High-precision digital instantaneous frequency measurement method and device

Abstract

The invention discloses a high-precision digital instantaneous frequency measurement method and device. The method comprises the steps that frequency conversion and filtering of radio-frequency signals are carried out at the radio-frequency receiving front end, and X-waveband signals are converted to be medium-frequency signals; AD conversion is carried out on the medium-frequency signals, down-conversion is carried out on the converted medium-frequency signals through a digital signal processing device, and then medium-frequency digital signals are obtained; the medium-frequency digital signals are converted to be base-band digital signals; a dual-signal estimation method based on an FFT and signal square is adopted, the base-band digital signals are computed through an FPGA, and a frequency measurement result is obtained. The high-precision digital instantaneous frequency measurement method and device solve the problem that the frequency measurement precision of the X-waveband pulse signals is not high in the prior art. The dual-signal estimation method based on the FFT and signal square is adopted, after the relative rapidness of the FFT frequency measurement algorithm and the one-dimensional square signal spectrum peak search are combined, the accuracy of frequency intervals is estimated through interpolation, and as the FPGA hardware is utilized for achieving related algorithm, the rapidness and accuracy of frequency measurement are ensured.

Description

technical field [0001] The invention relates to the field of G01R2300 frequency measurement and testing, in particular to a high-precision digital instantaneous frequency measurement method and device. Background technique [0002] In the 1950s and 1960s, instantaneous frequency measurement technology was produced, mainly divided into two types: analog instantaneous frequency measurement and digital instantaneous frequency measurement. Among them, the analog instantaneous frequency measurement equipment is simple and easy to implement, but the frequency measurement accuracy is not high, and the stability is poor. Digital instantaneous frequency measurement has the characteristics of stability, high precision and good real-time performance. [0003] Digital instantaneous frequency measurement is to use digital signal processing method to measure the carrier frequency of the signal. It is required that the digital frequency measurement must be able to perform high-speed and h...

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Problems solved by technology

[0008] Aiming at the problem that the frequency measurement accuracy of the X-band pulse signal is not high in the related art, the prese

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