Measurement method and realization circuit of short pulse amplitude based on multiple pulse peak hold

Abstract

The invention relates to a short pulse amplitude measurement method based on multiple pulse peak hold and an implementation circuit, which is characterized in that it includes the following content: 1) stretching the pulse width of the measured nanosecond-level narrow pulse; 2) stretching the stretched pulse The amplitude of the signal is amplified; 3) Using multiple broadened and amplified signals to charge the energy storage capacitor multiple times in sequence to perform peak hold to realize energy superposition; 4) Perform amplitude sampling on the waveform after multiple peak hold, Get the amplitude information of nanosecond narrow pulse. Based on the principle of narrow pulse peak hold, the present invention uses a plurality of signals that have been stretched and amplified to charge the energy storage capacitor multiple times to perform peak hold, which is equivalent to amplifying the energy of the measured nanosecond-level narrow pulse, and It also avoids the noise of the echo, solves the problems of insufficient nanosecond pulse broadening and too low signal-to-noise ratio, and can be widely used in the peak hold of nanosecond narrow pulses.

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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