CN107171746B - Terahertz frequency band noise temperature measurement calibration system - Google Patents
Terahertz frequency band noise temperature measurement calibration system Download PDFInfo
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- CN107171746B CN107171746B CN201710551279.6A CN201710551279A CN107171746B CN 107171746 B CN107171746 B CN 107171746B CN 201710551279 A CN201710551279 A CN 201710551279A CN 107171746 B CN107171746 B CN 107171746B
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- black body
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a terahertz frequency band noise temperature measurement calibration system, which comprises a terahertz blackbody, a turntable, a receiver to be tested, a power detection module and a control center, wherein the turntable is arranged on the terahertz blackbody; the terahertz black body comprises a first black body and a second black body, the first black body and the second black body are both arranged on the turntable, and an isolation baffle is arranged between the first black body and the second black body; the control center controls the temperature of the terahertz blackbody, and the control center controls the turntable and the receiver to be tested to move relatively, so that the first blackbody and the second blackbody face the receiver to be tested respectively, and the receiver to be tested acquires a power signal; the power detection module acquires a power signal sent by the receiver to be detected and transmits the power signal to the control center, and the control center performs measurement calibration on the receiver to be detected according to the power signal. The measurement calibration system can accurately measure and calibrate the terahertz receiver, has wider frequency coverage range, and has good repeatability and high measurement precision.
Description
Technical Field
The invention relates to the technical field of radio communication, in particular to a noise temperature measurement calibration system for low-frequency terahertz band receivers and functional devices such as noise amplifiers and mixers.
Background
With the continuous exploration of the electromagnetic spectrum, humans have gained full knowledge of electronics and optics, and through research of electronics and optics, various devices have been developed, resulting in two more mature research and application technologies. One is microwave millimeter wave technology and the other is optical technology.
The microwave millimeter wave technology is widely applied in the fields of radar, radio astronomy, communication, imaging, navigation and the like; the application of optical technology has penetrated the aspects of people's daily lives. However, there are abundant spectrum resources which are not fully developed between the millimeter wave and the optical frequency band, namely the terahertz frequency band. With the development of terahertz technology, the drainage fields of terahertz biological application, medical application, imaging application, atmospheric science, environmental science, communication technology, safety detection and the like are all beginning to mature, and a terahertz receiver system is an indispensable important component.
The terahertz receiver has the main functions of amplifying, preselecting, frequency-converting, filtering and the like the weak radio frequency signals received by the antenna and reflected by the target, so that the weak radio frequency signals transmitted by the target are changed into video signals or digital signals with enough amplitude to meet the requirement of digital processing. The dynamic range of the echo signal is large, and the original amplitude and phase information of the echo signal should be kept in the whole working process of the receiver, which requires high sensitivity, low noise coefficient and high gain of the receiver.
Sensitivity refers to the ability of a receiver to receive weak signals, the higher the sensitivity of the receiver, the weaker the signal that can be received. The magnitude of the sensitivity is in turn mainly dependent on the internal noise performance of the receiver. The internal noise performance of a receiver is typically measured by the noise temperature.
The testing and calibration of the receiver noise temperature is not currently done automatically by a set of system tools. This field currently only supports receiver noise temperature testing below 140GHz and provides some manual test schemes in different frequency bands. At present, the calibration and calibration of the noise temperature of a terahertz receiver and related devices are always lack of effective and authoritative technical means, and the accuracy and the repeatability of the test are also always difficult problems of noise temperature test.
Therefore, how to design a test mode with high repeatability and accuracy is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a terahertz frequency band noise temperature measurement calibration system which can accurately measure and calibrate a terahertz receiver.
In order to achieve the technical aim, the invention provides a terahertz frequency band noise temperature measurement calibration system which comprises a terahertz blackbody, a turntable, a receiver to be tested, a power detection module and a control center; the terahertz black body comprises a first black body and a second black body, the first black body and the second black body are both arranged on the rotary table, and an isolation baffle is arranged between the first black body and the second black body; the control center controls the temperature of the terahertz blackbody, and the control center controls the rotary table and the receiver to be tested to move relatively, so that the first blackbody and the second blackbody face the receiver to be tested respectively, and the receiver to be tested acquires a power signal; the power detection module acquires a power signal sent by the receiver to be detected and transmits the power signal to the control center, and the control center performs measurement calibration on the receiver to be detected according to the power signal.
Optionally, the turntable comprises a motor, a controller, a supporting platform and a supporting plate, the supporting platform is installed at the output end of the motor, and the first black body and the second black body are respectively fixed on the supporting platform by the two supporting plates; the control center controls the motor through the controller, and the motor drives the turntable to rotate or move.
Optionally, the support platform is a circular platform or a square platform.
Optionally, the receiver to be tested is set through a moving component, and the control center controls the moving component to move, so that the receiver to be tested is opposite to the first black body and the second black body respectively.
Optionally, the terahertz blackbody is a blackbody made of a wave-absorbing material, the temperature of the wave-absorbing material is precisely controllable, and the wave-absorbing material has extremely low reflectivity in a terahertz frequency band.
Optionally, the first black body and the second black body are respectively a high temperature black body and a normal temperature black body, or are a high temperature black body and a low temperature black body, or are a normal temperature black body and a low temperature black body.
Optionally, the control center comprises a turntable control module, a temperature control module and a data processing module; the turntable control module controls rotation of the turntable; the temperature control module controls the temperature of the high-temperature black body or the low-temperature black body; and the data processing module processes the power signal and the power data of the terahertz blackbody and measures and calibrates the receiver to be measured.
Optionally, the data processing module processes and calculates the data by adopting a Y-factor algorithm.
The invention provides a terahertz frequency band noise temperature measurement calibration system which comprises a terahertz blackbody, a turntable, a receiver to be tested, a power detection module and a control center, wherein the terahertz blackbody is arranged on the turntable; the terahertz black body comprises a first black body and a second black body, the first black body and the second black body are both arranged on the turntable, and an isolation baffle is arranged between the first black body and the second black body; the control center controls the temperature of the terahertz blackbody, and the control center controls the turntable and the receiver to be tested to move relatively, so that the first blackbody and the second blackbody face the receiver to be tested respectively, and the receiver to be tested acquires a power signal; the power detection module acquires a power signal sent by the receiver to be detected and transmits the power signal to the control center, and the control center performs measurement calibration on the receiver to be detected according to the power signal.
The terahertz blackbody is an accurate standard blackbody, the accurate blackbody temperature can be obtained, the calibration system utilizes the characteristic of the terahertz blackbody to calibrate the terahertz receiver, in the use process, the two terahertz blackbody are respectively towards the receiver to be tested, the receiver to be tested respectively acquires temperature signals of the two terahertz blackbody, after the receiver to be tested acquires the temperature signals, a certain power signal is sent out, the power detection module acquires the power signal sent out by the receiver to be tested and transmits the power signal to the control center, and the control center processes the power signal, so that the noise temperature of the receiver to be tested can be calculated to calibrate the terahertz receiver according to the detection result. The calibration system has wider frequency coverage range, good repeatability and high measurement accuracy.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention.
FIG. 1 is a schematic diagram of a terahertz frequency band noise temperature measurement calibration system provided by the invention;
fig. 2 is a schematic structural diagram of an embodiment of a turntable of the terahertz frequency band noise temperature measurement calibration system provided by the invention;
wherein, the correspondence between the reference numerals and the component names in fig. 1 and 2 is as follows:
a first black body 1; a second black body 2; an isolation baffle 3; a support platform 4; and a support plate 5.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a turntable of a terahertz frequency band noise temperature measurement calibration system provided by the present invention.
In a specific embodiment, the invention provides a terahertz frequency band noise temperature measurement calibration system, which comprises a terahertz blackbody, a turntable, a receiver to be tested, a power detection module and a control center; the terahertz black body comprises a first black body 1 and a second black body 2, the first black body 1 and the second black body 2 are both arranged on the turntable, and an isolation baffle 3 is arranged between the first black body 1 and the second black body 2; the control center controls the temperature of the terahertz blackbody, and the control center controls the rotary table to move relative to the receiver to be tested, so that the first blackbody 1 and the second blackbody 2 face the receiver to be tested respectively, and the receiver to be tested acquires a power signal; the power detection module acquires a power signal sent by the receiver to be detected and transmits the power signal to the control center, and the control center performs measurement calibration on the receiver to be detected according to the calculation results of the blackbody temperature, the power signal and the like.
The terahertz blackbody is an accurate standard blackbody, the accurate blackbody temperature can be obtained, and the terahertz receiver is calibrated by the calibration system by utilizing the characteristic of the terahertz blackbody. On the revolving stage, first blackbody 1 and second blackbody 2 are separated by isolation baffle 3, avoid the temperature between the two to influence each other, and first blackbody 1 and second blackbody 2 are different in temperature. If the black body is a normal-temperature black body, the temperature of the black body is kept unchanged all the time; if the black body is a high-temperature black body or a low-temperature black body, the temperature of the black body is adjustable and controlled by a control center, wherein the highest temperature of the high-temperature black body is not more than 90 ℃.
In the use process, the turntable and the receiver to be detected relatively move, the turntable can move, the receiver is not moved, the turntable can also be not moved, and the receiver moves, so that when the first blackbody 1 faces the receiver to be detected, the receiver to be detected acquires a temperature signal of the first blackbody 1, at the moment, the receiver to be detected sends out a certain power signal, the power detection module acquires the power signal sent by the receiver to be detected and transmits the power signal to the control center, and the control center processes the power signal to determine whether the detection result of the receiver to be detected is accurate;
then, the control center controls the rotary table and the receiver to be tested to move relatively, so that when the second blackbody 2 faces the receiver to be tested, the receiver to be tested acquires a temperature signal of the second blackbody 2 and sends out a certain power signal, the power detection module acquires the power signal sent by the receiver to be tested and transmits the power signal to the control center, and the control center processes the power signal to determine a detection result of the receiver to be tested; and calibrating the receiver to be tested according to the detection result.
The calibration system can also calibrate the noise temperature measurement of functional devices such as a noise amplifier, a mixer and the like. The calibration system has a wide frequency coverage range, the frequency coverage range can reach 80-1000 GHz, the terahertz blackbody is a standard blackbody, and the calibration system can be repeatedly used, has good repeatability and high measurement accuracy.
In a further specific embodiment, the turntable comprises a motor, a controller, a supporting platform 4 and a supporting plate 5, wherein the supporting platform 4 is arranged at the output end of the motor, and the first black body 1 and the second black body are respectively fixed on the supporting platform 4 by the two supporting plates 5; the control center controls the motor through the controller, and the motor drives the turntable to rotate or move.
The motor controls the supporting platform 4 to rotate or move, the first black body 1 and the second black body 2 are arranged on the supporting platform 4, and the positions of the first black body 1 and the second black body 2 are changed when the supporting platform 4 rotates, so that the first black body 1 and the second black body 2 face towards a receiver to be detected respectively. The control center controls the motor through the controller, and then indirectly controls the rotation or movement of the support platform 4.
Specifically, the supporting platform may be a circular platform, a square platform, or a platform with other results.
In another specific embodiment, the receiver to be tested is set through the moving component, and the control center controls the moving component to move, so that the receiver to be tested is opposite to the first black body 1 and the second black body 2 respectively. In this embodiment, the moving component moves the receiver to be tested, and the turntable is kept still, so that the frequency signals of the first black body 1 and the second black body 2 can be obtained respectively.
In a preferred embodiment, the terahertz blackbody is made of a wave-absorbing material, the temperature of the wave-absorbing material is precisely controllable, and the wave-absorbing material has extremely low reflectivity in the terahertz frequency band.
The terahertz blackbody is made of a wave-absorbing material, the wave-absorbing material with ultra-low reflectivity on the terahertz frequency band is selected, and meanwhile, the wave-absorbing material is required to have uniform and precisely controllable temperature. The accurate blackbody temperature control and measurement system is built by the material, and the blackbody is required to keep ultra-low reflectivity while changing the blackbody temperature.
In a specific embodiment, the first black body 1 and the second black body 2 are a high temperature black body and a normal temperature black body, or a high temperature black body and a low temperature black body, or a normal temperature black body and a low temperature black body, respectively.
The temperature of the normal temperature black body is kept unchanged, the temperatures of the high temperature black body and the low temperature black body are changeable, and the temperatures of the high temperature black body and the low temperature black body are controlled by the control center.
In each specific embodiment, the control center comprises a turntable control module, a temperature control module and a data processing module; the turntable control module controls the rotation of the turntable; the temperature control module controls the temperature of the high-temperature black body or the low-temperature black body; and the data processing module processes the power signal and the power data of the terahertz blackbody, and measures and calibrates the receiver to be measured.
In a further specific embodiment, the data processing module processes and calculates the data by using a Y-factor algorithm.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (5)
1. The terahertz frequency band noise temperature measurement calibration system is characterized by comprising a terahertz blackbody, a turntable, a receiver to be tested, a power detection module and a control center; the terahertz black body comprises a first black body and a second black body, the first black body and the second black body are both arranged on the rotary table, and an isolation baffle is arranged between the first black body and the second black body; the control center controls the temperature of the terahertz blackbody, and the control center controls the rotary table and the receiver to be tested to move relatively, so that the first blackbody and the second blackbody face the receiver to be tested respectively, and the receiver to be tested acquires a power signal; the power detection module acquires a power signal sent by the receiver to be detected and transmits the power signal to the control center, and the control center performs measurement calibration on the receiver to be detected according to the power signal;
the turntable comprises a motor, a controller, a supporting platform and supporting plates, the supporting platform is arranged at the output end of the motor, and the first black body and the second black body are respectively fixed on the supporting platform by the two supporting plates; the control center controls the motor through the controller, and the motor drives the turntable to rotate or move;
the supporting platform is a round platform or a square platform;
the terahertz blackbody is made of a wave-absorbing material, the temperature of the wave-absorbing material is accurately controllable, and the wave-absorbing material has extremely low reflectivity in the terahertz frequency band.
2. The terahertz frequency band noise temperature measurement calibration system according to claim 1, wherein the receiver to be measured is set by a moving assembly, and the control center controls the moving assembly to move so that the receiver to be measured is opposite to the first black body and the second black body, respectively.
3. The terahertz frequency band noise temperature measurement calibration system according to claim 2, wherein the first black body and the second black body are a high-temperature black body and a normal-temperature black body, or a high-temperature black body and a low-temperature black body, or a normal-temperature black body and a low-temperature black body, respectively.
4. The terahertz frequency band noise temperature measurement calibration system according to claim 1, wherein the control center comprises a turntable control module, a temperature control module and a data processing module; the turntable control module controls rotation of the turntable; the temperature control module controls the temperature of the first black body or the second black body; and the data processing module processes the power signal and the power data of the terahertz blackbody and measures and calibrates the receiver to be measured.
5. The terahertz frequency band noise temperature measurement calibration system of claim 4, wherein the data processing module processes and calculates data by using a Y-factor algorithm.
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| CN201710551279.6A CN107171746B (en) | 2017-07-07 | 2017-07-07 | Terahertz frequency band noise temperature measurement calibration system |
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| CN201710551279.6A CN107171746B (en) | 2017-07-07 | 2017-07-07 | Terahertz frequency band noise temperature measurement calibration system |
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| CN107171746B true CN107171746B (en) | 2023-08-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105187136A (en) * | 2015-09-09 | 2015-12-23 | 中国工程物理研究院电子工程研究所 | Terahertz receiver noise temperature test system and method |
| JP2016170102A (en) * | 2015-03-13 | 2016-09-23 | 日本信号株式会社 | Control circuit and detector |
| CN106813779A (en) * | 2016-12-25 | 2017-06-09 | 中国科学院紫金山天文台 | A kind of full-automatic Terahertz atmospheric characteristic measuring system and its calibration method |
| CN206865465U (en) * | 2017-07-07 | 2018-01-09 | 深圳翠博微系统有限公司 | A kind of Terahertz frequency range noise temperature measures calibration system |
-
2017
- 2017-07-07 CN CN201710551279.6A patent/CN107171746B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016170102A (en) * | 2015-03-13 | 2016-09-23 | 日本信号株式会社 | Control circuit and detector |
| CN105187136A (en) * | 2015-09-09 | 2015-12-23 | 中国工程物理研究院电子工程研究所 | Terahertz receiver noise temperature test system and method |
| CN106813779A (en) * | 2016-12-25 | 2017-06-09 | 中国科学院紫金山天文台 | A kind of full-automatic Terahertz atmospheric characteristic measuring system and its calibration method |
| CN206865465U (en) * | 2017-07-07 | 2018-01-09 | 深圳翠博微系统有限公司 | A kind of Terahertz frequency range noise temperature measures calibration system |
Non-Patent Citations (1)
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| 黑体的太赫兹辐射特性与测试方法;李宏光等;《激光与光电子学进展》;20130710(第07期);全文 * |
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