Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Iff or sif
Patent
1978-02-17
1989-08-29
Tubbesing, T. R.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Iff or sif
342 50, G01S 1378
Patent
active
048621765
ABSTRACT:
The IFF system uses basic identification codes which are transmitted between an interrogator and a responder. The basic codes are chosen in dependence upon the time and position of the interrogator or responder at the time of choice. In one version of the system, the lifetime of a code is less than or equal to the propagation time of a radio signal for a given maximum range between the interrogator or responder. Interactive interrogation may also take place using codes chosen in the same way as the basic codes. Local information may also be transmitted between the interrogator and transponder. An example of apparatus for performing these operations transmits basic or other codes together with a time code defining the time of production of the basic or other codes. It is not essential to transmit a time code in some circumstances. Position and time information may be gained from an external communications system.
REFERENCES:
patent: 3750163 (1973-07-01), Hecker
patent: 3860922 (1975-01-01), Wagner
patent: 3949397 (1976-04-01), Wagner et al.
patent: 4194201 (1980-03-01), Stein
patent: 4322729 (1982-03-01), Honold et al.
EMI Limited
Tubbesing T. R.
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