A night vision system for a vehicle includes a pulsed light source for illuminating
a region proximate the vehicle and a secondary trigger light source operating at
a predetermined pulse timing and second wavelength. A light sensor detects light
at the second wavelength. The trigger light pulses are used to indicate the pulse
timing of each respective vehicle's primary NIR light source. Upon detecting another
vehicle's trigger light source, the controller adjusts the pulse phase of the first
light source to be exactly out-of-phase with that of the oncoming vehicle since
the pulsed timing of the oncoming vehicle's NIR light source is known upon detection
of the opposing vehicle's trigger light source. Each vehicle can then adjust its
primary light source to be out-of-phase with the other vehicle and, hence, non-interfering.