Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1975-09-08
1977-02-08
Griffin, Robert L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
325 4, 340356, H04B 100
Patent
active
040074226
ABSTRACT:
A system for generating a special calling signal to be transmitted from an aircraft to a ground station comprising two parts of repeated groups of 7-unit binary code signals, each of which parts or groups has a constant ratio of 1 and 0 value bits, but has a different ratio for each part or group. The first part or group comprises alternating signals of "idle time" with two successive signals representing the tens and units digits of the call number of one of a hundred different ground stations to be called. This alternate sequence of tens and units signals is repeated a sufficient number of times so as to avoid any error in the reception of a signal from this part and also to place the receiving ground station in phase and synchronism with the calling station in the aircraft. Then the second part or group of the whole calling signal is transmitted which second part comprises three successive separate message signals which are alternately repeated in succession every fifth signal interval. These three message signals can indicate to the ground station, for example, the sector in which the calling station or aircraft is located, the modulation system to be applied for the traffic to follow, and the identification of the office to which the traffic is to be directed.
REFERENCES:
patent: 3207851 (1965-09-01), Fukinuki
patent: 3510777 (1970-05-01), Gordon
patent: 3532987 (1970-10-01), Turriere
patent: 3596002 (1971-07-01), Ohnsorgz
patent: 3596181 (1971-07-01), Dowling
"Coding and its Application in Space Communications", IEEE Spectrum v. 7, No. 6, June 1970, pp. 47-58.
De Staat der Nederlanden, te Dezen Vertegenwoordigd Door de
Griffin Robert L.
Kirk Hugh A.
Ng Jin F.
LandOfFree
Method and apparatus for calling a ground station by an aircraft does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for calling a ground station by an aircraft, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for calling a ground station by an aircraft will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1215426