| 主权项 |
1. A sonar positioning system, comprising:
a first vehicle, a sonar device mounted on the first vehicle, the sonar device including a transmitter and a receiver, the receiver having an output; a second vehicle, the second vehicle forwardly displaced from the first vehicle by an actual distance; a light indicator, at least two light outputs disposed on the light indicator; a controller, an input of the controller coupled to the output of the receiver of the sonar device, the controller having first and second settings, a first setting corresponding to a first signal strength relating to a near distance between the first and second vehicles and a second setting corresponding to a second signal strength relating to a far distance between the first and second vehicles; wherein the sonar device projects a signal onto the second vehicle and receives a reflected signal, the reflected signal having a strength and being a function of the actual distance between the first and second vehicles, the strength of the reflected signal being communicated from the receiver of the sonar device to the controller, the controller comparing the strength of the reflected signal to the first and second signal settings, the controller coupled to the light indicator and actuating one or more of the light outputs when the reflected signal strength is greater or equal to the first signal strength and less than or equal to the second signal strength. |
