| 摘要 |
A traffic monitoring and warning method is provided herein. The method is used for detecting and signalling the presence of a truck in a predetermined zone, and of determining the speed of the truck. The method includes the steps of: (i) receiving, with a first above-road electro-acoustic sensor array, a first acoustic signal which is radiated from a motor vehicle and converting the first acoustic signal into a first electric signal that represents the first acoustic signal; (ii) receiving, with a second above- road electro-acoustic sensor array, a second acoustic signal which is radiated from the motor vehicle and converting the second acoustic signal into a second electric signal that represents the second acoustic signal; (iii) creating, with spatial discrimination circuitry, a third electric signal, which is based on the sum of the first electric signal and the second electric signal such that the third signal is indicative of the acoustic energy emanating from the detection zone; (iv) creating, with interface circuitry, a binary loop relay signal which is based on the third electric signal such that the loop relay signal is asserted when the motor vehicle is within the detection zone and such that the loop relay signal is retracted when the motor vehicle truck is not within the detection zone; and (v) comparing the third electric signal to electrical signals from known trucks to determine whether the motor vehicle is a truck, and to compute the speed of the truck if the motor vehicle is determined to be a truck. |
