Vehicle communication system using existing roadway loops
First Claim
1. A communication system for enabling transfer of information between a vehicle and a stationary information location having a vehicle detector loop antenna, said loop antenna comprising part of a circuit containing conventional vehicle detector signals normally lying within a given frequency range, said system comprising:
- vehicle mounted transmitter means for enabling transmission of a preselected information signal over a relatively small distance range to said stationary information location for sensing by said vehicle detector loop antenna;
vehicle mounted receiver means for receiving another information signal transmitted from said stationary information location via said vehicle detector loop antenna, said receiver means including means for distinguishing said another information signal from the conventional vehicle detector signals present in said vehicle detector loop antenna which lie within said given frequency range, said another information signal being transmitted in a transmitting frequency range different from said given frequency range of said conventional vehicle detector signals; and
vehicle mounted antenna means selectively coupled to said transmitter means and said receiver means for inductive interaction with said vehicle detector loop antenna.
3 Assignments
0 Petitions
Accused Products
Abstract
A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a moving vehicle or as the transmitting antenna for signals generated by a transmitter located at the vehicle detector site for transfer to a receiver mounted on a moving vehicle. The information is encoded on a carrier having a frequency outside the normal frequency range of the vehicle detector system, preferably by interrupted carrier pattern processing.
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Citations
14 Claims
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1. A communication system for enabling transfer of information between a vehicle and a stationary information location having a vehicle detector loop antenna, said loop antenna comprising part of a circuit containing conventional vehicle detector signals normally lying within a given frequency range, said system comprising:
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vehicle mounted transmitter means for enabling transmission of a preselected information signal over a relatively small distance range to said stationary information location for sensing by said vehicle detector loop antenna; vehicle mounted receiver means for receiving another information signal transmitted from said stationary information location via said vehicle detector loop antenna, said receiver means including means for distinguishing said another information signal from the conventional vehicle detector signals present in said vehicle detector loop antenna which lie within said given frequency range, said another information signal being transmitted in a transmitting frequency range different from said given frequency range of said conventional vehicle detector signals; and vehicle mounted antenna means selectively coupled to said transmitter means and said receiver means for inductive interaction with said vehicle detector loop antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication system for enabling transfer of information between a vehicle having an antenna and a stationary information location having a vehicle detector system, said vehicle detector system including a vehicle detector system loop antenna, said loop antenna comprising part of a circuit containing conventional vehicle detector signals normally lying within a given frequency range, said communication system comprising:
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stationary transmitter means for enabling transmission of a preselected information signal over a relatively small distance range to said vehicle for sensing by the vehicle antenna, said stationary transmitter means providing transmission of said preselected information signal in a transmitting frequency range different from the frequency range of the conventional vehicle detector system signals; and stationary receiver means for receiving another information signal transmitted from the vehicle via said vehicle antenna; said vehicle detector system loop antenna being selectively coupled to said stationary transmitter means and said receiver means for inductive interaction with the vehicle antenna, said stationary receiver means including means for distinguishing said another information signal from the conventional vehicle detector signals present in said vehicle detector system loop antenna. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification