Transponder systems for automatic identification purposes

Details Transponder systems for automatic identification purposes Transponder systems for automatic identification purposes

1994-07-18

1995-09-26

Hellner, Mark

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

Radar transponder system

342 51, G01S 1374

Patent

active

054537479

ABSTRACT:
A method of communicating between an interrogator (10) and at least a first and second transponder (12). The transponders (12)are separately located within a first and a second vehicle (20) travelling within a first and a second traffic lane, respectively. The method has the steps of providing a first and a second LF antenna (16) associated with and proximity to a first and a second traffic lane, respectively. From each of the first and second LF antennas (16) a continuous LF subcarrier is transmitted to serve as a clock signal for each antenna's associated transponder (12). Initially, a wake-up signal is sent by each of the LF antennas (16) to its associated transponder (12). Following the wake-up signal, a unique lane code is sent by each of the LF antennas (16) to its associated transponder (12). The transponder (12) stores its unique lane code in its memory (70). The transponder then sends a UHF response in a pre-determined time period depending on the unique lane code stored in each of the transponders (12). The time period in which the transponder (12) sends its UHF response is unique to that transponder (12) so that interference between responding transponders (12) is avoided. Other devices, systems and methods are also disclosed.

REFERENCES:
patent: 4075632 (1978-02-01), Baldwin et al.
patent: 4926182 (1990-05-01), Ohta et al.
patent: 5128669 (1992-07-01), Dadds et al.

Affiliated with

Also associated with

Rating

Transponder systems for automatic identification purposes does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transponder systems for automatic identification purposes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transponder systems for automatic identification purposes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1554230