Radio frequency time delay rapid measurement device based on chirp signal quadrature demodulation

Abstract

The invention discloses a radio frequency time delay rapid measurement device based on chirp signal quadrature demodulation. The device comprises a chirp signal generator, a to-be-measured device, ananalog-to-digital converter, a processor and a memory; the chirp signal generator adopted by the device emits chirp signals with adjustable frequency ranges and adjustable chirp rates, so the rapid measurement of time delay in different frequency ranges is achieved, and the measurement range of the system is large; meanwhile, the time delay of the frequency converter is measured, and extra reference signals are not needed; the system structure is simple, and the anti-jamming capability is high; moreover, the method achieves the extraction of the time delay through the quadrature demodulation technology, avoids the phenomena of phase ambiguity and spectrum leakage in a conventional time delay detection process, and greatly improves the time delay detection precision.

Description

technical field [0001] The invention belongs to the technical field of radio frequency delay measurement, and in particular relates to a rapid radio frequency delay measurement device based on chirp signal quadrature demodulation. Background technique [0002] For any communication system, when a signal passes through a transmission network, the output signal inevitably produces certain distortion, including signal amplitude distortion and phase distortion, and the phase distortion directly determines the delay characteristics of the transmission network. In the 1930s, H. Nyquist and S. Brand of the United States published a paper on delay measurement in the "BSTJ" magazine. The article discussed the physical meaning and measurement method of group delay. [0003] With the rapid development of modern communications, people have more and more stringent requirements on the accuracy of time delay measurement. In the aerospace field, the time delay characteristics have a direct ...

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Problems solved by technology

In the traditional method, the test system is too complex due to the need for reference signals, and the measurement accuracy is not high due to phase ambiguity and spectrum leakage.

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