Patent ID: 8416641
Filing Date: 2013-04-09
Classification: G01S

Abstract:
1. A method for forming a vehicular distance measurement system including a plurality of modules, each module including an ultrasonic transducer and an ultrasonic distance measurement circuit, comprising: configuring each ultrasonic distance measurement circuit to select a modulation pattern that is a binary sequence, the digital sequence being one of a plurality of binary sequences used by the plurality of modules, wherein each module uses a different one of the plurality of binary sequences; configuring each ultrasonic distance measurement circuit to modulate a carrier wave using phase shift key modulation in a pulse to produce a modulated driving signal, the phase shift key modulation corresponding to the selected digital sequence; configuring each ultrasonic distance measurement circuit to concurrently output the modulated driving signal to the ultrasonic transducer of the module; configuring each ultrasonic distance measurement circuit to receive a signal from the ultrasonic transducer of the module; configuring each ultrasonic distance measurement circuit to concurrently provide the signal received from the ultrasonic transducer of the module to a plurality of modulation pattern specific correlators of the module, wherein each one of the plurality of modulation pattern specific correlators compares the received signal to a different digital sequence of the plurality of digital sequences, wherein each of the different digital sequences correspond to one of the plurality of modules; and configuring each ultrasonic distance measurement circuit to concurrently detect echoes of driving signals concurrently transmitted by the plurality of modules using the plurality of correlators of the module.