System for identification and determination of the moment of passage of a multiple number of moving bodies at a given point on their path
First Claim
1. A system for identification and determination of the moment of passage of a multiple number of moving bodies over a given line intersecting their path, comprising in combination:
- a plurality of mobile devices mounted respectively on said moving bodies, each of said mobile devices comprising transmitter means capable of transmitting a respective radio identification signal at a frequency which is representative of said moving body;
a fixed receiving antenna set up on said line and to receive the respective identification signals;
means for processing the identification signals received by the receiving antenna to identify each respective moving body which emitted it and the time each respective body passes by said receiving antenna;
a fixed transmitter located in proximity to said given line for emitting a control signal controlling the transmitters of said mobile devices;
each of said mobile devices further comprisingmeans for receiving said control signal,means for generating said identification signal at said representative frequency,first means connected between said receiving means and said generating means for converting said control signal into a reference signal with respect to which the value of said representative frequency signal is established,second means also connected between said receiving means and said generating means for converting said control signal into a gate signal,power supply means, andgate means responsive to said gate signal for connecting said power supply means to said generating means and said transmitter means for applying power thereto only as long as said control signal is received by said receiver means.
1 Assignment
0 Petitions
Accused Products
Abstract
The system comprises a mobile device mounted (2) on each moving body, a fixed receiving antenna (3) and means for processing (4) the identification signals emitted by the mobile devices (2). The frequency of these identification signals is representative of the respective moving bodies. In addition, a transmitter (22) is provided to send the devices (2) a control signal that serves, on the one hand, to allow power supply to be applied to means for generating the identification signals and, on the other, serves as reference signal for those means, which do not have their own time base. This system is particularly well suited to the timing of automobile races.
-
Citations
18 Claims
-
1. A system for identification and determination of the moment of passage of a multiple number of moving bodies over a given line intersecting their path, comprising in combination:
-
a plurality of mobile devices mounted respectively on said moving bodies, each of said mobile devices comprising transmitter means capable of transmitting a respective radio identification signal at a frequency which is representative of said moving body; a fixed receiving antenna set up on said line and to receive the respective identification signals; means for processing the identification signals received by the receiving antenna to identify each respective moving body which emitted it and the time each respective body passes by said receiving antenna; a fixed transmitter located in proximity to said given line for emitting a control signal controlling the transmitters of said mobile devices; each of said mobile devices further comprising means for receiving said control signal, means for generating said identification signal at said representative frequency, first means connected between said receiving means and said generating means for converting said control signal into a reference signal with respect to which the value of said representative frequency signal is established, second means also connected between said receiving means and said generating means for converting said control signal into a gate signal, power supply means, and gate means responsive to said gate signal for connecting said power supply means to said generating means and said transmitter means for applying power thereto only as long as said control signal is received by said receiver means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A system for identification and determination of the moment of passage of a multiple number of moving bodies over a given line intersecting their path, comprising:
-
a mobile device mounted on each moving body and comprising a transmitter capable of emitting a respective radio identification signal from each respective moving body; a fixed receiving antenna set up on said line and to receive the respective identification signals; means for processing the identification signals received by the receiving antenna to identify each respective moving body which emitted it and the time each respective body passes by the receiving antenna; a fixed transmitter located in proximity to said given line emitting a control signal controlling the transmitters of the mobile devices; and each mobile device comprising a receiver for the control signal, wherein the control signal is emitted in a limited space defined in front of and past and below the given line, and each mobile device further comprising means for operating the transmitter of said each mobile device as long as its receiver receives the control signal, and means for producing the identification signal using the control signal as a reference, said means for operating the transmitter of a mobile device comprising a tone detector tuned to the frequency of the control signal, said means for producing the identification signal being operated only when the tone detector detects the control signal, and said means for operating the transmitter of the mobile device further comprising means for supplying the tone detector only when said control signal is received. - View Dependent Claims (15, 16, 17, 18)
-
Specification