CN104634455B - A kind of multichannel radiometer system front end and the control method of its consistency - Google Patents
A kind of multichannel radiometer system front end and the control method of its consistency Download PDFInfo
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Abstract
The invention discloses a kind of multichannel radiometer system front end and the control method of its consistency, multichannel radiometer system front end is made up of in the form of an array several single channel radiometer front ends, single channel radiometer front end includes radio frequency amplification and detection module, video amplifier module, integral adjustment module and differential amplification and reference potential adjustment module, radio frequency amplification is sequentially connected with detection module, video amplifier module, integral adjustment module and differential amplification and reference potential adjustment module, differential amplification and the output end output voltage signal V of reference potential adjustment moduleout.The present invention can efficiently solve the problem of multichannel radiometer system front end is inconsistent, it is not necessary to external perimysium reference reference source and extra circuit structure, have the advantages that small volume, integrated level height, technique are simple.
Description
Technical field
The invention belongs to microwave technical field, and in particular to the control of a kind of multichannel radiometer system front end and its consistency
The design of method processed.
Background technology
Microwave and millimeter wave radiometer is a kind of high sensitive receiver for being used to measure object microwave thermal radiation, is passive type
The main tool of microwave remote sensing.Itself does not launch electromagnetic wave, but is observed the microwave that scene is radiated by passively receiving
Energy detects the characteristic of target, and with very high anti-interference and hiding, the neck such as weapon, military surveillance is hidden searching
Domain has broad application prospects；Meanwhile, microwave and millimeter wave radiometer also has low in energy consumption, small volume, light weight and work steady
Fixed reliable the features such as, it is widely used in the fields such as meteorology, agricultural, geology, marine environmental monitoring.Microwave and millimeter wave radiometer occurs
So far, had been developed that ground (containing ground and boat-carrying platform), space base (containing aircraft, guided missile, balloon platform) and satellite-based (contain and defended
Star, airship, space shuttle platform) the serial microwave and millimeter wave radiometer system based on various carrying platforms.
Radiometer front end is as the important component of radiometer system, and its performance directly affects the index of system.For
For single channel radiometer, radiometer sensitivity is its most important performance indications, and it is defined as when the time of integration is 1 second,
The minimum change for the bright temperature of antenna that microwave radiometer can be detected.For preferable radiometer system：
T in formulasFor system noise temperature, B is predetection bandwidth, BnFor bandwidth after detection, k' is to be determined by radiometer system
The factor, τ is the time of integration.
From formula (1) as can be seen that bandwidth B and time of integration τ be influence radiometer system temperature control it is important because
Element.Simultaneously as constituting the microwave device not ideal component, the discreteness of device, noise coefficient, gain ripple of radiometer system
Dynamic grade is to influence the key factor of radiation meter temperature sensitivity.
For multichannel radiometer system, there are two important performance indications, one is radiation meter temperature sensitivity, it is high
The radiometer front end of sensitivity ensure that the performance of whole radiometer system, can greatly enhance the faint radiation signal of system detectio
Ability；Two be the uniformity of radiometer front passage, and passage is inconsistent will to influence the harmony of whole radiometer system, and will
Have a strong impact on the quality of imaging.At present, domestic microwave radiation meter systems by early stage single channel mechanical scanning structure,
Gradually change to multi-channel parallel Scan Architecture, it is therefore an objective to improve image taking speed, realize the real-time of whole system imaging.More enter
One step, foreign countries realize whole radiometer system using large scale array form, and port number is up to thousands of.By
It cause to have a strong impact in inconsistent can be imaged radiometer system of passage, therefore ensure that the uniformity of multichannel seems particularly heavy
Will.
Multichannel radiometer front passage uniformity includes two aspects：Passage overall gain uniformity and channel temperature spirit
Sensitivity uniformity.Fig. 1 is single channel radiometer system front end block diagram, and its primary structure includes：Radio-frequency module 1 before detection, square
Rate wave detector 2, the video amplifier 3, integrator 4, difference amplifier 5.Single channel radiometer front end output voltage can be represented simply
For：
Vout=(KB (TA+TREC)G·Cd·GV-VREC)·Gd (2)
K is Boltzmann constant in formula, and B is system bandwidth, T before detectionAThe bright temperature of object received for antenna, TRECIt is logical
Road front end equivalent noise temperature, G is radio-frequency module overall gain, C before detectiondSquare law detector voltage sensibility, GVFor regarding
Audio amplifier gain, VRECThe reference voltage level inputted for difference amplifier, GdFor difference amplifier multiplication factor.
From formula (2) as can be seen that wanting to ensure multichannel radiometer front end output voltage VoutIt is consistent and accurate anti-
Reflect the bright temperature T of objectA, to meet following two condition：
(1)K·B·G·Cd·GVIt is consistent；
(2) on the basis of (1), the reference voltage level V for inputting difference amplifierREC=KBTREC·G·Cd·
GV, as reference voltage level is consistent with the magnitude of voltage corresponding to Channel front end equivalent noise temperature, thus obtains formula Vout=
K·B·TA·G·Cd·GV, GdMake G againdIt is consistent, meets both the above condition, it is ensured that multichannel radiometer
Front end output voltage VoutIt is consistent and accurately reflects the bright temperature T of objectA。
Domestic microwave and millimeter wave radiometer front-end module uses hydrid integrated circuit form at present, for each
For passage, the inconsistency in the processing and assembling process of microwave and millimeter wave circuit substrate exists all the time, it is impossible to avoid, each
Jumped in inconsistency in the discreteness that chip is produced in process of production, chip assembling process, especially chip assembling process
The inconsistency of spun gold can not similarly be avoided, and this will cause following both sides inconsistency：
(1) from analysis above, K is equal amount, and examines overall gain G and the spirit of detector voltage of wavefront system
Sensitivity CdNecessarily there is very big difference for different passages, B also has certain difference due to the discreteness of each chip,
Which results in the output voltage V of each passageoutIt is inconsistent；
(2) from being analyzed above, the various inconsistencies in radiometer channel exist all the time, and the discreteness of chip can not also be kept away
Exempt from, influence the factors such as discreteness, noise coefficient, the gain fluctuation of device of system temperature sensitivity for different passages
Also very big difference is had, which results in the temperature control of each passage is inconsistent.Therefore each interchannel is inconsistent
Property will necessarily produce and can not overcome, the inconsistency of passage is embodied in passage output voltage inconsistent, and (i.e. passage totally increases
Benefit is inconsistent) and channel temperature sensitivity two aspects of inconsistency, two kinds of inconsistencies all can be to the property of radiometer system
It can cause to have a strong impact on.Therefore, in the urgent need to a kind of effective control method, on the basis of miniaturization is ensured, it is ensured that lead to more
The uniformity of road radiometer system.
In the prior art, currently for more than multichannel radiometer front passage inconsistence problems using determine calibration method come
Eliminate its influence to image quality.From the correlation theories knowledge of radiometer, radiometer front end output voltage VoutWith object
Radiation brightness TAThere is linear relationship, can simply be expressed as Vout=aTA+ b, a, b are constant, therefore, by two different objects
Bright temperature just can determine that a and b value, and then draw radiometer output voltage VoutWith the bright temperature T of objectALinear representation.It is general fixed
The cold and hot reference source of the accurately known standard of microwave radiation characteristics can be chosen during mark, in order to ensure the degree of accuracy, low-temperature receiver is typically selected
The standard termination selected with liquid nitrogen, thermal source under normal temperature.Different passages is calibrated successively, drawn respectively before different passages
The relational expression between output voltage and the bright temperature of object is held, then increases in radiometer Back end data processing module and different is led to
The compensation deals of road front end output voltage, to avoid influence of the output voltage inconsistency to system imaging quality.
It is above-mentioned eliminated using calibration method is determined its on image quality influence method there are the following problems：
(a) radiometer front end consistency problem is not solved.
Determine calibration method and influence of the output voltage inconsistency to system imaging quality simply avoided in radiometer rear end,
But reality solves the problem of radiometer front end output voltage is inconsistent, and it is sensitive to multichannel radiometer head temperature
Degree is inconsistent also helpless.
(b) frequently calibration is wasted time and energy.
In order to ensure the accuracy of whole radiometer system, frequent calibration is needed for inconsistency, reference source is typically big
And it is thick and heavy, especially liquid nitrogen environment is difficult to obtain easily, and frequently calibration seems and wasted time and energy and uneconomical, and system needs to put sometimes
In unmanned environment, it is impossible to accomplish often calibration, which limits systematic difference scope.
(c) radiometer back end processing module need to be increased.
The complexity of whole radiometer system is added, is unfavorable for the simplification and miniaturization of whole system, is unfavorable for big
The establishment of scale array.
Another solution for multichannel radiometer front passage inconsistence problems is using single in the prior art
Piece integrated circuit, makes low-noise amplifier, square law wave detector, transmission in semiconductor substrate materials (such as Si, GaAs etc.)
Line etc., directly utilization deposit photoetching process and produce complete multichannel radiometer front end system, eliminate human weld, it is to avoid
The inconsistency of each passageway machining, it also avoid the discreteness produced in one single chip production process, with it is very high can
By property, the uniformity of multichannel radiometer front end preferably ensure that.
The method of above-mentioned use monolithic integrated optical circuit Solving Multichannel radiometer front passage inconsistence problems exists as follows
Problem：
(a) technical requirements are high, complex process.
Because technical requirements are higher, the current country there is no the single-chip integration processing technology line of maturation, realize that multichannel is radiated
The singualtion of meter front end system there is no method to realize.
(b) early investment is high, and the cycle is long, is not suitable for small lot batch manufacture.
Single-chip integration processing cost is very high, and early investment is big, and the lead time is long, not for the strong radiometer system of property
System, also without advantage during small lot batch manufacture.
The content of the invention
Ask the invention aims to Solving Multichannel radiometer system front-end gain and temperature control are inconsistent
A kind of topic, it is proposed that the control method of multichannel radiometer system front end and its consistency.
The technical scheme is that：A kind of multichannel radiometer system front end, by several single channel radiometer front ends
Constitute in the form of an array, single channel radiometer front end includes radio frequency amplification and detection module, video amplifier module, integral adjustment mould
Block and differential amplification and reference potential adjustment module, radio frequency amplification and detection module, video amplifier module, integral adjustment module
And differential amplification is sequentially connected with reference potential adjustment module, differential amplification and the output end of reference potential adjustment module are exported
Voltage signal Vout。
Preferably, radio frequency amplification includes radio frequency amplifier section and square law wave detector before detection with detection module；Before detection
The input of radio frequency amplifier section is radio frequency amplification and the input of detection module, and output end is connected to the defeated of square law wave detector
Enter end, the output end of square law wave detector amplifies the output end with detection module for radio frequency.
Preferably, video amplifier module includes operational amplifier, the first adjustable resistor and the second adjustable resistor
Device；The in-phase input end of operational amplifier is the input of video amplifier module, and output end is the output end of video amplifier module,
First adjustable resistor is serially connected between the inverting input of operational amplifier and output end, second adjustable resistor one end
Ground connection, the other end is connected to the inverting input of operational amplifier.
Preferably, integral adjustment module includes the 3rd adjustable resistor and tunable capacitor, the 3rd adjustable resistor
The two ends of device are respectively the input and output end of integral adjustment module, tunable capacitor one end ground connection, the other end and the 3rd
The output end connection of adjustable resistor.
Preferably, differential amplification includes the 4th adjustable resistor, the 5th adjustable resistor with reference potential adjustment module
Device and differential operational amplifier；One input of differential operational amplifier is differential amplification and reference potential adjustment module
Input, output end is differential amplification and the output end of reference potential adjustment module, and the 4th adjustable resistor one end is grounded, and
Connected with the 5th adjustable resistor, one end of the 5th adjustable resistor is connected to another input of differential operational amplifier
End, the reference voltage V being externally supplied is connected between the 4th adjustable resistor and the 5th adjustable resistorREF。
Present invention also offers a kind of control method of multichannel radiometer system front end uniformity, it is characterised in that bag
Include following steps：
S1, any two passage of selection multichannel radiometer system front end, it is another using one of passage as passage 1
Passage is passage n, and two path inputs connect identical matched load respectively；
S2, the video amplifier module adjusted respectively to gain and the requirement of temperature control according to system in passage 1, integration
Adjustment module and differential amplification and reference potential adjustment module；
S3, with adjusted good passage 1 it is standard, the gain of video amplifier module, makes voltage V in regulation passage nn2With leading to
V in road 112Value is equal；
Differential amplification and reference potential adjustment module in S4, regulation passage n, make output voltage VoutnWith being exported in passage 1
Voltage Vout1Value is equal；
Integral adjustment module in S5, regulation passage n, makes passage n temperature control and the temperature control phase of passage 1
Deng；
S6, still with passage 1 it is standard, a passage is selected every time to adjust, repeat step S3-S5, until each logical
Road is all adjusted and finished.
Further, step S2 is specially to adjust the first adjustable resistor in passage 1 in video amplifier module or the
The 3rd adjustable resistor or tunable capacitor in two adjustable resistors, integral adjustment module, and differential amplification with
The 4th adjustable resistor, the 5th adjustable resistor or reference voltage V in reference potential adjustment moduleREF, make passage 1
Gain and temperature control meet system requirements.
Further, step S3 is specifically by the first adjustable resistor in video amplifier module in regulation passage n
Or second adjustable resistor change the gain of video amplifier module, make voltage Vn2With the V in passage 112Value is equal.
Further, step S4 is specifically by the in differential amplification and reference potential adjustment module in regulation passage n
Four adjustable resistors, the 5th adjustable resistor or reference voltage VREF, make output voltage VoutnWith output voltage in passage 1
Vout1Value is equal.
Further, step S5 is specifically by the 3rd adjustable resistor in integral adjustment module in regulation passage n
Or tunable capacitor, i.e., change its temperature control by adjusting passage n time of integration τ=RC, make passage n temperature
Sensitivity is equal with the temperature control of passage 1.
The beneficial effects of the invention are as follows：
(a) the problem of multichannel radiometer system front end is inconsistent can be efficiently solved.
The present invention proposes a kind of control method of multichannel radiometer system front end uniformity, by adjusting video amplifier mould
Block, integral adjustment module and differential amplification and adjustable resistor and tunable capacitor in reference potential adjustment module, energy
Effectively ensure multichannel radiometer system front end uniformity.
(b) external perimysium reference reference source is not needed, and control process is simple and reliable.
From unlike calibrating method, the present invention need not be frequently calibrated multichannel radiometer system front end, eliminated
External equipment is not needed in complicated and expensive reference source, control process, simple and reliable, the limitation without application places.
(c) extra circuit structure is not needed, whole radiometer front end small volume, integrated level is high, is adapted to set up extensive
Array.
Present invention eliminates complicated back end processing module, the complexity of whole system, small volume, integrated level are reduced
Height, is adapted to set up large scale array.
(d) technical requirements are relatively low, and technique is realized easy.
Existing ripe processing technology domestic at present of the invention is supported, is technically realized relative to single-chip integration more simple
It is single.
Brief description of the drawings
Fig. 1 is existing single channel radiometer system front-end architecture block diagram.
Fig. 2 is the single channel radiometer system front-end architecture block diagram of the embodiment of the present invention one.
Fig. 3 is the single channel radiometer system front-end circuit block diagram of the embodiment of the present invention one.
Fig. 4 is the control method flow chart of the multichannel radiometer system front end uniformity of the embodiment of the present invention one.
Fig. 5 controls circuit block diagram for the multichannel radiometer system front end uniformity of the embodiment of the present invention one.
Fig. 6 is the single channel radiometer system front-end circuit block diagram of the embodiment of the present invention two.
Fig. 7 is the single channel radiometer system front-end circuit block diagram of the embodiment of the present invention three.
Description of reference numerals：Radio-frequency module, 2-square law wave detector, 3-video amplifier, 4-integration before 1-detection
Device, 5-difference amplifier, 11-radio frequency amplification with detection module, 12-video amplifier module, 13-integral adjustment module,
14-differential amplification and radio frequency amplifier section, 32-square law wave detector, 33-fortune before reference potential adjustment module, 31-detection
Calculate amplifier, the 34-the first adjustable resistor, the 35-the second adjustable resistor, the 36-the three adjustable resistor, 37-
Tunable capacitor, the 38-the four adjustable resistor, the 39-the five adjustable resistor, 40-differential operational amplifier.
Embodiment
Embodiments of the invention are further described below in conjunction with the accompanying drawings.
Embodiment one：
The embodiments of the invention provide a kind of multichannel radiometer system front end, by several single channel radiometer front ends with
Array format is constituted, and single channel radiometer system front-end architecture is as shown in Fig. 2 including radio frequency amplification and detection module 11, video
Amplification module 12, integral adjustment module 13 and differential amplification and reference potential adjustment module 14, radio frequency amplification and detection module
11st, video amplifier module 12, integral adjustment module 13 and differential amplification and reference potential adjustment module 14 are sequentially connected with, difference
Amplification and the output end output voltage signal V of reference potential adjustment module 14out。
The bright temperature signal power of object radiation is received through antenna enters radio frequency amplification and detection module 11, and signal is carried out
Power amplification and square law detection, obtain faint voltage signal V1, enter back into video amplifier module 12 and be amplified, obtain electricity
Press signal V2, the regulation of gain can be carried out in video amplifier module 12.Voltage signal V2Into integral adjustment module 13, pass through
Change the temperature control that time of integration τ carrys out regulating system, signal after integral adjustment module 13 by obtaining voltage signal V3, then
Into differential amplification and reference potential adjustment module 14, reference voltage regulation and gain-adjusted, reference voltage can be carried out here
The purpose of regulation is to offset radiometer front-end noise, final output voltage Vout。
Single channel radiometer system front-end circuit is as shown in figure 3, wherein radio frequency amplification includes before detection with detection module 11
Radio frequency amplifier section 31 and square law wave detector 32, the input of radio frequency amplifier section 31 is radio frequency amplification and detection mould before detection
The input of block 11, output end is connected to the input of square law wave detector 32, and the output end of square law wave detector 32 is radio frequency
Amplification and the output end of detection module 11.
Video amplifier module 12 includes operational amplifier 33, the first adjustable resistor 34 and the second adjustable resistor
35, the in-phase input end of operational amplifier 33 is the input of video amplifier module 12, and output end is video amplifier module 12
Output end, the first adjustable resistor 34 is serially connected between the inverting input of operational amplifier 33 and output end, and second is adjustable
The one end of resistor 35 ground connection is saved, the other end is connected to the inverting input of operational amplifier 33.
Integral adjustment module 13 includes the 3rd adjustable resistor 36 and tunable capacitor 37, the 3rd adjustable resistor
36 two ends are respectively the input and output end of integral adjustment module 13, the one end of tunable capacitor 37 ground connection, the other end with
The output end of 3rd adjustable resistor 36 is connected.
Differential amplification includes the 4th adjustable resistor 38, the 5th adjustable resistor 39 with reference potential adjustment module 14
And differential operational amplifier 40, an input of differential operational amplifier 40 is differential amplification and reference potential adjustment module
14 input, output end is differential amplification and the output end of reference potential adjustment module 14, the 4th adjustable resistor 38 1
End ground connection, and connected with the 5th adjustable resistor 39, one end of the 5th adjustable resistor 39 is connected to calculus of differences amplification
Another input of device 40, the reference being externally supplied is connected between the 4th adjustable resistor 38 and the 5th adjustable resistor 39
Voltage VREF.Two of differential operational amplifier 40 are serially connected with a resistance respectively between input and output end.Calculus of differences is put
The connection of big device 40 is Differential Input, difference output or Differential Input, Single-end output.
Also include the conventional capacitance and resistance of some this areas in above-mentioned modules, to guarantee to be constituted with remaining part
Complete circuit module.
The embodiment of the present invention additionally provides a kind of control method of multichannel radiometer system front end uniformity, its flow chart
As shown in figure 4, comprising the following steps：
S1, as shown in figure 5, any two passage of selection multichannel radiometer system front end, using one of passage as
Passage 1, another passage is passage n, and two path inputs connect identical matched load (or object of identical bright temperature) respectively,
To ensure the input signal power P of two passagesinIt is equal；
S2, from multichannel radiometer discordance analysis, for identical input power Pin, two passage square laws
Output voltage V after wave detector 3211And Vn1It is unequal；Now gain and the requirement of temperature control are adjusted respectively according to system
Save the first adjustable resistor 34 or the second adjustable resistor 35 in video amplifier module 12, integral adjustment mould in passage 1
In the 3rd adjustable resistor 36 or tunable capacitor 37 in block 13, and differential amplification and reference potential adjustment module 14
The 4th adjustable resistor 38, the 5th adjustable resistor 39 or reference voltage VREF, make gain and the temperature sensitive of passage 1
Degree meets system requirements；
S3, with adjusted good passage 1 it is standard, the first adjustable resistor of video amplifier module 12 in regulation passage n
The adjustable resistor 35 of device 34 or second, changes the gain of video amplifier module 12, makes voltage Vn2With the V in passage 112It is worth phase
Deng；
S4, integral adjustment module 13 will not change system gain, therefore Vn3With Vn2Value is essentially identical；Now adjust passage n
Middle differential amplification and the 4th adjustable resistor 38 in reference potential adjustment module 14, the 5th adjustable resistor 39 or reference
Voltage VREF, make output voltage VoutnWith output voltage V in passage 1out1Value is equal, that is, ensure that the gain of two passages is consistent
Property；
The 3rd adjustable resistor 36 or tunable capacitor 37 in S5, regulation passage n in integral adjustment module 13, lead to
Overregulate passage n time of integration τ=RC to change its temperature control, make passage n temperature control and the temperature of passage 1
Sensitivity is equal, that is, ensure that the uniformity of the temperature control of two passages；
S6, still with passage 1 it is standard, a passage is selected every time to adjust, repeat step S3-S5, until each logical
Road is all adjusted and finished.
Embodiment two：
As shown in fig. 6, by the integral adjustment module 13 and differential amplification in embodiment one and reference potential adjustment module 14
Transposition, radio frequency amplification and detection module 11, video amplifier module 12, differential amplification and reference potential adjustment module 14 and product
Point 13 4 modules of adjustment module are sequentially connected with, last output voltage signal Vout.Difference amplifier is Differential Input herein, single
End output.Its control process is identical with embodiment one.
Embodiment three：
In embodiment one, the control process of multichannel radiometer system front end uniformity is performed manually by, and adds work
Measure, therefore can design automatic control module to complete whole regulation process, such as Fig. 7 institutes on the basis of system compact
Show, the single channel radiometer system front-end view of one of passage is only depicted in figure, if different passage output voltage Vout
Differ, the adjustable economize on electricity of the first adjustable resistor 34 or the second that automatic control module will be just controlled in video amplifier module 12
Hinder device 35, and differential amplification and the 4th adjustable resistor 38 in reference potential adjustment module 14, the 5th adjustable resistor
Device 39 or reference voltage VREF, complete to automatically adjust with this；If different channel temperature sensitivity are different, automatic control module is just
The 3rd adjustable resistor 36 or tunable capacitor 37 that control in integral adjustment module 13 are completed to automatically adjust.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.This area
Those of ordinary skill can make according to these technical inspirations disclosed by the invention various does not depart from the other each of essence of the invention
Plant specific deformation and combine, these deformations and combination are still within the scope of the present invention.
Claims (10)
1. a kind of multichannel radiometer system front end, it is characterised in that by several single channel radiometer front ends in the form of an array
Constitute；The single channel radiometer front end includes radio frequency amplification and detection module (11), video amplifier module (12), integral adjustment
Module (13) and differential amplification and reference potential adjustment module (14)；The radio frequency amplification is put with detection module (11), video
Big module (12), integral adjustment module (13) and differential amplification and reference potential adjustment module (14) are sequentially connected with, and difference is put
Greatly with the output end output voltage signal V of reference potential adjustment module (14)out。
2. multichannel radiometer system front end according to claim 1, it is characterised in that the radio frequency amplification and detection mould
Block (11) includes radio frequency amplifier section (31) and square law wave detector (32) before detection；Radio frequency amplifier section (31) before the detection
Input amplify for radio frequency and be connected to the input of square law wave detector (32) with the input of detection module (11), output end
End；The output end of the square law wave detector (32) is radio frequency amplification and the output end of detection module (11).
3. multichannel radiometer system front end according to claim 1, it is characterised in that the video amplifier module (12)
Including operational amplifier (33), the first adjustable resistor (34) and the second adjustable resistor (35)；The operation amplifier
The in-phase input end of device (33) is the input of video amplifier module (12), and output end is the output of video amplifier module (12)
End；First adjustable resistor (34) is serially connected between the inverting input of operational amplifier (33) and output end；It is described
Second adjustable resistor (35) one end is grounded, and the other end is connected to the inverting input of operational amplifier (33).
4. multichannel radiometer system front end according to claim 1, it is characterised in that the integral adjustment module (13)
Including the 3rd adjustable resistor (36) and tunable capacitor (37)；The two ends difference of 3rd adjustable resistor (36)
For the input and output end of integral adjustment module (13)；Tunable capacitor (37) one end ground connection, the other end and the 3rd
The output end connection of adjustable resistor (36).
5. multichannel radiometer system front end according to claim 1, it is characterised in that the differential amplification and reference electricity
Position adjustment module (14) includes the 4th adjustable resistor (38), the 5th adjustable resistor (39) and differential operational amplifier
(40)；One input of the differential operational amplifier (40) is differential amplification and the input of reference potential adjustment module (14)
End, output end is differential amplification and the output end of reference potential adjustment module (14)；4th adjustable resistor (38) one
End ground connection, and connected with the 5th adjustable resistor (39)；One end of 5th adjustable resistor (39) is connected to difference
Another input of operational amplifier (40)；Between 4th adjustable resistor (38) and the 5th adjustable resistor (39)
It is connected to the reference voltage V being externally suppliedREF。
6. a kind of control method of multichannel radiometer system front end uniformity, it is characterised in that comprise the following steps：
S1, any two passage of selection multichannel radiometer system front end, using one of passage as passage 1, another passage
For passage n, two path inputs connect identical matched load respectively；
S2, the video amplifier module (12) adjusted respectively to gain and the requirement of temperature control according to system in passage 1, integration
Adjustment module (13) and differential amplification and reference potential adjustment module (14)；
S3, with adjusted good passage 1 it is standard, the gain of video amplifier module (12), makes video amplifier mould in regulation passage n
Block (12) output end voltage Vn2With video amplifier module (12) output end voltage V in passage 112Value is equal；
Differential amplification and reference potential adjustment module (14) in S4, regulation passage n, make differential amplification and reference potential adjustment module
(14) output voltage VoutnWith differential amplification in passage 1 and the output voltage V of reference potential adjustment module (14)out1Value is equal；
Integral adjustment module (13) in S5, regulation passage n, makes passage n temperature control and the temperature control phase of passage 1
Deng；
S6, still with passage 1 it is standard, a passage is selected every time to adjust, repeat step S3-S5, until each passage
Regulation is finished.
7. a kind of control method of multichannel radiometer system front end uniformity according to claim 6, it is characterised in that
The step S2 is specially to adjust the first adjustable resistor (34) in passage 1 in video amplifier module (12) or second adjustable
The 3rd adjustable resistor (36) or tunable capacitor (37) in resistor (35), integral adjustment module (13) are saved, and
The 4th adjustable resistor (38), the 5th adjustable resistor (39) in differential amplification and reference potential adjustment module (14) or
Reference voltage VREF, the gain and temperature control for making passage 1 meet system requirements.
8. a kind of control method of multichannel radiometer system front end uniformity according to claim 6, it is characterised in that
The step S3 is specifically by the first adjustable resistor (34) or second in video amplifier module (12) in regulation passage n
Adjustable resistor (35) changes the gain of video amplifier module (12), makes video amplifier module (12) output end voltage Vn2With
Video amplifier module (12) output end voltage V in passage 112Value is equal.
9. a kind of control method of multichannel radiometer system front end uniformity according to claim 6, it is characterised in that
The step S4 is specifically by differential amplification in regulation passage n and the 4th adjustable economize on electricity in reference potential adjustment module (14)
Hinder device (38), the 5th adjustable resistor (39) or reference voltage VREF, make differential amplification and reference potential adjustment module (14)
Output voltage VoutnWith differential amplification in passage 1 and the output voltage V of reference potential adjustment module (14)out1Value is equal.
10. a kind of control method of multichannel radiometer system front end uniformity according to claim 6, its feature exists
The 3rd adjustable resistor (36) in integral adjustment module (13) during, the step S5 is specifically by regulation passage n or
Tunable capacitor (37), i.e., change its temperature control by adjusting passage n time of integration τ=RC, make passage n temperature
Spend sensitivity equal with the temperature control of passage 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073833.5A CN104634455B (en) | 2015-02-12 | 2015-02-12 | A kind of multichannel radiometer system front end and the control method of its consistency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073833.5A CN104634455B (en) | 2015-02-12 | 2015-02-12 | A kind of multichannel radiometer system front end and the control method of its consistency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104634455A CN104634455A (en) | 2015-05-20 |
| CN104634455B true CN104634455B (en) | 2017-07-14 |
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