Method and device for assisting terrestrial vehicle traffic

Details Method and device for assisting terrestrial vehicle traffic Method and device for assisting terrestrial vehicle traffic

1990-03-08

1991-12-03

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Combined with primary radar system

342125, G01S 1380

Patent

active

050703340

ABSTRACT:
A method for assisting terrestrial vehicle traffic involves equipping at least some vehicles with a radar system and a transponder capable of re-transmitting with selected frequency transposition any radar wave received within a predetermined frequency band. The radar system semi-continuously transmits the waves capable of measuring a distance over a range of several hundreds of meter, and the radar system receives the transposed echoes in order to carry out distance measurement thereon. It is also possible to provide certain bodies, not equipped with radar, with individual transponders which are different from those provided on vehicles.

REFERENCES:
patent: 2837736 (1958-06-01), Golay
patent: 4015259 (1977-03-01), Siverhus et al.
patent: 4242661 (1980-12-01), Henoch et al.
patent: 4278977 (1981-07-01), Nossen
patent: 4390880 (1983-06-01), Henoch
patent: 4804961 (1989-02-01), Hane
IEEE, "Automatic Vehicle Identification Technology and Applications", pp. 285-291, May 1985.

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