Phase Noise Measurement Method Based on Phase Feature Processing Between Arbitrary Frequency Signals
A phase noise, frequency signal technology, applied in the direction of noise figure or signal-to-noise ratio measurement, etc., can solve the problems of additional errors in synthetic lines, complex equipment, etc., and achieve the effects of low phase noise, wide measurement range, and high measurement accuracy
Inactive Publication Date: 2016-05-11
XIDIAN UNIV
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In this way, not only the equipment is complicated, but also it is easy to introduce additional errors of the synthesis circuit in each transformation link.
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[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0025] exist figure 1 , shows the block diagram of the phase noise measurement scheme based on the phase feature processing between arbitrary frequency signals, and adopts the measurement method of high resolution and wide frequency range. Regarding the problem of fast response time, directly follow the figure 1The method measures the gate time only from 10ms to more than 1 second. In order to obtain a shorter measurement gate, in the case of frequency difference control by DDS, the phase noise and stability in the signal are analyzed by comparing the stability of the count value reaching the trigger limit in the phase coincidence cluster between the signals situation. The composition of the phase coincidence cluster is that when the phase condition between signals (with a special frequency relationship) is less than a certain value, the cluster will ...
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The invention provides a phase noise measurement method based on phase characteristic processing between any frequency signals. According to the measurement method, phase coincident point detection is carried out on a reference signal and detected signals, then coincident points of the phase coincident point detection part are effectively captured, frequency values between the coincident points are measured, meanwhile the positions of pulse loss in a coincident pulse cluster are recorded, and fluctuation changes of counting values in a valve and pulse loss positions can reflect phase noise changes. Phase noise of near carrier frequency can be obtained through analysis of the counting valves in the valve, and the condition of the pulse loss in the phase coincident cluster is analyzed to obtain phase noise of far carrier frequency. At last, single side band phase noise is calculated by means of computer data processing and a discrete Fourier transformation algorithm. The phase noise measurement method has the advantages of being high in measurement precision, wide in measurement range and the like.
Description
technical field [0001] The invention belongs to the field of phase noise measurement, in particular to a phase noise measurement method based on phase feature processing between arbitrary frequency signals. Background technique [0002] Phase noise is an important technical indicator and key technical issue of many modern electronic systems and equipment, including measurement and control, radar, communication, navigation, radio astronomy, electronic measurement and modern physics experiments. Through the research on the characterization and testing of phase noise, Find the factors that affect frequency stability, which can be applied to the design and quality assurance of frequency sources. Frequency source phase noise requirements are often the limiting factor for the overall system. Phase processing and phase noise measurement are of great significance in the characteristics of basic frequency sources, research, application and performance testing of frequency base stand...
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IPC IPC(8): G01R29/26
Inventor 李智奇周渭宣宗强苗苗宋慧敏康旭
Owner XIDIAN UNIV