Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1987-04-13
1989-04-18
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342146, 364449, G01S 302, G01S 1308, G01S 2100
Patent
active
048231371
ABSTRACT:
A radio navigation system is disclosed which uses multiple fixed frequencies for calculating the bearing and distance of a local station from a central station. The central station has a receiver and an array of fixed, directional antennas all transmitting signals at different frequencies. The local station has a transmitter for transmitting a query signal to the central station, a plurality of local receivers to receive signals from the antenna array, and a stored-program processor. Each of the local receivers operates at a fixed frequency substantially equal to the frequency at which its respective central transmitter and central antenna is operating. A stored-program processor measures the elapsed time between receipt of the query signal from the local station and receipt of a navigational signal from the central transmitters and, using this data, calculates the distance between the local station and the central station. The stored-program processor also compares the relative signal strengths of the signals received by the local station from the various antennas in the antenna array of the central station and, using this data, calculates the bearing of the local station from the central station.
REFERENCES:
patent: 2257320 (1941-09-01), Williams
patent: 2402410 (1946-06-01), Kear
patent: 2404501 (1946-07-01), Kear
patent: 2616076 (1952-10-01), Lyman et al.
patent: 3020546 (1962-02-01), Jolliffe
patent: 3095566 (1963-06-01), Dethloff et al.
patent: 3349399 (1967-10-01), Bohm
patent: 3648285 (1972-03-01), Sanders
patent: 3721950 (1973-03-01), Jorgensen et al.
patent: 4017860 (1977-04-01), Earp
patent: 4203114 (1980-05-01), Gerst et al.
patent: 4494119 (1985-01-01), Wimbush
"Navigation and Positioning Report", Ocean Industry, May 1986, vol. 21, No. 5, pp. 19-49.
Blum Theodore M.
Cain David
LandOfFree
Multiple-fixed-frequencies navigation system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiple-fixed-frequencies navigation system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple-fixed-frequencies navigation system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2399102