CN210323204U - Multichannel K wave band radiometer receiver - Google Patents
Multichannel K wave band radiometer receiver Download PDFInfo
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- CN210323204U CN210323204U CN201920478593.0U CN201920478593U CN210323204U CN 210323204 U CN210323204 U CN 210323204U CN 201920478593 U CN201920478593 U CN 201920478593U CN 210323204 U CN210323204 U CN 210323204U
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Abstract
The utility model discloses a multichannel K wave band radiometer receiver, input signal put unit, multichannel merit through directional coupler, K 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 K frequency channel low noise is put the unit and is guaranteed the low noise and put the gain, 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 K wave band radiometer receiver.
Background
A multi-channel K-band radiometer receiver is a meteorological observation device based on a passive atmospheric microwave remote sensing technology, and realizes the detection of atmospheric humidity by receiving and processing the downlink radiation energy of a water vapor molecular absorption band with the frequency of 22 GHz-32 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 K wave band radiometer receiver adopts K 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 K-band radiometer receiver electrically connected in sequence from a signal input terminal to a signal output terminal: the device comprises a directional coupler, a K-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 K frequency band low-noise amplifying unit is a low-noise amplifying circuit; the low-noise discharge circuit comprises a plurality of cascaded low-noise amplification chips;
the input and output of the K-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 2069-99F;
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 a low-noise discharging circuit, and the structure of the low-noise discharging circuit of the compensation amplifying circuit is the same as that of the low-noise discharging circuit of the K-frequency band low-noise discharging unit;
and each output of the multi-path power division filter circuit is connected with the compensation amplifying circuit.
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 AV70303 in model number.
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 then enters the K-band low-noise amplification unit after being coupled with the directional coupler through the PIN switch 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 switching diode.
The output end of the directional coupler is connected with an isolator firstly and then connected with the K frequency band low-noise amplifier unit.
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 design requirement of multichannel K wave band radiometer receiver.
(2) The utility model discloses in, adopt K frequency channel low noise to put the unit and guarantee that the low noise puts the gain, the multichannel merit divides the filtering 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 K-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 K wave band radiometer receiver, the receiver includes: the device comprises a directional coupler 1, a K-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 by a K-band feed source, namely a K-band antenna, sequentially passes through a directional coupler 1, a K-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, multi-path video voltage is 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 K-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 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 22-32 GHz signal, received from a K-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, the isolation degree is greater than 30dB or less than-30 dB, and 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 K frequency band low noise amplifier unit 2; the isolator is used for improving isolation and preventing signal interference.
The K frequency band low noise amplifier unit 2 is a low noise amplifier circuit; the low-noise discharge circuit comprises a plurality of cascaded low-noise amplification chips; the input and output of the K-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 CHA2069-99F, and the producer is UMS, and this chip gain is 22dB in the working frequency channel, and the noise figure is 2.5dB, and output P-1 is 10dBm, 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, the standing wave of the port in the bandwidth required by 22 GHz-31.5 GHz is less than 20dB, the in-band insertion loss is less than 0.05dB, and energy conversion among different structures can be well performed.
And the output end of the K-frequency-band low-noise amplifying 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 the 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 the 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. The utility model discloses in, filter circuit 3 is divided for seven ways merit to the multichannel merit, and wherein, the wave filter bandwidth of each passageway is 230 MHz. 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 a low-noise amplifying circuit, and the low-noise amplifying circuit in the compensation amplifying circuit 4 has the same structure as the low-noise amplifying circuit in the K-band low-noise amplifying unit, that is, the compensation amplifying circuit 4 is also two cascaded low-noise amplifying chips and is the same as the low-noise amplifying chip of the K-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 has a model of AV70303, a manufacturer of the square law detector is a medium electric 41 station, and the voltage sensitivity of the square law detector is 0.35mv/uw, which meets design requirements and realizes a 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 av1660, a manufacturer is a medium-voltage 41 station, 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 is a preferred embodiment of the present invention, and should not be construed as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A multi-channel K-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 K-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. A multi-channel K-band radiometer receiver according to claim 1, characterized in that the K-band low noise amplifier unit (2) is a low noise amplifier circuit; the low-noise discharge circuit comprises a plurality of cascaded low-noise amplification chips;
the input and output of the K-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 receiver of claim 2, wherein the low noise discharge circuit comprises two cascaded low noise amplification chips; the model of the low-noise amplification chip is CHA 2069-99F;
the waveguide interface adopts a BJ620 standard waveguide port.
4. A multi-channel K-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 K-band radiometer receiver according to claim 4, characterized in that the compensation amplification circuit (4) is also a low noise discharge circuit, and the low noise discharge circuit of the compensation amplification circuit (4) and the low noise discharge circuit of the K-band low noise discharge unit have the same structure;
each output of the multi-path power division filter circuit (3) is connected with the compensation amplifying circuit (4).
6. A multi-channel K-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 AV70303 in model number.
7. A multi-channel K-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 the input signal enters the K-band low-noise amplification unit (2) after being coupled with the directional coupler (1) through the PIN switch (8) in sequence.
8. The receiver of claim 7, wherein the directional coupler (1) is a branched waveguide coupler, and is formed by coupling two parallel transmission lines via a plurality of branches, and the lengths and the intermediate distances of the branches are 1/4 waveguide wavelengths on the center frequency.
9. A multi-channel K-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 switching diode.
10. A multi-channel K-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 K-band low noise amplifier unit (2).
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| CN201920478593.0U CN210323204U (en) | 2019-04-10 | 2019-04-10 | Multichannel K wave band radiometer receiver |
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| CN201920478593.0U CN210323204U (en) | 2019-04-10 | 2019-04-10 | Multichannel K wave band radiometer receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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