Real-time and high-precision coherent pulse signal frequency measurement method

Abstract

The invention provides a real-time and high-precision coherent pulse signal frequency measurement method, and belongs to the technical field of detection and reconnaissance. Single pulse frequency measurement is performed on a single pulse signal by utilizing a discrete frequency spectrum phase difference correction method firstly, and if frequency measurement precision reaches a certain range, fine correction is performed step by step by fully utilizing multiple pieces of coherent pulse information so that frequency measurement precision is enhanced; and if frequency does not reach the preset range, single pulse frequency measurement is performed on multiple single pulses respectively, frequency measurement results are accumulated and averaged and frequency is enabled to reach the preset range, and then fine correction is performed step by step by utilizing multiple pieces of coherent pulse information. Compared with existing methods, the method has advantages of high frequency measurement precision, high anti-noise capability, moderate computation amount and multi-carrier frequency signal frequency measurement capability.

Description

technical field [0001] The invention relates to a real-time high-precision coherent pulse signal frequency measurement method, which belongs to the technical fields of detection and reconnaissance. Background technique [0002] In the fields of detection, reconnaissance, positioning, and electronic countermeasures, the use of instantaneous frequency measurement technology to measure the frequency of the pulse signal of the received radiation source in real time and with high precision plays an important role in the detection, tracking, sorting, identification, and positioning of radiation sources. Frequency measurement methods mainly include analog frequency measurement and digital frequency measurement. Among them, digital frequency measurement has the advantages of flexible processing, good frequency measurement stability, and high precision, which is the future development trend. [0003] At present, there are many digital frequency measurement algorithms, such as direct...

AI Technical Summary

Problems solved by technology

Each of these frequency measurement algorithms has some shortcomings, and it is difficult to take into account anti-noise, low calculation amount, multi-carrier frequency signal frequency measurement, etc.

For example, although the direct counting method is simple to implement and has a small amount of calculation, its anti-noise performance is poor, and it is not suitable for frequency measurement of multi-carrier frequency signals; the phase estimation method and frequency estimation method require more hardware resources, and cannot simultaneously measure multi-carrier signal frequency

The Fourier transform method has strong anti-noise ability, and has the ability to measure the frequency of multi-carrier frequency signals. It is an algorithm widely used in digital frequency measurement, but the frequency measurement accuracy of the Fourier transform method is only 1 / 2 of the frequency resolution of the discrete spectrum. , the frequency measurement accuracy is limited, and when the number of sampling points is large, a large amount of computing resources are required

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