CN109302246A - A kind of K-band receiver noise temperature test method - Google Patents
A kind of K-band receiver noise temperature test method Download PDFInfo
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- CN109302246A CN109302246A CN201811119770.2A CN201811119770A CN109302246A CN 109302246 A CN109302246 A CN 109302246A CN 201811119770 A CN201811119770 A CN 201811119770A CN 109302246 A CN109302246 A CN 109302246A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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Abstract
The present invention relates to a kind of K-band receiver noise temperature test methods, the device that this method is related to is by K-band receiver, mounting, fixed frame, rotary shaft, turntable, room temperature black matrix, rotation axis, U-bolt, first rotation axis fixing plate, second rotation axis fixing plate, first fixing pin, second fixing pin, sliding block, sliding block connecting rod, slide rail, angle standing screw, angle hold-doun nut, angle fixed chute composition, this method uses cold empty instead of not easy-operating cold load, test device can introduce or remove the load of room temperature black matrix in feed aperture, and K-band receiver and its beam direction can arbitrarily be adjusted at the 0-90 degree elevation angle, by combining the corresponding sky temperature degree of K-band under the current elevation angle, it can complete the measuring and calculating of the receiver noise temperature.This method, which is simulated, carries out fast noise temperature test to K-band receiver in observation process, it avoids and has to for antenna elevation angle being maintained at 90 degree of tests in the cold and hot load method of tradition and using security risk brought by low temperature liquid nitrogen, have testing efficiency and safety and be obviously improved.
Description
Technical field
The present invention relates to a kind of to carry out noise temperature test side accurately and fast to K-band receiver in observation process
Method is tested dedicated for the noise temperature of K-band receiver.
Background technique
Radio astronomy be with radio telescope observe universe astronomical radiation and come radio wave a subject, and microwave
Receiver is the equipment in radio telescope dedicated for receiving electric signal.Now concerning the definition of microwave receiver, have by
Feed is classified as a part of receiver, also there is a part for thinking that feed is antenna system.Original electric signal is anti-through antenna master
Penetrate face primary event, again through subreflector secondary reflection to receiver feed at, then again the orthomode coupler of received machine,
Data terminal is transmitted to after the devices such as low-noise amplifier.
The most important technical indicator of microwave receiver is sensitivity, and sensitivity is higher, and the ability of detectable small-signal is just
It is stronger.When the received machine transmission of original electric signal, the noise of receiver itself can be added in signal, lead to weak signal
It can not be detected.The thermal noise that receiver itself generates generally is referred to as the equivalent noise temperature of receiver.Noise temperature
It is lower, also mean that the sensitivity of receiver is higher.
It promotes receiver sensitivity, reduce the design object that its noise temperature is each receiver.By entire receiver
Low-noise amplifier and the microwave device of prime refrigeration are the optimal paths for reducing receiver noise temperature.With Xinjiang observatory south
For the K-band receiver of mountain station, the noise temperature after the band reception mechanism cold is 16K, and the noise temperature under normal temperature state
It is then 600K.Since the scientific goal of observation is different, also there is considerable part radio telescope to use room temperature receiver, such as South Mountain
Station is mainly used for the Ku band receiver of holography method measurement.Compared with coolant receiver, room temperature receiver does not have to be that refrigeration part is special
Door design Dewar, receiver overall structure are relatively easy.However, being room temperature or coolant receiver, noise temperature is all its property
The direct indicator of energy quality, so the test to receiver noise temperature is particularly important.
Test for receiver noise temperature, the most frequently used be also most classic method is cold and hot load method, that is, Y because
Sub- method.This method is exactly to be put them respectively using the radiation source (such as hot and cold black matrix) of two different physical temperatures, broadband
The prime set in receiver first order amplifier perhaps frequency mixer is injected into its radiation in feed or the waveguide of receiver.
When hot and cold load is covered each by receiver feed aperture, cold load temperature T is recordedcoldWith heat load temperature
ThotAnd cold load intensity exports VcoldV is exported with heat load intensityhot, the noise temperature of receiver can be calculated according to formula 1
Spend TRx, i.e., receiver self-strength response equivalent temperature value.And formula 2 is " Y factor ", that is, when heat, cold load
The power response ratio of receiver when being placed to feed prime, wherein VRxIt is exported for the intensity of receiver itself.
In conventional cold and hot load method test, heat load generally uses the black matrix under normal temperature state, and cold load then uses will
Black matrix is placed in the foam vessel for filling with liquid nitrogen, and blackbody temperature is down to liquid nitrogen temperature (77-80K) with this.Due to cold load
It is inconvenient to use in observation process, and antenna elevation angle is adjusted to 90 degree generally before observation by noise temperature test, by receiving
Machine engineer exclusively carries out dependence test, can not then carry out in observation process.In addition, due to different-waveband receiver microwave device
Size is different, and long superhigh frequency band feed is oversized, if South Mountain station L-band receiver feed diameter is 1.05 meters, even if seeing
It is also extremely difficult using cold and hot load method before surveying, because being difficult one sufficiently large cold load of offer is completely covered on its feed mouth
Face.
Chinese patent 201510569415.5 is " a kind of suitable for the noise temperature test macro of Terahertz receiver and side
Method " described in method be using room temperature black matrix load (27 DEG C) and high temperature blackbody load (999 DEG C) to receiver carry out noise
Temperature test, used in high temperature blackbody load (999 DEG C) at least need the cavity that can provide the temperature to be just able to satisfy,
In addition receiver described in this method and test method are work in terahertz wave band, and the band microwave device is small, calibrate institute
The black matrix load volume needed is also small, if encountering the biggish microwave device of superhigh frequency band (such as South Mountain station L-band receiver feed),
One sufficiently large high temperature load of offer is provided and is completely covered on receiver feed aperture.
Summary of the invention
The object of the present invention is to provide a kind of K-band receiver noise temperature test method, the device that this method is related to
It is by K-band receiver, mounting, fixed frame, rotary shaft, turntable, room temperature black matrix, rotation axis, U-bolt, the first rotation axis
Fixed plate, the second rotation axis fixing plate, the first fixing pin, the second fixing pin, sliding block, sliding block connecting rod, slide rail, angle
Standing screw, angle hold-doun nut, angle fixed chute composition are spent, this method replaces not easy-operating cold load using cold sky,
Test device can introduce or remove the load of room temperature black matrix in feed aperture, and can be by K-band receiver and its wave beam side
Arbitrarily adjusted at the 0-90 degree elevation angle, recorded respectively in test room temperature black matrix load temperature and room temperature black matrix intensity of load output and
The intensity of cold sky exports, and in conjunction with the corresponding sky temperature degree of K-band under the current elevation angle, can complete the receiver noise temperature
Measuring and calculating.This method, which is simulated, carries out fast noise temperature test to K-band receiver in observation process, and it is cold to avoid tradition
It has to for antenna elevation angle to be maintained at 90 degree of tests in heat load method and using security risk brought by low temperature liquid nitrogen, makes to test
Efficiency and safety, which have, to be obviously improved.
A kind of K-band receiver noise temperature test method of the present invention, the device that this method is related to is by K-band
Receiver, mounting, fixed frame, rotary shaft, turntable, room temperature black matrix, rotation axis, U-bolt, the first rotation axis fixing plate, the
Two rotation axis fixing plates, the first fixing pin, the second fixing pin, sliding block, sliding block connecting rod, slide rail, the fixed spiral shell of angle
Bar, angle hold-doun nut, angle fixed chute composition, connect in K-band receiver (1) feed flange lower part with fixed frame (3),
Fixed frame (3) rear end is connect with rotary shaft (4) bottom end, and rotary shaft (4) top is connect with turntable (5), on the downside of turntable (5) with
Room temperature black matrix (6) connection, rotation axis (7) are fixed on the tops of mounting (2) by U-bolt (8), fixed frame (3) side and the
One transmission axis fixing plate (9) integrated connection, first transmission axis fixing plate (9) other end are connect with rotation axis (7), rotation axis (7)
The other end passes through U-bolt (8) and connect with the second rotation axis fixing plate (10), and second rotation axis fixing plate (10) other end passes through
First fixing pin (11) is connect with sliding block connecting rod (14), and sliding block connecting rod (14) other end passes through the second fixing pin (12)
It is connect with sliding block (13), sliding block (13) is stuck in the inside of slide rail (15), and slide rail (15) is fixed on mounting (2) top
Rear side, slide rail (15) top open up angle fixed chute (18), and angle standing screw (16) passes through angle fixed chute
(18) it is connect with sliding block (13) top, angle hold-doun nut (17) is screwed into angle standing screw (16) and pushes up with slide rail (15)
End in contact is used to fasten the position of sliding block (13), and concrete operations follow these steps to carry out:
A, it determines the elevation angle for needing receiver beam direction to be simulated, unscrews angle hold-doun nut (17), led along sliding
Rail (15) adjusts sliding block (13), and scale of the angle standing screw (16) on angle fixed chute (18) is made to be moved to target position
It sets, during which sliding block (13) and sliding block connecting rod (14) drive to the first fixing pin (11) by the second fixing pin (12), and
Take advantage of a situation and drive to the second rotation axis fixing plate (10), then through rotation axis (7), the first rotation axis fixing plate (9) by fixed frame (3) and
The beam direction of coupled K-band receiver (1) is adjusted to target elevation, is tightened angle hold-doun nut (17) and is fixed this and faces upward
Angle；
B, adjustment rotary shaft (4) drives the rotation of the room temperature black matrix (6) of turntable (5) and its underpart, keeps room temperature black matrix (6) complete
The physical temperature and K-band receiver of room temperature black matrix (6) are tested and recorded to all standing in the feed aperture of K-band receiver (1)
(1) the corresponding performance number of output end；
C, adjustment rotary shaft (4) drives the rotation of the room temperature black matrix (6) of turntable (5) and its underpart, keeps room temperature black matrix (6) complete
It removes, makes cold under the opposite elevation angle of the beam direction of K-band receiver (1) from the feed aperture of K-band receiver (1) entirely
Sky, the performance number of K-band receiver (1) output end, calls K-band under the elevation angle when testing and recording opposite cold empty under the elevation angle
Corresponding sky temperature angle value, in conjunction with the physical temperature and K-band receiver (1) output end of step b test to room temperature black matrix (6)
Corresponding performance number directly calculates the noise temperature of the receiver.
In practical application, the beam direction of receiver is likely located at any elevation angle between 0-90 degree, simulate the elevation angle into
When row receiver noise temperature is tested, it is only necessary to which sequence executes step a, step b, step c.
A kind of K-band receiver noise temperature test method of the present invention, in this method:
The K-band receiver (1), by feed, changeover portion, circle side conversion waveguide, orthomode coupler, isolator,
Waveguide coaxial converter and low-noise amplifier composition, each component are mutually cascaded according to above-mentioned order；K-band receiver (1) feed
Flange lower part is screwed with fixed frame (3) and connect, so that both when changing K-band receiver (1) and its beam direction
Keep unified posture；
The mounting (2), is built by 10 angle bar, is fixedly connected between angle bar by corner fittings and screw, main to use
Appointing between 0-90 degree is likely to be in its beam direction when observing in fixed support K-band receiver (1) in space and simulation
The meaning elevation angle；
The rotary shaft (4) and turntable (5) is mainly used for introducing or moving in K-band receiver (1) feed aperture
Except room temperature black matrix (6) needed for test, wherein rotary shaft (4) is the screw rod of a regular length, and top is connected by hard paper
Turntable (5) made of plate cutting, turntable (5) lower end, which is pasted, is suitable for the required room temperature black matrix (6) of K-band calibration, this is often
Warm black matrix (6) is commercial plate absorbing material；
Rotation axis (7), the first rotation axis fixing plate (9) and second rotation axis fixing plate (10), is special fixed
Component processed is on the other hand used on the one hand at the angle information transfer to K-band receiver (1) for adjusting sliding block (13)
U-bolt (8) are combined to realize fixed and adjustment receiver angle purpose on mounting (2) top；
Sliding block (13), sliding block connecting rod (14) and the slide rail (15), is specific customization component, they together with
Angle standing screw (16), angle hold-doun nut (17) and angle fixed chute (18) are the elevation angle adjusting structure of an entirety,
It is mainly used for being converted to the calibration information on angle fixed chute (18) into the elevation information of K-band receiver (1) beam direction,
When needing K-band receiver (1) beam direction being adjusted to a certain elevation angle, only sliding block need to be adjusted along slide rail (15)
(13) and thereon the correspondence scale on angle standing screw (16) to angle fixed chute (18).
Compared with conventional cold and hot load method test noise temperature, the present invention utilizes the cold empty replacement under the conditions of fair weather
Need to place the low temperature load of (in liquid nitrogen) manually；" one kind connects suitable for Terahertz with Chinese patent 201510569415.5
The noise temperature test macro and method of receipts machine " described in room temperature compared with high temperature load method test noise temperature, the present invention
Also with cold empty instead of needing specially to be arranged hot environment cavity just getable high temperature load in the patent.In addition to this,
Present invention only requires by being alternatively introduced into or removing room temperature black matrix in receiver feed aperture, so that receiver is tested often respectively
The radiation of warm black matrix and cold sky records the power output of receiver output end room temperature black matrix and cold sky and the physics temperature of room temperature black matrix
Degree, in conjunction with sky temperature angle value of the wave band under the corresponding elevation angle, can calculate the noise temperature of receiver.
The advantage of the invention is that related device and test method, it can be used for simulating K-band receiver and be installed on and penetrate
In the reception cabin of radiotelescope, in observation the beam direction of K-band receiver can be in observed object 0-90 degree it
Between any elevation angle state.Use the noise temperature of this method test receiver under the current elevation angle, it is no longer necessary to stop seeing
It surveys, radio telescope is played to opposite zenith direction (90 degree of the elevation angle), also do not need artificially to climb up antenna and go to provide low temperature and load
(conventional cold and hot load method) or high temperature load (room temperature described in Chinese patent 201510569415.5 and high temperature load method),
The power output and room temperature blackbody temperature and K-band of receiver output end room temperature black matrix and cold sky need to be only obtained according to step
Sky temperature degree under the corresponding elevation angle.
Detailed description of the invention
Fig. 1 is overall structure of the present invention；
Fig. 2 is that the present invention tests cold empty schematic diagram when receiver beam direction is 90 degree；
Fig. 3 is that the present invention tests room temperature black matrix schematic diagram when receiver beam direction is 45 degree；
Fig. 4 is that the present invention tests cold empty schematic diagram when receiver beam direction is 45 degree；
Fig. 5 is K-band receiver structure schematic diagram of the present invention；
Fig. 6 is mounting structures schematic diagram of the present invention；
Fig. 7 is room temperature black matrix of the present invention and dependency structure schematic diagram；
Fig. 8 is rotary shaft of the present invention and dependency structure schematic diagram；
Fig. 9 is present invention slider and dependency structure schematic diagram.
Specific embodiment
Embodiment
A kind of K-band receiver noise temperature test method of the present invention, the device that this method is related to is by K-band
Receiver, mounting, fixed frame, rotary shaft, turntable, room temperature black matrix, rotation axis, U-bolt, the first rotation axis fixing plate, the
Two rotation axis fixing plates, the first fixing pin, the second fixing pin, sliding block, sliding block connecting rod, slide rail, the fixed spiral shell of angle
Bar, angle hold-doun nut, angle fixed chute composition, connect in 1 feed flange lower part of K-band receiver with fixed frame 3, fixed
3 rear end of frame is connect with 4 bottom end of rotary shaft, and 4 top of rotary shaft is connect with turntable 5, and 5 downside of turntable is connect with room temperature black matrix 6,
Rotation axis 7 is fixed on the top of mounting 2 by U-bolt 8, and 3 side of fixed frame is connected with the first transmission axis fixing plate 9,
First transmission 9 other end of axis fixing plate is connect with rotation axis 7, and the other end of rotation axis 7 passes through U-bolt 8 and the second rotation axis
Fixed plate 10 connects, and second rotation 10 other end of axis fixing plate is connect by the first fixing pin 11 with sliding block connecting rod 14, sliding
14 other end of block connecting rod is connect by the second fixing pin 12 with sliding block 13, and sliding block 13 is stuck in the inside of slide rail 15, sliding
Dynamic guide rail 15 is fixed on the rear side on 2 top of mounting, and 15 top of slide rail opens up angle fixed chute 18, angle standing screw 16
It is connected at the top of angle fixed chute 18 and sliding block 13, angle hold-doun nut 17 is screwed into angle standing screw 16 and leads with sliding
15 tip contact of rail is used to fasten the position of sliding block 13, and concrete operations follow these steps to carry out:
A, it determines the elevation angle (assuming that when the elevation angle is 90 degree, as shown in Figure 2) for needing receiver beam direction to be simulated, twists
Loose angle hold-doun nut 17 adjusts sliding block 13 along slide rail 15, makes angle standing screw 16 along angle fixed chute 18
On scale be moved to target position, during which it is solid by the second fixing pin 12 to drive to first for sliding block 13 and sliding block connecting rod 14
Rationed marketing nail 11, and take advantage of a situation and drive to the second rotation axis fixing plate 10, then will be fixed through rotation axis 7 and the first rotation axis fixing plate 9
The beam direction of frame 3 and coupled K-band receiver 1 is adjusted to target elevation, and tightening the fixation of angle hold-doun nut 17 should
The elevation angle；
B, adjustment rotary shaft 4 drives turntable 5 and the room temperature black matrix 6 of its underpart to rotate, and is completely covered by room temperature black matrix 6
The feed aperture (assuming that when the elevation angle is 45 degree, as shown in Figure 3) of K-band receiver 1, tests and records the physics of room temperature black matrix 6
Temperature and the corresponding performance number of 1 output end of K-band receiver；
C, adjustment rotary shaft 4 drives turntable 5 and the room temperature black matrix 6 of its underpart to rotate, and makes room temperature black matrix 6 completely from K wave
The feed aperture of section receiver 1 is removed, and makes the cold sky under the opposite elevation angle of the beam direction of K-band receiver 1 (assuming that the elevation angle
At 45 degree, as shown in Figure 4), the performance number of 1 output end of K-band receiver, is called when testing and recording opposite cold empty under the elevation angle
The corresponding sky temperature angle value of K-band under the elevation angle is received in conjunction with the physical temperature and K-band of step b test to room temperature black matrix 6
The corresponding performance number of 1 output end of machine, directly calculates the noise temperature of the receiver.
In practical application, the beam direction of K-band receiver is likely located at any elevation angle between 0-90 degree, simulates this and faces upward
When angle carries out receiver noise temperature test, it is only necessary to which sequence executes step a, step b, step c.
Claims (1)
1. a kind of K-band receiver noise temperature test method, it is characterised in that the device that this method is related to is received by K-band
Machine, mounting, fixed frame, rotary shaft, turntable, room temperature black matrix, rotation axis, U-bolt, the first rotation axis fixing plate, second turn
Moving axis fixed plate, the first fixing pin, the second fixing pin, sliding block, sliding block connecting rod, slide rail, angle standing screw, angle
Hold-doun nut, angle fixed chute composition are spent, is connect in K-band receiver (1) feed flange lower part with fixed frame (3), it is fixed
Frame (3) rear end is connect with rotary shaft (4) bottom end, and rotary shaft (4) top is connect with turntable (5), turntable (5) downside and room temperature
Black matrix (6) connection, rotation axis (7) are fixed on the top of mounting (2) by U-bolt (8), and fixed frame (3) side is passed with first
Moving axis fixed plate (9) integrated connection, first transmission axis fixing plate (9) other end are connect with rotation axis (7), and rotation axis (7) is another
End is connect across U-bolt (8) with the second rotation axis fixing plate (10), and second rotation axis fixing plate (10) other end passes through first
Fixing pin (11) is connect with sliding block connecting rod (14), and sliding block connecting rod (14) other end passes through the second fixing pin (12) and sliding
Block (13) connection, sliding block (13) is stuck in the inside of slide rail (15), after slide rail (15) is fixed on mounting (2) top
Side, slide rail (15) top open up angle fixed chute (18), and angle standing screw (16) passes through angle fixed chute (18)
It is connect with sliding block (13) top, angle hold-doun nut (17) is screwed into angle standing screw (16) and connects with slide rail (15) top
The position for fastening sliding block (13) is touched, concrete operations follow these steps to carry out:
A, it determines the elevation angle for needing receiver beam direction to be simulated, unscrews angle hold-doun nut (17), along slide rail
(15) sliding block (13) are adjusted, scale of the angle standing screw (16) on angle fixed chute (18) is made to be moved to target position
It sets, during which sliding block (13) and sliding block connecting rod (14) drive to the first fixing pin (11) by the second fixing pin (12), and
Take advantage of a situation and drive to the second rotation axis fixing plate (10), then through rotation axis (7), the first rotation axis fixing plate (9) by fixed frame (3) and
The beam direction of coupled K-band receiver (1) is adjusted to target elevation, is tightened angle hold-doun nut (17) and is fixed this and faces upward
Angle；
B, adjustment rotary shaft (4) drives the rotation of the room temperature black matrix (6) of turntable (5) and its underpart, covers room temperature black matrix (6) completely
It is placed on the feed aperture of K-band receiver (1), tests and record the physical temperature and K-band receiver (1) of room temperature black matrix (6)
The corresponding performance number of output end；
C, adjustment rotary shaft (4) drives room temperature black matrix (6) rotation of turntable (5) and its underpart, make room temperature black matrix (6) completely from
The feed aperture of K-band receiver (1) is removed, and is made the cold sky under the opposite elevation angle of the beam direction of K-band receiver (1), is surveyed
The performance number of K-band receiver (1) output end, calls K-band under the elevation angle corresponding when trying and recording opposite cold empty under the elevation angle
Sky temperature angle value, the physical temperature and K-band receiver (1) output end in conjunction with step b test to room temperature black matrix (6) be corresponding
Performance number, directly calculate the noise temperature of the receiver.
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| CN201811119770.2A CN109302246B (en) | 2018-09-25 | 2018-09-25 | K-band receiver noise temperature testing method |
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| CN201811119770.2A CN109302246B (en) | 2018-09-25 | 2018-09-25 | K-band receiver noise temperature testing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991497A (en) * | 2019-04-11 | 2019-07-09 | 中国科学院新疆天文台 | A kind of dualbeam coolant receiver calibration method |
| CN110611168A (en) * | 2019-09-21 | 2019-12-24 | 孙凤山 | Multi-antenna calibration device for 5G communication |
| CN113175997A (en) * | 2021-04-30 | 2021-07-27 | 中国科学院新疆天文台 | Method for testing sky brightness temperature by using horn antenna |
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| US7349804B2 (en) * | 2004-10-18 | 2008-03-25 | Trex Enterprises Corp. | Daytime stellar imager |
| 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 |
| CN105842552A (en) * | 2015-01-15 | 2016-08-10 | 中国科学院空间科学与应用研究中心 | Microwave receiver noise measuring device and measuring method |
| CN107404357A (en) * | 2017-09-22 | 2017-11-28 | 中国科学院新疆天文台 | A kind of Q-band receiver intensity calibration method |
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2018
- 2018-09-25 CN CN201811119770.2A patent/CN109302246B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7349804B2 (en) * | 2004-10-18 | 2008-03-25 | Trex Enterprises Corp. | Daytime stellar imager |
| CN105842552A (en) * | 2015-01-15 | 2016-08-10 | 中国科学院空间科学与应用研究中心 | Microwave receiver noise measuring device and measuring method |
| 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 |
| CN107404357A (en) * | 2017-09-22 | 2017-11-28 | 中国科学院新疆天文台 | A kind of Q-band receiver intensity calibration method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991497A (en) * | 2019-04-11 | 2019-07-09 | 中国科学院新疆天文台 | A kind of dualbeam coolant receiver calibration method |
| CN110611168A (en) * | 2019-09-21 | 2019-12-24 | 孙凤山 | Multi-antenna calibration device for 5G communication |
| CN110611168B (en) * | 2019-09-21 | 2020-11-20 | 深圳市锦凌电子有限公司 | Multi-antenna calibration device for 5G communication |
| CN113175997A (en) * | 2021-04-30 | 2021-07-27 | 中国科学院新疆天文台 | Method for testing sky brightness temperature by using horn antenna |
| CN113175997B (en) * | 2021-04-30 | 2023-11-24 | 中国科学院新疆天文台 | Method for testing sky brightness temperature by horn antenna |
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| CN109302246B (en) | 2020-12-25 |
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