Patent ID: 9560720
Date: 2017-01-31
CPC Classifications: F21S,F21V,F21W,G01P,G01R,G01S,G08B,G08G,H02J,H04W,H05B,Y02B

Claim:
1. A traffic light control system comprising: at least one traffic signal apparatus; a signal generator, contained within the traffic signal apparatus, that generates a signal within a frequency band of 57-64 GHz; a transmitter, contained within the traffic signal apparatus, that transmits the signal; a receiver, contained within the traffic signal apparatus, that receives a response to the signal; and a computational device, contained within the traffic signal apparatus, communicatively coupled to the receiver that analyzes the response to the signal to determine if a specified condition is present, wherein the specified condition is a sequence of plus and minus ones within reflected portions of the signal and a segment within the signal having a sine wave of many periods is aligned so that transition times of the sequence of plus and minus ones align with zero crossings of the sine wave within the segment.