CN112098437B - Fine spectrum microwave radiometer system with adjustable channel parameters - Google Patents
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Abstract
The invention discloses a fine spectrum microwave radiometer system with adjustable channel parameters, which comprises: the antenna subsystem is used for controlling conical scanning of the antenna and converting received microwave signals into signals with different frequency bands to be output; the receiver subsystem is used for carrying out detection acquisition or spectrum subdivision processing on the received signals of each frequency band and outputting remote sensing data of each channel; the comprehensive processor is used for transmitting the remote sensing data output by the receiver subsystem to the satellite platform; and receiving a control instruction of the satellite platform, and completing control of the fine spectrum microwave radiometer system with adjustable channel parameters according to the control instruction. The method has the characteristics of multiple channels, high spectrum resolution and the like, and the detection precision of the vertical temperature and humidity profile of the atmosphere is obviously improved; and the channel parameters can be timely adjusted according to application requirements, so that the method has strong flexibility and adaptability.
Description
Technical Field
The invention belongs to the technical field of space microwave remote sensing, and particularly relates to a fine spectrum microwave radiometer system with adjustable channel parameters.
Background
The development of national economy and society has increasingly high requirements for weather service, especially weather forecast. Accuracy and refinement of weather forecast are important points of attention for the state and people. The atmospheric temperature and humidity profile is an essential parameter describing the thermodynamic and dynamic states of the atmosphere, and provides boundary conditions for driving an aerodynamic model for numerical weather forecast. The more accurate atmospheric temperature and humidity profile can improve the numerical weather forecast precision, has important significance for weather forecast and weather change research, and has immeasurable value for countries with various weather patterns and frequent disastrous weather in China.
At present, a satellite-borne hyperspectral infrared detector and a microwave radiometer are important remote sensing means for detecting atmospheric temperature and humidity profile, are important remote sensing loads of meteorological satellites, but have respective defects: (1) The hyperspectral infrared detector is easily affected by cloud layers and rain areas, has low detection precision under the conditions of high water vapor content and cloud liquid water, and has certain limitation; (2) Although the traditional microwave radiometer can work all day and time, the traditional microwave radiometer is limited by the smaller number of channels, the traditional microwave radiometer cannot meet the requirements of higher and higher atmospheric detection precision (especially vertical resolution), and the system structure for realizing intermediate frequency processing by adopting the traditional simulation mode also determines that the parameters of the system channels cannot be further adjusted once being determined.
Disclosure of Invention
The technical solution of the invention is as follows: the system has the characteristics of multiple channels, high spectrum resolution and the like, and the detection precision of the vertical temperature and humidity profile of the atmosphere is remarkably improved; and the channel parameters can be timely adjusted according to application requirements, so that the method has strong flexibility and adaptability.
In order to solve the technical problems, the invention discloses a fine spectrum microwave radiometer system with adjustable channel parameters, which comprises:
The antenna subsystem is used for controlling conical scanning of the antenna and converting received microwave signals into signals with different frequency bands to be output;
the receiver subsystem is used for carrying out detection acquisition or spectrum subdivision processing on the received signals of each frequency band and outputting remote sensing data of each channel;
The comprehensive processor is used for transmitting the remote sensing data output by the receiver subsystem to the satellite platform; and receiving a control instruction of the satellite platform, and completing control of the fine spectrum microwave radiometer system with adjustable channel parameters according to the control instruction.
In the fine spectrum microwave radiometer system with adjustable channel parameters, a thermal calibration source body and a calibration source controller;
The calibration source controller is used for receiving a temperature control instruction output by the comprehensive processor and controlling the temperature of the thermal calibration source body according to the temperature control instruction; and measuring the temperature of the heat calibration source body in real time, and feeding back the temperature measurement result to the comprehensive processor.
In the above-mentioned fine-band microwave radiometer system with adjustable channel parameters, the antenna subsystem comprises: an antenna, a scanning mechanism and a servo controller;
An antenna, comprising: plane reflecting mirror, parabolic reflecting mirror and quasi-optical feeding network; when the antenna performs variable-speed circumferential scanning, the plane reflecting mirror rotates around the axis of the feed source, and the parabolic reflecting mirror is fixed;
The servo controller is used for driving the antenna to perform variable-speed circumferential scanning through the scanning mechanism;
And the quasi-optical feed network is used for carrying out frequency separation on the microwave signals received by the plane reflector and converting the microwave signals into four groups of signals with different frequency bands to be output.
In the fine spectrum microwave radiometer system with adjustable channel parameters, four groups of signals with different frequency bands output by the quasi-optical feed network are as follows: 50-60 GHz band signals, 89GHz band signals, 118.75GHz band signals and 183.31GHz band signals; the 50-60 GHz frequency band signal and the 118.75GHz frequency band signal are oxygen absorption bands and are used for atmospheric temperature profile detection; the 183.31GHz frequency band signal is a water vapor absorption band and is used for atmospheric humidity profile detection; the 89GHz frequency band signal is an air window area channel and is used for detecting background microwave radiation of the ground surface and assisting in atmospheric temperature profile detection and atmospheric humidity profile detection.
In the fine spectrum microwave radiometer system with adjustable channel parameters, when the integrated processor transmits the remote sensing data output by the receiver subsystem to the satellite platform, the integrated processor comprises:
Remote sensing data output by the receiver subsystem;
Receiving a temperature measurement result output by the calibration source controller;
Acquiring angle information of circumferential scanning of the antenna for speed change through a servo controller;
And (5) carrying out row packing on the remote sensing data, the temperature measurement result and the angle information, and sending the remote sensing data, the temperature measurement result and the angle information to a satellite platform.
In the above-described fine-band microwave radiometer system with adjustable channel parameters, the receiver subsystem comprises:
The radio frequency receiver I is used for receiving the 50-60 GHz frequency band signals, performing low-noise amplification and mirror phase suppression filtering treatment on the 50-60 GHz frequency band signals, and converting the 50-60 GHz frequency band signals into intermediate frequency signals I and outputting the intermediate frequency signals I;
The intermediate frequency receiver I is used for amplifying the intermediate frequency signal I and dividing the amplified intermediate frequency signal I into 5 paths of signals, respectively filtering and performing secondary down-conversion treatment on the 5 paths of signals after the power division, and outputting 5 paths of down-conversion treatment signals I with the bandwidth of 2 GHz;
the radio frequency receiver II is used for receiving the 183.31GHz frequency band signal, performing low-noise amplification and mirror phase inhibition filtering treatment on the 183.31GHz frequency band signal, and converting the 183.31GHz frequency band signal into an intermediate frequency signal II and outputting the intermediate frequency signal II;
the intermediate frequency receiver II is used for amplifying the intermediate frequency signal II and dividing the amplified intermediate frequency signal II into 5 paths of signals, respectively filtering and performing secondary down-conversion treatment on the 5 paths of signals after the power division, and outputting 5 paths of down-conversion treatment signals II with the bandwidth of 2 GHz;
The frequency spectrum subdivision receiver is used for carrying out FFT processing on 5 paths of down-conversion processing signals I with the bandwidth of 2GHz in parallel, subdividing the signals into 5MHz, and outputting 2048 paths of remote sensing data I of subdivision channels; performing FFT processing on 5 paths of down-conversion processing signals II with the bandwidth of 2GHz in parallel, subdividing the signals into 5MHz, and outputting remote sensing data II of 2048 paths of subdivision channels;
the receiver I is used for receiving the 89GHz frequency band signal, and outputting direct-current voltage I after low-noise amplification, filtering and detection processing of the 89GHz frequency band signal;
The receiver II is used for receiving 118.31GHz frequency band signals, and outputting direct-current voltage II after low-noise amplification, filtering and detection processing are carried out on 118.31GHz frequency band signals;
the information collector is used for respectively carrying out bias amplification on the direct-current voltage I and the direct-current voltage II, and then sending the direct-current voltage I and the direct-current voltage II to the comprehensive processor through the asynchronous serial data bus after AD sampling.
In the fine-band microwave radiometer system with adjustable channel parameters,
The intermediate frequency receiver I amplifies an intermediate frequency signal I and then divides the power into 5 paths of signals, and the signal comprises: 6.5-8.5 GHz frequency band signals, 8.5-10.5 frequency band signals, 10.5-12.5 frequency band signals, 12.5-14.5 frequency band signals and 14.5-16.5 frequency band signals;
The intermediate frequency receiver II amplifies the intermediate frequency signal II and then divides the power into 5 paths of signals, comprising: 6.5-8.5 GHz frequency band signals, 8.5-10.5 frequency band signals, 10.5-12.5 frequency band signals, 12.5-14.5 frequency band signals and 14.5-16.5 frequency band signals.
In the fine spectrum microwave radiometer system with adjustable channel parameters, the integrated processor is further configured to:
According to the remote sensing data I, the remote sensing data II and the AD sampling result of the information collector, the subdivision bandwidth of the fine spectrum microwave radiometer system with the adjustable channel parameters is adjusted so as to balance the subdivision quantity of the channels and the channel sensitivity.
In the fine spectrum microwave radiometer system with adjustable channel parameters, the quasi-optical feed network is used for:
the microwave signals received by the plane reflecting mirror are separated into a first group of microwave signals and a second group of microwave signals through the polarization grid mesh; wherein the first set of microwave signals comprises: 50-60 GHz band signals and 118.75GHz band signals, the second set of microwave signals comprising: 89GHz band signals and 183.31GHz band signals;
Frequency separating the first set of microwave signals by a frequency selective filter fss#1; wherein 118.31GHz frequency band signals are completely transmitted to enter a radio frequency receiver II through a frequency selective filter FSS#1, and 50-60 GHz frequency band signals are completely reflected to enter a radio frequency receiver I;
Frequency separating the second set of microwave signals by a frequency selective filter fss#2; the 89GHz frequency band signal is completely transmitted through the frequency selective filter FSS#2 to enter the receiver I, and the 118.31GHz frequency band signal is completely reflected to enter the receiver II.
In the above-mentioned fine-band microwave radiometer system with adjustable channel parameters, the microwave signal includes: a microwave signal of the target, a microwave signal of the heat source and a microwave signal of the cold air radiation.
The invention has the following advantages:
(1) The spectrum subdivision receiver adopts a digital FFT mode to realize ultra-wideband spectrum subdivision technology, can realize 2048-channel spectrum subdivision, has spectrum resolution up to 5MHz, is superior to foreign like products, and can meet the requirements of higher and higher atmospheric detection precision.
(2) The channel parameters of the spectrum subdivision receiver can be timely adjusted according to application requirements, the spectrum subdivision receiver has strong flexibility and adaptability, and the atmospheric temperature and humidity profile detection precision under different weather conditions can be improved.
(3) The spectrum subdivision receiver adopts an ADC+FPGA framework, and the FPGA has the capability of parallel data processing, so that the framework has more advantages in a high-speed data acquisition system, and simultaneously, the real-time receiving and processing of acquired data and the control of peripheral circuits can be realized.
(4) The four frequency bands share one pair of antenna reflecting surfaces, signals in different frequency bands are separated through a quasi-optical feed network, and the quasi-optical feed network comprises a polarization grid and a frequency selective filter, so that homologous observation in different frequency bands is realized.
(5) By adopting the integrated design, the device has light weight and small volume, can simultaneously meet the detection requirements of an atmospheric temperature profile and a humidity profile, and meets the carrying requirements of a small satellite platform.
Drawings
FIG. 1 is a block diagram of a fine-band microwave radiometer system with adjustable channel parameters in accordance with an embodiment of the invention;
fig. 2 is a schematic diagram of an antenna frequency separation scheme according to an embodiment of the present invention;
FIG. 3 is a block diagram of a 50-60 GHz RF receiver in accordance with an embodiment of the invention;
fig. 4 is a block diagram of a spectrum subdivision receiver in accordance with an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention disclosed herein will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, in this embodiment, the fine-band microwave radiometer system with adjustable channel parameters includes: an antenna subsystem, a receiver subsystem, a comprehensive processor, a thermal calibration source and a calibration source controller.
And the antenna subsystem is used for controlling conical scanning of the antenna and converting the received microwave signals into signals with different frequency bands and outputting the signals.
In this embodiment, the received microwave signal may specifically include: a microwave signal of the target, a microwave signal of the heat source and a microwave signal of the cold air radiation.
Preferably, the antenna subsystem may specifically include: an antenna, a scanning mechanism, and a servo controller. Further, the antenna may include: plane reflecting mirror, parabolic reflecting mirror and quasi-optical feeding network; when the antenna performs variable-speed circumferential scanning, the plane reflector rotates around the feed source axis, the parabolic reflector is fixed, and corresponding technical measures are taken to ensure that the antenna main beam efficiency is high enough, the level of antenna side lobes is reduced, and the calibration precision is improved. The servo controller is used for driving the antenna to perform variable-speed circumferential scanning through the scanning mechanism; and the quasi-optical feed network is used for carrying out frequency separation on the microwave signals received by the plane reflector and converting the microwave signals into four groups of signals with different frequency bands to be output. The signals of four groups of different frequency bands output by the quasi-optical feed network can be: 50-60 GHz band signal, 89GHz band signal, 118.75GHz band signal and 183.31GHz band signal. The 50-60 GHz frequency band signal and the 118.75GHz frequency band signal are oxygen absorption bands and are used for atmospheric temperature profile detection; the 183.31GHz frequency band signal is a water vapor absorption band and is used for atmospheric humidity profile detection; the 89GHz frequency band signal is an air window area channel and is used for detecting background microwave radiation of the ground surface and assisting in atmospheric temperature profile detection and atmospheric humidity profile detection. The 50-60 GHz frequency band signal and the 183.31GHz frequency band signal can be further subjected to frequency spectrum subdivision in a subsequent receiver subsystem, so that the detection precision of temperature and humidity profiles on all levels of the atmosphere is improved.
Preferably, as shown in fig. 2, the quasi-optical feeding network may be specifically used for:
The microwave signals received by the plane reflecting mirror are separated into a first group of microwave signals and a second group of microwave signals through the polarization grid mesh; wherein the first set of microwave signals comprises: 50-60 GHz band signals and 118.75GHz band signals, the second set of microwave signals comprising: 89GHz band signal and 183.31GHz band signal.
Frequency separating the first set of microwave signals by a frequency selective filter fss#1; wherein 118.31GHz frequency band signals are completely transmitted to enter the radio frequency receiver II through the frequency selective filter FSS#1, and 50-60 GHz frequency band signals are completely reflected to enter the radio frequency receiver I.
Frequency separating the second set of microwave signals by a frequency selective filter fss#2; the 89GHz frequency band signal is completely transmitted through the frequency selective filter FSS#2 to enter the receiver I, and the 118.31GHz frequency band signal is completely reflected to enter the receiver II.
And the receiver subsystem is used for carrying out detection acquisition or spectrum subdivision processing on the received signals of each frequency band and outputting remote sensing data of each channel.
In this embodiment, the receiver subsystem may specifically include: the system comprises a radio frequency receiver I, an intermediate frequency receiver I, a radio frequency receiver II, an intermediate frequency receiver II, a frequency spectrum subdivision receiver, a receiver I, a receiver II and an information collector.
Preferably, except for the receiver I, a direct detection type structure is adopted, and the rest channels all adopt a superheterodyne type structure. For two channels of 50-60 GHz and 183.31GHz, ultra-wideband radio frequency signals are subjected to low noise amplification and image rejection filtering, then subjected to down-conversion, power division, filtering and secondary down-conversion, and then sent to a spectrum subdivision receiver for spectrum subdivision processing. For 118.75GHz channel, the radio frequency signal is sequentially amplified by low noise, image rejection filtered, down-converted, divided by power, filtered, then detected, and then low-pass filtered to output DC voltage, and the AD conversion is carried out by the information collector. For 89GHz channel, direct detection type reception is adopted, no local oscillator and frequency converter are adopted, the radio frequency signal is directly amplified and filtered with low noise and then detected, then the direct current voltage is output through low-pass filtering, and the AD conversion is carried out by the information collector.
Preferably, the spectrum subdivision receiver is realized in a digital FFT mode, and is respectively processed on two channels of 50-60 GHz and 183.31GHz, each channel is designed to process signals with the bandwidth of 10GHz in parallel by using 5 paths of intermediate frequency processing modules, each path of intermediate frequency processing module is used for analyzing signals with the bandwidth of 2GHz in real time, the spectrum resolution can reach 5MHz, and meanwhile, the spectrum subdivision of 2048 channels can be realized. Furthermore, in order to meet the optimized channel parameter combination requirements under different observation scenes, simulation analysis and calculation can be performed on specific types of weather conditions, then parameters of the spectrum subdivision receiver are adjusted according to analysis results, and the bandwidth and the spectrum resolution are changed to obtain the optimal detection effect.
Specific:
50-60 GHz channel:
As shown in fig. 3, the radio frequency receiver I is configured to receive a 50-60 GHz band signal, perform low noise amplification and mirror phase suppression filtering on the 50-60 GHz band signal, and convert the 50-60 GHz band signal into an intermediate frequency signal I for output; and the intermediate frequency receiver I is used for amplifying the intermediate frequency signal I and dividing the amplified intermediate frequency signal I into 5 paths of signals, respectively filtering and performing secondary down-conversion processing on the 5 paths of signals after the power division, and outputting 5 paths of down-conversion processing signals I (0-2 GHz signals) with the bandwidth of 2 GHz. Wherein: the intermediate frequency receiver I amplifies the intermediate frequency signal I and then divides the power into 5 paths of signals respectively: 6.5-8.5 GHz frequency band signals, 8.5-10.5 frequency band signals, 10.5-12.5 frequency band signals, 12.5-14.5 frequency band signals and 14.5-16.5 frequency band signals.
183.31GHz channel:
The radio frequency receiver II is used for receiving the 183.31GHz frequency band signal, performing low-noise amplification and mirror phase inhibition filtering treatment on the 183.31GHz frequency band signal, and converting the 183.31GHz frequency band signal into an intermediate frequency signal II and outputting the intermediate frequency signal II. And the intermediate frequency receiver II is used for amplifying the intermediate frequency signal II and dividing the amplified intermediate frequency signal II into 5 paths of signals, respectively filtering and performing secondary down-conversion processing on the 5 paths of signals after the power division, and outputting 5 paths of down-conversion processing signals II (0-2 GHz signals) with the bandwidth of 2 GHz. The intermediate frequency receiver II amplifies the intermediate frequency signal II and then divides the amplified intermediate frequency signal II into 5 paths of signals: 6.5-8.5 GHz frequency band signals, 8.5-10.5 frequency band signals, 10.5-12.5 frequency band signals, 12.5-14.5 frequency band signals and 14.5-16.5 frequency band signals.
89GHz channel:
and the receiver I is used for receiving the 89GHz frequency band signal, and outputting direct-current voltage I after carrying out low-noise amplification, filtering and detection processing on the 89GHz frequency band signal.
118.31GHz channel:
And the receiver II is used for receiving 118.31GHz frequency band signals, and outputting direct-current voltage II after low-noise amplification, filtering and detection processing of 118.31GHz frequency band signals.
Further:
The frequency spectrum subdivision receiver is used for carrying out FFT processing on 5 paths of down-conversion processing signals I with the bandwidth of 2GHz in parallel, subdividing the signals into 5MHz, and outputting 2048 paths of remote sensing data I of subdivision channels; and performing FFT processing on the 5 paths of down-conversion processing signals II with the bandwidth of 2GHz in parallel, subdividing the signals into 5MHz, and outputting remote sensing data II of 2048 paths of subdivision channels.
The information collector is used for respectively carrying out bias amplification on the direct-current voltage I and the direct-current voltage II, and then sending the direct-current voltage I and the direct-current voltage II to the comprehensive processor through the asynchronous serial data bus after AD sampling.
The calibration source controller is used for receiving a temperature control instruction output by the comprehensive processor and controlling the temperature of the thermal calibration source body according to the temperature control instruction; and measuring the temperature of the heat calibration source body in real time, and feeding back the temperature measurement result to the comprehensive processor.
In this embodiment, the scaled source controller may communicate and data with the integrated processor via an asynchronous serial bus.
The comprehensive processor is used for transmitting the remote sensing data output by the receiver subsystem to the satellite platform; and receiving a control instruction of the satellite platform, and completing control of the fine spectrum microwave radiometer system with adjustable channel parameters according to the control instruction.
In this embodiment, the integrated processor is mainly responsible for completing communication between the fine spectrum microwave radiometer system with adjustable channel parameters and the satellite platform, and on one hand, uploading each data of the fine spectrum microwave radiometer system with adjustable channel parameters to the satellite platform, and on the other hand, receiving the downloaded data of the satellite platform; finally, the working state control of the fine spectrum microwave radiometer system with adjustable channel parameters and the exchange of information such as external remote sensing, remote control and the like are realized.
Preferably, when the integrated processor transmits the remote sensing data output by the receiver subsystem to the satellite platform, the integrated processor may specifically include: remote sensing data output by the receiver subsystem; receiving a temperature measurement result output by the calibration source controller; acquiring angle information of circumferential scanning of the antenna for speed change through a servo controller; and (5) carrying out row packing on the remote sensing data, the temperature measurement result and the angle information, and sending the remote sensing data, the temperature measurement result and the angle information to a satellite platform.
Preferably, the integrated processor can adjust the subdivision bandwidth of the fine spectrum microwave radiometer system with adjustable channel parameters according to the remote sensing data I, the remote sensing data II and the AD sampling result of the information collector so as to balance the channel subdivision quantity and the channel sensitivity, namely find a balance point between the channel subdivision quantity and the channel sensitivity, and ensure a certain channel sensitivity while meeting the channel subdivision quantity requirement.
In a preferred embodiment of the invention, as shown in fig. 4, the spectrum subdivision receiver adopts a time-interleaved parallel sampling architecture, comprising: the device comprises an analog input front end, an ADC, a multiphase clock generator, an FPGA responsible for data receiving and storing and a DSP performing data post-processing, and is used for subdividing the intermediate frequency signals. The analog input front end is responsible for converting an input single-ended analog signal into multiple paths of differential signals to be sent into each ADC, and the amplitude and the phase of each channel signal are consistent. The multiphase clock generator provides sampling clock signals with low jitter for the sampling array, and is also used for strictly controlling phase delay among sampling channels, the ADC and the FPGA form a high-speed sampling channel, and the DSP performs digital post-processing to finish channel mismatch error correction.
In summary, the invention provides a microwave radiometer system with adjustable channel parameters in a fine spectrum section, which works in four frequency bands of 50-60 GHz, 89GHz, 118.75GHz and 183.31GHz, wherein an ultra-wideband spectrum subdivision technology is adopted in two frequency bands of 50-60 GHz and 183.31GHz, and the microwave radiometer system has the characteristics of multiple channels, high spectrum resolution and the like, and the detection precision of the atmospheric vertical temperature and humidity profile is obviously improved. And the channel parameters can be timely adjusted according to application requirements, so that the method has strong flexibility and adaptability.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
What is not described in detail in the present specification belongs to the known technology of those skilled in the art.
Claims (5)
1. A fine-band microwave radiometer system with adjustable channel parameters, comprising:
The antenna subsystem is used for controlling conical scanning of the antenna and converting received microwave signals into signals with different frequency bands to be output; wherein, antenna subsystem includes: an antenna, a scanning mechanism and a servo controller; an antenna, comprising: plane reflecting mirror, parabolic reflecting mirror and quasi-optical feeding network; when the antenna performs variable-speed circumferential scanning, the plane reflector rotates around the axis of the feed source, and the parabolic reflector is fixed; the servo controller is used for driving the antenna to perform variable-speed circumferential scanning through the scanning mechanism; the quasi-optical feed network is used for carrying out frequency separation on microwave signals received by the plane reflector and converting the microwave signals into four groups of signals with different frequency bands to be output; the signals of four groups of different frequency bands output by the quasi-optical feed network are as follows: 50-60 GHz band signals, 89GHz band signals, 118.75GHz band signals and 183.31GHz band signals; the 50-60 GHz frequency band signal and the 118.75GHz frequency band signal are oxygen absorption bands and are used for atmospheric temperature profile detection; the 183.31GHz frequency band signal is a water vapor absorption band and is used for atmospheric humidity profile detection; the 89GHz frequency band signal is an air window area channel and is used for detecting background microwave radiation of the ground surface and assisting in atmospheric temperature profile detection and atmospheric humidity profile detection;
the receiver subsystem is used for carrying out detection acquisition or spectrum subdivision processing on the received signals of each frequency band and outputting remote sensing data of each channel; a receiver subsystem comprising: the radio frequency receiver I is used for receiving the 50-60 GHz frequency band signals, performing low-noise amplification and mirror phase suppression filtering treatment on the 50-60 GHz frequency band signals, and converting the 50-60 GHz frequency band signals into intermediate frequency signals I and outputting the intermediate frequency signals I; the intermediate frequency receiver I is used for amplifying the intermediate frequency signal I and dividing the amplified intermediate frequency signal I into 5 paths of signals, respectively filtering and performing secondary down-conversion treatment on the 5 paths of signals after the power division, and outputting 5 paths of down-conversion treatment signals I with the bandwidth of 2 GHz; the radio frequency receiver II is used for receiving the 183.31GHz frequency band signal, performing low-noise amplification and mirror phase inhibition filtering treatment on the 183.31GHz frequency band signal, and converting the 183.31GHz frequency band signal into an intermediate frequency signal II and outputting the intermediate frequency signal II; the intermediate frequency receiver II is used for amplifying the intermediate frequency signal II and dividing the amplified intermediate frequency signal II into 5 paths of signals, respectively filtering and performing secondary down-conversion treatment on the 5 paths of signals after the power division, and outputting 5 paths of down-conversion treatment signals II with the bandwidth of 2 GHz; the frequency spectrum subdivision receiver is used for carrying out FFT processing on 5 paths of down-conversion processing signals I with the bandwidth of 2GHz in parallel, subdividing the signals into 5MHz, and outputting 2048 paths of remote sensing data I of subdivision channels; performing FFT processing on 5 paths of down-conversion processing signals II with the bandwidth of 2GHz in parallel, subdividing the signals into 5MHz, and outputting remote sensing data II of 2048 paths of subdivision channels; the receiver I is used for receiving the 89GHz frequency band signal, and outputting direct-current voltage I after low-noise amplification, filtering and detection processing of the 89GHz frequency band signal; the receiver II is used for receiving 118.31GHz frequency band signals, and outputting direct-current voltage II after low-noise amplification, filtering and detection processing are carried out on 118.31GHz frequency band signals; the information collector is used for respectively carrying out bias amplification on the direct-current voltage I and the direct-current voltage II, and then sending the direct-current voltage I and the direct-current voltage II to the comprehensive processor through an asynchronous serial data bus after AD sampling; the intermediate frequency receiver I amplifies an intermediate frequency signal I and then divides the power into 5 paths of signals, and the signal comprises: 6.5-8.5 GHz frequency band signals, 8.5-10.5 frequency band signals, 10.5-12.5 frequency band signals, 12.5-14.5 frequency band signals and 14.5-16.5 frequency band signals; the intermediate frequency receiver II amplifies the intermediate frequency signal II and then divides the power into 5 paths of signals, comprising: 6.5-8.5 GHz frequency band signals, 8.5-10.5 frequency band signals, 10.5-12.5 frequency band signals, 12.5-14.5 frequency band signals and 14.5-16.5 frequency band signals;
The comprehensive processor is used for transmitting the remote sensing data output by the receiver subsystem to the satellite platform; receiving a control instruction of a satellite platform, and completing control of the fine spectrum microwave radiometer system with adjustable channel parameters according to the control instruction; and according to the remote sensing data I, the remote sensing data II and the AD sampling result of the information collector, the subdivision bandwidth of the fine spectrum microwave radiometer system with the adjustable channel parameters is adjusted so as to balance the channel subdivision quantity and the channel sensitivity.
2. The channel parameter adjustable fine band microwave radiometer system of claim 1, wherein the system further comprises: a thermal calibration source and a calibration source controller;
The calibration source controller is used for receiving a temperature control instruction output by the comprehensive processor and controlling the temperature of the thermal calibration source body according to the temperature control instruction; and measuring the temperature of the heat calibration source body in real time, and feeding back the temperature measurement result to the comprehensive processor.
3. The channel parameter adjustable fine band microwave radiometer system of claim 2, wherein the integrated processor, when transmitting the remote sensing data output by the receiver subsystem to the satellite platform, comprises:
Receiving remote sensing data output by a receiver subsystem;
Receiving a temperature measurement result output by the calibration source controller;
Acquiring angle information of circumferential scanning of the antenna for speed change through a servo controller;
And (5) carrying out row packing on the remote sensing data, the temperature measurement result and the angle information, and sending the remote sensing data, the temperature measurement result and the angle information to a satellite platform.
4. The channel parameter adjustable fine band microwave radiometer system of claim 1 wherein the quasi-optical feed network is configured to:
the microwave signals received by the plane reflecting mirror are separated into a first group of microwave signals and a second group of microwave signals through the polarization grid mesh; wherein the first set of microwave signals comprises: 50-60 GHz band signals and 118.75GHz band signals, the second set of microwave signals comprising: 89GHz band signals and 183.31GHz band signals;
Frequency separating the first set of microwave signals by a frequency selective filter fss#1; wherein 118.31GHz frequency band signals are completely transmitted to enter a radio frequency receiver II through a frequency selective filter FSS#1, and 50-60 GHz frequency band signals are completely reflected to enter a radio frequency receiver I;
Frequency separating the second set of microwave signals by a frequency selective filter fss#2; the 89GHz frequency band signal is completely transmitted through the frequency selective filter FSS#2 to enter the receiver I, and the 118.31GHz frequency band signal is completely reflected to enter the receiver II.
5. The fine-band microwave radiometer system with adjustable trace parameters as recited in claim 1, wherein the microwave signal comprises: a microwave signal of the target, a microwave signal of the heat source and a microwave signal of the cold air radiation.
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| 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 |
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