CN107449965B - Satellite-borne microwave radiometer - Google Patents
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Abstract
The invention provides a satellite-borne microwave radiometer, which comprises: the device comprises a feed source, a calibration body, a motor, a microwave receiving antenna, a scanning driving control module, a high-speed digital acquisition system and a microwave receiver; the motor drives the microwave receiving antenna to rotate under the control of the scanning driving control module, the high-speed digital acquisition system is connected with the microwave receiver, the scanning driving control module and the upper computer, the high-speed digital acquisition system is communicated with the upper computer, digital acquisition and quantization processing are carried out in a multi-channel mode after the spectral resolution of an analog signal output by the microwave receiver is refined, the obtained digital signal is output to the upper computer, and meanwhile, the operation of the scanning driving control module is controlled. The invention provides the ultra-wideband ultra-multi-channel microwave radiometer by utilizing the basic theory of the traditional microwave radiometer, realizes the measurement of the microwave radiometer with fine spectral band, improves the vertical resolution of atmospheric parameter detection, and avoids the defects of the traditional microwave radiation conventional detection.
Description
Technical Field
The invention relates to the field of microwave radiometers, in particular to a satellite-borne microwave radiometer.
Background
The atmospheric temperature and humidity profile is an important meteorological parameter, and currently, the detection method commonly adopted in meteorological service application comprises the following steps: a radio sonde, a sounding balloon field measurement, a foundation microwave radiometer and a polar orbit meteorological satellite microwave radiometer.
However, the above detection methods have the following different disadvantages: radiosondes cannot be installed and operated in densely populated areas and have low spatial and temporal resolution due to their bulkiness, high cost, complex installation and operating conditions, and high power radio radiation requirements; the balloon field detection technology can only carry out limited measurement in discrete time, the long-term detection cost is high, generally only 1-2 times of measurement data can be obtained every day, and the release of the balloon is limited by meteorological conditions. The foundation microwave radiometer has locality and individual difference, and networking is not realized at present; the satellite-borne microwave/millimeter wave radiometer remotely senses atmospheric parameters, has global detection capability, particularly in the air above the sea and in terrestrial regions with rare people, but the existing microwave radiometers are all traditional narrow-band systems, are limited by observation geometry, have poor vertical resolution for low altitude, particularly cloud shielding and strong absorption, have opacity to millimeter-wave-band electromagnetic waves by atmosphere, and have poor detection performance for the bottom of a convection layer and a boundary layer by satellite remote sensing.
In order to meet the requirement of observing the brightness temperature corresponding to different frequency channels in a wide frequency spectrum range, the spectral resolution is refined, 2011, a concept of 'microwave hyperspectral' is disclosed and proposed for the first time in a Lincoln laboratory, a new direction for developing a microwave radiometer is opened up, an airborne microwave hyperspectral microwave radiometer is developed in 2012, the frequency is 118.75GHz and 183.31GHz, and the airborne microwave hyperspectral microwave radiometer is respectively refined into 36 channels and 15 channels. In China, a spectrum analyzer with the bandwidth of 250MHz and the spectral resolution of 15KHz is developed by aiming at water vapor and oxygen absorption spectral lines in the space center, and the research on the high-speed broadband correlator technology is developed, so that certain progress is made. The microwave hyperspectral radiometer with 80 channels in total in 18-26GHz of ground-based K wave band is researched and realized in the same way between 2011 and 2013 of Beijing aerospace university. However, the developed microwave radiometer has a low frequency, a narrow bandwidth and a low spectral resolution, so that the accuracy of measuring the atmospheric temperature and humidity is low.
Disclosure of Invention
The invention aims to provide an ultra-wideband ultra-multichannel satellite-borne microwave radiometer with fine spectrum analysis capability for improving the vertical resolution of the microwave radiometer for atmospheric detection, wherein the satellite-borne microwave radiometer is a microwave remote sensing system with a continuous spectrum channel, and has good application prospect in the aspects of high vertical resolution detection of microwave atmospheric temperature and humidity and atmospheric trace gas detection with narrow spectral lines.
In order to achieve the above object, the present invention provides a satellite-borne microwave radiometer, including: the device comprises a feed source, a calibration body, a motor, a microwave receiving antenna, a scanning driving control module, a high-speed digital acquisition system and a microwave receiver; the microwave receiving antenna is controlled by the scanning driving control module to drive the microwave receiving antenna to rotate, the microwave receiving antenna transmits received electromagnetic wave signals to the feed source which is arranged opposite to the microwave receiving antenna through scanning atmosphere and the calibration body, the microwave receiver receives microwave signals which are output by the feed source and are matched with the working frequency of the feed source, the high-speed digital acquisition system is connected with the microwave receiver, the scanning driving control module and the upper computer, the satellite-borne microwave radiometer is communicated with the upper computer through the high-speed digital acquisition system, the high-speed digital acquisition system realizes that the spectral resolution of analog signals output by the microwave receiver is refined, digital acquisition and quantization processing are carried out in a multi-channel mode, the obtained digital signals are output to the upper computer, and meanwhile, the operation of the scanning driving control module is controlled.
As a further improvement of the above technical solution, the microwave receiver adopts a low-frequency receiver with a working frequency of 50GHz-70GHz for detecting atmospheric temperature data; the low-frequency receiver adopts a superheterodyne system receiver; the low band receiver includes: the device comprises an isolator, a waveguide filter, a preamplifier, a power divider, a local oscillator, a mixer, a main intermediate frequency amplifier, a band-pass filter and a low-noise amplifier;
the isolator shields and isolates radio frequency signals received by the feed source, the waveguide filter conducts preliminary filtering selection on waveguide signals generated by isolation, the power divider divides the waveguide signals into two paths of power signals after the channel preamplifier conducts signal amplification, each path of power signals mixes high-frequency electromagnetic waves generated by a local oscillator with the power signals through a mixer to generate difference frequency, the difference frequency generates two paths of orthogonal signals through shifting 90 degrees, four paths of intermediate frequency signals with the bandwidth of 5GHz are sequentially amplified, frequency-selected and re-amplified through a main intermediate frequency amplifier, a band-pass filter and a low noise amplifier and then input to a high-speed digital acquisition system.
As a further improvement of the above technical solution, the high-speed digital acquisition system divides each path of intermediate frequency signals with a bandwidth of 5GHz into 50 channels for output in different frequency bands; the bandwidth of all channels is 100 MHz.
As a further improvement of the above technical solution, the microwave receiver adopts a high-frequency receiver with a working frequency of 183.31 ± 8GHz for detecting atmospheric humidity data; the high-frequency receiver adopts a superheterodyne system receiver; the high band receiver includes: the device comprises an isolator, a waveguide filter, a preamplifier, a power divider, a local oscillator, a mixer, a main intermediate frequency amplifier, a band-pass filter and a low-noise amplifier;
the isolator shields and isolates radio frequency signals received by the feed source, the waveguide filter conducts preliminary filtering selection on waveguide signals generated by isolation, the power divider divides the waveguide signals into two paths of power signals after the channel preamplifier conducts signal amplification, each path of power signals mixes high-frequency electromagnetic waves generated by the local oscillator with the power signals through the frequency mixer to generate difference frequency, and the formed two paths of intermediate frequency signals with the bandwidth of 8GHz are amplified, frequency-selected and re-amplified through the main intermediate frequency amplifier, the band-pass filter and the low noise amplifier in sequence and then input to the high-speed digital acquisition system.
As a further improvement of the above technical solution, the high-speed digital acquisition system divides each path of intermediate frequency signals with a bandwidth of 8GHz into 80 channels for output in different frequency bands; the bandwidth of all channels is 100 MHz.
As a further improvement of the above technical solution, the microwave receiving antenna includes a plane mirror and a parabolic reflector, the plane mirror reflects the received electromagnetic wave signal to the parabolic reflector in the form of a plane wave by scanning the atmosphere and the calibration body, and the parabolic reflector reflects the plane wave into the feed source for the second time.
The satellite-borne microwave radiometer has the advantages that:
the invention provides the ultra-wideband ultra-multi-channel microwave radiometer by utilizing the basic theory of the traditional microwave radiometer, realizes the measurement of the microwave radiometer with fine spectral band, improves the vertical resolution of atmospheric parameter detection, and avoids the defects of the traditional microwave radiation conventional detection.
Drawings
Fig. 1 is a schematic structural diagram of a satellite-borne microwave radiometer in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a low-band receiver in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a high-band receiver in an embodiment of the present invention.
Detailed Description
The invention relates to a satellite-borne microwave radiometer, which is described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the present invention provides a satellite-borne microwave radiometer, which includes: the device comprises a microwave receiving antenna, a motor, a scanning driving control module, a feed source, a microwave receiver, a calibration body and a high-speed data acquisition system. The motor drives the microwave receiving antenna to rotate under the control of the scanning drive control module, so that the microwave receiving antenna can carry out atmospheric detection scanning and calibration. The calibration body is used for providing a reference brightness temperature standard and is isolated from the ambient temperature through precise temperature control. The microwave receiving antenna transmits received electromagnetic wave signals to a feed source arranged opposite to the microwave receiving antenna through scanning atmosphere and a calibration body, the microwave receiver receives microwave signals output by the feed source and matched with the working frequency of the feed source, the high-speed digital acquisition system is connected with the microwave receiver, the scanning drive control module and an upper computer, the satellite-borne microwave radiometer is communicated with the upper computer through the high-speed digital acquisition system, the high-speed digital acquisition system performs digital acquisition and quantization processing in a multi-channel mode after refining the spectral resolution of analog signals output by the microwave receiver, outputs the obtained digital signals to the upper computer, and controls the operation of the scanning drive control module.
Based on the satellite-borne microwave radiometer with the structure, as shown in fig. 1, the microwave receiving antenna comprises a plane mirror and a parabolic reflector, the plane mirror reflects a received electromagnetic wave signal to the parabolic reflector in a plane wave form by scanning atmosphere and a calibration body, the parabolic reflector is installed at a fixed position and keeps an optimal standing wave ratio with a feed source, and the plane wave reflected by the plane mirror is received by the feed source after being reflected for the second time. Therefore, the relative position between the parabolic reflector and the feed source is fixed, the output fluctuation phenomenon caused by the change of the standing-wave ratio of the antenna feed system after the relative position between the parabolic reflector and the feed source is changed during rotation is avoided, namely, the phenomenon that certain output pixel data are fixedly higher or lower than the data of adjacent pixels is avoided, and the interference error of system fixation is eliminated.
As shown in fig. 1, in this embodiment, the microwave radiometer on board with ultra-wideband and ultra-multichannel characteristics provided by the present invention is composed of 2 receivers, including a 183.31GHz receiver and a V-band receiver. The 183.31GHz receiver is a high-frequency band receiver with the working frequency of 183 +/-8 GHz. The V-band receiver is a low-frequency receiver with the working frequency of 50GHz-70GHz, and the low-frequency receiver comprises two receiving links which respectively receive signals of 50 GHz-60 GHz and 60 GHz-70 GHz. The 50GHz-70GHz low-frequency receiver is used for realizing atmospheric temperature detection, and the 183.31GHz high-frequency receiver is used for realizing atmospheric humidity detection. The two receivers are both super heterodyne system receivers and are realized by local oscillator mixing, further, the output of intermediate frequency signals of the parallel multi-subband receiver is realized by utilizing a power divider on the basis of a broadband, and meanwhile, the acquisition and processing of fine spectrum resolution signals are realized by utilizing a high-speed digital acquisition system and are transmitted to an upper computer.
As shown in fig. 2, the low-band receiver adopts a technical scheme of first performing low-noise amplification and then performing power division on two paths of IQ mixing down-conversion reception. The V-band receiver comprises two receiving links which respectively receive signals of 50 GHz-60 GHz and 60 GHz-70 GHz. And then IQ down-conversion of the two paths of radio frequency signals is carried out to DC-5 GHz local oscillation signals, the local oscillation signals are generated by a VCO, and the signals are supplied to an IQ mixer after phase locking.
Specifically, the low-band receiver with an operating frequency of 50GHz-70GHz includes: isolator, waveguide filter, preamplifier, power divider, local oscillator, mixer, main intermediate frequency amplifier, band-pass filter, low noise amplifier. The isolator effectively shields and isolates the radio frequency signal received by the feed source. The waveguide filter is used for initially filtering and selecting waveguide signals after isolation processing, the waveguide signals are amplified through the preamplifier, the power divider is used for dividing the waveguide signals into two paths of power signals, each path of power signals is used for mixing high-frequency electromagnetic waves generated by the local oscillator with the power signals through the mixer to generate difference frequency, orthogonal two paths of signals are achieved through shifting 90 degrees, namely four parallel intermediate-frequency signals with the bandwidth of 5GHz are formed, the radio-frequency signals are converted into four paths of parallel intermediate-frequency signals in a down-conversion mode, the four paths of intermediate-frequency signals are amplified and band-pass filtered through the main intermediate-frequency amplifier and the band-pass filter in sequence, and the signals are output to the high-speed digital acquisition system to be subjected to precise spectral resolution digital acquisition after being amplified through the low-noise amplifier. The high-speed digital acquisition system divides each path of intermediate frequency signals with the bandwidth of 5GHz into 50 channels for output in different frequency bands; the spectral resolution of each channel is 100MHz, the number of all channels is 200, the number of channels receiving signals can be increased or decreased as required, the spectral resolution can be properly adjusted, the configuration is determined by the configuration of the high-speed digital acquisition system, the specific selectable channel configuration result is shown in each channel output frequency band of the 50GHz-70GHz receiver shown in table 1, and the signal division can also be performed in each channel output frequency band shown in table 2.
As shown in fig. 3, in the present embodiment, the high band receiver with an operating frequency of 183.31GHz ± 8GHz includes: isolator, waveguide filter, preamplifier, power divider, local oscillator, mixer, main intermediate frequency amplifier, band-pass filter, low noise amplifier. The isolator effectively shields and isolates radio frequency received by the feed source. The waveguide filter performs preliminary filtering selection on waveguide signals after isolation processing, the waveguide signals are amplified through a preamplifier, the waveguide signals are divided into two paths of power signals through a power divider, high-frequency electromagnetic waves generated by a local oscillator and the power signals are mixed through a mixer to generate difference frequency, namely two paths of intermediate-frequency signals with 8GHz bandwidth are formed, and therefore radio-frequency signals are converted into the intermediate-frequency signals in a down-conversion mode, the two paths of intermediate-frequency signals are amplified and band-pass filtered through a main intermediate-frequency amplifier and a band-pass filter in sequence, and then the intermediate-frequency signals are amplified through a low-noise amplifier and then output to a high-speed digital acquisition system to perform precise spectral resolution digital acquisition. The high-speed digital acquisition system divides each path of intermediate frequency signals with the bandwidth of 8GHz into 80 channels for output in different frequency bands; wherein the spectral resolution of each channel is 100MHz and the number of all channels is 160. The number of channels for receiving signals can be increased or decreased as required, the spectral resolution can be properly adjusted, the configuration of the high-speed digital acquisition system is used for determining, the specific optional channel configuration result is shown in each channel output frequency band of the 183.31GHz receiver shown in the table 1, and the signal division can also be performed on each channel output frequency band shown in the table 2, wherein the 183.31GHz alternative 2 has the two-wing resolution of the absorption peak value of 200MHz, and the central resolution of the peak value of 50 MHz.
Watch 1
Watch two
Based on the low-frequency band receiver and the high-frequency band receiver with the structures, as broadband receiving needs to solve the broadband integration problems of broadband amplification, broadband mixing, broadband waveguide micro-strip conversion circuits and the like, the working bandwidth of the existing amplifier is generally 15GHz and cannot meet the working requirement of 20GHz, and a broadband low-noise amplifier can be adopted in the invention. Meanwhile, the isolation between each path is realized by adopting a broadband isolator, the isolation of the broadband synthesizer is improved, and the deterioration of the synthesis performance by the working out-of-band standing wave of the amplifier is reduced. The conversion of the waveguide microstrip probe circuit is realized by adopting a broadband matching circuit, the standing wave coefficient between internal circuits is optimized, and the in-band gain fluctuation is improved.
Based on the satellite-borne microwave radiometer with the structure, the high-speed digital acquisition system acquires analog signals with 5GHz and 8GHz bandwidths output by the receiver at the medium frequency at the sampling rate of 8 bits and the precision spectrum resolution, and the analog-to-digital conversion is realized. Meanwhile, the high-speed digital acquisition system is connected with the scanning drive control module and the upper computer, communicates with the upper computer through the high-speed digital acquisition system and controls the scanning drive control module. The high-speed digital acquisition system is also responsible for acquiring and quantizing scientific data and temperature data of the microwave receiving antenna and the microwave receiver, and adjusting the channel gain of the receiver according to a data processing result to enable the channel to work in an optimal state; collecting the angle coding signal and the antenna signal state, and controlling the scanning drive and the angle coding circuit to work in a master or backup mode; controlling the power on and off of each channel of the receiver through data injection; receiving a remote control instruction of an upper computer, decoding and executing the instruction, and controlling the working state of the system; and encoding the engineering telemetering parameters, and transmitting the encoded engineering telemetering parameters to an upper computer.
The high-speed digital acquisition system has the advantages of high precision and low power consumption, 4 pieces of ultra-high-speed ADCEV10AQ190 are adopted for sampling 4 independent channels, 10 bits are quantized, the sampling rate is 5GHz, a sampled signal is output after being subjected to 1:8demux in the ADC, and the clock is in a DDR mode and is halved into 312.5 MHz. The data after sampling is sampled 4 paths of signals through 4 high-speed A/D converters and is externally connected with a multiplexing module to realize the speed reduction of the high-speed data stream, then the analog signals are sampled according to the Nyquist sampling law through a new generation FPGA-Vertex 5 chip of Xilinx company, in order to avoid the loss of information, the sampling frequency must be more than or equal to twice the bandwidth of the sampling signals, then the quantized data is used for carrying out correlation operation, and the correlation result is transmitted to an upper computer.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A space-borne microwave radiometer, comprising: the feed source, the calibration body and the motor; it is characterized by also comprising: the system comprises a microwave receiving antenna, a scanning driving control module, a high-speed digital acquisition system and a microwave receiver; the microwave receiving antenna is controlled by the scanning driving control module to drive the microwave receiving antenna to rotate, the microwave receiving antenna transmits a received electromagnetic wave signal to a feed source arranged opposite to the microwave receiving antenna through scanning atmosphere and a calibration body, the microwave receiver receives a microwave signal which is output by the feed source and is matched with the working frequency of the feed source, the high-speed digital acquisition system is connected with the microwave receiver, the scanning driving control module and an upper computer, the satellite-borne microwave radiometer is communicated with the upper computer through the high-speed digital acquisition system, the high-speed digital acquisition system realizes the thinning of the spectral resolution of an analog signal output by the microwave receiver, then carries out digital acquisition and quantization in a multi-channel mode, outputs the obtained digital signal to the upper computer, and controls the operation of the scanning driving control module;
the microwave receiver adopts a low-frequency receiver with the working frequency of 50GHz-70GHz and is used for detecting atmospheric temperature data; the low-frequency receiver adopts a superheterodyne system receiver; the low band receiver includes: the device comprises an isolator, a waveguide filter, a preamplifier, a power divider, a local oscillator, a mixer, a main intermediate frequency amplifier, a band-pass filter and a low-noise amplifier;
the isolator shields and isolates radio frequency signals received by the feed source, the waveguide filter conducts preliminary filtering selection on waveguide signals generated by isolation, the channel preamplifier conducts signal amplification, the power divider divides the waveguide signals into two paths of power signals, each path of power signals mixes high-frequency electromagnetic waves generated by a local oscillator with the power signals through a mixer to generate difference frequency, the difference frequency generates two paths of orthogonal signals through shifting 90 degrees, four paths of intermediate frequency signals with the bandwidth of 5GHz are sequentially amplified, frequency-selected and re-amplified through a main intermediate frequency amplifier, a band-pass filter and a low noise amplifier and then input to a high-speed digital acquisition system;
the high-speed digital acquisition system divides each path of intermediate frequency signals with the bandwidth of 5GHz into 50 channels for output in different frequency bands; the bandwidth of all channels is 100 MHz.
2. The spaceborne microwave radiometer according to claim 1, wherein the microwave receiver employs a high-band receiver having an operating frequency of 183.31 ± 8GHz for detecting atmospheric humidity data; the high-frequency receiver adopts a superheterodyne system receiver; the high band receiver includes: the device comprises an isolator, a waveguide filter, a preamplifier, a power divider, a local oscillator, a mixer, a main intermediate frequency amplifier, a band-pass filter and a low-noise amplifier;
the isolator shields and isolates radio frequency signals received by the feed source, the waveguide filter conducts preliminary filtering selection on waveguide signals generated by isolation, the power divider divides the waveguide signals into two paths of power signals after the channel preamplifier conducts signal amplification, each path of power signals mixes high-frequency electromagnetic waves generated by the local oscillator with the power signals through the frequency mixer to generate difference frequency, and the formed two paths of intermediate frequency signals with the bandwidth of 8GHz are amplified, frequency-selected and re-amplified through the main intermediate frequency amplifier, the band-pass filter and the low noise amplifier in sequence and then input to the high-speed digital acquisition system.
3. The spaceborne microwave radiometer according to claim 2, wherein the high-speed digital acquisition system divides each path of intermediate frequency signals with a bandwidth of 8GHz into 80 channels for output in different frequency bands; the bandwidth of all channels is 100 MHz.
4. The space-borne microwave radiometer according to claim 1, wherein the microwave receiving antenna comprises a flat mirror and a parabolic reflector, wherein the flat mirror reflects the received electromagnetic wave signal as a plane wave to the parabolic reflector by scanning the atmosphere and the calibration volume, and the parabolic reflector reflects the plane wave twice to the feed source.
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| CN108508421B (en) * | 2018-03-20 | 2020-04-14 | 中国科学院国家空间科学中心 | Radiometric ground detection test system and method |
| CN108535725A (en) * | 2018-04-08 | 2018-09-14 | 上海航天电子通讯设备研究所 | The microwave radiation detection method in the one-dimensional real aperture in the spaceborne one-dimensional aperture synthesis of multiband |
| CN110398785A (en) * | 2018-04-25 | 2019-11-01 | 中国科学院国家空间科学中心 | A kind of millimeter wave EO-1 hyperion atmospheric temperature detecting instrument and detection method |
| CN108874734B (en) * | 2018-04-25 | 2022-03-08 | 中国科学院国家空间科学中心 | Global land rainfall inversion method |
| CN111273276B (en) * | 2018-12-05 | 2024-07-16 | 核工业西南物理研究院 | Multi-channel microwave Doppler reflectometer based on self-excited oscillation microwave source |
| CN110658147B (en) * | 2019-09-24 | 2022-07-26 | 中国科学院国家空间科学中心 | Satellite-borne terahertz atmosphere limb detector |
| CN113010991B (en) * | 2019-12-20 | 2024-04-05 | 中国科学院国家空间科学中心 | Spectral radiometer system simulation and performance evaluation method |
| CN111551784B (en) * | 2020-05-18 | 2021-06-04 | 山东大学 | Solar radio radiometer and spectrum observation system and control method |
| CN112098437B (en) * | 2020-07-31 | 2024-05-31 | 西安空间无线电技术研究所 | Fine spectrum microwave radiometer system with adjustable channel parameters |
| CN112595731B (en) * | 2020-11-05 | 2022-07-26 | 中国科学院国家空间科学中心 | Configurable digital spectrometer for hyperspectral microwave radiometer |
| CN113156222B (en) * | 2021-04-21 | 2022-05-31 | 山东大学 | VHF observation system, array single machine system and method |
| CN113203480B (en) * | 2021-05-06 | 2022-05-27 | 上海航天电子通讯设备研究所 | Differential atmospheric water vapor delay measurement system and method |
| CN113390901B (en) * | 2021-05-08 | 2023-09-26 | 国家卫星气象中心(国家空间天气监测预警中心) | High vertical resolution 0-4km atmospheric temperature humidity microwave detector |
| CN113917546B (en) * | 2021-12-07 | 2024-05-31 | 西安空间无线电技术研究所 | Satellite-borne scanning type push-broom radiometer system based on feed source synthesis array |
| CN115308159B (en) * | 2022-07-29 | 2023-06-16 | 中国科学院紫金山天文台 | Omnidirectional measurement system for atmospheric water vapor radiation time-varying characteristics |
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| CN104569584B (en) * | 2013-10-09 | 2017-08-18 | 核工业西南物理研究院 | Ultra wide band frequency sweep microwave radiometer based on frequency doubling technology |
| CN104950171B (en) * | 2014-03-31 | 2018-02-13 | 核工业西南物理研究院 | A kind of multiple tracks wide-band microwave radiometer with self calibrating function |
| CN203798907U (en) * | 2014-03-31 | 2014-08-27 | 核工业西南物理研究院 | Multi-channel broadband microwave radiometer with self-calibration function |
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