RF system group delay parameter measuring device

Abstract

The invention discloses an RF system group delay parameter measuring device which comprises a pulse signal generator (1), a modulator (2), a first RF source (3), a square law detector (5), a second RF source (6), a power divider (7), a first analog-digital converter (8), a second analog-digital converter (9) and a postprocessing module (10); a single-pole double-throw switch (4) comprises a first fixed terminal (401), a second fixed terminal (402) and a moving contact (403). The measuring device utilizes the square law detector to demodulate a modulated signal, so as to avoid introducing errors, and improve the measurement accuracy which is better than 1 ns. The measuring device utilizes the pulse signal generator to generate a code pattern and code rate controllable pulse signal, so as to enable the apertures and time for measurement of the group delay parameters to be adjustable. The measuring device utilizes the single-pole double-throw switch to realize the switching of a signal channel at the output terminal of the modulator, so that the measuring process is simplified. The applicable frequency range of the measuring device is 100 MHz-50 GHz.

Description

technical field [0001] The invention relates to the technical field of measuring radio frequency system group time delay parameters, in particular to a measuring device for radio frequency system group time delay parameters. Background technique [0002] Group delay is a physical quantity used to describe the phase-frequency characteristics of a signal transmission system, and is one of the important performance indicators of a transmission system. Due to the limitation of the physical characteristics of the radio frequency system itself, there is inevitably phase dispersion in the radio frequency system, and the phase dispersion causes changes in group delay parameters at different frequency points, thus affecting signals transmitted in the radio frequency system. Therefore, it is of great significance to accurately measure the group delay parameters of the radio frequency system at different frequency points to determine the performance index of the entire radio frequency ...

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Problems solved by technology

Among them, the sinusoidal modulation phase detection method obtains the time delay between the modulation information and the original information through phase detection, so the sinusoidal modulation phase detection method is susceptible to the influence of multipath reflection in the radio frequency system to be tested, and its measurement accuracy is low; pulse modulation peak value comparison The method determines the delay by peak detection first, and then compares the peak value of the modulated pulse. Therefore, there is a contradiction between the measurement accuracy of the pulse modulation peak comparison method and the measurement aperture, and it is difficult to accurately reflect the curve fluctuation of the group delay parameter of the RF system to be measured. ; The structure of the measuring device used by the BPSK receiver method is complex, cannot be calibrated, and it is difficult to improve the measurement accuracy through post-processing

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