CN104634455A - Multi-channel radiometer system front end and control method of consistency thereof - Google Patents
Multi-channel radiometer system front end and control method of consistency thereof Download PDFInfo
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Abstract
The invention discloses a multi-channel radiometer system front end and a control method of consistency thereof. The multi-channel radiometer system front end consists of a plurality of single-channel radiometer front ends in an array way, wherein each single-channel radiometer front end comprises a radio frequency amplification and wave detection module, a video amplification module, an integral regulation module and a difference amplification and reference potential regulation module; the radio frequency amplification and wave detection module, the video amplification module, the integral regulation module and the difference amplification and reference potential regulation module are connected in turn; the output end of the difference amplification and reference potential regulation module outputs a voltage signal Vout. According to the multi-channel radiometer system front end, the problem of inconsistent multi-channel radiometer system front ends can be effectively solved, an external standard calibration source and an additional circuit structure are not required, and the multi-channel radiometer system front end has the advantages of small volume, high integration degree and simple technology.
Description
Technical field
The invention belongs to microwave technical field, be specifically related to the design of a kind of hyperchannel radiometer system front end and conforming control method thereof.
Background technology
Microwave and millimeter wave radiometer is a kind of high sensitive receiver for measuring object microwave thermal radiation, is the main tool of passive type microwave remote sensing.Itself is emitting electromagnetic wave not, but by receiving the characteristic that the microwave energy being observed scene radiation carrys out the detection of a target passively, has very high anti-interference and hiding, hides the field such as weapon, military surveillance have broad application prospects in seeking; Meanwhile, microwave and millimeter wave radiometer also has low in energy consumption, the feature such as volume is little, quality is light and working stability is reliable, is widely used in the fields such as meteorology, agricultural, geology, marine environmental monitoring.Microwave and millimeter wave radiometer occurs so far, has developed the serial microwave and millimeter wave radiometer system based on various carrying platform of ground (containing ground and boat-carrying platform), space base (containing aircraft, guided missile, balloon platform) and satellite-based (containing satellite, airship, space shuttle platform).
Radiometer front end as the important component part of radiometer system, the index of the direct influential system of its performance.For single channel radiometer, radiometer sensitivity is its most important performance index, and it is defined as when integral time is 1 second, the minimum change of the bright temperature of the antenna that microwave radiometer can detect.Radiometer system for desirable:
T in formula
sfor system noise temperature, B is predetection bandwidth, B
nfor bandwidth after detection, k' is the factor determined by radiometer system, and τ is integral time.
As can be seen from formula (1), bandwidth B and integral time τ be the key factor affecting radiometer system temperature control.Meanwhile, because the microwave device forming radiometer system is not ideal component, the discreteness, noise figure, gain fluctuation etc. of device are all the key factors affecting radiometer temperature control.
For hyperchannel radiometer system, have the performance index that two important, one is radiometer temperature control, and highly sensitive radiometer front end can ensure the performance of whole radiometer system, greatly can strengthen the ability of the faint radiation signal of systems axiol-ogy; Two is consistance of radiometer front passage, and passage is inconsistent will the harmony of the whole radiometer system of impact, and will have a strong impact on the quality of imaging.At present, domestic microwave meter systems, by the structure of early stage single channel mechanical scanning, changes to multi-channel parallel Scan Architecture gradually, and object improves image taking speed, realizes the real-time of whole system imaging.Further, adopted large scale array form to realize whole radiometer system abroad, port number is up to thousands of.Have a strong impact on because the inconsistent meeting of passage causes radiometer system imaging, therefore ensure that multichannel consistance seems particularly important.
Hyperchannel radiometer front passage consistance comprises two aspects: passage overall gain consistance and channel temperature sensitivity consistance.Fig. 1 is single channel radiometer system front end block diagram, and its primary structure comprises: radio-frequency module 1 before detection, square law wave detector 2, the video amplifier 3, integrator 4, differential amplifier 5.Single channel radiometer front end output voltage can simply be expressed as:
V
out＝(K·B(T
A+T
REC)G·C
d·G
V-V
REC)·G
d(2)
In formula, K is Boltzmann constant, and B is system bandwidth before detection, T
afor the bright temperature of object that antenna receives, T
rECfor Channel front end effective noise temperature, G is radio-frequency module full gain before detection, C
dsquare law detector voltage sensitivity, G
vfor video amplifier gain, V
rECfor the reference voltage level of differential amplifier input, G
dfor differential amplifier enlargement factor.
As can be seen from formula (2), want to ensure hyperchannel radiometer front end output voltage V
outbe consistent and accurately reflect the bright temperature T of object
a, two conditions below be met:
(1) KBGC
dg
vbe consistent;
(2) on the basis of (1), the reference voltage level V that differential amplifier inputs is made
rEC=KBT
rECgC
dg
v, be reference voltage level consistent with the magnitude of voltage corresponding to Channel front end effective noise temperature, so just obtain formula V
out=KBT
agC
dg
v, G
dmake G again
dbe consistent, meet two conditions above, just can ensure hyperchannel radiometer front end output voltage V
outbe consistent and accurately reflect the bright temperature T of object
a.
What microwave and millimeter wave radiometer front-end module domestic at present all adopted is hydrid integrated circuit form, for each passage, inconsistency in the processing of microwave and millimeter wave circuit substrate and assembling process exists all the time, cannot avoid, the discreteness that each chip produces in process of production, the inconsistency of jumping spun gold in the inconsistency in chip assembling process, especially chip assembling process cannot be avoided too, and this will cause the inconsistency of following two aspects:
(1) from analysis above, K is identical amount, and examines full gain G and the detector voltage sensitivity C of wavefront system
dmust have 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 passage
outinconsistent;
(2) from upper surface analysis, the various inconsistency in radiometer channel exists all the time, the discreteness of chip also cannot be avoided, the factor such as discreteness, noise figure, gain fluctuation of the device of influential system temperature control also has very large difference for different passages, and the temperature control which results in each passage is inconsistent.Therefore each interchannel inconsistency will inevitably produce and cannot overcome, the inconsistency of passage is embodied in inconsistent (namely passage overall gain is inconsistent) of passage output voltage and inconsistency two aspects of channel temperature sensitivity, and two kinds of inconsistencies all can cause the performance of radiometer system and have a strong impact on.Therefore, in the urgent need to the effective control method of one, on the basis ensureing miniaturization, ensure the consistance of hyperchannel radiometer system.
In the prior art, calibration method is determined to eliminate its impact on image quality for the many employings of hyperchannel radiometer front passage inconsistence problems at present.From the correlation theories knowledge of radiometer, radiometer front end output voltage V
outtemperature T bright with object radiation
athere is linear relationship, simply can be expressed as V
out=aT
a+ b, a, b are constant, therefore, just can be determined the value of a and b, and then draw radiometer output voltage V by two bright temperature of different objects
outtemperature T bright with object
alinear representation.Can choose the cold and hot reference source of the accurately known standard of microwave radiation characteristics in general calibration process, in order to ensure accuracy, low-temperature receiver generally selects liquid nitrogen, and thermal source selects the standard termination under normal temperature.Successively different passages is calibrated, draw the relational expression between different Channel front end output voltages and the bright temperature of object respectively, then in radiometer Back end data processing module, increase the compensation deals to different Channel front end output voltages, avoid output voltage inconsistency on the impact of system imaging quality.
Calibration method is determined in above-mentioned employing, and to eliminate it, on the method for image quality impact, there are the following problems:
(a) unresolved radiometer front end consistency problem.
Determine calibration method and just avoid the impact of output voltage inconsistency on system imaging quality in radiometer rear end, but the problem that actual solution radiometer front end output voltage is inconsistent, and inconsistent also helpless to the sensitivity of hyperchannel radiometer head temperature.
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 generally large and thick and heavy, especially liquid nitrogen environment is difficult to obtain easily, frequent calibration seems and to waste time and energy and uneconomical, sometimes system needs to be placed on unmanned environment, cannot accomplish frequent calibration, which limits systematic difference scope.
C () need increase radiometer back end processing module.
Add the complexity of whole radiometer system, be unfavorable for simplification and the miniaturization of whole system, be unfavorable for the establishment of large scale array.
In prior art for the another kind of solution of hyperchannel radiometer front passage inconsistence problems be adopt monolithic integrated optical circuit, in semiconductor substrate materials (as Si, GaAs etc.) on make low noise amplifier, square law wave detector, transmission line etc., deposit photoetching process is directly utilized to produce complete hyperchannel radiometer front end system, eliminate human weld, avoid the inconsistency of each passageway machining, it also avoid the discreteness produced in one single chip production run, there is very high reliability, ensure that the consistance of hyperchannel radiometer front end preferably.
There are the following problems for the method for above-mentioned employing monolithic integrated optical circuit Solving Multichannel radiometer front passage inconsistence problems:
A () technical requirement is high, complex process.
Because technical requirement is higher, the domestic single-chip integration processing technology line that there is no maturation at present, the singualtion realizing hyperchannel radiometer front end system there is no method and realizes.
B () early investment is high, the cycle is long, is not suitable for small serial production.
Single-chip integration processing cost is very high, and early investment is large, and the lead time is long, is not suitable for radiometer system with strong points, does not also have advantage during small serial production.
Summary of the invention
The object of the invention is, in order to Solving Multichannel radiometer system front-end gain and the inconsistent problem of temperature control, to propose a kind of hyperchannel radiometer system front end and conforming control method thereof.
Technical scheme of the present invention is: a kind of hyperchannel radiometer system front end, be made up of in the form of an array several single channel radiometer front ends, single channel radiometer front end comprises radio frequency and amplifies and detection module, video amplifier module, integral adjustment module and differential amplification and reference potential adjustment module, radio frequency amplification is connected with reference potential adjustment module in turn with detection module, video amplifier module, integral adjustment module and differential amplification, the output terminal output voltage signal V of differential amplification and reference potential adjustment module
out.
Preferably, radio frequency amplifies and comprises radio frequency amplifier section and square law wave detector before detection with detection module; Before detection, the input end of radio frequency amplifier section is that radio frequency amplifies the input end with detection module, and output terminal is connected to the input end of square law wave detector, and the output terminal of square law wave detector is that radio frequency amplifies the output terminal with detection module.
Preferably, video amplifier module comprises operational amplifier, the first adjustable resistor and the second adjustable resistor; The in-phase input end of operational amplifier is the input end of video amplifier module, output terminal is the output terminal of video amplifier module, first adjustable resistor is serially connected with between the inverting input of operational amplifier and output terminal, second adjustable resistor one end ground connection, the other end is connected to the inverting input of operational amplifier.
Preferably, integral adjustment module comprises the 3rd adjustable resistor and tunable capacitor, the two ends of the 3rd adjustable resistor are respectively input end and the output terminal of integral adjustment module, and tunable capacitor one end ground connection, the other end is connected with the output terminal of the 3rd adjustable resistor.
Preferably, differential amplification and reference potential adjustment module comprise the 4th adjustable resistor, the 5th adjustable resistor and differential operational amplifier; An input end of differential operational amplifier is the input end of differential amplification and reference potential adjustment module, output terminal is the output terminal of differential amplification and reference potential adjustment module, 4th adjustable resistor one end ground connection, and connect with the 5th adjustable resistor, one end of 5th adjustable resistor is connected to another input end of differential operational amplifier, is connected to the outside reference voltage V supplied between the 4th adjustable resistor and the 5th adjustable resistor
rEF.
Present invention also offers the conforming control method in a kind of hyperchannel radiometer system front end, it is characterized in that, comprise the following steps:
Any two passages of S1, selection hyperchannel radiometer system front end, with one of them passage for passage 1, another passage is passage n, and two path input connect identical matched load respectively;
S2, regulate video amplifier module, integral adjustment module and differential amplification in passage 1 and reference potential adjustment module respectively according to the requirement of system to gain and temperature control;
S3, with adjusted good passage 1 for standard, regulate the gain of video amplifier module in passage n, make voltage V
n2with the V in passage 1
12be worth equal;
Differential amplification and reference potential adjustment module in S4, adjustment passage n, make output voltage V
outnwith output voltage V in passage 1
out1be worth equal;
Integral adjustment module in S5, adjustment passage n, makes the temperature control of passage n equal with the temperature control of passage 1;
S6, still with passage 1 for standard, each selected passage regulates, and repeats step S3-S5, until each passage regulates complete.
Further, step S2 is specially and regulates the first adjustable resistor in passage 1 in video amplifier module or the second adjustable resistor, the 3rd adjustable resistor or tunable capacitor in integral adjustment module, and the 4th adjustable resistor, the 5th adjustable resistor or the reference voltage V in differential amplification and reference potential adjustment module
rEF, make the gain of passage 1 and temperature control meet system requirements.
Further, step S3 changes the gain of video amplifier module specifically by the first adjustable resistor regulated in passage n in video amplifier module or the second adjustable resistor, makes voltage V
n2with the V in passage 1
12be worth equal.
Further, step S4 is specifically by the 4th adjustable resistor, the 5th adjustable resistor or the reference voltage V in differential amplification in adjustment passage n and reference potential adjustment module
rEF, make output voltage V
outnwith output voltage V in passage 1
out1be worth equal.
Further, step S5 is specifically by the 3rd adjustable resistor or the tunable capacitor regulated in passage n in integral adjustment module, namely by regulating τ=RC integral time of passage n to change its temperature control, make the temperature control of passage n equal with the temperature control of passage 1.
The invention has the beneficial effects as follows:
A () can Solving Multichannel radiometer system front end is inconsistent effectively problem.
The present invention proposes the conforming control method in a kind of hyperchannel radiometer system front end, by the adjustable resistor in adjustment video amplifier module, integral adjustment module and differential amplification and reference potential adjustment module and tunable capacitor, hyperchannel radiometer system front end consistance effectively can be ensured.
B () does not need external perimysium reference reference source, and control procedure is simple and reliable.
With calibrating method unlike, the present invention does not need frequently to calibrate hyperchannel radiometer system front end, eliminates complexity and the reference source of costliness, does not need external unit in control procedure, simple and reliable, does not have the restriction of application places.
C () does not need extra circuit structure, whole radiometer front end volume is little, and integrated level is high, is applicable to setting up large scale array.
Present invention eliminates complicated back end processing module, reduce the complexity of whole system, volume is little, and integrated level is high, is applicable to setting up large scale array.
D () technical requirement is relatively low, technique realizes easily.
The processing technology support of the current domestic existing maturation of the present invention, technically realizes comparatively simple relative to single-chip integration.
Accompanying drawing explanation
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 conforming control method process flow diagram in hyperchannel radiometer system front end of the embodiment of the present invention one.
Fig. 5 is the hyperchannel radiometer system front end consistance control circuit block diagram 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 before 1-detection, 2-square law wave detector, 3-video amplifier, 4-integrator, 5-differential amplifier, 11-radio frequency amplifies and detection module, 12-video amplifier module, 13-integral adjustment module, 14-differential amplification and reference potential adjustment module, radio frequency amplifier section before 31-detection, 32-square law wave detector, 33-operational amplifier, 34-the first adjustable resistor, 35-the second adjustable resistor, 36-the three adjustable resistor, 37-tunable capacitor, 38-the four adjustable resistor, 39-the five adjustable resistor, 40-differential operational amplifier.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described.
Embodiment one:
Embodiments provide a kind of hyperchannel radiometer system front end, be made up of in the form of an array several single channel radiometer front ends, single channel radiometer system front-end architecture as shown in Figure 2, comprise radio frequency to amplify and detection module 11, video amplifier module 12, integral adjustment module 13 and differential amplification and reference potential adjustment module 14, radio frequency amplifies and detection module 11, video amplifier module 12, integral adjustment module 13 and differential amplification are connected in turn with reference potential adjustment module 14, the output terminal output voltage signal V of differential amplification and reference potential adjustment module 14
out.
The bright temperature signal power of object radiation receives through antenna and enters into radio frequency amplification and detection module 11, carries out power amplification and square law detection, obtain faint voltage signal V to signal
1, then enter video amplifier module 12 and amplify, obtain voltage signal V
2, the adjustment of gain can be carried out in video amplifier module 12.Voltage signal V
2enter integral adjustment module 13, carried out the temperature control of regulating system by change τ integral time, signal is by obtaining voltage signal V after integral adjustment module 13
3, then enter differential amplification and reference potential adjustment module 14, can carry out reference voltage adjustment and gain-adjusted herein, the object that reference voltage regulates offsets radiometer front-end noise, final output voltage V
out.
Single channel radiometer system front-end circuit as shown in Figure 3, wherein radio frequency amplifies and comprises radio frequency amplifier section 31 and square law wave detector 32 before detection with detection module 11, before detection, the input end of radio frequency amplifier section 31 is that radio frequency amplifies the input end with detection module 11, output terminal is connected to the input end of square law wave detector 32, and the output terminal of square law wave detector 32 is that radio frequency amplifies the output terminal with detection module 11.
Video amplifier module 12 comprises operational amplifier 33, first adjustable resistor 34 and the second adjustable resistor 35, the in-phase input end of operational amplifier 33 is the input end of video amplifier module 12, output terminal is the output terminal of video amplifier module 12, between the inverting input that first adjustable resistor 34 is serially connected with operational amplifier 33 and output terminal, second adjustable resistor 35 one end ground connection, the other end is connected to the inverting input of operational amplifier 33.
Integral adjustment module 13 comprises the 3rd adjustable resistor 36 and tunable capacitor 37, the two ends of the 3rd adjustable resistor 36 are respectively input end and the output terminal of integral adjustment module 13, tunable capacitor 37 one end ground connection, the other end is connected with the output terminal of the 3rd adjustable resistor 36.
Differential amplification and reference potential adjustment module 14 comprise the 4th adjustable resistor 38, 5th adjustable resistor 39 and differential operational amplifier 40, an input end of differential operational amplifier 40 is the input end of differential amplification and reference potential adjustment module 14, output terminal is the output terminal of differential amplification and reference potential adjustment module 14, 4th adjustable resistor 38 one end ground connection, and connect with the 5th adjustable resistor 39, one end of 5th adjustable resistor 39 is connected to another input end of differential operational amplifier 40, the outside reference voltage V supplied is connected between 4th adjustable resistor 38 and the 5th adjustable resistor 39
rEF.Two of differential operational amplifier 40 are serially connected with a resistance respectively between input end and output terminal.The connection of differential operational amplifier 40 is Differential Input, difference output or Differential Input, Single-end output.
Conventional capacitance and the resistance of some this areas is also comprised, to guarantee to be formed complete circuit module with remaining part in above-mentioned modules.
The embodiment of the present invention additionally provides the conforming control method in a kind of hyperchannel radiometer system front end, and its process flow diagram as shown in Figure 4, comprises the following steps:
S1, as shown in Figure 5, select any two passages of hyperchannel radiometer system front end, with one of them passage for passage 1, another passage is passage n, two path input connect identical matched load (or object of identical bright temperature), respectively to ensure the input signal power P of two passages
inequal;
S2, from hyperchannel radiometer discordance analysis, for identical power input P
in, the output voltage V after two passage square law wave detectors 32
11and V
n1unequal; Now regulate the first adjustable resistor 34 or the second adjustable resistor 35 in passage 1 in video amplifier module 12 respectively according to the requirement of system to gain and temperature control, the 3rd adjustable resistor 36 in integral adjustment module 13 or tunable capacitor 37, and the 4th adjustable resistor 38, the 5th adjustable resistor 39 or the reference voltage V in differential amplification and reference potential adjustment module 14
rEF, make the gain of passage 1 and temperature control meet system requirements;
S3, with adjusted good passage 1 for standard, regulate the first adjustable resistor 34 or the second adjustable resistor 35 of video amplifier module 12 in passage n, change the gain of video amplifier module 12, make voltage V
n2with the V in passage 1
12be worth equal;
S4, integral adjustment module 13 can not change system-gain, therefore V
n3with V
n2be worth substantially identical; Now regulate the 4th adjustable resistor 38, the 5th adjustable resistor 39 or reference voltage V in differential amplification and reference potential adjustment module 14 in passage n
rEF, make output voltage V
outnwith output voltage V in passage 1
out1be worth equal, namely ensure that the gain consistance of two passages;
The 3rd adjustable resistor 36 in S5, adjustment passage n in integral adjustment module 13 or tunable capacitor 37, its temperature control is changed by regulating τ=RC integral time of passage n, make the temperature control of passage n equal with the temperature control of passage 1, namely ensure that the consistance of the temperature control of two passages;
S6, still with passage 1 for standard, each selected passage regulates, and repeats step S3-S5, until each passage regulates complete.
Embodiment two:
As shown in Figure 6, by the integral adjustment module 13 in embodiment one and differential amplification and reference potential adjustment module 14 transposition, radio frequency amplification is connected with reference potential adjustment module 14 and integral adjustment module 13 4 modules in turn with detection module 11, video amplifier module 12, differential amplification, last output voltage signal V
out.Differential amplifier is Differential Input herein, Single-end output.Its control procedure is identical with embodiment one.
Embodiment three:
In embodiment one, the conforming control procedure in hyperchannel radiometer system front end is manually carried out, add workload, therefore can on the basis of system compact, design automatic control module completes whole adjustment process, as shown in Figure 7, in figure, only depict the single channel radiometer system front-end view of one of them passage, if different passage output voltage V
outnot identical, automatic control module just will control the first adjustable resistor 34 or the second adjustable resistor 35 in video amplifier module 12, and the 4th adjustable resistor 38, the 5th adjustable resistor 39 or the reference voltage V in differential amplification and reference potential adjustment module 14
rEF, complete automatic adjustment with this; If different channel temperature sensitivity is different, the 3rd adjustable resistor 36 controlled in integral adjustment module 13 or tunable capacitor 37 are just completed automatic adjustment by automatic control module.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (10)
1. a hyperchannel radiometer system front end, is characterized in that, is made up of in the form of an array several single channel radiometer front ends; Described single channel radiometer front end comprises radio frequency and amplifies and detection module (11), video amplifier module (12), integral adjustment module (13) and differential amplification and reference potential adjustment module (14); Described radio frequency amplification is connected with reference potential adjustment module (14) in turn with detection module (11), video amplifier module (12), integral adjustment module (13) and differential amplification, the output terminal output voltage signal V of differential amplification and reference potential adjustment module (14)
out.
2. hyperchannel radiometer system front end according to claim 1, is characterized in that, described radio frequency amplifies and to comprise radio frequency amplifier section (31) and square law wave detector (32) before detection with detection module (11); Before described detection, the input end of radio frequency amplifier section (31) is that radio frequency amplifies the input end with detection module (11), and output terminal is connected to the input end of square law wave detector (32); The output terminal of described square law wave detector (32) is that radio frequency amplifies the output terminal with detection module (11).
3. hyperchannel radiometer system front end according to claim 1, it is characterized in that, described video amplifier module (12) comprises operational amplifier (33), the first adjustable resistor (34) and the second adjustable resistor (35); The in-phase input end of described operational amplifier (33) is the input end of video amplifier module (12), and output terminal is the output terminal of video amplifier module (12); Between the inverting input that described first adjustable resistor (34) is serially connected with operational amplifier (33) and output terminal; Described second adjustable resistor (35) one end ground connection, the other end is connected to the inverting input of operational amplifier (33).
4. hyperchannel radiometer system front end according to claim 1, is characterized in that, described integral adjustment module (13) comprises the 3rd adjustable resistor (36) and tunable capacitor (37); The two ends of described 3rd adjustable resistor (36) are respectively input end and the output terminal of integral adjustment module (13); Described tunable capacitor (37) one end ground connection, the other end is connected with the output terminal of the 3rd adjustable resistor (36).
5. hyperchannel radiometer system front end according to claim 1, it is characterized in that, described differential amplification and reference potential adjustment module (14) comprise the 4th adjustable resistor (38), the 5th adjustable resistor (39) and differential operational amplifier (40); An input end of described differential operational amplifier (40) is the input end of differential amplification and reference potential adjustment module (14), and output terminal is the output terminal of differential amplification and reference potential adjustment module (14); Described 4th adjustable resistor (38) one end ground connection, and connect with the 5th adjustable resistor (39); One end of described 5th adjustable resistor (39) is connected to another input end of differential operational amplifier (40); The outside reference voltage V supplied is connected between described 4th adjustable resistor (38) and the 5th adjustable resistor (39)
rEF.
6. the conforming control method in hyperchannel radiometer system front end, is characterized in that, comprise the following steps:
Any two passages of S1, selection hyperchannel radiometer system front end, with one of them passage for passage 1, another passage is passage n, and two path input connect identical matched load respectively;
S2, regulate video amplifier module (12), integral adjustment module (13) and differential amplification in passage 1 and reference potential adjustment module (14) respectively according to the requirement of system to gain and temperature control;
S3, with adjusted good passage 1 for standard, regulate the gain of video amplifier module (12) in passage n, make voltage V
n2with the V in passage 1
12be worth equal;
Differential amplification and reference potential adjustment module (14) in S4, adjustment passage n, make output voltage V
outnwith output voltage V in passage 1
out1be worth equal;
Integral adjustment module (13) in S5, adjustment passage n, makes the temperature control of passage n equal with the temperature control of passage 1;
S6, still with passage 1 for standard, each selected passage regulates, and repeats step S3-S5, until each passage regulates complete.
7. the conforming control method in a kind of hyperchannel radiometer system front end according to claim 6, it is characterized in that, described step S2 is specially and regulates the first adjustable resistor (34) in passage 1 in video amplifier module (12) or the second adjustable resistor (35), the 3rd adjustable resistor (36) in integral adjustment module (13) or tunable capacitor (37), and the 4th adjustable resistor (38) in differential amplification and reference potential adjustment module (14), 5th adjustable resistor (39) or reference voltage V
rEF, make the gain of passage 1 and temperature control meet system requirements.
8. the conforming control method in a kind of hyperchannel radiometer system front end according to claim 6, it is characterized in that, described step S3 changes the gain of video amplifier module (12) specifically by the first adjustable resistor (34) regulated in passage n in video amplifier module (12) or the second adjustable resistor (35), makes voltage V
n2with the V in passage 1
12be worth equal.
9. the conforming control method in a kind of hyperchannel radiometer system front end according to claim 6, it is characterized in that, described step S4 is specifically by the 4th adjustable resistor (38), the 5th adjustable resistor (39) or the reference voltage V in differential amplification in adjustment passage n and reference potential adjustment module (14)
rEF, make output voltage V
outnwith output voltage V in passage 1
out1be worth equal.
10. the conforming control method in a kind of hyperchannel radiometer system front end according to claim 6, it is characterized in that, described step S5 is specifically by the 3rd adjustable resistor (36) regulated in passage n in integral adjustment module (13) or tunable capacitor (37), namely by regulating τ=RC integral time of passage n to change its temperature control, make the temperature control of passage n equal with the temperature control of passage 1.
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| CN105444879A (en) * | 2015-12-16 | 2016-03-30 | 天津津芯微电子科技有限公司 | Laser energy acquisition method and laser energy acquisition device |
| CN110220925A (en) * | 2019-06-11 | 2019-09-10 | 中国电子科技集团公司第十三研究所 | Radiometer front-end architecture |
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| CN104634455B (en) | 2017-07-14 |
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