CN108802651A - A kind of the on-line amending device and modification method of Noise Factor Analyzer temperature drift - Google Patents
A kind of the on-line amending device and modification method of Noise Factor Analyzer temperature drift Download PDFInfo
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- CN108802651A CN108802651A CN201810583648.4A CN201810583648A CN108802651A CN 108802651 A CN108802651 A CN 108802651A CN 201810583648 A CN201810583648 A CN 201810583648A CN 108802651 A CN108802651 A CN 108802651A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of on-line amending device of Noise Factor Analyzer temperature drift and modification methods, belong to Electronic Testing Technology field, and on-line calibration circuit includes calibration switch and noise source.The present invention can start on-line calibration function automatically according to the variation of Noise Factor Analyzer cabinet inside temperature, the shortcomings that avoiding the need for artificially deciding whether to recalibrate according to measurement result and variation of ambient temperature, reduce the technology requirement to survey crew；The input port that measured piece reconnect noise source to Noise Factor Analyzer need not be removed when on-line calibration is calibrated, improve the convenience and measurement efficiency of calibration, it reduces because the variation of Noise Factor Analyzer performance indicator does not carry out the risk that calibration introduces measurement error in time, improves measurement accuracy.
Description
Technical field
The invention belongs to Electronic Testing Technology fields, and in particular to a kind of on-line amending dress of Noise Factor Analyzer temperature drift
It sets and modification method.
Background technology
Any circuit system can all generate noise, and to limiting circuit and system receives and the ability of processing small-signal.
Noise coefficient is mostly important one of the parameter of sample circuit processing small-signal ability, and microwave and millimeter wave communication, is led at radar
The technological progress of the electronic equipments such as boat, accurate guidance and equipment is all closely related with the receiver technology that increasingly improves, wherein very
Important one side is exactly the noise for reducing receiver itself as far as possible and generating, noise-reduction coefficient.As equipment technology is sent out
Exhibition is maked rapid progress, and the requirement to low-noise device is more and more urgent, also proposed to noise coefficient index measurement precision more next
It is reliable to improve system for optimization complete machine size, weight, cost and performance for higher requirement, high-precision noise-factor measurement
Property is of great significance.
Noise coefficient generally use Noise Factor Analyzer measures, and must be calibrated first before measuring, calibration
When the noise source of precise calibration is connected to the input port of Noise Factor Analyzer, pass through the noise accurately known to characteristic
Source cold conditions and the noise power of hot output measure respectively, it may be determined that go out the noise coefficient of Noise Factor Analyzer itself
With two error parameters of gain bandwidth product.What is actually obtained when measured piece measurement analyzed by measured piece and noise coefficient
The whole result of the two-level concatenation system of instrument composition, according to calibration as a result, using two level error correcting technology removal noise system
Influence of the error that number analyzer itself introduces to measurement result, so that it may to obtain the accurate noise-factor measurement knot of measured piece
Fruit.In order to ensure the error correction precision after calibration, it is desirable that the performance characteristics of Noise Factor Analyzer itself must protect after calibration
It holds constant.
But the performance indicator of various microwave and millimeter wave semiconductor devices itself all can variation with temperature drift about, such as
The indexs such as the conversion loss of frequency mixer, gain of microwave and millimeter wave amplifier all can be with temperature in Noise Factor Analyzer receiving channel
Degree variation.The receiving circuit high sensitivity of Noise Factor Analyzer, gain are big, while the noise coefficient of circuit module is inherently
The function of temperature, therefore the performance characteristics of receiving channel vary with temperature clearly.When Noise Factor Analyzer cabinet inside
Temperature when changing, will necessarily influence to miss because have differences when actual performance index and the calibration of Noise Factor Analyzer
The modified precision of difference, introduces measurement error.And to eliminate measurement error, it is necessary to remove measured piece, connection noise source to noise
The input port of coefficient analysis instrument, re-starts calibration, and inconvenience is brought to measurement.
Traditional Noise Factor Analyzer receiving circuit is defeated as shown in Figure 1, limited by current existing device performance index
The signal entered first passes around that band switch is divided into radio band and microwave section carries out mixing reception respectively.Reception positioned at radio band is believed
It number carries out low-pass filtering first after band switch, filters out image frequency and other higher order signals, ensure only to receive the measurement needed
Signal.Then it is received through lawnmower low noise amplification, the mixing of radio frequency superhet, during variable radiofrequency signal is become fixed
Frequency signal.Positioned at microwave section signal after band switch enter microwave receiving circuit, carry out preposition amplification first, then into
The centre frequency of row tunable band-pass filtering, bandpass filter changes with receives frequency, filters out image frequency signal and other high-orders letter
Number, ensure only to receive the microwave segment signal needed, then believes the microwave of different frequency through microwave superhet mixing receiving circuit
Number all become fixed intermediate-freuqncy signal, no matter the superhet mixing receiving circuit of radio frequency or microwave usually all includes multistage mixing
Circuit.Intermediate-freuqncy signal obtained by radio frequency and microwave mixer synthesizes all the way after intermediate frequency amplification and IF switch, using middle frequency modulation
The amplitude of intermediate-freuqncy signal is improved the amplitude handled to suitable analog-digital converter by reason circuit, believes analog intermediate frequency through analog-digital converter
Number become digital medium-frequency signal, using being further processed the performance number that can obtain noise signal, Noise Factor Analyzer point
It Ce Liang the noise power that is exported in the case where noise source is hot and cold conditions excitation of measured piece, so that it may obtain the noise of measured piece to measure
Coefficient and yield value.
When carrying out measured piece measurement, Noise Factor Analyzer measure noise power be include measured piece and noise coefficient
The noise that analyzer two-stage cascade system generates jointly, therefore determine Noise Factor Analyzer itself firstly the need of by calibration
Performance characteristics remove influence of the Noise Factor Analyzer to measurement accuracy itself when measuring by error correction, could be accurate
Obtain the noise coefficient and yield value of measured piece.
1, Noise Factor Analyzer is calibrated
The hot and accurately known noise source of cold conditions output noise power characteristic is connected to noise coefficient analysis when calibration
The input port of instrument measures corresponding output noise power.Noise source is hot accurately known with the noise temperature of cold conditions, if respectively
For ThAnd Tc, the excess noise ratio (ENR) of noise source is defined as：
In equation (1), T0Referred to as standard noise temperature is equal to 290k.If noise source noise coefficient in hot and cold conditions
The noise power that analyzer measures is respectively N2_ONAnd N2_OFF, when calibration the excess noise ratio of used noise source be ENRCAL, cold
State temperature is TcCALThen have：
Y2For the Y factor of Noise Factor Analyzer itself, F2For the noise coefficient of Noise Factor Analyzer itself, by with
Upper calibration process determines.
2, measurement and error correction
Noise source is connected to the input port of measured piece, the output port and Noise Factor Analyzer of measured piece when measurement
Input port connection, if the noise that Noise Factor Analyzer measures in the case where noise source is hot and two excitation states of cold conditions at this time
Power is respectively N12_ONAnd N12_OFF, when measurement the excess noise ratio of used noise source be ENRMEAS, cold-state temperature TcMEAS,：
Then have
F12For the overall noise coefficient for the two-level concatenation system that measured piece and Noise Factor Analyzer form, the increasing of measured piece
Beneficial G1It is determined by following equation：
According to noise coefficient cascading equations, the noise coefficient F of measured piece1It is determined by following equation：
In this way by the calibration before measurement, error correction when measurement, so that it may obtain the gain G of measured piece to measure1With
Noise coefficient F1Exact value.
The major defect of present technology, which is the performance indicator of complete machine after the completion of requirement Noise Factor Analyzer is calibrated, to be sent out
Raw drift, but the performance indicator of microwave and millimeter wave device can all change with temperature mostly, when Noise Factor Analyzer machine
When temperature inside case changes, the noise coefficient of Noise Factor Analyzer receiving circuit and gain will necessarily be caused to become
Change, when the actual performance index of complete machine necessarily carries out two level error correction with the difference of performance indicator when calibration in measurement process
Measurement error is introduced, and to remove the above error, it is necessary to terminate and measure, remove measured piece, reconnect noise source to noise system
The input port of number analyzer is calibrated.This recalibration process can not only influence the efficiency measured, also can be because measuring people
Member can not determine when re-start calibration, cause measurement result inaccurate.
Invention content
For the above-mentioned technical problems in the prior art, the present invention proposes a kind of Noise Factor Analyzer temperature drift
On-line amending device and modification method, reasonable design overcome the deficiencies in the prior art, have good effect.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of on-line amending device of Noise Factor Analyzer temperature drift, including on-line calibration circuit, on-line calibration circuit packet
Include calibration switch and noise source；
Wherein, calibration switch uses single-pole double-throw switch (SPDT) form, including public port, measurement port and calibration port totally three
A port；Public port connects the band switch of its rear end, and public port is connected with the noise source of calibration port respectively, or with survey
Port connection is measured, measuring signal input is received；It usually measures and when the input port of noise coefficient analysis is calibrated, switchs
It is switched to measurement port, public port is connect with measurement port at this time；When needing to carry out on-line calibration, switching to calibration
Port, the at this time noise source of public port and calibration port connection.
Preferably, which includes constant temperature slot structure, and noise source is arranged in constant temperature slot structure.
Preferably, calibration switch uses electric mechanical switch.
Preferably, which further includes temperature observation circuit, the temperature of the cabinet inside for detection noise coefficient analysis instrument
Degree.
In addition, the present invention is also mentioned that a kind of on-line amending method of Noise Factor Analyzer temperature drift, this method is using as above
The on-line amending device of the Noise Factor Analyzer temperature drift, specifically comprises the following steps：
Step 1：The calibration of Noise Factor Analyzer；
Step 1.1：Noise source known to hot and cold conditions output noise power characteristic is connected to noise coefficient when calibration
The input port of analyzer, calibration switch are switched to measurement port, if noise source Noise Factor Analyzer in hot and cold conditions
The noise power measured is respectively N2_ONAnd N2_OFF, when calibration the excess noise ratio of used noise source be ENRCAL, cold-state temperature
For TcCAL, then have：
Wherein, T0Referred to as standard noise temperature is equal to 290k；Y2For using input port as the noise coefficient of reference planes point
The Y factor of analyzer complete machine；F2For using input port as the own ship's noise coefficient of the Noise Factor Analyzer of reference planes；
Step 1.2：Calibration switch is switched to calibration port, if noise source is made an uproar in hot and cold conditions in on-line calibration circuit
The noise power that sonic system number analyzer measures is respectively N2_ONINTAnd N2_OFFINT, the excess noise ratio of noise source in on-line calibration circuit
For ENRINT, cold-state temperature TcINT, then have：
Wherein, Y2INTFor using the calibration port of calibration switch as the Y factor of the Noise Factor Analyzer complete machine of reference planes,
F2INTFor using the calibration port of calibration switch as the own ship's noise coefficient of the Noise Factor Analyzer complete machine of reference planes；
Step 2：The noise-factor measurement of measured piece and error correction；Specifically comprise the following steps：
Noise source is connected to the input port of measured piece, the output port and Noise Factor Analyzer of measured piece when measurement
Input port connection, calibration switch is switched to measurement port, if at this time in the case where noise source is hot and two excitation states of cold conditions
The noise power that Noise Factor Analyzer measures is respectively N12_ONAnd N12_OFF, when measurement the excess noise ratio of used noise source be
ENRMEAS, cold-state temperature TcMEAS, then have
Wherein, Y12For the whole Y factor for the two-level concatenation system that measured piece and Noise Factor Analyzer form；F12For quilt
Survey the overall noise coefficient of the two-level concatenation system of part and Noise Factor Analyzer composition；
The gain G of measured piece1It is determined by formula (14)：
According to noise coefficient cascading equations, the noise coefficient F of measured piece1It is determined by formula (15)：
Pass through calibration and measurement error amendment, it will be able to which measurement obtains the gain G of measured piece1With noise coefficient F1It is accurate
Value；
Step 3：Correction of temperature drift is calibrated, and is specifically comprised the following steps：
Temperature observation circuit inside Noise Factor Analyzer detects that the temperature change of cabinet inside is more than 5 DEG C, first
First start temperature drift calibration function, calibration switch is switched to calibration port at this time, if in on-line calibration circuit noise source hot and
The noise power that Noise Factor Analyzer measures when cold conditions is respectively N2_ONINTSAnd N2_OFFINTS, noise in on-line calibration circuit
The excess noise ratio in source remains unchanged as ENRINT, cold-state temperature TcINT, then have：
Wherein, Y2INTSFor Noise Factor Analyzer internal circuit performance occur temperature drift when with the calibration port of calibration switch
For the Y factor of the Noise Factor Analyzer complete machine of reference planes, F2INTSOccur for the performance of Noise Factor Analyzer internal circuit
Using the calibration port of calibration switch as the own ship's noise coefficient of the Noise Factor Analyzer complete machine of reference planes when temperature drift；
According to temperature drift calibration result, noise coefficient analysis occurs after temperature drift using input port as the noise coefficient of reference planes
The own ship's noise coefficient of analyzer is modified to F2S, shown in value such as equation (18)：
Wherein, F2To be analyzed by the noise coefficient of reference planes of input port by what formula (9) determined in step 1.1
The own ship's noise coefficient of instrument；F2INTFor step 1.2 by formula (11) determine the calibration port with calibration switch be refer to
The own ship's noise coefficient of the Noise Factor Analyzer complete machine of plane；F2INTSFor the noise determined in step 3 by formula (17)
The performance of coefficient analysis instrument internal circuit occurs to divide by the noise coefficient of reference planes of the calibration port of calibration switch when temperature drift
The own ship's noise coefficient of analyzer complete machine；
Step 4：After completing temperature drift calibration, calibration switch is switched to measurement port and carries out measured piece measurement again, if at this time
It is respectively N in the hot noise power measured with Noise Factor Analyzer under two excitation states of cold conditions of noise source12_ONWith
N12_OFF, when measurement the excess noise ratio of used noise source be ENRMEAS, cold-state temperature TcMEAS；
According to temperature drift calibration result, the gain G of measured piece is obtained1With noise coefficient F1Formula amendment the following is：
Wherein, N2_ONAnd N2_OFFWhen step 1.1 is calibrated, measurement obtains, ENRCALNoise is used when being calibrated by step 1.1
The excess noise ratio in source, N2_ONINTAnd N2_OFFINTWhen carrying out step 1.2 calibration, measurement obtains, N2_ONINTSAnd N2_OFFINSIn step 3 temperature
Measurement obtains when calibration is corrected in drift；
Above in formula, F2SIt is determined by step (3) and formula (18), F12The noise power measured by step (4)
N12_ON、N12_OFFAnd formula (12) and formula (13) determine that G1 is determined by step 4 and formula (19)；
It is automatic to start temperature drift calibration function when Noise Factor Analyzer monitors that the temperature change of cabinet inside is excessive,
According to temperature drift calibration result, the gain G of measured piece is calculated using formula (19) and formula (20)1With noise coefficient F1, can correct and make an uproar
Sonic system number analyzer measurement error caused by temperature drift.
Advantageous effects caused by the present invention：
The present invention proposes a kind of device that can be corrected Noise Factor Analyzer temperature drift error, can carry out on-line calibration,
Level-one on-line calibration circuit is introduced on the basis of conventional noise coefficient analysis instrument receiving circuit, when instrument detects cabinet inside
Temperature change is more than certain numerical value, automatically switches to internal on-line calibration circuit and is calibrated, and when on-line calibration needs not to be removed
Measured piece reconnects noise source to the input port of Noise Factor Analyzer, substantially increases the convenience of calibration, reduces
Professional technique requirement to instrument user of service；
The present invention proposes a kind of method for correcting Noise Factor Analyzer temperature drift error, according to on-line calibration result and survey
Port calibration result before amount improves the calculation formula for obtaining measured piece gain and noise coefficient, eliminates port school
Influence of the overall performance index drift to measurement accuracy when Noise Factor Analyzer cabinet inside temperature change, improves survey after standard
Accuracy of measurement；
The present invention can start on-line calibration function automatically according to the variation of Noise Factor Analyzer cabinet inside temperature, avoid
The shortcomings that needing artificially to decide whether to recalibrate according to measurement result and variation of ambient temperature reduces to measuring people
The technology requirement of member；
The input port that measured piece reconnects noise source to Noise Factor Analyzer need not be removed when on-line calibration to carry out
Calibration, improve the convenience and measurement efficiency of calibration, reduce because Noise Factor Analyzer performance indicator variation not in time into
Row calibration introduces the risk of measurement error, improves measurement accuracy.
Description of the drawings
Fig. 1 is traditional Noise Factor Analyzer receiving circuit figure.
Fig. 2 is the circuit diagram of the on-line amending of Noise Factor Analyzer temperature drift of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific implementation mode invention is further described in detail：
Embodiment 1：
A kind of on-line amending device of Noise Factor Analyzer temperature drift, circuit is as shown in Fig. 2, including on-line calibration electricity
Road, on-line calibration circuit include calibration switch and noise source；
Wherein, calibration switch uses single-pole double-throw switch (SPDT) form, including public port, measurement port and calibration port totally three
A port；The band switch of public port output connection its rear end, public port are connected with the noise source of calibration port respectively, or
It is connect with measurement port, receives measuring signal input；When the input port for usually measuring and being analyzed in noise coefficient is calibrated,
Switching is connect to measurement port, at this time public port with measurement port；When needing to carry out on-line calibration, switching arrives
Calibration port, the at this time noise source of public port and calibration port connection.
The correcting device includes constant temperature slot structure, and noise source is arranged in constant temperature slot structure.
Calibration switch uses electric mechanical switch.
The device further includes temperature observation circuit, the temperature of the cabinet inside for detection noise coefficient analysis instrument.
Embodiment 2：
On the basis of the above embodiments, the present invention is also mentioned that a kind of on-line amending side of Noise Factor Analyzer temperature drift
Method specifically comprises the following steps：
Step 1：The calibration of Noise Factor Analyzer；
Step 1.1：Noise source known to hot and cold conditions output noise power characteristic is connected to noise coefficient when calibration
The input port of analyzer, calibration switch are switched to measurement port, if noise source Noise Factor Analyzer in hot and cold conditions
The noise power measured is respectively N2_ONAnd N2_OFF, when calibration the excess noise ratio of used noise source be ENRCAL, cold-state temperature
For TcCAL, then have：
Wherein, T0Referred to as standard noise temperature is equal to 290k；Y2For using input port as the noise coefficient of reference planes point
The Y factor of analyzer complete machine；F2For using input port as the own ship's noise coefficient of the Noise Factor Analyzer of reference planes；
Step 1.2：Calibration switch is switched to calibration port, if noise source is made an uproar in hot and cold conditions in on-line calibration circuit
The noise power that sonic system number analyzer measures is respectively N2_ONINTAnd N2_OFFINT, the excess noise ratio of noise source in on-line calibration circuit
For ENRINT, cold-state temperature TcINT, then have：
Wherein, Y2INTFor using the calibration port of calibration switch as the Y factor of the Noise Factor Analyzer complete machine of reference planes,
F2INTFor using the calibration port of calibration switch as the own ship's noise coefficient of the Noise Factor Analyzer complete machine of reference planes；
Step 2：The noise-factor measurement of measured piece and error correction；Specifically comprise the following steps：
Noise source is connected to the input port of measured piece, the output port and Noise Factor Analyzer of measured piece when measurement
Input port connection, calibration switch is switched to measurement port, if at this time in the case where noise source is hot and two excitation states of cold conditions
The noise power that Noise Factor Analyzer measures is respectively N12_ONAnd N12_OFF, when measurement the excess noise ratio of used noise source be
ENRMEAS, cold-state temperature TcMEAS, then have
Wherein, Y12For the whole Y factor for the two-level concatenation system that measured piece and Noise Factor Analyzer form；F12For quilt
Survey the overall noise coefficient of the two-level concatenation system of part and Noise Factor Analyzer composition；
The gain G of measured piece1It is determined by formula (14)：
According to noise coefficient cascading equations, the noise coefficient F of measured piece1It is determined by formula (15)：
Pass through calibration and measurement error amendment, it will be able to which measurement obtains the gain G of measured piece1With noise coefficient F1It is accurate
Value；
Step 3：Correction of temperature drift is calibrated, and is specifically comprised the following steps：
Temperature observation circuit inside Noise Factor Analyzer detects that the temperature change of cabinet inside is more than 5 DEG C, first
First start temperature drift calibration function, calibration switch is switched to calibration port at this time, if in on-line calibration circuit noise source hot and
The noise power that Noise Factor Analyzer measures when cold conditions is respectively N2_ONINTSAnd N2_OFFINTS, noise in on-line calibration circuit
The excess noise ratio in source remains unchanged as ENRINT, cold-state temperature TcINT, then have：
Wherein, Y2INTSFor Noise Factor Analyzer internal circuit performance occur temperature drift when with the calibration port of calibration switch
For the Y factor of the Noise Factor Analyzer complete machine of reference planes, F2INTSOccur for the performance of Noise Factor Analyzer internal circuit
Using the calibration port of calibration switch as the own ship's noise coefficient of the Noise Factor Analyzer complete machine of reference planes when temperature drift；
According to temperature drift calibration result, noise coefficient analysis occurs after temperature drift using input port as the noise coefficient of reference planes
The own ship's noise coefficient of analyzer is modified to F2S, shown in value such as equation (18)：
Wherein, F2To be analyzed by the noise coefficient of reference planes of input port by what formula (9) determined in step 1.1
The own ship's noise coefficient of instrument；F2INTFor step 1.2 by formula (11) determine the calibration port with calibration switch be refer to
The own ship's noise coefficient of the Noise Factor Analyzer complete machine of plane；F2INTSFor the noise determined in step 3 by formula (17)
The performance of coefficient analysis instrument internal circuit occurs to divide by the noise coefficient of reference planes of the calibration port of calibration switch when temperature drift
The own ship's noise coefficient of analyzer complete machine；
Step 4：After completing temperature drift calibration, calibration switch is switched to measurement port and carries out measured piece measurement again, if at this time
It is respectively N in the hot noise power measured with Noise Factor Analyzer under two excitation states of cold conditions of noise source12_ONWith
N12_OFF, when measurement the excess noise ratio of used noise source be ENRMEAS, cold-state temperature TcMEAS；
According to temperature drift calibration result, the gain G of measured piece is obtained1With noise coefficient F1Formula amendment the following is：
Wherein, N2_ONAnd N2_OFFWhen step 1.1 is calibrated, measurement obtains, ENRCALNoise is used when being calibrated by step 1.1
The excess noise ratio in source, N2_ONINTAnd N2_OFFINTWhen carrying out step 1.2 calibration, measurement obtains, N2_ONINTSAnd N2_OFFINSIn step 3 temperature
Measurement obtains when calibration is corrected in drift；
Above in formula, F2SIt is determined by step (3) and formula (18), F12The noise power measured by step (4)
N12_ON、N12_OFFAnd formula (12) and formula (13) determine that G1 is determined by step 4 and formula (19)；
It is automatic to start temperature drift calibration function when Noise Factor Analyzer monitors that the temperature change of cabinet inside is excessive,
According to temperature drift calibration result, the gain G of measured piece is calculated using formula (19) and formula (20)1With noise coefficient F1, can correct and make an uproar
Sonic system number analyzer measurement error caused by temperature drift.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention should also belong to the present invention's
Protection domain.
Claims (5)
1. a kind of on-line amending device of Noise Factor Analyzer temperature drift, it is characterised in that：Including on-line calibration circuit, online school
Quasi- circuit includes calibration switch and noise source；
Wherein, calibration switch uses single-pole double-throw switch (SPDT) form, including public port, measurement port and calibration port to hold for totally three
Mouthful；Public port connects the band switch of its rear end, and public port is connected with the noise source of calibration port respectively, or and measurement end
Mouth connection receives measuring signal input；When the input port for usually measuring and being analyzed in noise coefficient is calibrated, switching
To measurement port, public port is connect with measurement port at this time；When needing to carry out on-line calibration, switching to calibration terminal
Mouthful, the noise source of public port and calibration port connects at this time.
2. the on-line amending device of Noise Factor Analyzer temperature drift according to claim 1, it is characterised in that：The amendment fills
It sets including constant temperature slot structure, noise source is arranged in constant temperature slot structure.
3. the on-line amending device of Noise Factor Analyzer temperature drift according to claim 1, it is characterised in that：Calibration switch
Using electric mechanical switch.
4. the on-line amending device of Noise Factor Analyzer temperature drift according to claim 1, it is characterised in that：The device is also
Including temperature observation circuit, the temperature of the cabinet inside for detection noise coefficient analysis instrument.
5. a kind of on-line amending method of Noise Factor Analyzer temperature drift, it is characterised in that：Using making an uproar as described in claim 1
The on-line amending device of sonic system number analyzer temperature drift, specifically comprises the following steps：
Step 1：The calibration of Noise Factor Analyzer；
Step 1.1：Noise source known to hot and cold conditions output noise power characteristic is connected to noise coefficient analysis when calibration
The input port of instrument, calibration switch are switched to measurement port, if noise source Noise Factor Analyzer in hot and cold conditions measures
To noise power be respectively N2_ONAnd N2_OFF, when calibration the excess noise ratio of used noise source be ENRCAL, cold-state temperature is
TcCAL, then have：
Wherein, T0Referred to as standard noise temperature is equal to 290k；Y2For using input port as the Noise Factor Analyzer of reference planes
The Y factor of complete machine；F2For using input port as the own ship's noise coefficient of the Noise Factor Analyzer of reference planes；
Step 1.2：Calibration switch is switched to calibration port, if noise source noise system in hot and cold conditions in on-line calibration circuit
The noise power that number analyzer measures is respectively N2_ONINTAnd N2_OFFINT, the excess noise ratio of noise source is in on-line calibration circuit
ENRINT, cold-state temperature TcINT, then have：
Wherein, Y2INTFor using the calibration port of calibration switch as the Y factor of the Noise Factor Analyzer complete machine of reference planes, F2INT
For using the calibration port of calibration switch as the own ship's noise coefficient of the Noise Factor Analyzer complete machine of reference planes；
Step 2：The noise-factor measurement of measured piece and error correction；Specifically comprise the following steps：
Noise source is connected to the input port of measured piece when measurement, the output port of measured piece and Noise Factor Analyzer it is defeated
Inbound port connects, and calibration switch is switched to measurement port, if the noise in the case where noise source is hot and two excitation states of cold conditions at this time
The noise power that coefficient analysis instrument measures is respectively N12_ONAnd N12_OFF, when measurement the excess noise ratio of used noise source be
ENRMEAS, cold-state temperature TcMEAS, then have
Wherein, Y12For the whole Y factor for the two-level concatenation system that measured piece and Noise Factor Analyzer form；F12For measured piece and
The overall noise coefficient of the two-level concatenation system of Noise Factor Analyzer composition；
The gain G of measured piece1It is determined by formula (14)：
According to noise coefficient cascading equations, the noise coefficient F of measured piece1It is determined by formula (15)：
Pass through calibration and measurement error amendment, it will be able to which measurement obtains the gain G of measured piece1With noise coefficient F1Exact value；
Step 3：Correction of temperature drift is calibrated, and is specifically comprised the following steps：
Temperature observation circuit inside Noise Factor Analyzer detects that the temperature change of cabinet inside is more than 5 DEG C, opens first
Dynamic temperature floats calibration function, and calibration switch is switched to calibration port at this time, if noise source is in hot and cold conditions in on-line calibration circuit
When the noise power that measures of Noise Factor Analyzer be respectively N2_ONINTSAnd N2_OFFINTS, noise source in on-line calibration circuit
Excess noise ratio remains unchanged as ENRINT, cold-state temperature TcINT, then have：
Wherein, Y2INTSFor Noise Factor Analyzer internal circuit performance occur temperature drift when using the calibration port of calibration switch as ginseng
Examine the Y factor of the Noise Factor Analyzer complete machine of plane, F2INTSTemperature drift occurs for the performance of Noise Factor Analyzer internal circuit
When using the calibration port of calibration switch as the own ship's noise coefficient of the Noise Factor Analyzer complete machine of reference planes；
According to temperature drift calibration result, noise coefficient analysis is analyzed after temperature drift occurs by the noise coefficient of reference planes of input port
The own ship's noise coefficient of instrument is modified to F2S, shown in value such as equation (18)：
Wherein, F2For in step 1.1 by formula (9) determine using input port as the Noise Factor Analyzer of reference planes
Own ship's noise coefficient；F2INTFor step 1.2 by formula (11) determine using the calibration port of calibration switch as reference planes
Noise Factor Analyzer complete machine own ship's noise coefficient；F2INTSFor the noise coefficient determined in step 3 by formula (17)
Using the calibration port of calibration switch as the Noise Factor Analyzer of reference planes when the performance generation temperature drift of analyzer internal circuit
The own ship's noise coefficient of complete machine；
Step 4：After completing temperature drift calibration, calibration switch is switched to measurement port and carries out measured piece measurement again, if making an uproar at this time
The hot noise power measured with Noise Factor Analyzer under two excitation states of cold conditions of sound source is respectively N12_ONAnd N12_OFF, survey
The excess noise ratio of used noise source is ENR when amountMEAS, cold-state temperature TcMEAS；
According to temperature drift calibration result, the gain G of measured piece is obtained1With noise coefficient F1Formula amendment the following is：
Wherein, N2_ONAnd N2_OFFWhen step 1.1 is calibrated, measurement obtains, ENRCALNoise source is used when being calibrated by step 1.1
Excess noise ratio, N2_ONINTAnd N2_OFFINTWhen carrying out step 1.2 calibration, measurement obtains, N2_ONINTSAnd N2_OFFINSIt is repaiied in step 3 temperature drift
Measurement obtains when positive calibration；
Above in formula, F2SIt is determined by step (3) and formula (18), F12The noise power N measured by step (4)12
_ON、N12_OFFAnd formula (12) and formula (13) determine that G1 is determined by step 4 and formula (19)；
It is automatic to start temperature drift calibration function when Noise Factor Analyzer monitors that the temperature change of cabinet inside is excessive, according to
Temperature drift calibration result calculates the gain G of measured piece using formula (19) and formula (20)1With noise coefficient F1, noise system can be corrected
Number analyzer measurement error caused by temperature drift.
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