Short pulse amplitude measurement method based on multiple times of pulse peak keeping, and implementation circuit

Abstract

The invention relates to a short pulse amplitude measurement method based on multiple times of pulse peak keeping, and an implementation circuit. The method comprises the following steps: 1) performing pulse width expansion on a measured nanosecond level narrow pulse; 2) performing amplitude amplification on the expanded pulse signal; and 3) charging an energy storage capacitor for multiple times by using a waveform after the multiple times of pulse peak keeping to obtain the amplitude information of the nanosecond level narrow pulse. According to the short pulse amplitude measurement method, the energy storage capacitor is charged for multiple times by using multiple expanded and amplified signals, the pulse peak keeping is performed, which is equivalent to amplifying the energy of the measured nanosecond level narrow pulse, the noise of echo can also be avoided, the problems of insufficient nanosecond level narrow expansion and low signal to noise ratio are solved, and the short pulse amplitude measurement method can be widely used in the nanosecond narrow pulse peak keep.

Description

technical field [0001] The invention relates to a short pulse amplitude measurement method based on multiple pulse peak hold and a realization circuit, and relates to the technical field of laser ranging. Background technique [0002] The pulse laser ranging system based on the time-of-flight method or the laser pulse of the three-dimensional laser radar system is usually only a few nanoseconds. Obtaining the intensity information of the echo pulse is a necessary prerequisite for controlling the gain amplification and obtaining the gray level information of the target. [0003] The method disclosed in the prior art to directly obtain the peak intensity of nanosecond-level short pulses is to use a high-speed analog-to-digital converter (AD) with a bandwidth of GHz to sample the echo pulses. However, GHz-level high-speed analog-to-digital converter chips are expensive and corresponding The design of the digital processing circuit is complex. Another indirect method disclosed ...

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Problems solved by technology

[0003] The method disclosed in the prior art to directly obtain the peak intensity of nanosecond-level short pulses is to use a high-speed analog-to-digital converter (AD) with a bandwidth of GHz to sample the echo pulses. However, GHz-level high-speed analog-to-digital converter chips are expensive and corresponding The digital processing circuit design of the complex

Another indirect method disclosed in the prior art is to use a peak hold circuit to keep the peak voltage of the short pulse signal as a DC voltage. During the peak voltage hold period, a low-speed analog-to-digital converter is used to sample the constant level. However, due to Nanosecond-level narrow pulses carry less energy, and generally cannot effectively charge the energy storage capacitor in the peak hold circuit

Amplifying short nanosecond pulses can increase the energy carried by the pulses, but the requirements for the gain-bandwidth product of the amplification link are relatively high, and additional noise will be introduced, which will cause the instability of the post-stage peak hold circuit

Therefore, the traditional peak-and-hold circuit is not suitable for short nanosecond pulses

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