Motor vehicle detection system comprising a module for emitting, and a module for receiving, a light beam

A luminous system for an automotive vehicle, comprising:

• a. an emitting module including a luminous module capable of emitting a light beam whose spectrum has at least a portion in the visible spectrum, and a modulation unit designed to control the luminous module for the performance, on the basis of the emitted light beam, of a flashing photometric function including a sequence of successive cycles each composed of an active phase followed by an inactive phase, the modulation unit being capable of receiving what is referred to as a modulating data sequence, and being designed to modulate the emitted light beam on the basis of the sequence of received data;
• b. a receiving module capable of receiving a light beam, wherein the receiving module includes an elementary acquisition module including a photodetector capable of converting a light signal it receives into an electrical signal;
• and
• a computing unit designed to generate a first modulating data sequence having a first duty cycle and to transmit the first modulating data sequence to the modulation unit in order for a first modulated light beam to be emitted by the luminous module during each active phase;
• in that the computing unit is designed to generate a second modulating data sequence having a second duty cycle lower than the first duty cycle and to transmit the second modulating data sequence to the modulation unit in order for a second modulated light beam to be emitted by the luminous module during each inactive phase;
• and in that the computing unit is designed to determine a time of flight between emission of the first or second emitted modulated light beam and reception of a light beam received by the receiving module on the basis of an electrical signal converted by the photodetector on the basis of the received light beam.