CN218584987U - Dual-waveband parallel multi-channel millimeter wave receiving system of microwave radiometer - Google Patents
Dual-waveband parallel multi-channel millimeter wave receiving system of microwave radiometer Download PDFInfo
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- CN218584987U CN218584987U CN202222937626.8U CN202222937626U CN218584987U CN 218584987 U CN218584987 U CN 218584987U CN 202222937626 U CN202222937626 U CN 202222937626U CN 218584987 U CN218584987 U CN 218584987U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a double-waveband parallel multichannel millimeter wave receiving system of a microwave radiometer, which comprises a K waveband parallel multichannel receiver and a V waveband parallel multichannel receiver, wherein the K waveband parallel multichannel receiver and the V waveband parallel multichannel receiver both comprise an isolator, a low-noise amplification power division module, a directional coupler, a noise source, a filter and a detection audio amplification filter circuit; the utility model has the advantages that: the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver are integrated on the multi-channel microwave radiometer, so that the dual-band parallel multi-channel receiving of the microwave radiometer can be realized, and the inversion timeliness of the microwave radiometer is improved; compared with the microwave radiometer of the existing frequency mixing receiving system, the microwave radiometer does not need to receive local oscillation, can reduce the complexity and cost of the system and improve the reliability of the system.
Description
Technical Field
The utility model belongs to the technical field of the microwave radiometer, concretely relates to parallel multichannel millimeter wave receiving system of two wave bands of microwave radiometer.
Background
The microwave radiometer is mainly applied to the field of atmospheric remote sensing detection, and realizes remote sensing detection and inversion of atmospheric temperature and humidity profile and other parameters by passively detecting the radiation information of the atmosphere in two wave bands of K (22-31 GHz) and V (51-59 GHz); the dual-band receiver is used as a core subsystem of the microwave radiometer, and the performance of the dual-band receiver directly determines the detection precision of the radiometer; the existing microwave radiometer mostly adopts a working system of down-conversion single-channel receiving detection, frequency points are switched through local oscillation scanning, the whole working bandwidth is traversed, and a certain time period needs to be consumed, so that the defect of insufficient timeliness exists.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a parallel multichannel millimeter wave receiving system of dual waveband of microwave radiometer solves the problem that the timeliness is not enough for current microwave radiometer mixing receiving system, need not to receive the local oscillator simultaneously, but the complexity and the cost of reducible system improve system reliability.
In order to achieve the above object, the utility model provides a following technical scheme: a dual-band parallel multichannel millimeter wave receiving system of a microwave radiometer is characterized in that a received weak signal is subjected to low-noise amplification, after power division, filtering is carried out according to two received band frequency channels, square-law detection is finally carried out to generate a video signal, and the video signal is sent to a digital acquisition unit to obtain a dual-band parallel multichannel millimeter wave receiver; the method is realized by the following steps:
determining the composition of a dual-band parallel multi-channel receiver;
a dual-band multi-channel parallel receiver applied to a microwave radiometer comprises a K-band parallel multi-channel receiver and a V-band parallel multi-channel receiver, wherein each band receiver comprises an isolator, a low-noise amplification power division module, a directional coupler, a noise source, a filter bank and a detection audio amplification filter circuit;
determining the design of a low-noise amplification power division module;
the low-noise amplification power division module comprises a low-noise amplifier, a power divider circuit and an attenuator; the low noise amplifiers are connected in a cascade mode, and gain adjustment is carried out between each two low noise amplifiers through the attenuator; the power divider circuit adopts a three-stage 1-to-2 power divider, divides the two-waveband signal power amplified by the low-noise amplifier into 8 paths of output and sends the output to a filter bank;
determining the design of a filter bank;
the filter bank selects 8 filters with different working frequency points and different bandwidths for each wave band according to the working ranges of the K wave band and the V wave band to form a filter bank, and the filter bank outputs an input two-wave-band signal after filtering and grouping the input two-wave-band signal and sends the input two-wave-band signal to a detection audio amplification filter circuit;
determining the design of a detection audio amplification filter circuit;
the detection audio amplification circuit mainly comprises a detector, an audio amplification circuit, an active filter circuit and the like, wherein the detector carries out square law detection on K and V dual-band radio-frequency signals to generate audio signals, and the audio signals are amplified and output through low-pass filtering by the operational amplifier and sent to the digital acquisition unit.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver are integrated on the multi-channel microwave radiometer, so that the dual-band parallel multi-channel receiving of the microwave radiometer can be realized, and the inversion timeliness of the microwave radiometer is improved;
2. compared with the microwave radiometer of the existing frequency mixing receiving system, the microwave radiometer does not need to receive local oscillators, can reduce the complexity and cost of the system and improve the reliability of the system;
3. the low-noise amplification power division module, the filter bank and the detection audio amplification filter circuit are in modular design, so that the debugging difficulty is reduced, and the system maintainability is improved.
Drawings
FIG. 1 is a circuit diagram of the K, V dual-band parallel multi-channel millimeter wave receiver of the present invention;
fig. 2 is a diagram of the detection audio amplifier circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Example 1
Please refer to fig. 1 and fig. 2, for the first embodiment of the present invention, this embodiment provides a dual-band parallel multi-channel millimeter wave receiving system of microwave radiometer, which includes a K-band parallel multi-channel receiver and a V-band parallel multi-channel receiver, wherein the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver all include an isolator, a low-noise amplification power division module, a directional coupler, a noise source, a filter, and a detection audio amplification filter circuit.
In this embodiment, preferably, the low-noise amplification power dividing module includes a low-noise amplifier, a power divider circuit, and an attenuator; the low noise amplifiers are connected in a cascade mode, and gain adjustment is carried out between all levels of low noise amplifiers through attenuators.
In this embodiment, preferably, the power divider circuit adopts a three-stage 1-to-2 power divider to divide the dual-band signal amplified by the low noise amplifier into 8 paths of output.
In this embodiment, preferably, the detection audio amplifying circuit mainly includes a detector, an audio amplifying circuit, and an active filter circuit, where the detector performs square-law detection on the radio frequency signals in the K and V bands to generate audio signals, and the audio signals are amplified by the operational amplifier and output by low-pass filtering, and then are sent to the digital acquisition unit.
In this embodiment, preferably, the noise signal output by the noise source is coupled to the main channel through the directional coupler for processing.
In this embodiment, preferably, the filter selects 8 filters with different working frequency points and different bandwidths for each band according to the range of the two bands to form a filter bank, and performs filtering grouping on the input two-band signals and then outputs the two-band signals.
The utility model discloses a theory of operation and use flow: K. the V dual-band parallel multi-channel millimeter wave receiver adopts a multi-channel parallel detection receiving mode, weak noise signals received by an antenna are transmitted to the millimeter wave parallel receiver through a waveguide, the signals are filtered and output through 8 corresponding groups of filters after being divided by a waveguide directional coupler, an isolator and low-noise amplification power, voltage signals in direct proportion to input power are generated by the filtered millimeter wave noise signals through a square law detector, and then the millimeter wave noise signals are subjected to video filtering and amplification, are subjected to AD sampling quantization and are converted into digital forms to be processed.
Example 2
Referring to fig. 1 and fig. 2, a second embodiment of the present invention is based on the previous embodiment, except that:
the fault detection device is connected with the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver, and when the K-band parallel multi-channel receiver or the V-band parallel multi-channel receiver fails, the fault detection device is used for reporting faults, so that workers can conveniently and timely overhaul and maintain the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver, and normal work of the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver is guaranteed.
Example 3
Referring to fig. 1 and fig. 2, a third embodiment of the present invention is based on the previous embodiment, except that:
the device also comprises a terminal connected with the K wave band parallel multi-channel receiver, the V wave band parallel multi-channel receiver and the fault detection device, and the working states of the K wave band parallel multi-channel receiver, the V wave band parallel multi-channel receiver and the fault detection device can be checked through the terminal.
Although embodiments of the present invention have been shown and described, and in particular with reference to the above detailed description, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a parallel multichannel millimeter wave receiving system of dual-waveband of microwave radiometer which characterized in that: the multi-channel receiver comprises a K-band parallel multi-channel receiver and a V-band parallel multi-channel receiver, wherein the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver respectively comprise an isolator, a low-noise amplification power division module, a directional coupler, a noise source, a filter and a detection audio amplification filter circuit.
2. The dual-band parallel multi-channel millimeter wave receiving system of a microwave radiometer as recited in claim 1, wherein: the low-noise amplification power division module comprises a low-noise amplifier, a power divider circuit and an attenuator; the low noise amplifiers are connected in a cascade mode, and gain adjustment is carried out between all levels of low noise amplifiers through attenuators.
3. The dual-band parallel multi-channel millimeter wave receiving system of a microwave radiometer as recited in claim 2, wherein: the power divider circuit adopts a three-stage 1-to-2 power divider.
4. The dual-band parallel multi-channel millimeter wave receiving system of a microwave radiometer as recited in claim 1, wherein: the detection audio amplification circuit mainly comprises a detector, an audio amplification circuit and an active filter circuit.
5. The dual-band parallel multi-channel millimeter wave receiving system of the microwave radiometer as recited in claim 1, wherein: and a noise signal output by the noise source is coupled to the main channel through the directional coupler.
6. The dual-band parallel multi-channel millimeter wave receiving system of a microwave radiometer as recited in claim 1, wherein: the filter selects 8 filters with different working frequency points and different bandwidths from each wave band according to the range of the two wave bands to form a filter bank.
7. The dual-band parallel multi-channel millimeter wave receiving system of a microwave radiometer as recited in claim 1, wherein: the fault detection device is connected with the K-band parallel multi-channel receiver and the V-band parallel multi-channel receiver.
8. The dual-band parallel multi-channel millimeter wave receiving system of a microwave radiometer as defined in claim 7, wherein: the system also comprises a terminal connected with the K-band parallel multi-channel receiver, the V-band parallel multi-channel receiver and the fault detection device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222937626.8U CN218584987U (en) | 2022-11-04 | 2022-11-04 | Dual-waveband parallel multi-channel millimeter wave receiving system of microwave radiometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222937626.8U CN218584987U (en) | 2022-11-04 | 2022-11-04 | Dual-waveband parallel multi-channel millimeter wave receiving system of microwave radiometer |
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| Publication Number | Publication Date |
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| CN218584987U true CN218584987U (en) | 2023-03-07 |
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| CN202222937626.8U Active CN218584987U (en) | 2022-11-04 | 2022-11-04 | Dual-waveband parallel multi-channel millimeter wave receiving system of microwave radiometer |
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