CN103472427B - A kind of phase noise measurement accuracy calibration device based on discrete spectrum sequence - Google Patents
A kind of phase noise measurement accuracy calibration device based on discrete spectrum sequence Download PDFInfo
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Abstract
The present invention relates to a kind of phase noise measurement accuracy calibration device based on discrete spectrum sequence, this calibrating installation comprises: synthetic source, at least one set of division device and power splitter, source to be measured, modulator, reference source and phase noise measurement device, the output signal of described synthetic source is through frequency divider and power splitter frequency division, Signal transmissions after frequency division is to combiner, this combiner carries out process to signal and exports discrete spectrum sequence, this discrete spectrum sequence transfers to phase noise measurement device after described modulator, this phase noise measurement device also receives the signal from source to be measured simultaneously, and the signal in described discrete spectrum sequence and source to be measured is measured, the result measured inputs to described modulator by the voltage-controlled output terminal of phase noise measurement device through reference source.This calibrating installation can realize the accuracy measurement in carrier frequency far away and nearly carrier frequency analysis fourier frequency range 0.01Hz ~ 100MHz, improves measuring accuracy simultaneously, can also provide the error of measurement result immediately.
Description
Technical field
The present invention relates to phase noise measurement device, particularly relate to a kind of phase noise measurement accuracy calibration device based on discrete spectrum sequence.
Background technology
Phase noise measurement device in the market mainly comprises HP3047A, HP3048A, E5500 series and the PN9000 etc. of introduction, and the composition of these devices mainly comprises phase-sensitive detector, phase-locked loop, low noise amplifier, data acquisition and computing machine.Can calibrate its part index number according to national military standard GJB/G3414-98 " phase noise measuring system vertification regulation "/examine and determine, but cannot the phase noise measurement result precision of phase noise measurement system be calibrated/be examined and determine.
Because high stability crystal oscillator and atomic frequency standard are widely used in time base, the local oscillator of radar microwave link and the time base of communication electronic system of electronic equipment on satellite, the phase noise characteristic of its carrier frequency far away and nearly carrier frequency is especially paid close attention to.So when using phase noise measurement system to measure it, measurement result accuracy has strict requirement.
The domestic calibration for phase noise measurement result precision at present, by the comparison of multiple stage phase noise measurement system, can only realize the value uniform operational of phase noise.This method Problems existing is: the measurement 1, not to the accuracy of nearly carrier phase noise measurement; 2, matching measurement precision is not high, and uncertainty of measurement is 3dB; 3, measurement result can not be provided immediately, after needing multiple stage comparison, add up, just can obtain a result.
Summary of the invention
For above the deficiencies in the prior art, the invention provides a kind of phase noise measurement accuracy calibration device based on discrete spectrum sequence, the application of this device can solve the problem of tracing to the source of the phase noise measurement result precision of carrier frequency far away and nearly carrier frequency.
Object of the present invention is achieved through the following technical solutions:
A kind of phase noise measurement accuracy calibration device based on discrete spectrum sequence, this calibrating installation comprises: synthetic source, at least one set of division device and power splitter, source to be measured, modulator, reference source and phase noise measurement device, the output signal of described synthetic source is through frequency divider and power splitter frequency division, Signal transmissions after frequency division is to combiner, this combiner carries out process to signal and exports discrete spectrum sequence, this discrete spectrum sequence transfers to phase noise measurement device after described modulator, this phase noise measurement device also receives the signal from source to be measured simultaneously, and the signal in described discrete spectrum sequence and source to be measured is measured, the result measured inputs to described modulator by the voltage-controlled output terminal of phase noise measurement device through reference source.
Described frequency divider and power splitter group are: power splitter A, and the signal received from synthetic source is divided into two paths of signals by this power splitter A, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider A and carried out very frequently;
Signal after very is frequently given power splitter B and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider B and carried out very frequently; Signal after very is frequently given power splitter C and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider C and carried out very frequently; Signal after very is frequently given power splitter D and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider D and carried out very frequently; Signal after very is frequently given power splitter E and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider E and carried out very frequently; Signal after very is frequently given power splitter F and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider F and carried out very frequently; Signal after very is frequently given power splitter H and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider H and carried out very frequently; Signal after very is frequently given power splitter I and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider I and carried out very frequently; Signal after very is frequently given power splitter J and is divided into two paths of signals, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider J and carried out very frequently, and the signal after very frequently gives combiner.
Phase noise measurement accuracy calibration device based on discrete spectrum sequence overcomes the transmission source adopted at present and to compare the deficiency measured, and it has the following advantages: 1, can realize carrier frequency far away and nearly carrier frequency and analyze accuracy measurement in fourier frequency range 0.01Hz ~ 100MHz; 2, precision improves, and uncertainty can control in 0.5dB; 3, the error of measurement result can be provided immediately.
Accompanying drawing explanation
Fig. 1: structure principle chart of the present invention.
Embodiment
If Fig. 1 is structure principle chart of the present invention, a kind of phase noise measurement accuracy calibration device based on discrete spectrum sequence, comprise: reference source, source to be measured, phase noise measurement device, also comprise: DDS synthetic source, power splitter A, power splitter B, power splitter C, power splitter D, power splitter E, power splitter F, power splitter H, power splitter I, power splitter J, frequency divider A, frequency divider B, frequency divider C, frequency divider D, frequency divider E, frequency divider F, frequency divider H, frequency divider I, frequency divider J, combiner, modulator.
DDS synthetic source 1 output terminal is connected with the input end radio-frequency cable of power splitter 2A, the discrete end of power splitter 2A holds radio-frequency cable to be connected with the 25MHz of combiner 20, the frequency division end of power splitter 2A is connected with the input end radio-frequency cable of frequency divider 3A, the output terminal of frequency divider 3A is connected with the input end radio-frequency cable of power splitter 4B, the discrete end of power splitter 4B holds radio-frequency cable to be connected with the 2.5MHz of combiner 20, the frequency division end of power splitter 4B is connected with the input end radio-frequency cable of frequency divider 5B, the output terminal of frequency divider 5B is connected with the input end radio-frequency cable of power splitter 6C, the discrete end of power splitter C holds radio-frequency cable to be connected with the 250kHz of combiner 20, the frequency division end of power splitter 6C is connected with the input end radio-frequency cable of frequency divider 7C, the output terminal of frequency divider 7C is connected with the input end radio-frequency cable of power splitter 8D, the discrete end of power splitter 8D holds radio-frequency cable to be connected with the 25kHz of combiner 20, the frequency division end of power splitter 8D is connected with the input end radio-frequency cable of frequency divider 9D, the output terminal of frequency divider 9D is connected with the input end radio-frequency cable of power splitter 10E, the discrete end of power splitter 10E holds radio-frequency cable to be connected with the 2.5kHz of combiner 20, the frequency division end of power splitter 10E is connected with the input end radio-frequency cable of frequency divider 11E, the output terminal of frequency divider 11E is connected with the input end radio-frequency cable of power splitter 12F, the discrete end of power splitter 12F holds radio-frequency cable to be connected with the 250Hz of combiner 20, the frequency division end of power splitter 12F is connected with the input end radio-frequency cable of frequency divider 13F, the output terminal of frequency divider 13F is connected with the input end radio-frequency cable of power splitter 14H, the discrete end of power splitter H holds radio-frequency cable to be connected with the 25Hz of combiner 20, the frequency division end of power splitter 14H is connected with the input end radio-frequency cable of frequency divider 15H, the output terminal of frequency divider 15H is connected with the input end radio-frequency cable of power splitter 16I, the discrete end of power splitter 16I holds radio-frequency cable to be connected with the 2.5Hz of combiner 20, the frequency division end of power splitter 16I is connected with the input end radio-frequency cable of frequency divider 17I, the output terminal of frequency divider 17I is connected with the input end radio-frequency cable of power splitter 18J, the discrete end of power splitter 18J holds radio-frequency cable to be connected with the 2.5kHz of combiner 20, the frequency division end of power splitter 18J is connected with the input end radio-frequency cable of frequency divider 19J, the output terminal of frequency divider 19J holds radio-frequency cable to be connected with the 0.25Hz of combiner 20.The output terminal of combiner 20 is connected with the discrete end radio-frequency cable of modulator 21, the carrier wave end of modulator 21 is connected with the output terminal radio-frequency cable of reference source 22, the output terminal of reference source 22 is connected with the local oscillator end radio-frequency cable of phase noise measurement device 24, the output terminal in source 23 to be measured is connected with the radio-frequency head radio-frequency cable of phase noise measurement device 24, and the voltage-controlled output terminal of phase noise measurement device 24 is connected with the voltage-controlled input end radio-frequency cable of reference source 22.
During work, the output signal frequency of DDS synthetic source 1 is 25MHz, this signal separates two-way through power splitter 2A merit, one tunnel is sent into combiner 20 and is carried out signal syntheses, another road is carried out very frequently through frequency divider 3A, signal frequency after frequency division is 2.5MHz, this signal separates two paths of signals through power splitter 4B merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 5B, signal frequency after frequency division is 250kHz, this signal separates two paths of signals through power splitter 6C merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 7C, signal frequency after frequency division is 25kHz, this signal separates two paths of signals through power splitter 8D merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 9D, signal frequency after frequency division is 2.5kHz, this signal separates two paths of signals through power splitter 10E merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 11E, signal frequency after frequency division is 250Hz, this signal separates two paths of signals through power splitter 12F merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 13F, signal frequency after frequency division is 25Hz, this signal separates two paths of signals through power splitter 14H merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 15H, signal frequency after frequency division is 2.5Hz, this signal separates two paths of signals through power splitter 16I merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 17I, signal frequency after frequency division is 0.25Hz, this signal separates two paths of signals through power splitter 18J merit, one tunnel is sent into combiner and is carried out signal syntheses, another road is carried out very frequently through frequency divider 19J, signal frequency after frequency division is 0.025Hz, this signal is sent into combiner and is carried out signal syntheses.The frequency of the discrete spectrum sequence that combiner exports is respectively 25MHz, 2.5MHz, 250kHz, 25kHz, 2.5kHz, 250Hz, 25Hz, 2.5Hz, 0.25Hz, 0.025Hz.The discrete spectrum sequence that combiner exports is by modulators modulate on the sideband of reference source, and through carrying out precise calibration to the discrete spectral line on reference source sideband, the power spectrum density of these discrete spectral lines is known ξ
1.Adopt phase noise measurement device to measure through the reference source of discrete spectrum sequence modulation and source to be measured, in measurement result, the measured value of the discrete spectrum sequence of reference source is ξ
2, so in this phase noise measurement process, the analysis fourier frequency range of carrier frequency far away and nearly carrier frequency is 0.01Hz ~ 100MHz, and measurement result accuracy calibration result is ξ
2-ξ
1.
Should be appreciated that above is illustrative and not restrictive by preferred embodiment to the detailed description that technical scheme of the present invention is carried out.Those of ordinary skill in the art can modify to the technical scheme described in each embodiment on the basis of reading instructions of the present invention, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (1)
1. the phase noise measurement accuracy calibration device based on discrete spectrum sequence, it is characterized in that, this calibrating installation comprises: synthetic source, at least one set of division device and power splitter, source to be measured, modulator, reference source and phase noise measurement device, the output signal of described synthetic source is through frequency divider and power splitter frequency division, Signal transmissions after frequency division is to combiner, this combiner carries out process to signal and exports discrete spectrum sequence, this discrete spectrum sequence transfers to phase noise measurement device after described modulator, this phase noise measurement device also receives the signal from source to be measured simultaneously, and the signal in described discrete spectrum sequence and source to be measured is measured, the result measured inputs to described modulator by the voltage-controlled output terminal of phase noise measurement device through reference source,
A described set of division device and power splitter are: power splitter A, and the signal received from synthetic source is divided into two paths of signals by this power splitter A, and a road signal is sent into combiner and carried out signal syntheses, and a road signal is given frequency divider A and carried out very frequently; Carry out the signal very frequently through frequency divider A to give power splitter B and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider B and carried out very frequently; Carry out the signal very frequently through frequency divider B to give power splitter C and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider C and carried out very frequently; Carry out the signal very frequently through frequency divider C to give power splitter D and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider D and carried out very frequently; Carry out the signal very frequently through frequency divider D to give power splitter E and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider E and carried out very frequently; Carry out the signal very frequently through frequency divider E to give power splitter F and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider F and carried out very frequently; Carry out the signal very frequently through frequency divider F to give power splitter H and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider H and carried out very frequently; Carry out the signal very frequently through frequency divider H to give power splitter I and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider I and carried out very frequently; Carry out the signal very frequently through frequency divider I to give power splitter J and be divided into two paths of signals, a road signal is sent into combiner and is carried out signal syntheses, and a road signal is given frequency divider J and carried out very frequently, carries out the signal very frequently give combiner through frequency divider J.
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| CN104883155B (en) * | 2014-02-27 | 2019-09-13 | 南京中兴新软件有限责任公司 | A kind of production method and device of discrete domain phase noise |
| CN110995378B (en) * | 2019-11-26 | 2021-10-15 | 中电科思仪科技股份有限公司 | Noise coefficient measurement uncertainty calculator and error analysis method |
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