Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Iff or sif
Patent
1988-11-14
1989-06-06
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Iff or sif
342 54, G01S 1380
Patent
active
048375756
ABSTRACT:
A secure identification system for identifying a potential target in a battlefield environment as being either a friend or a foe is disclosed. An interrogator produces two interrogation pulses, such as laser flashes, aimed at the target and separated from each other by a randomly determined period of time. The target detects the two interrogation pulses, measures elapsed time between the two pulses, and prepares a reply signal for transmission which is controlled by the elapsed time. Frequency, pulse width, and transmission delay parameters are each controlled in a substantially random, but predetermined manner in response to the elapsed time. The interrogator has a receiver and qualifier which receive reply signals and define expected values for the controlled parameters. An indication is provided concerning whether the target represents a friend or a foe based on received reply signals at the interrogator.
REFERENCES:
patent: 2592777 (1952-04-01), Williams
patent: 3667054 (1972-05-01), Nelson
patent: 3949397 (1976-04-01), Wagner et al.
patent: 4074263 (1978-02-01), Sullivan, Jr.
patent: 4075631 (1978-02-01), Dumez
patent: 4144534 (1979-03-01), Prickett et al.
patent: 4194201 (1980-03-01), Stein
patent: 4198632 (1980-04-01), Bishop
patent: 4213128 (1980-07-01), Longinotti
patent: 4322729 (1982-03-01), Honold et al.
Bogacz Frank J.
Motorola Inc.
Sotomayor John B.
Tarcza Thomas H.
LandOfFree
Identification 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 Identification system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Identification system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-42791