High-precision active receiving link phase jitter measurement method

Abstract

The invention discloses a high-precision active receiving link phase jitter measurement method, which comprises the following steps of: measuring the phase of the same point frequency signal for multiple times by using an active receiving link, counting a measurement result, obtaining a phase jitter result, analyzing the signal-to-noise ratio of the point frequency signal received by the active receiving link, and calculating the signal phase jitter caused by noise corresponding to the signal-to-noise ratio by using a Cramer-Rao bound formula. And deducting phase jitter caused by noise from a statistical result of dot frequency signal phase measurement to realize accurate measurement of the phase jitter by the active receiving link.

Description

Technical Field

[0001] This invention belongs to the field of phase jitter measurement technology, specifically relating to a measurement technique using signal-to-noise ratio separation. Background Technology

[0002] The phase jitter level of an active receiver link is affected by a combination of system clock jitter, local oscillator signal phase jitter, and the phase stability of active components, making it a crucial factor influencing the performance of electronic systems such as radar. Accurate measurement of the phase jitter of an active receiver link is a prerequisite and foundation for the design and performance evaluation of electronic systems such as radar.

[0003] To assess phase jitter in an active receiver link, the phase of the same point-frequency signal is typically measured multiple times using the active receiver link under test. The results of these measurements are then statistically analyzed to obtain the phase jitter level. This method is simple and intuitive, but its accuracy is affected by system noise. Applications such as distributed coherent synthesis require high precision in phase jitter measurement of active receiver links, and the impact of noise on phase jitter measurement in active receiver links cannot be ignored. Summary of the Invention

[0004] To address the issue of noise affecting the accuracy of active receiver link phase jitter measurement results and to meet the high accuracy requirements of active receiver link phase jitter measurement in applications such as distributed coherent synthesis, this invention employs a high-precision active receiver link phase jitter measurement method. Based on multiple measurements of the phase statistical distribution of the synchronization point frequency signal, the signal-to-noise ratio of the received point frequency signal in the active receiver link is analyzed. The Cramer-Rao bound formula is used to quantitatively calculate the phase jitter of the signal caused by noise. Based on the phase statistics of the point frequency signal, the influence of phase jitter caused by noise is subtracted to obtain accurate measurement results of the active receiver link phase jitter. This lays a technical foundation for the design and performance evaluation of radar systems applied to distributed coherent synthesis.

[0005] The phase of the same point-frequency signal is measured multiple times using an active receiving link. The measurement results are statistically analyzed to obtain the phase jitter result. The signal-to-noise ratio of the point-frequency signal received by the active receiving link is analyzed. The signal phase jitter caused by noise corresponding to the signal-to-noise ratio is calculated using the Cramer-Rao bound formula. The phase jitter caused by noise is subtracted from the statistical results of the point-frequency signal phase measurement, thus realizing the accurate measurement of phase jitter by the active receiving link.

[0006] Furthermore, the frequency signal is compared using the active receiving link under test. Phase The measurement yielded... Subphase measurement results .

[0007] Furthermore, according to Subphase measurement results Calculate the variance of phase jitter .

[0008] Furthermore, the active receiver link is calculated to match the frequency signal. conduct Signal-to-noise ratio of the second measurement .

[0009] Furthermore, according to Measurement results of secondary signal-to-noise ratio Calculate the mean signal-to-noise ratio. .

[0010] Furthermore, according to The measured mean of the signal-to-noise ratio is used to calculate the noise-induced phase jitter using the Cramer-Rao bound formula. .

[0011] Furthermore, using the multivariate error cascade formula Calculate the phase jitter results of the active receiver link .

[0012] Phase jitter in an active link is coupled with phase jitter caused by noise. Traditional measurement methods cannot distinguish between the two. That is, when traditional instruments directly measure the phase jitter of an active link, they include the phase jitter caused by noise and cannot accurately measure the jitter of the active link itself.

[0013] This invention utilizes the inherent relationship between noise-induced phase jitter and signal-to-noise ratio (SNR), namely the Cramer-Rao boundary, to indirectly measure noise-induced phase jitter by measuring the SNR. This separates the measurement of noise and active link phase jitter, providing a high-precision measurement method. Attached Figure Description

[0014] Figure 1 It is a process flowchart.

[0015] Figure 2 This is a statistical distribution chart of phase jitter measurement results.

[0016] Figure 3 This is a statistical distribution chart of the signal-to-noise ratio measurement results. Detailed Implementation

[0017] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] The processing flow of this invention is as follows: Figure 1 As shown, the signal is processed using the active receiver link under test. The phase was measured 10,000 times to obtain the phase measurement results. ,like Figure 2 As shown, sampling rate Sampling length , , , This represents a Gaussian variable with a mean of 0° and a standard deviation of 15°. This represents a Gaussian process with a mean of 0 and a standard deviation of 1.

[0019] Based on the results of 10,000 phase measurements Calculate the variance of phase jitter Calculate the active receiver link pair of signals Signal-to-noise ratio after 10,000 measurements ,like Figure 3 As shown.

[0020] Based on 10,000 signal-to-noise ratio measurements Calculate the mean signal-to-noise ratio The phase jitter caused by noise is calculated using the Cramer-Rao boundary formula. .

[0021] Using the multivariable error cascade formula Calculate the phase jitter results of the active receiver link .

[0022] The above are embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A high-precision active receiver link phase jitter measurement method, characterized in that, include: The phase of the same point-frequency signal is measured multiple times using an active receiving link. The measurement results are statistically analyzed to obtain the phase jitter result. The signal-to-noise ratio of the point-frequency signal received by the active receiving link is analyzed. The signal phase jitter caused by noise corresponding to the signal-to-noise ratio is calculated using the Cramer-Rao bound formula. The phase jitter caused by noise is subtracted from the statistical results of the point-frequency signal phase measurement, thus realizing the accurate measurement of phase jitter by the active receiving link.

2. The high-precision active receiver link phase jitter measurement method according to claim 1, characterized in that, The method of repeatedly measuring the phase of the same frequency signal using an active receiving link includes: using the active receiving link under test to measure the phase of the frequency signal. Phase The measurement yielded... Subphase measurement results .

3. The high-precision active receiver link phase jitter measurement method according to claim 1, characterized in that, The statistical measurement results include: based on Subphase measurement results Calculate the variance of phase jitter .

4. The high-precision active receiver link phase jitter measurement method according to claim 1, characterized in that, The analysis of the signal-to-noise ratio of the received frequency signal of the active receiving link includes: calculating the signal-to-noise ratio of the received frequency signal of the active receiving link. conduct Signal-to-noise ratio of the second measurement ,according to Measurement results of secondary signal-to-noise ratio Calculate the mean signal-to-noise ratio. .

5. The high-precision active receiver link phase jitter measurement method according to claim 1, characterized in that, The calculation of signal phase jitter caused by noise corresponding to the signal-to-noise ratio using the Cramer-Rao bound formula includes: according to The measured mean of the signal-to-noise ratio is used to calculate the noise-induced phase jitter using the Cramer-Rao bound formula. .

6. The high-precision active receiver link phase jitter measurement method according to claim 1, characterized in that, The step of subtracting phase jitter caused by noise from the statistical results of the point frequency signal phase measurement includes: using a multivariate error cascade formula. Calculate the phase jitter results of the active receiver link .

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