Time discriminating circuit system

Abstract

The invention discloses a time discriminating circuit system, which comprises a pulse receiving unit, a high-pass capacitive-resistance unit, a signal amplification unit, a main comparator unit and alevel conversion unit which are electrically connected in sequence, wherein the pulse receiving unit is used for receiving a laser echo pulse signal of a ranging laser pulse and converting the laser echo pulse signal into a unipolar pulse signal; the high-pass capacitive-resistance unit is used for converting the unipolar pulse signal into a bipolar signal; an extreme point of the unipolar pulse signal is converted into a zero point of the bipolar signal and is used as a timing point; the signal amplification unit is used for amplifying the bipolar signal; the main comparator unit is used forcapturing a time jump point based on the amplified bipolar signal and generating a main output signal; and the level conversion unit is used for generating and outputting a time pulse for triggering timing stop time of laser ranging based on the main output signal generated by the main comparator unit.

Description

technical field [0001] The invention relates to the technical field of laser measurement, in particular to a time identification circuit system, which can be used in specific fields such as laser radar, laser fuze, and laser guidance. Background technique [0002] Pulsed laser ranging technology uses laser pulse beams to perform non-contact measurement of long-distance targets, and obtains distance information by measuring the time of flight (TOF) of laser pulses. Its general working process is: the time when the laser generates the initial pulse is determined as the initial moment of the flight time (denoted as T start ); the end pulse generated by the laser is detected by the avalanche photodiode and converted into a photoelectric signal. The trailing edge of the flat signal is determined as the end moment of the flight time (denoted as T stop ), and then calculate T stop with T start The difference between (T stop -T start ), the difference is taken as the flight ti...

AI Technical Summary

Problems solved by technology

The constant ratio timing time identification method divides the echo signal into two channels for delay and attenuation respectively, and enters the positive and negative poles of the high-speed comparator to capture the signal jump, which can reduce the time identification error caused by the amplitude change of the laser pulse signal; but among them Before the delay signal arrives, the attenuation signal is equal to the delay signal amplitude, which will easily cause the output of the high-speed comparator to be unstable or even oscillate; and this method usually needs to add a bias circuit to ensure that the two signals are not equal to each other before the comparison time , which also increases the complexity of the circuit

The constant-ratio constant-ratio time discrimination method is suitable for pulse signals with the same rise time but different amplitudes, and there will be certain errors for pulse signals with different amplitudes and different rise times

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