Range and speed measuring equipment with noise frequency modulated transmitter

摘要

Range and speed measuring equipment is disclosed including a laser transmitter for transmitting laser pulses of a noise modulated carrier frequency toward a target. Return pulses are received by a receiver including a photodetector for mixing the return pulses with a reference signal. The photodetector output signal is supplied to a frequency discriminator or a frequency counter whose output is averaged to indicate range. Noise modulators entirely external to and partially incorporated within the laser oscillator are shown. Means are shown both for deriving the reference signal from the transmitted pulses and for producing the reference signal with a reference oscillator.