A Laser Pulse Ranging Method Using Cyclostationary Random Sequence

Abstract

The invention discloses a laser pulse ranging method using a cyclostationary random sequence. First, at the transmitting end, the laser emits a series of pulsed lasers with equal time intervals. Generate the echo laser pulse timing signal after reflection; at the receiving end, map the echo laser pulse timing signal on the sinusoidal reference signal, and construct a cyclostationary random time sequence by transmitting multiple pulses and performing cross-correlation processing; The high-precision distance of the target to be measured is obtained by using the phase estimation characteristic of the sinusoidal signal. The above method can effectively reduce the influence of the timing error on the ranging accuracy in traditional pulsed laser ranging, fully suppress the influence of interference, and improve the ranging accuracy.

Description

technical field [0001] The invention relates to the technical field of laser pulse ranging, in particular to a laser pulse ranging method using a cyclostationary random sequence. Background technique [0002] In recent years, with the development of pulsed semiconductor laser technology, pulsed laser ranging without cooperative targets has been extensively studied. Compared with continuous wave laser, pulsed laser has short duration, concentrated energy and high instantaneous power under the condition of safe laser power (class 1 laser less than 1mw). It has the advantages of strong ability and suitable for the identification of moving targets. The laser pulse echo signal is a noisy signal, and the pulse amplitude is randomly distributed. The change of the latter pulse amplitude will produce a walk-off error, which will lead to a decrease in the distance measurement accuracy. The walk-off error can be compensated by measuring the pulse peak value, rise time or pulse width,...

AI Technical Summary

Problems solved by technology

The noise superimposed on the measurement data limits the timing accuracy. This noise includes white noise and random noise that changes according to a certain period. The former white noise obeys statistical laws and can be reduced by averaging multiple measurements, while the latter periodic random noise is unknown. or time-varying, eventually leading to unreliable measurements

[0003] The existing ranging method is to measure the energy of the pulse signal, and the unknown or time-varying noise superimposed on the pulse is difficult to eliminate

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