CN-121978640-A - High-precision active receiving link phase jitter measuring method

CN121978640ACN 121978640 ACN121978640 ACN 121978640ACN-121978640-A

Abstract

A high-precision active receiving link phase jitter measuring method comprises the steps of measuring the phase of the same point frequency signal for multiple times by using an active receiving link, counting the measurement result to obtain a phase jitter result, analyzing the signal-to-noise ratio of the active receiving link receiving point frequency signal, calculating the signal phase jitter caused by noise corresponding to the signal-to-noise ratio by using a Kelarmey boundary formula, deducting the phase jitter caused by noise from the counting result of the point frequency signal phase measurement, and realizing the accurate measurement of the phase jitter by the active receiving link.

Inventors

ZHAI JIQUAN
LI PIN
ZHANG MENG
LIU WEI
CHENG QIANG
YANG YUHAO
Xia Linghao

Assignees

中国电子科技集团公司第十四研究所

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (6)

1. A high-precision active receiving link phase jitter measuring method is characterized by comprising the steps of measuring the phase of the same point frequency signal for a plurality of times by using an active receiving link, counting the measurement result to obtain a phase jitter result, analyzing the signal to noise ratio of the active receiving link receiving point frequency signal, calculating the signal phase jitter caused by noise corresponding to the signal to noise ratio by using a Kelarmey boundary formula, subtracting the phase jitter caused by noise from the counting result of the point frequency signal phase measurement, and realizing the accurate measurement of the phase jitter by the active receiving link.
2. The method for measuring phase jitter of high-accuracy active receiving link according to claim 1, wherein said measuring phase of same point frequency signal with active receiving link multiple times comprises measuring phase of same point frequency signal with active receiving link to be measured Is carried out by the phase of (2) Secondary measurement to obtain Secondary phase measurement 。
3. The method for measuring phase jitter of high-accuracy active receiving link according to claim 1, wherein said counting measurement result comprises the steps of Secondary phase measurement Calculating the variance of phase jitter 。
4. The method for measuring phase jitter of high-accuracy active receiving link according to claim 1, wherein said analyzing the signal-to-noise ratio of the received point frequency signal of the active receiving link comprises calculating the signal of the active receiving link to the point frequency signal Proceeding with Signal to noise ratio of secondary measurements According to Secondary signal to noise ratio measurement Calculating the mean value of the signal to noise ratio 。
5. The method for measuring phase jitter of high-accuracy active receiving link according to claim 1, wherein said calculating the noise-induced signal phase jitter corresponding to the signal-to-noise ratio using the Kelarmey-Lung equation comprises The average value of the secondary signal-to-noise ratio is used for calculating the phase jitter caused by noise by using the Kramer boundary formula 。
6. The method for measuring phase jitter of high-accuracy active receiving link according to claim 1, wherein subtracting noise-induced phase jitter from the statistical result of the phase measurement of the point frequency signal comprises using a multivariate error cascade formula Calculating phase jitter results for active receive chains 。

Description

High-precision active receiving link phase jitter measuring method Technical Field The invention belongs to the technical field of phase jitter measurement, and particularly relates to a signal-to-noise ratio separation measurement technology. Background The phase jitter level of the active receiving link is comprehensively influenced by the system clock jitter, the local oscillator signal phase jitter and the phase stability of the active component, and is an important factor influencing the performance of electronic systems such as radars. Whether the phase jitter of the active receiving link can be accurately measured is a precondition and basis for the design and performance evaluation of electronic systems such as radars and the like. The phase jitter of the active receiving link is evaluated, the active receiving link to be tested is generally adopted to measure the phase of the same point frequency signal for multiple times, and the multiple measurement results are statistically analyzed to obtain the phase jitter level. The measuring method is simple and visual, but the accuracy is affected by system noise. The application scenes such as distributed phase-coherent synthesis have higher requirements on the phase jitter measurement precision of the active receiving link, and the influence of noise on the phase jitter measurement of the active receiving link is not negligible. Disclosure of Invention In order to solve the problem that noise affects the accuracy of the phase jitter measurement result of an active receiving link and meet the high requirement of application scenes such as distributed phase-coherent synthesis on the accuracy of the phase jitter measurement of the active receiving link, the invention adopts a high-accuracy active receiving link phase jitter measurement method, analyzes the signal-to-noise ratio of a receiving point frequency signal of the active receiving link on the basis of the phase statistical distribution of a plurality of measurement synchronous point frequency signals, quantitatively calculates the phase jitter of the signal caused by the noise by adopting a Kelarmilar boundary formula, deducts the influence of the phase jitter caused by the noise on the basis of the phase statistical of the point frequency signals, and obtains the accurate measurement result of the phase jitter of the active receiving link, thereby laying a technical foundation for the design and performance evaluation of a radar system applied to the distributed phase-coherent synthesis. The phase of the same point frequency signal is measured for a plurality of times by using the active receiving link, the measurement result is counted to obtain a phase jitter result, the signal to noise ratio of the received point frequency signal of the active receiving link is analyzed, the signal phase jitter caused by noise corresponding to the signal to noise ratio is calculated by using a Kelarmey boundary formula, and the phase jitter caused by the noise is subtracted from the counting result of the phase measurement of the point frequency signal, so that the accurate measurement of the phase jitter by the active receiving link is realized. Further, the active receiving link to be tested is used for frequency point signalIs carried out by the phase of (2)Secondary measurement to obtainSecondary phase measurement。 Further, according toSecondary phase measurementCalculating the variance of phase jitter。 Further, the frequency point signal of the active receiving link pair is calculatedProceeding withSignal to noise ratio of secondary measurements。 Further, according toSecondary signal to noise ratio measurementCalculating the mean value of the signal to noise ratio。 Further, according toThe average value of the secondary signal-to-noise ratio is used for calculating the phase jitter caused by noise by using the Kramer boundary formula。 Further, using a multivariate error cascade formulaCalculating phase jitter results for active receive chains。 The phase jitter of the active link is coupled with the phase jitter caused by noise, and the conventional measurement method cannot distinguish the phase jitter from the phase jitter of the active link, namely, when the conventional instrument directly measures the phase jitter of the active link, the phase jitter caused by noise is included, and the jitter of the active link cannot be accurately measured. The invention provides a high-precision measuring method by utilizing the inherent relation between the phase jitter caused by noise and the signal-to-noise ratio, namely the Kramer, and indirectly measuring the phase jitter caused by noise by measuring the signal-to-noise ratio to separate and measure the phase jitter of the noise and the active link. Drawings Fig. 1 is a process flow diagram. Fig. 2 is a statistical distribution diagram of phase jitter measurement results. Fig. 3 is a statistical distribution diagram of signal-to-noise ratio measurements. Detaile