Photonics-assisted microwave frequency measurement method and device based on precision compensation

Abstract

The invention discloses a precision compensation photonics-assisted frequency measurement device based on interference and power cancellation scanning. The device comprises a laser source, a polarization multiplexing double-parallel Mach-Zehnder modulator, an arbitrary waveform generator, an erbium-doped fiber amplifier, a polarization controller, a polarization beam splitter, a Mach-Zehnder interferometer, a photoelectric detector, an optical power meter, an electric power meter and a processing unit. The invention also provides a two-step measurement precision compensation photonics-assisted frequency measurement method. The method comprises the following steps of: firstly, quickly estimating a frequency band of an unknown radio frequency signal; and secondly, scanning and measuring in the estimated frequency band to obtain a precise frequency measurement result. According to the invention, high-precision and high-response-speed frequency measurement can be carried out by covering a large frequency monitoring range. In addition, high-resolution multi-frequency measurement can be further achieved, and the method is suitable for an integrated cognitive detection system in a complex electromagnetic environment.

Description

technical field [0001] The invention relates to the field of microwave photon frequency measurement, in particular to a precision compensation photonics-assisted microwave frequency measurement method and device based on interference and power cancellation scanning. Background technique [0002] Frequency measurement of intercepted microwave signals is an important task of modern radar warning and electronic countermeasure systems, which is usually completed by specially designed receivers. Radar warning needs to monitor threat signals in a wide spectrum range in electromagnetic space and provide real-time early warning. Radar warnings are typically provided with wide range, fast and moderately accurate measurements by instantaneous frequency measurement receivers. Electronic countermeasures require interference or anti-interference to specific frequencies, which puts forward higher requirements for measurement accuracy. Electronic countermeasures are usually performed by ...

AI Technical Summary

Problems solved by technology

But due to the sweeping nature, the measurement response of the above method is slow, and some short-term frequency components may be missed

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