A method and apparatus for short-range position determination of aircraft, used for preventing errors in radar mapping from position inaccuracies, finds velocity in the x-direction (flight direction) by integrating accelerometer outputs. The accelerometer values are averaged over a time interval and then the average is subtracted from the instantaneous signal value; this difference, called adjusted acceleration, is integrated over time to yield a velocity. In turn, this velocity is time-averaged and the time average is subtracted from the instantaneous velocity. The resulting adjustment velocity is subtracted from the output of aircraft speedometer, and the difference is used to generate estimates of the average aircraft speed and acceleration by the method of least squares. These estimates are used to create a speed correction term for correcting the flight speed. The same process is used for positions in the y-direction and z-direction (vertical), except that an additional integration, time-average, and subtraction are involved for each.

REFERENCES:
patent: 3702477 (1972-11-01), Brown
patent: 5166688 (1992-11-01), Moreira
patent: 5193064 (1993-03-01), Maki
patent: 5216611 (1993-06-01), McElreath
patent: 5327140 (1994-07-01), Buckreuss
Tienmeyer, B., Precision Navigation with an Integrated Navigation System, Journal Of Flight Sciences And Space Research, vol. 16, No. 4, pp. 257-262, Aug. 1992.

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