CN103472427A - Phase noise measuring accuracy calibration device based on discrete spectrum sequence - Google Patents
Phase noise measuring accuracy calibration device based on discrete spectrum sequence Download PDFInfo
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- CN103472427A CN103472427A CN2013104472134A CN201310447213A CN103472427A CN 103472427 A CN103472427 A CN 103472427A CN 2013104472134 A CN2013104472134 A CN 2013104472134A CN 201310447213 A CN201310447213 A CN 201310447213A CN 103472427 A CN103472427 A CN 103472427A
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Abstract
The invention relates to a phase noise measuring accuracy calibration device based on a discrete spectrum sequence. The calibration device comprises a synthesized source, at least one set of a frequency divider and a power divider, a source to be detected, a modulator, a reference source and a phase noise measuring device. An output signal of the synthesized source undergoes frequency division by the frequency divider and the power divider and the signal which underwent frequency division is transmitted to a combiner. The combiner processes the signal and outputs the discrete spectrum sequence. The discrete spectrum sequence is transmitted to a phase noise measuring device after passing the modulator and meanwhile, the phase noise measuring device further receives a signal from the source to be detected and measures the discrete spectrum sequence and the signal of the source to be detected. A measurement result is transmitted into the modulator through a voltage control output end of the phase noise measuring device after passing the reference source. The calibration device can perform accuracy measurement within the range from 0.01Hz to 100MHz of the far carrier frequency and close carrier frequency analyzing Fourier frequency and meanwhile, the measuring precision is improved and errors of the measurement result can be given instantly.
Description
Technical field
The present invention relates to the phase noise measurement device, particularly relate to a kind of phase noise measurement accuracy calibrating installation based on the 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 be calibrated its part index number/be examined and determine according to national military standard GJB/G3414-98 " phase noise measuring system vertification regulation ", but can't be calibrated/examine and determine the phase noise measurement result precision of phase noise measurement system.
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 spaceborne electronic equipment, the phase noise characteristic of its carrier frequency far away and nearly carrier frequency is especially paid close attention to.So, while using the phase noise measurement system to be measured it, the measurement result accuracy has strict requirement.
The domestic calibration for the phase noise measurement result precision at present, can only, by the comparison of many phase noise measurement systems, realize that the value of phase noise is unified work.The problem that this method exists is: 1, there is no the measurement to nearly carrier frequency phase noise measurement result precision; 2, the matching measurement precision is not high, and uncertainty of measurement is 3dB; 3, can not provide immediately measurement result, after needing many comparisons, be added 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 calibrating installation based on the 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.
Purpose of the present invention is achieved through the following technical solutions:
A kind of phase noise measurement accuracy calibrating installation based on the 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 after frequency division transfers to combiner, this combiner is processed output discrete spectrum sequence to signal, this discrete spectrum sequence transfers to the 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 of measuring 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 that this power splitter A will receive from synthetic source is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider A and is carried out very frequently;
Signal after is very frequently given power splitter B and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider B and carried out very frequently; Signal after is very frequently given power splitter C and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider C and carried out very frequently; Signal after is very frequently given power splitter D and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider D and carried out very frequently; Signal after is very frequently given power splitter E and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider E and carried out very frequently; Signal after is very frequently given power splitter F and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider F and carried out very frequently; Signal after is very frequently given power splitter H and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider H and carried out very frequently; Signal after is very frequently given power splitter I and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider I and carried out very frequently; Signal after is very frequently given power splitter J and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider J and carried out very frequently, and the signal after is very frequently given combiner.
The deficiency of comparing and measure in the transmission source that phase noise measurement accuracy calibrating installation based on the discrete spectrum sequence has overcome current employing, it has the following advantages: 1, can realize that carrier frequency far away and nearly carrier frequency analyze the accuracy measurement in Fu Shi frequency range 0.01Hz～100MHz; 2, precision improves, and uncertainty can be controlled in 0.5dB; 3, can provide immediately the error of measurement result.
The accompanying drawing explanation
Fig. 1: structure principle chart of the present invention.
Embodiment
As Fig. 1 is structure principle chart of the present invention, a kind of phase noise measurement accuracy calibrating installation based on the 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 is connected with the 25MHz end-fire frequency cable 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 is connected with the 2.5MHz end-fire frequency cable 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 is connected with the 250kHz end-fire frequency cable 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 is connected with the 25kHz end-fire frequency cable 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 is connected with the 2.5kHz end-fire frequency cable 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 is connected with the 250Hz end-fire frequency cable 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 is connected with the 25Hz end-fire frequency cable 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 is connected with the 2.5Hz end-fire frequency cable 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 is connected with the 2.5kHz end-fire frequency cable 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 is connected with the 0.25Hz end-fire frequency cable 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-fire 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, combiner 20 is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 3A on another road, signal frequency after frequency division is 2.5MHz, this signal separates two paths of signals through power splitter 4B merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 5B on another road, signal frequency after frequency division is 250kHz, this signal separates two paths of signals through power splitter 6C merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 7C on another road, signal frequency after frequency division is 25kHz, this signal separates two paths of signals through power splitter 8D merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 9D on another road, signal frequency after frequency division is 2.5kHz, this signal separates two paths of signals through power splitter 10E merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 11E on another road, signal frequency after frequency division is 250Hz, this signal separates two paths of signals through power splitter 12F merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 13F on another road, signal frequency after frequency division is 25Hz, this signal separates two paths of signals through power splitter 14H merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 15H on another road, signal frequency after frequency division is 2.5Hz, this signal separates two paths of signals through power splitter 16I merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 17I on another road, signal frequency after frequency division is 0.25Hz, this signal separates two paths of signals through power splitter 18J merit, combiner is sent on one tunnel, and to carry out signal synthetic, carry out very frequently through frequency divider 19J on another road, signal frequency after frequency division is 0.025Hz, this signal is sent into combiner, and to carry out signal synthetic.The frequency of the discrete spectrum sequence of combiner output is respectively 25MHz, 2.5MHz, 250kHz, 25kHz, 2.5kHz, 250Hz, 25Hz, 2.5Hz, 0.25Hz, 0.025Hz.The discrete spectrum sequence of combiner output is by modulators modulate to the sideband of reference source, and through the discrete spectral line on the reference source sideband is carried out to precise calibration, the power spectrum density of these discrete spectral lines is known ξ
1.Adopt the phase noise measurement device to be measured reference source and source to be measured through the discrete spectrum sequence modulation, in measurement result, the measured value of the discrete spectrum sequence of reference source is ξ
2, in this phase noise measurement process, the analysis Fu Shi frequency range of carrier frequency far away and nearly carrier frequency is 0.01Hz～100MHz so, measurement result accuracy calibration result is ξ
2-ξ
1.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can put down in writing each embodiment on the basis of instructions of the present invention, or part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (2)
1. the phase noise measurement accuracy calibrating installation based on the 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 after frequency division transfers to combiner, this combiner is processed output discrete spectrum sequence to signal, this discrete spectrum sequence transfers to the 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 of measuring inputs to described modulator by the voltage-controlled output terminal of phase noise measurement device through reference source.
2. a kind of phase noise measurement accuracy calibrating installation based on the discrete spectrum sequence according to claim 1, it is characterized in that, described frequency divider and power splitter group are: power splitter A, the signal that this power splitter A will receive from synthetic source is divided into two paths of signals, one road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider A and carried out very frequently; Signal after is very frequently given power splitter B and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider B and carried out very frequently; Signal after is very frequently given power splitter C and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider C and carried out very frequently; Signal after is very frequently given power splitter D and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider D and carried out very frequently; Signal after is very frequently given power splitter E and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider E and carried out very frequently; Signal after is very frequently given power splitter F and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider F and carried out very frequently; Signal after is very frequently given power splitter H and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider H and carried out very frequently; Signal after is very frequently given power splitter I and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider I and carried out very frequently; Signal after is very frequently given power splitter J and is divided into two paths of signals, and a road signal is sent into combiner, and to carry out signal synthetic, and a road signal is given frequency divider J and carried out very frequently, and the signal after is very frequently given combiner.
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