Radar transponder

Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Radar transponder only

Reexamination Certificate

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C342S042000, C342S044000

Reexamination Certificate

active

10514862

ABSTRACT:
Transponders, receivers and position determining systems are described. In one embodiment, a transponder includes (i) an on-board receiver and associated receiving antenna for receiving incoming radar pulses in a first frequency band at an unknown pulse repetition rate, (ii) means for calculating the pulse repetition rate, (iii) a frequency synthesizer for generating a signal in a second frequency band, (iv) modulation means for modulating the signal generated by the frequency synthesizer so as to encode information into the signal, and (v) a transmitter and associated transmitting antenna for transmitting said modulated signal, wherein the transmitted signal is synchronized with the calculated pulse repetition rate of the incoming radar pulses, and modulation of the transmitted signal is such that accurate positioning of the transponder can be determined at a remote receiver.

REFERENCES:
patent: 3839719 (1974-10-01), Elwood
patent: 3988734 (1976-10-01), Elwood
patent: 4143373 (1979-03-01), Chernick
patent: 2005/0200515 (2005-09-01), Cherniakov
patent: 0 056 297 (1982-07-01), None
patent: WO 3100457 (2003-12-01), None
“Design of Transponder Signals and Recievers for Automatic Vehicle Location and Identification Systems”, Donaldson, R., Communications, IEEE Transactions on vol. 23, Issue 5, May 1975 P(s): 489-500.
Probanz, Carl W. et al., “A Microwave Non-Contact Identification Transponder Using Subharmonic Interrogation”, Dept of Electrical Engr. UCLA, Microwave Symposium DigestI.E.E.E.. pp. 753-756 (May 23, 1994).

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