CN201166689Y - High precision microwave radiometer - Google Patents
High precision microwave radiometer Download PDFInfo
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- CN201166689Y CN201166689Y CNU2008200654509U CN200820065450U CN201166689Y CN 201166689 Y CN201166689 Y CN 201166689Y CN U2008200654509 U CNU2008200654509 U CN U2008200654509U CN 200820065450 U CN200820065450 U CN 200820065450U CN 201166689 Y CN201166689 Y CN 201166689Y
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- radiometer
- dicke
- controlled oscillator
- voltage controlled
- microwave
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Abstract
The utility model relates to a high-precision microwave radiometer which is composed of a Dicke radiometer and an impulsive noise injection system, wherein, the impulsive noise injection system is composed of a feedback amplifier, a voltage controlled oscillator, a pulse shaper, a noise source, an antenna and a coupler; the antenna is connected with the monopole double-throw switch of the Dicke radiometer through the coupler; and the other end of the receiver of the Dicke radiometer is connected with the feedback amplifier, the voltage controlled oscillator, the pulse shaper, the noise source and the coupler sequentially to form a loop. The high-precision microwave radiometer eliminates a microwave switch, a frequency meter and a recorder, thereby lowering the cost and having simple circuit and better performance. The high-precision microwave radiometer is adopted to measure the microwave radiation characteristics of different ground objects, and the stability is smaller than 1 K, thereby satisfying the demand of accurate measurement. The high-precision microwave radiometer has good effects on measuring the sea surface oil slick pollution and the sea surface temperature distribution by adopting airborne marine remote sensing as well as on measuring the salt content of sea water and other parameters by adopting shipborne marine remote sensing.
Description
Technical field
The utility model belongs to electronics and message area, relates to a kind of high precision microwave radiometer.
Background technology
Microwave radiometer is the high sensitivity microwave receiver of energy measurement low level microwave radiation.It guides in remote sensing, environmental monitoring, and a lot of fields such as medical diagnosis all have broad application prospects.Yet,, very high requirement has been proposed for the long-time stability of equipment because the measured signal level is extremely low.Up to the present, only in satellite remote sensing by the cold empty radiation of 2.7K and the heat load radiation about 300K, carry out cycle calibration, solved the long-time stability of microwave radiometer, just obtained reliable application.No. 4 airships in Divine Land of China and Chang'e 1 circumlunar satellite, the U.S. on a series of artificial satellites of European Space Agency and Russia's emission, all is mounted with various types of microwave radiometers.
But the microwave radiometer of ground and airborne application owing to can not find cold temperature source and other cold temperature source that can conveniently use of 2.7K, can't carry out the cycle calibration, and the long-time stability of radiometer are still unresolved, cause its application to be restricted.For many years, people start with from the structure and the signal processing method of radiometer, have proposed a series of schemes, but practical function is all undesirable.
Studies show that: the instability of microwave radiometer, mainly from the instability of radiometer gain, in order to eliminate the influence of gain fluctuation, people such as Hardy have just proposed the zero balancing scheme in the seventies in last century, but because its complex structure does not obtain promoting always.The electric frame of people's such as Hardy radiometer scheme as shown in Figure 1.
Summary of the invention
The purpose of this utility model is in order to overcome the problems referred to above and the shortcoming that prior art exists, and a kind of high precision microwave radiometer is provided, and of the present utility model simple in structure, cost is low, and dependable performance is good through effect.
The technical solution of the utility model is:
The high precision microwave radiometer, by Dicke's radiometer, impulsive noise injected system two parts are formed, Dicke's radiometer is by receiver, single-pole double-throw switch (SPDT) and parametric amplifier load are formed, receiver links to each other with single-pole double-throw switch (SPDT) respectively with the parametric amplifier load, the impulsive noise injected system is by feedback amplifier, voltage controlled oscillator and waveform shaper, noise source, antenna and coupling mechanism, antenna links to each other with the single-pole double-throw switch (SPDT) of Dicke's radiometer through coupling mechanism, the receiver other end of Dicke's radiometer successively with feedback amplifier, voltage controlled oscillator and waveform shaper, noise source and coupling mechanism are connected to the loop.
The circuit of the impulsive noise injected system of microwave radiometer is: the homophase integrating amplifier of being made up of operational amplifier is feedback amplifier just, the output terminal of operational amplifier is connected with the input end of voltage controlled oscillator through resistance, the input end of operational amplifier is connected with the output terminal of Dicke's radiometer, the output terminal of voltage controlled oscillator is connected with the waveform shaper input end, the output terminal of shape reshaper is connected with the input end of noise source, and the output terminal and the coupling mechanism of noise source are connected to the loop.
Comparison diagram 1 and Fig. 2 decreased microwave switch, frequency meter and register in the circuit block diagram that the utility model adopts, thereby cost are low as can be seen, and the simple performance of circuit is better.Adopt the microwave radiometer of the utility model development, for measuring the microwave radiation characteristics of different atural objects, degree of stability satisfies the requirement of precision measurement less than 1K.In addition, the utility model is polluted as airborne ocean remote sensing survey slick and the sea-surface temperature (SST) distribution, the utility model is used for the boat-carrying ocean remote sensing measures seawater salt content and other parameter, all obtained good effect.
Description of drawings
Fig. 1 is that existing radiometer connects block diagram.
Fig. 2 connection block diagram of the present utility model.
Fig. 3 is the circuit diagram of radiometer impulsive noise injected system of the present utility model.
Embodiment
The utility model will be further described in conjunction with the accompanying drawings.
Fig. 2 shows that the utility model is made up of Dicke's radiometer, impulsive noise injected system two parts, and dashed rectangle is a Dicke's radiometer among the figure, and other parts are the impulsive noise injected system.Though Fig. 2 has only decreased several parts than Fig. 1, remove the existing special circuit commodity of Dicke's radiometer, directly to buy, the circuit of impulsive noise injected system is all developed voluntarily, and the utility model is only narrated the circuit and the principle of impulsive noise injected system.
Fig. 3 is the circuit diagram of the impulsive noise injected system of the utility model employing, and its principle of work is down:
According to the principle of work of Dicke's radiometer, the difference TB-TA of signal temperature T B that it can make signal temperature T A that antenna receives and parameter load output is after receiver amplifies and convert voltage to and exist
Point output, its expression way is:
VA＝G(TB-TA)
G is a receiver gain in the formula.Owing to be to have taked constant temperature measures, it is constant that TB can think.So VA is relevant with measured signal TA.If G stablizes constant, then the VA by recording can calculate the size of measured signal VA.If but the G instability then causes VA also can be subjected to the influence of G, this is that we are undesirable.It is problem to be solved in the utility model.
After VA entered the impulsive noise injected system of Fig. 3, at first the homophase integrating amplifier of forming through 741 operational amplifiers caused at its output terminal
The promising characteristic down of the electric VB of point.Then VA is for just for TB＞TA, and VB does not stop to rise, and then VA will be for negative as TB＜TA, and VB does not stop and falls, and has only that VB just can remain unchanged when TB=TA.Native system is at the initial period of opening power, because the TB design is higher, makes TB＞TA so VB will constantly rise.This VB enters voltage controlled oscillator and the square wave reshaper of being made up of LM331 and CDL4098 among Fig. 3, leads making
The repetition frequency of the square-wave pulse of some output will constantly become big.This square-wave pulse is sent into the arteries and veins constant current source of being made up of 3DK32 and SC1008, and the frequency of the impulsive noise of noise source output is constantly increased, and causes the mean noise temperature TC of its output constantly to increase.Behind the coupling mechanism of TC in Fig. 3, its a part of TC will cause the difference of TB and TA+TC to diminish gradually with the TA addition, and this will further cause VA to diminish, and the speed that VB rises becomes overflows, and the speed that the VC pulsed frequency increases is slack-off.The speed that TC increases is slack-off, in case TA+TC=TB is the above VA=0 then, then VB remains unchanged, and uses as tested amount output.Owing to certain TA+TC＞TB, then VA is for negative for this reason, and VB will descend, its process also can lead at last that with last opposite VA=0, VB are maintained on certain specific numerical value, and as tested output quantity, in this state, TA+TC=TB is TA+TC-TB=0, the input signal of Dick's receiver is zero, its output VA also is zero, so no matter why the gain G of system changes all can not influence output quantity VB, get rid of the influence that system-gain changes fully, thereby improved the stability of system greatly.
Claims (2)
1, the high precision microwave radiometer, by Dicke's radiometer, impulsive noise injected system two parts are formed, Dicke's radiometer is by receiver, single-pole double-throw switch (SPDT) and parametric amplifier load are formed, receiver links to each other with single-pole double-throw switch (SPDT) respectively with the parametric amplifier load, the impulsive noise injected system is by feedback amplifier, voltage controlled oscillator and waveform shaper, noise source, antenna and coupling mechanism, it is characterized in that: antenna links to each other with the single-pole double-throw switch (SPDT) of Dicke's radiometer through coupling mechanism, the receiver other end of Dicke's radiometer successively with feedback amplifier, voltage controlled oscillator and waveform shaper, noise source and coupling mechanism are connected to the loop.
2, high precision microwave radiometer according to claim 1, it is characterized in that: the circuit of the impulsive noise injected system of microwave radiometer is: the homophase integrating amplifier of being made up of operational amplifier is feedback amplifier just, the output terminal of operational amplifier is connected with the input end of voltage controlled oscillator through resistance, the input end of operational amplifier is connected with the output terminal of Dicke's radiometer, the output terminal of voltage controlled oscillator is connected with the waveform shaper input end, the output terminal of shape reshaper is connected with the input end of noise source, and the output terminal and the coupling mechanism of noise source are connected to the loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200654509U CN201166689Y (en) | 2008-01-24 | 2008-01-24 | High precision microwave radiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200654509U CN201166689Y (en) | 2008-01-24 | 2008-01-24 | High precision microwave radiometer |
Publications (1)
| Publication Number | Publication Date |
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| CN201166689Y true CN201166689Y (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200654509U Expired - Lifetime CN201166689Y (en) | 2008-01-24 | 2008-01-24 | High precision microwave radiometer |
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| CN (1) | CN201166689Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221337A (en) * | 2011-03-23 | 2011-10-19 | 大连海事大学 | Oil film thickness inversion device of ship borne microwave scatterometer |
| CN101807932B (en) * | 2010-02-01 | 2013-08-21 | 南京紫淮矿用电子高科技有限公司 | Three-terminal modulator for low-frequency modulation type radiometer receiver |
| CN103560801A (en) * | 2013-11-11 | 2014-02-05 | 上海航天测控通信研究所 | Satellite-bone low-noise 13-channel V wave band receiver |
| CN103636120A (en) * | 2011-06-28 | 2014-03-12 | 高通股份有限公司 | Amplifier with improved noise reduction |
| RU2636790C1 (en) * | 2016-06-10 | 2017-11-28 | ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ КАЗЕННОЕ ВОЕННОЕ ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ ВЫСШЕГО ОБРАЗОВАНИЯ "Военная академия Ракетных войск стратегического назначения имени Петра Великого" МИНИСТЕРСТВА ОБОРОНЫ РОССИЙСКОЙ ФЕДЕРАЦИИ | Microwave radiation field indicator with possibility of signal type recognition |
| CN108024728A (en) * | 2015-12-22 | 2018-05-11 | Rtm诊断股份有限公司 | Microwave radiometer |
| CN110231669A (en) * | 2019-06-03 | 2019-09-13 | 杭州浅海科技有限责任公司 | A kind of the ground radiometer and its calibrating method of real-time calibration |
| CN110261934A (en) * | 2019-07-18 | 2019-09-20 | 常州感通威视微波科技有限公司 | Ground-Based Microwave Radiometer system and its calibrating method |
-
2008
- 2008-01-24 CN CNU2008200654509U patent/CN201166689Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807932B (en) * | 2010-02-01 | 2013-08-21 | 南京紫淮矿用电子高科技有限公司 | Three-terminal modulator for low-frequency modulation type radiometer receiver |
| CN102221337A (en) * | 2011-03-23 | 2011-10-19 | 大连海事大学 | Oil film thickness inversion device of ship borne microwave scatterometer |
| CN102221337B (en) * | 2011-03-23 | 2012-07-04 | 大连海事大学 | Oil film thickness inversion device of ship borne microwave scatterometer |
| CN103636120A (en) * | 2011-06-28 | 2014-03-12 | 高通股份有限公司 | Amplifier with improved noise reduction |
| CN103636120B (en) * | 2011-06-28 | 2017-06-27 | 高通股份有限公司 | For the method and apparatus that amplifier noise is reduced |
| CN103560801A (en) * | 2013-11-11 | 2014-02-05 | 上海航天测控通信研究所 | Satellite-bone low-noise 13-channel V wave band receiver |
| CN108024728A (en) * | 2015-12-22 | 2018-05-11 | Rtm诊断股份有限公司 | Microwave radiometer |
| CN108024728B (en) * | 2015-12-22 | 2021-02-05 | Rtm诊断股份有限公司 | Microwave radiometer |
| RU2636790C1 (en) * | 2016-06-10 | 2017-11-28 | ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ КАЗЕННОЕ ВОЕННОЕ ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ ВЫСШЕГО ОБРАЗОВАНИЯ "Военная академия Ракетных войск стратегического назначения имени Петра Великого" МИНИСТЕРСТВА ОБОРОНЫ РОССИЙСКОЙ ФЕДЕРАЦИИ | Microwave radiation field indicator with possibility of signal type recognition |
| CN110231669A (en) * | 2019-06-03 | 2019-09-13 | 杭州浅海科技有限责任公司 | A kind of the ground radiometer and its calibrating method of real-time calibration |
| CN110261934A (en) * | 2019-07-18 | 2019-09-20 | 常州感通威视微波科技有限公司 | Ground-Based Microwave Radiometer system and its calibrating method |
| CN110261934B (en) * | 2019-07-18 | 2022-03-08 | 常州感通威视微波科技有限公司 | Foundation microwave radiometer system and calibration method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081217 |