Laser transponder

A laser transponder for disabling a laser-based speed monitor which is transmitting a monitor laser beam at a moving vehicle by transmitting a jamming laser beam to the laser-based speed monitor, whereby the monitor laser beam is in the shape of a monitor signal that includes monitor pulse trains emitted with a first frequency, and the jamming laser beam is in the shape of a jamming signal that includes jamming pulse trains emitted with a second frequency and an optical transmitter for transmitting the jamming signal to the laser-based speed monitor in phase with the monitor signal.

A laser transponder for disabling a laser-based speed monitor which is transmitting a monitor laser beam at a moving vehicle by transmitting a jamming laser beam to the laser-based speed monitor, whereby the monitor laser beam is in the shape of a monitor signal that includes monitor pulse trains emitted with a first frequency, and the jamming laser beam is in the shape of a jamming signal that includes jamming pulse trains emitted with a second frequency,

• a microprocessor with a program adapted for registering time elapsed between receiving successive monitor pulse trains and
• calculating, based on the registered times, a time for receiving the next monitor pulse train.

A method for disabling a laser-based speed monitor which is transmitting a monitor laser beam in the shape of a monitor signal having a first frequency, which comprises having the laser-based speed monitor transmit a jamming laser beam in the shape of a jamming signal having a second frequency.