Method for generating high-precision stepping delay capable of dynamic calibration

Abstract

The invention discloses a method for generating high-precision stepping delay capable of dynamic calibration, relating to an electronic technique. The method is realized based on a programmable delay chip, a high stability crystal oscillator and a field programmable gate array (FPGA) technology. In the method, a digital phase-lock technique is utilized to compare the delay value of the programmable delay chip with a high stability reference time base signal, so that the calibration for the delay value of the programmable delay chip can be realized. Because the stepping delay of the programmable delay chip and the total delay range are restricted mutually, the high stability crystal oscillator is combined with the programmable delay chip, thus realizing delay output with a wide range, small a stepping quantity and high precision. The method is used to provide launching and sampling timing sequences for equivalent sampling in radar signal acquisition, and has the advantages of wide usable range and high test precision.

Description

technical field [0001] The invention relates to the field of electronic technology, and is a dynamically calibrated high-precision step delay generation method, which can be used for high-speed equivalent sampling in radar signal detection, provides transmitter launch trigger and receiver receiving sampling timing signals, and improves the radar signal. measurement accuracy. Background technique [0002] Time-domain system signal sampling is divided into two mature methods: real-time sampling and equivalent sampling. Real-time sampling requires a digital-to-analog converter (ADC) whose digital-to-analog conversion time is less than the sampling period, which is limited by the speed bottleneck of the current ADC technology. In frequency radar signal detection, the real-time sampling mode is rarely used, but the sequential equal-length step equivalent sampling mode (hereinafter referred to as equivalent sampling) is often used. Equivalent sampling utilizes the periodicity or ...

AI Technical Summary

Problems solved by technology

The accuracy of the step delay directly affects the accuracy of the equivalent sampling, thus affecting the positioning and imaging accuracy of the radar working in the equivalent sampling mode

At present, there are many metho

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