CN210243527U - Multichannel V wave band radiometer receiver - Google Patents
Multichannel V wave band radiometer receiver Download PDFInfo
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- CN210243527U CN210243527U CN201920478619.1U CN201920478619U CN210243527U CN 210243527 U CN210243527 U CN 210243527U CN 201920478619 U CN201920478619 U CN 201920478619U CN 210243527 U CN210243527 U CN 210243527U
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Abstract
The utility model discloses a multichannel V wave band radiometer receiver, input signal put unit, multichannel merit through directional coupler, V frequency channel low noise in proper order and divide filter circuit, compensation amplifier circuit, radio frequency detection circuit, video amplifier circuit, and final output multichannel video voltage supplies rear end sampling and digital signal processing to use. The utility model discloses a gain is put to the unit assurance low noise of V frequency channel low noise, and the multichannel merit is divided the filter circuit group and is realized the multichannel frequency division, and the mode output of the direct detection of radio frequency has reduced the partial factor of influence channel stability index, has improved microwave radiometer receiver equipment moving reliability and stability.
Description
Technical Field
The utility model belongs to the technical field of the microwave technique and specifically relates to a multichannel V wave band radiometer receiver.
Background
A multi-channel V-band radiometer receiver is a meteorological observation device based on a passive atmospheric microwave remote sensing technology, and realizes the detection of atmospheric temperature by receiving and processing the downlink radiation energy of an oxygen molecule absorption band with the frequency of 51 GHz-59 GHz.
In the prior art, a microwave radiometer receiver mainly has two ways to realize multi-channel observation: the first method is to carry out detection frequency scanning and multi-channel time-sharing observation through local vibration source frequency hopping and frequency conversion to fixed intermediate frequency; and the second mode is that a filter bank is adopted to realize multichannel frequency division and radio frequency direct detection to carry out multichannel simultaneous observation, and compared with the first swept-frequency microwave radiometer receiver, the multichannel parallel filter receiver has the advantages of more accurate observation, more stability and quicker observation, allows the simultaneous measurement of atmospheric temperature and humidity and reduces the measurement time to the maximum extent. However, the design methods of the microwave radiometer receiver in the prior art have the problem of instability.
SUMMERY OF THE UTILITY MODEL
In order to overcome above-mentioned prior art's defect, the utility model provides a multichannel V wave band radiometer receiver adopts the V frequency channel low noise to put the unit and guarantees the low noise and put the gain, and the multichannel merit is divided filter circuit group and is realized the multichannel frequency division, and the mode output of the direct detection of radio frequency has reduced the influence channel stability index part factor, has improved microwave radiometer receiver equipment moving reliability and stability.
In order to achieve the above object, the utility model adopts the following technical scheme, include:
a multi-channel V-band radiometer receiver electrically connected in sequence from a signal input to a signal output: the device comprises a directional coupler, a V-band low-noise amplifier unit, a multi-path power division filter circuit, a compensation amplifier circuit, a radio frequency detection circuit and a video amplifier circuit.
The V-band low-noise amplifier unit comprises two cascaded low-noise amplifier circuits; the low-noise discharge circuit comprises a plurality of cascaded low-noise amplification chips;
the input and output of the V-band low-noise amplifier unit are waveguide interfaces, and the conversion of the interface form is realized by adopting waveguide microstrip conversion.
The low-noise discharge circuit comprises two cascaded low-noise amplification chips; the model of the low-noise amplification chip is CHA 2159;
the waveguide interface adopts a BJ620 standard waveguide port.
The multi-path power division filter circuit adopts a mode that a plurality of waveguide filter duplexers are respectively cascaded with the waveguide H-T head; and an H-shaped mask coupling waveguide filter is adopted in the waveguide filtering duplexer.
The compensation amplifying circuit is also composed of two cascaded low-noise discharging circuits, and the low-noise discharging circuit of the compensation amplifying circuit and the low-noise discharging circuit of the V-band low-noise discharging unit have the same structure.
The radio frequency detection circuit is realized by adopting a square law detector, and the radio frequency detection circuit is connected behind each compensation amplification circuit and is used for directly detecting each path of signal; the square law detector is AV 82322.
The receiver also comprises a noise source and a PIN switch; the noise source, the PIN switch and the directional coupler are sequentially and electrically connected to form a calibration channel; the calibration channel simulates an input signal by using a noise source, and enters the V-band low-noise amplification unit after being coupled by the PIN switch and the directional coupler in sequence;
the directional coupler adopts a branch waveguide coupler and is formed by coupling two parallel transmission lines through a plurality of branch lines, and the length and the middle distance of the branch lines are 1/4 waveguide wavelengths on the central frequency.
The noise source adopts av16605 series as a calibration noise source; the PIN switch adopts an HPND-4028 switch diode, the insertion loss of the switch diode is less than 0.8dB, and the isolation is greater than 30 dB.
The output end of the directional coupler is connected with an isolator firstly and then connected with the V-band low-noise amplifier unit.
The multi-path power division filter circuit is a seven-path power division filter circuit, wherein the bandwidth of filters of f1, f2, f3 and f4 channels is 230MHz, and the filters are directly connected by using waveguide H-T junctions; the bandwidths of the filters of the f5, f6 and f7 channels are respectively 600MHz, 1000MHz and 2000MHz, and the filters are also connected by using waveguide H-T junctions, but the front ends, namely the input ends, of the filters of the f5, f6 and f7 channels are all connected with waveguide isolators.
The utility model has the advantages that:
(1) the utility model provides an each circuit design and the selection of each components and parts have all satisfied the designing requirement of multichannel V wave band radiometer receiver.
(2) The utility model discloses in, adopt the V frequency channel low noise to put the unit and guarantee that the low noise puts the gain, the multichannel merit divides the filter circuit group to realize that the multichannel is divided, and the mode output of the direct detection of radio frequency has reduced the influence and has influenced the partial factor of passageway stability index, has improved microwave radiometer receiver equipment moving reliability and stability.
(3) The utility model provides a video amplifier circuit is used for carrying out temperature compensation, because the Q value of square law detector does not reach the requirement of video output voltage, the event has increased video amplifier circuit after the detection and has carried out temperature compensation.
Drawings
Fig. 1 is an overall schematic diagram of the multi-channel V-band radiometer receiver of the present invention.
Fig. 2A is a schematic connection diagram of the multi-path power dividing filter circuit of the present invention.
Fig. 2B is a schematic diagram of the channel of the multi-path power division filter 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 accompanying 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 work belong to the protection scope of the present invention.
Shown by fig. 1, the utility model discloses a multichannel V wave band radiometer receiver, the receiver includes: the device comprises a directional coupler 1, a V-band low-noise amplification unit 2, a multi-path power division filter circuit 3, a compensation amplification circuit 4, a radio frequency detection circuit 5, a video amplification circuit 6, a noise source 7 and a PIN switch 8;
a signal received from a V-band feed source sequentially passes through a directional coupler 1, a V-band low-noise amplification unit 2, a multi-path power division filter circuit 3, a compensation amplification circuit 4, a radio frequency detection circuit 5 and a video amplification circuit 6, and finally, a plurality of paths of video voltages are output for rear-end sampling and digital signal processing application.
In order to meet the requirement of the characteristic calibration function of a microwave radiometer system, a calibration channel is designed for a receiver, and the calibration channel is formed by sequentially and electrically connecting a noise source 7, a PIN switch 8 and a directional coupler 1; the calibration channel simulates an input signal by using a noise source 7, sequentially couples the input signal with the directional coupler 1 through the PIN switch 8, then sequentially enters the V-band low-noise amplification unit 2, the multi-path power division filter circuit 3, the compensation amplification circuit 4, the radio frequency detection circuit 5 and the video amplification circuit 6, and finally outputs multi-path video voltages for rear-end sampling and digital signal processing application.
The directional coupler 1 adopts a branch waveguide coupler and is formed by coupling two parallel transmission lines through a plurality of branches, and the lengths of the branches and the intermediate distances of the branches are 1/4 waveguide wavelengths on the central frequency. One transmission line, namely a receiving end, of the directional coupler 1 is used for receiving an input signal, namely a 51-59GHz signal, received from a V-band feed source, and the other transmission line, namely a coupling end, of the directional coupler 1 is used for coupling an input signal simulated by a noise source 7. The coupling degree of the directional coupler 1 is greater than 15dB or less than-15 dB, and the isolation degree is greater than 30dB or less than-30 dB, so that the design requirement is met; in the embodiment, through modeling simulation, the standing wave of the port in the required bandwidth is less than-35 dB, the isolation is less than-35 dB, the coupling is less than-15 dB, and the fluctuation in the coupling band is less than 1.5 dB.
In the utility model, the output end of the directional coupler 1 is connected with an isolator first and then connected with the V-band low-noise amplifier unit 2; the isolator is used for improving isolation and preventing signal interference.
The V-band low-noise amplifier unit 2 comprises two cascaded low-noise amplifier circuits; the low-noise discharge circuit comprises a plurality of cascaded low-noise amplification chips; the input and output of the V-band low-noise amplifier unit 2 are waveguide interfaces, and the conversion of the interface form is realized by adopting waveguide microstrip conversion. The utility model discloses in, the model of low noise amplifier chip is CHA2159, and the producer is UMS, and this chip gain is 20dB in the working frequency channel, and noise figure is 4dB, and output P-1 is 14dBm, satisfies the designing requirement. In order to ensure that the low-noise amplification gain meets the requirement, the low-noise discharge circuit adopts two-stage low-noise amplification chip cascade connection, and a null circuit isolation measure is adopted between two stages, so that self-oscillation and unstable work caused by self positive feedback accumulation of the circuit can be avoided. The power supply connection of the front side and the back side adopts an EMI resistant feed-through filter terminal form to strengthen the isolation of a power supply channel. In the embodiment, through modeling simulation, standing waves of the port in a bandwidth required by 50 GHz-60 GHz are less than 20dB, and the in-band insertion loss is less than 0.05dB, so that energy conversion among different structures can be well performed.
And the output end of the V-band low-noise amplification unit 2 is connected with the multi-path power division filter circuit 3.
As shown in fig. 2A and fig. 2B, the multi-path power division filter circuit 3 adopts a manner that a plurality of waveguide filter duplexers are respectively cascaded with the waveguide H-T head; the input end of the waveguide filtering duplexer is connected with one waveguide H-T head, the output end of the waveguide filtering duplexer is connected with the other waveguide H-T head, and the other two ends of the two waveguide H-T heads are respectively connected with a low-noise amplifier; and because the relative bandwidth of the filter is narrow and not more than 1%, the filter is suitable for a filter with a waveguide diaphragm structure, and an H-shaped diaphragm coupling waveguide filter is adopted in the waveguide filtering duplexer. In the utility model, the multi-path power dividing filter circuit 3 is a seven-path power dividing filter circuit, wherein the filter bandwidths of the f1, f2, f3 and f4 channels are 230MHz, and can be directly connected by using waveguide H-T junctions; the bandwidths of the filters of the channels f5, f6 and f7 are respectively 600MHz, 1000MHz and 2000MHz, and because the channels interfere with each other, the front ends, namely the input ends, of the filters of the channels f5, f6 and f7 are all connected with waveguide isolators, the types of the isolators are XB-WI19-51-59, the manufacturers are the medium-voltage 41 houses, the working frequency of the isolators covers 51-59GHz, the isolation degree is greater than 15dB, the VSWR is less than 1.45, the insertion loss is less than 1dB, and the design requirements are met. And after the design of a single circuit is finished, designing the duplexer, and then carrying out multi-path duplex cascade modeling simulation.
The compensation amplifying circuit 4 is also two cascaded low-noise amplifying circuits, and the low-noise amplifying circuit in the compensation amplifying circuit 4 has the same structure as the low-noise amplifying circuit in the V-band low-noise amplifying unit 2, that is, the low-noise amplifying circuit in the compensation amplifying circuit 4 is also two cascaded low-noise amplifying chips and is the same as the low-noise amplifying chip in the V-band low-noise amplifying unit 2; each output of the multi-path power division filter circuit 3 is connected with the compensation amplifying circuit 4.
The radio frequency detection circuit 5 is realized by adopting a square law detector, and the radio frequency detection circuit 5 is connected behind each compensation amplification circuit 4 and is used for directly detecting each path of signal. In this embodiment, the square law detector is AV82322, and the manufacturer is a medium electric 41, and the voltage sensitivity thereof is 0.2mv/uw, which meets the design requirements and realizes the direct signal detection function of each channel.
The video amplifying circuit 6 is used for temperature compensation, and since the Q value of the square law detector does not meet the requirement of the video output voltage, each radio frequency detection circuit 5 is connected with the video amplifying circuit 6 and used for temperature compensation of the square law detector in each radio frequency detection circuit 5.
The noise source 7 adopts an av16605 series as a calibration noise source, the model of the noise source is av16605, a manufacturer is a medium-voltage 41 institute, the super-noise ratio is greater than 20dB, and the design requirement is met. The output end of the noise source 7 is connected with the PIN switch 8.
The PIN switch 8 adopts an HPND-4028 switch diode, the insertion loss of the switch diode is less than 0.8dB, the isolation is greater than 30dB, and the design requirement is met. The output terminal of the PIN switch 8 is connected to the coupling terminal of the directional coupler 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A multi-channel V-band radiometer receiver characterized in that the receiver is electrically connected in sequence from a signal input to a signal output: the device comprises a directional coupler (1), a V-band low-noise amplification unit (2), a multi-path power division filter circuit (3), a compensation amplification circuit (4), a radio frequency detection circuit (5) and a video amplification circuit (6).
2. The multi-channel V-band radiometer receiver of claim 1,
the V-band low-noise amplifier unit (2) is two cascaded low-noise amplifier circuits; the low-noise discharge circuit comprises a plurality of cascaded low-noise amplification chips;
the input and output of the V-band low-noise amplifier unit (2) are waveguide interfaces, and the conversion of the interface form is realized by adopting waveguide microstrip conversion.
3. The multi-channel V-band radiometer receiver of claim 2,
the low-noise discharge circuit comprises two cascaded low-noise amplification chips; the model of the low-noise amplification chip is CHA 2159;
the waveguide interface adopts a BJ620 standard waveguide port.
4. A multi-channel V-band radiometer receiver according to claim 3, characterized in that said multi-path power division filter circuit (3) employs a plurality of waveguide filter duplexers respectively cascaded with waveguide H-T headers; and an H-shaped mask coupling waveguide filter is adopted in the waveguide filtering duplexer.
5. A multi-channel V-band radiometer receiver according to claim 3, characterized in that the compensation amplification circuit (4) is also two cascaded low noise discharge circuits, and the low noise discharge circuit of the compensation amplification circuit (4) and the low noise discharge circuit of the V-band low noise discharge unit (2) have the same structure.
6. A multi-channel V-band radiometer receiver according to claim 5, characterized in that the RF detection circuit (5) is implemented by a square law detector, and each compensation amplifying circuit (4) is followed by the RF detection circuit (5) for direct detection of each signal; the square law detector is AV 82322.
7. A multi-channel V-band radiometer receiver according to claim 1, characterized in that the receiver further comprises a noise source (7), a PIN switch (8); the noise source (7), the PIN switch (8) and the directional coupler (1) are sequentially and electrically connected to form a calibration channel; the calibration channel simulates an input signal by using a noise source (7), and enters the V-band low-noise amplification unit (2) after being coupled with the directional coupler (1) through the PIN switch (8) in sequence;
the directional coupler (1) adopts a branch waveguide coupler and is formed by coupling two parallel transmission lines through a plurality of branch lines, and the lengths and the intermediate intervals of the branch lines are 1/4 waveguide wavelengths on the central frequency.
8. A multi-channel V-band radiometer receiver according to claim 7, characterized in that the noise source (7) employs the av16605 series as a calibration noise source; the PIN switch (8) adopts an HPND-4028 switch diode, the insertion loss of the switch diode is less than 0.8dB, and the isolation is greater than 30 dB.
9. A multi-channel V-band radiometer receiver according to claim 1 or 7, characterized in that the output of the directional coupler (1) is connected to an isolator before the V-band low noise amplifier unit (2).
10. The receiver of claim 4, wherein the multi-path power division filter circuit (3) is a seven-path power division filter circuit, wherein the filter bandwidths of the f1, f2, f3 and f4 channels are 230MHz and are directly connected by using a waveguide H-T junction; the bandwidths of the filters of the f5, f6 and f7 channels are respectively 600MHz, 1000MHz and 2000MHz, and the filters are also connected by using waveguide H-T junctions, but the front ends, namely the input ends, of the filters of the f5, f6 and f7 channels are all connected with waveguide isolators.
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| CN201920478619.1U CN210243527U (en) | 2019-04-10 | 2019-04-10 | Multichannel V wave band radiometer receiver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666636A (en) * | 2020-12-18 | 2021-04-16 | 西安空间无线电技术研究所 | Channel coupling performance test method of microwave radiometer spectrum subdivision receiver |
| CN113376505A (en) * | 2021-05-12 | 2021-09-10 | 中电科思仪科技股份有限公司 | Detection circuit and method suitable for rapid screening of microwave integrated circuit electrical performance |
| CN115425997A (en) * | 2022-09-02 | 2022-12-02 | 南京大劲精密机械有限公司 | V-band multi-channel receiver |
-
2019
- 2019-04-10 CN CN201920478619.1U patent/CN210243527U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666636A (en) * | 2020-12-18 | 2021-04-16 | 西安空间无线电技术研究所 | Channel coupling performance test method of microwave radiometer spectrum subdivision receiver |
| CN113376505A (en) * | 2021-05-12 | 2021-09-10 | 中电科思仪科技股份有限公司 | Detection circuit and method suitable for rapid screening of microwave integrated circuit electrical performance |
| CN113376505B (en) * | 2021-05-12 | 2022-06-21 | 中电科思仪科技股份有限公司 | Detection circuit and method suitable for rapid screening of electrical performance of microwave integrated circuit |
| CN115425997A (en) * | 2022-09-02 | 2022-12-02 | 南京大劲精密机械有限公司 | V-band multi-channel receiver |
| CN115425997B (en) * | 2022-09-02 | 2023-04-25 | 南京大劲精密机械有限公司 | V-band multichannel receiver |
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