Ultra-wideband high-precision instantaneous frequency measurement circuit and frequency measurement method

By combining a four-channel parallel frequency measurement architecture with a direct digital frequency synthesizer, the problems of narrow frequency bandwidth, low accuracy, slow speed and complex circuits in existing frequency measurement technologies are solved, realizing ultra-wideband high-precision instantaneous frequency measurement, which is suitable for modern electronic warfare and communication systems.

CN122330504APending Publication Date: 2026-07-03CHENGDU SHIYUAN FREQUENCY CONTROL TECH
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Patent Information

Application Number
CN202610813392.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-08
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing frequency measurement technologies have shortcomings in terms of narrow frequency bandwidth, low frequency accuracy, slow frequency measurement speed, and complex and costly frequency measurement circuits, making it difficult to meet the needs of modern electronic warfare and communication systems for fast, accurate, and wide-bandwidth frequency measurement.

Method used

A four-channel parallel frequency measurement architecture is adopted, which utilizes a power divider group, multiple frequency measurement channels, an analog switch group, a direct digital frequency synthesizer, and an FPGA. Through parallel processing, the ultra-wide frequency range is divided into four sub-bands. The parallel frequency measurement channels, combined with the direct digital frequency synthesizer and FPGA, realize high-precision frequency measurement, simplify the circuit structure, and eliminate spurious signal interference from the frequency divider.

Benefits of technology

It achieves ultra-wideband frequency coverage, rapid frequency determination, simplified circuit structure, and reduced hardware costs, enabling frequency measurement to be completed in microseconds, meeting the needs of modern electronic warfare and communication systems for high-speed and high-precision frequency measurement.

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Abstract

The invention discloses an ultra-wideband high-precision instantaneous frequency measurement circuit and a frequency measurement method, and belongs to the technical field of frequency measurement, and the ultra-wideband high-precision instantaneous frequency measurement circuit comprises a power divider group, a plurality of frequency measurement channels, an analog switch group, an SP3T switch, a direct digital frequency synthesizer and an FPGA. An input radio frequency signal is divided into four paths through the power divider set, the four paths correspond to four frequency measurement channels respectively, each frequency measurement channel corresponds to a different frequency measurement frequency range, and the frequency measurement channels work in parallel. Each channel signal outputs an LVTTL level to the FPGA after passing through the detector and the comparator, and the FPGA judges the frequency range according to the level combination and controls the analog switch and the SP3T to gate the corresponding channel. After the signal frequency generated by the DDS is measured by the FPGA, the input radio frequency signal frequency is obtained through inverse calculation according to the frequency dividing ratio and the frequency control word. According to the invention, DC-20GHz ultra-wideband frequency measurement is realized, the frequency measurement speed depends on the DDS frequency switching speed, the frequency divider power supply is turned off after the frequency measurement is completed so as to eliminate spurious interference, the circuit structure is simple, and the cost is low.
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