System and method for detecting obstacles within the area of a railroad grade crossing using a phase modulated microwave signal
First Claim
1. A system for automatically detecting the presence of an obstacle located within a surveillance area associated with a railroad grade crossing, said system comprising:
- a transmitter transmitting a signal through the surveillance area;
a modulating reflector receiving the transmitted signal, said reflector comprising a phase modulator receiving the received signal and generating a phase modulated signal having a characteristic introduced by the modulating reflector, said modulating reflector transmitting the phase modulated signal through the surveillance area;
a receiver located to receive the phase modulated signal; and
a processor coupled to the transmitter and to the receiver, said processor configured to process the received phase modulated signal and configured to initiate an action as a function of the characteristic in the received phase modulated signal.
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Accused Products
Abstract
A system and method for automatically detecting the presence of an obstacle located within a surveillance area associated with a railroad grade crossing. The system includes a transmitter transmitting a signal through the surveillance area and a modulating reflector receiving the transmitted signal. The modulating reflector includes a phase modulator receiving the received signal and generating a phase modulated signal having a characteristic. The modulating reflector transmits the phase modulated signal through the surveillance area that is received by a receiver located to receive the phase modulated signal. The system further includes a processor coupled to the transmitter and to the receiver, the processor being configured to process the received phase modulated signal and to initiate an action as a function of the characteristic in the received phase modulated signal.
18 Citations
28 Claims
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1. A system for automatically detecting the presence of an obstacle located within a surveillance area associated with a railroad grade crossing, said system comprising:
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a transmitter transmitting a signal through the surveillance area;
a modulating reflector receiving the transmitted signal, said reflector comprising a phase modulator receiving the received signal and generating a phase modulated signal having a characteristic introduced by the modulating reflector, said modulating reflector transmitting the phase modulated signal through the surveillance area;
a receiver located to receive the phase modulated signal; and
a processor coupled to the transmitter and to the receiver, said processor configured to process the received phase modulated signal and configured to initiate an action as a function of the characteristic in the received phase modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for automatically detecting the presence of an obstacle located within a surveillance area associated with a railroad grade crossing;
- comprising;
transmitting a microwave signal through the surveillance area;
receiving the microwave signal at a modulating reflector;
phase modulating the received microwave signal by a phase modulator creating a phase modulated signal containing a characteristic;
transmitting the phase modulated signal through the surveillance area;
receiving the phase modulated signal at a receiver;
processing the phase modulated signal to determine the characteristic within the received phase modulated signal; and
initiating an action as a function of the determined characteristic of the received phase modulated signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- comprising;
Specification