Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1986-04-30
1989-02-21
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
364449, 455133, G01S 302, G01C 2100, H04B 1116
Patent
active
048069400
ABSTRACT:
An aircraft navigation system supporting a plurality of navigation modes. An error estimator for each navigation mode provides an estimated navmode error signal representative of an estimate of the error in the position signal generated by the associated navmode. A navigation mode selector enables the navmode having the smallest estimated navmode error signal that is consistent with procedure specified navaid criteria. The navmode computed position signal is processed through a low pass position filter. The estimated navmode error signal associated with the selected navmode is processed through a low pass position error filter having the same time constant as the low pass position filter to provide an estimated position error. The estimated position error is utilized in providing the INS and DEAD RECKONING navigation as well as to set a threshold for estimated navmode error signals sensor data validation.
REFERENCES:
patent: 4071744 (1978-01-01), Pollock
patent: 4459667 (1984-07-01), Takeuchi
patent: 4533991 (1985-08-01), Georgio
patent: 4571685 (1986-02-01), Kamoshida
Zimmerman, William; "Optimum Integration of Aircraft Navigation Systems"; IEEE Trans. on Aerospace and Electronics Systems; vol. AES-5, No. 5; Sep. 1969.
Harral Blake G.
Reed Michael D.
Blum Theodore M.
Honeywell Inc.
Issing Gregory C.
Jensen Roger W.
Levine Seymour
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