CN207218679U - Receiving circuit for the measurement of S-band precipitation particles scattering experiment - Google Patents
Receiving circuit for the measurement of S-band precipitation particles scattering experiment Download PDFInfo
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- CN207218679U CN207218679U CN201720918954.XU CN201720918954U CN207218679U CN 207218679 U CN207218679 U CN 207218679U CN 201720918954 U CN201720918954 U CN 201720918954U CN 207218679 U CN207218679 U CN 207218679U
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Abstract
The utility model discloses a kind of receiving circuit for the measurement of S-band precipitation particles scattering experiment, including first order adjustable gain amplification branch road, second level adjustable gain amplification branch road, RF signal gain amplifying circuit, local oscillation signal gain amplifying circuit and mixing and filtering circuit, the first order adjustable gain amplification branch road is connected with second level adjustable gain amplification branch road, second level adjustable gain amplification branch road is connected with RF signal gain amplifying circuit, and RF signal gain amplifying circuit and local oscillation signal gain amplifying circuit are connected with mixing and filtering circuit；The utility model has the characteristics of adjustable gain section, and the Larger Dynamic scope measurement received can be achieved, ensure that the different distance of precipitation particle measurement.
Description
Technical field
Radar detection field is the utility model is related to, more particularly to a kind of S-band precipitation particles scattering experiment that is used for measures
Receiving circuit.
Background technology
S-band precipitation particles scattering experiment measurement receiving circuit is the important composition portion of precipitation particles scatterometry system
Point, its major function is in laboratory, and the small-signal that S-band radar antenna receives is preselected, amplify, become
Frequently, filtering, demodulation digitized processing, while suppress outside interference, clutter and set noise, make echo-signal as far as possible
Target information is kept without distortion, further to carry out signal transacting and data processing.S-band precipitation particles scattering experiment is surveyed
The core for measuring receiving circuit is mixer, and it is according to local oscillator (LO) frequency, and the signal of reception is turned from radio frequency
Change to intermediate frequency.The effective information of reception signal is obtained by the processing to intermediate frequency, detection and analysis, so as to derive surveyed precipitation
The scattered information of particle.When radar emission circuit transmission 3GHz microwave signals run into precipitation particles, the signal of scattering needs to lead to
Cross radar receiving circuit its echo-signal is received and handled, to obtain precipitation target information, so as to be finally inversed by precipitation
The microphysics parameter of particle.Because the signal that radar antenna receives is fainter, it would be desirable to it is amplified, after amplification
Signal be easy to the processing in later stage, and have certain requirement to the level of reception signal in data processing, and believe for receiving
Number the unfixed feature of size, receiving circuit of the prior art can not make different size of signal be satisfied by receive will
Ask, compatibility is relatively low.
Utility model content
Technical problem to be solved in the utility model is to provide one kind for above-mentioned the deficiencies in the prior art to be used for S-band
The receiving circuit of precipitation particles scattering experiment measurement, this receiving circuit for being used for the measurement of S-band precipitation particles scattering experiment have
The characteristics of adjustable gain section, the Larger Dynamic scope measurement received can be achieved, ensure that the different distance of precipitation particle measurement.
To realize above-mentioned technical purpose, the technical scheme that the utility model is taken is：
A kind of receiving circuit for the measurement of S-band precipitation particles scattering experiment, including first order adjustable gain amplification branch
Road, second level adjustable gain amplification branch road, RF signal gain amplifying circuit, local oscillation signal gain amplifying circuit and mixing and filtering
Circuit, the first order adjustable gain amplification branch road are connected with second level adjustable gain amplification branch road, the adjustable increasing in the second level
Benefit amplification branch road is connected with RF signal gain amplifying circuit, and the RF signal gain amplifying circuit and local oscillation signal gain are put
Big circuit is connected with mixing and filtering circuit；
The first order adjustable gain amplification branch road includes the first SP3T switch, the first low-noise amplifier, second
It is low-noise amplifier, the first attenuator, the first gain amplifier, the first bandpass filter, the 3rd low-noise amplifier, the 4th low
Noise amplifier, the second attenuator, the second bandpass filter and the second SP3T switch, first SP3T switch
Pin 1 is connected with reception antenna by SMA connectors, and the pin 2 of first SP3T switch passes sequentially through the first low noise
Acoustic amplifier, the second low-noise amplifier, the first attenuator, the first gain amplifier and the first bandpass filter and the second hilted broadsword
The pin 2 of three throw switches connects, the pin 3 of first SP3T switch and the pin 3 of second SP3T switch
Connection, the pins 4 of first SP3T switch also pass sequentially through the 3rd low-noise amplifier, the 4th low-noise amplifier,
Second attenuator and the second bandpass filter are connected with the pin 4 of the second SP3T switch；
The second level adjustable gain amplification branch road is put including the 3rd SP3T switch, the 3rd attenuator, the second gain
Big device, the 3rd bandpass filter, the 4th attenuator and the 4th SP3T switch, the pin 1 of the 3rd SP3T switch
Be connected with the pin 1 of the second SP3T switch, the pins 2 of the 3rd SP3T switch pass sequentially through the 3rd attenuator,
Second gain amplifier and the pin 2 of the SP3T switch of the 3rd bandpass filter the 4th are connected, and the 3rd SP3T is opened
The pin 3 of pass is connected with the pin 3 of the 4th SP3T switch, and the pin 4 of the 3rd SP3T switch declines by the 4th
The pin 4 for subtracting device with the 4th SP3T switch is connected, and the pin 1 of the 4th SP3T switch is put with RF signal gain
Big circuit connection.
As the further improved technical scheme of the utility model, the RF signal gain amplifying circuit declines including the 5th
Subtract device, the 3rd gain amplifier and the 4th bandpass filter, one end and the 4th SP3T switch of the 5th attenuator
Pin 1 is connected, and the other end of the 5th attenuator is connected with the 3rd gain amplifier, the 3rd gain amplifier and the 4th
Bandpass filter is connected, and the 4th bandpass filter is connected with mixing and filtering circuit.
As the further improved technical scheme of the utility model, it is double that the local oscillation signal gain amplifying circuit includes hilted broadsword
Throw switch, the 6th attenuator, the 4th gain amplifier and the 5th bandpass filter, the pin 2 of the single-pole double-throw switch (SPDT) and draw
Pin 3 is connected to SMA connectors, and the pin 1 of the single-pole double-throw switch (SPDT) is connected with the 6th attenuator, the 6th attenuator
It is connected with the 4th gain amplifier, the 4th gain amplifier is connected with the 5th bandpass filter, the 5th bandpass filtering
Device is connected with mixing and filtering circuit.
As the further improved technical scheme of the utility model, the mixing and filtering circuit includes frequency mixer and low pass filtered
Ripple device, the 5th bandpass filter and the 4th bandpass filter are connected with frequency mixer, the frequency mixer and low pass filter
Connection, the low pass filter are connected with SMA connectors.
As the further improved technical scheme of the utility model, first low-noise amplifier and the second low noise are put
The value of magnification of big device is 8dB, and the pad value of first attenuator is 3dB, and the value of magnification of first gain amplifier is
16dB, the value of magnification of the 3rd low-noise amplifier and the 4th low-noise amplifier is 8dB, and second attenuator declines
Depreciation is 3dB.
As the further improved technical scheme of the utility model, the pad value of the 3rd attenuator is 3dB, described
The value of magnification of two gain amplifiers is 16dB, and the pad value of the 4th attenuator is 8dB.
As the further improved technical scheme of the utility model, there is provided the sheet to the local oscillation signal gain amplifying circuit
The signal that shakes is 3.002GHz, and the pad value of the 6th attenuator is 3dB, and the value of magnification of the 4th gain amplifier is
16dB。
As the further improved technical scheme of the utility model, the radio frequency of the RF signal gain amplifying circuit reception
Reception signal is 3GHz, and the pad value of the 5th attenuator is 5 dB, and the value of magnification of the 3rd gain amplifier is 16dB.
The utility model compared with prior art, has the following advantages that：The utility model has the characteristics of adjustable gain section,
Branch road is amplified by first order adjustable gain and second level adjustable gain amplifies branch road and can realize that the Larger Dynamic scope of reception measures,
The different distance of precipitation particle measurement is ensure that, different size of signal can be allowed to meet the requirement received, there is certain compatibility
Property.The utility model is all to use passive device in terms of attenuator and wave filter, oneself design parameter, greatlys save cost.
Brief description of the drawings
Fig. 1 is circuit theory schematic diagram of the present utility model.
Fig. 2 is the circuit theory schematic diagram that first order adjustable gain of the present utility model amplifies branch road.
Fig. 3 is the circuit theory schematic diagram that second level adjustable gain of the present utility model amplifies branch road.
Fig. 4 is the circuit theory schematic diagram of local oscillation signal gain amplifying circuit of the present utility model.
Fig. 5 is the circuit theory schematic diagram of mixing and filtering circuit of the present utility model.
Embodiment
Specific embodiment of the present utility model is further illustrated below according to Fig. 1 to Fig. 5：
When radar emission circuit transmission 3GHz microwave signals run into precipitation particles, the signal of scattering needs to connect by radar
Receive circuit its echo-signal is received and handled, to obtain precipitation target information, so as to be finally inversed by the micro- of precipitation particles
See physical parameter.The utility model discloses a kind of receiving circuit for the measurement of S-band precipitation particles scattering experiment, including first
Level adjustable gain amplification branch road, second level adjustable gain amplification branch road, RF signal gain amplifying circuit, local oscillation signal gain are put
Big circuit and mixing and filtering circuit, the first order adjustable gain amplification branch road are connected with second level adjustable gain amplification branch road,
The second level adjustable gain amplification branch road is connected with RF signal gain amplifying circuit, the RF signal gain amplifying circuit
It is connected with local oscillation signal gain amplifying circuit with mixing and filtering circuit；Referring to Fig. 1 and Fig. 2, the first order adjustable gain is put
Big branch road include the first SP3T switch 3, the first low-noise amplifier 4, the second low-noise amplifier 5, the first attenuator 6,
First gain amplifier 7, the first bandpass filter 8, the 3rd low-noise amplifier 9, the decay of the 4th low-noise amplifier 10, second
Device 11, the second bandpass filter 12 and the second SP3T switch 13, the pin 1 of first SP3T switch 3 pass through SMA
Connector 2 is connected with reception antenna 1, the pins 2 of first SP3T switch 3 pass sequentially through the first low-noise amplifier 4,
Second low-noise amplifier 5, the first attenuator 6, the first gain amplifier 7 and the first bandpass filter 8 and the second SP3T
The pin 2 of switch 13 connects, the pin 3 of first SP3T switch 3 and the pin 3 of second SP3T switch 13
Connection, the pin 4 of first SP3T switch 3 also pass sequentially through the 3rd low-noise amplifier 9, the 4th low-noise amplifier
10th, the second attenuator 11 and the second bandpass filter 12 are connected with the pin 4 of the second SP3T switch 13；Referring to Fig. 1 or figure
3, the second level adjustable gain amplification branch road includes the 3rd SP3T switch 14, the 3rd attenuator 15, the second gain amplification
Device 16, the 3rd bandpass filter 17, the 4th attenuator 18 and the 4th SP3T switch 19, the 3rd SP3T switch 14
Pin 1 be connected with the pin 1 of the second SP3T switch 13, the pin 2 of the 3rd SP3T switch 14 passes sequentially through
The pin 2 of 3rd attenuator 15, the second gain amplifier 16 and the SP3T switch 19 of the 3rd bandpass filter 17 the 4th connects,
The pin 3 of 3rd SP3T switch 14 is connected with the pin 3 of the 4th SP3T switch 19, the 3rd SP3T
The pin 4 of switch 14 is connected by the 4th attenuator 18 with the pin 4 of the 4th SP3T switch 19, the 4th SP3T
The pin 1 of switch 19 is connected with RF signal gain amplifying circuit.
In the present embodiment, referring to Fig. 1, the RF signal gain amplifying circuit includes the 5th attenuator 20, the 3rd gain
The bandpass filter 22 of amplifier 21 and the 4th, one end of the 5th attenuator 20 and the pin 1 of the 4th SP3T switch 19
Connection, the other end of the 5th attenuator 20 is connected with the 3rd gain amplifier 21, the 3rd gain amplifier 21 and the
Four bandpass filters 22 are connected, and the 4th bandpass filter 22 is connected with mixing and filtering circuit.
In the present embodiment, referring to Fig. 1 or Fig. 4, the local oscillation signal gain amplifying circuit includes single-pole double-throw switch (SPDT) 23, the
Six attenuators 24, the 4th gain amplifier 25 and the 5th bandpass filter 26, the pin 2 and pin of the single-pole double-throw switch (SPDT) 23
3 are connected to SMA connectors 2, and the pin 1 of the single-pole double-throw switch (SPDT) 23 is connected with the 6th attenuator 24, and the described 6th declines
Subtract device 24 to be connected with the 4th gain amplifier 25, the 4th gain amplifier 25 is connected with the 5th bandpass filter 26, described
5th bandpass filter 26 is connected with mixing and filtering circuit.
In the present embodiment, referring to Fig. 1 or Fig. 5, the mixing and filtering circuit includes frequency mixer 27 and low pass filter 28, institute
State the 5th bandpass filter 26 and the 4th bandpass filter 22 is connected with frequency mixer 27, the frequency mixer 27 and low pass filter
28 connections, the low pass filter 28 are connected with SMA connectors 2.
In the present embodiment, the value of magnification of the low-noise amplifier 5 of the first low-noise amplifier 4 and second is 8dB, institute
The pad value for stating the first attenuator 6 is 3dB, and the value of magnification of first gain amplifier 7 is 16dB, and the 3rd low noise is put
The value of magnification of the big low-noise amplifier 10 of device 9 and the 4th is 8dB, and the pad value of second attenuator 11 is 3dB.
In the present embodiment, the pad value of the 3rd attenuator 15 is 3dB, the value of magnification of second gain amplifier 16
For 16dB, the pad value of the 4th attenuator 18 is 8dB.
In the present embodiment, local oscillation signal that the local oscillation signal gain amplifying circuit receives is 3.002GHz, the described 6th
The pad value of attenuator 24 is 3dB, and the value of magnification of the 4th gain amplifier 25 is 16dB.
In the present embodiment, radio frequency receiving signal that the RF signal gain amplifying circuit receives is 3GHz, the described 5th
The pad value of attenuator 20 is 5dB, and the value of magnification of the 3rd gain amplifier 21 is 16dB.
Operation principle of the present utility model is：Signal passes through FPGA's after plank is entered via the input of reception antenna 1
Control signal, gating carry out the passage of multistage amplification, may amplify the signal between -20dBm arrives -10dBm and enter frequency mixer 27 afterwards,
Local oscillation signal enters frequency mixer 27, the signal after output mixing after being amplified to 10dBm, then by low pass filter 28, obtains
Required intermediate-freuqncy signal.
Specifically, referring to Fig. 2, first order adjustable gain amplification branch road：Because there is provided the first SP3T switch 3 and
Two SP3T switch 13, therefore it is divided into three tunnels, the first via is by the first low-noise amplifier 4 and the second low-noise amplifier 5
Prime, amplify 8dB, then after the first attenuators of 3dB 6 and the first gain amplifiers of 16dB 7, by the first bandpass filter
8 can realize about 26dB gain；Second tunnel is straight-through；3rd tunnel is also by the 3rd low-noise amplifier 9 and the 4th low noise amplification
Device 10 is prime, amplifies 8dB, then after 3dB the second attenuators 11 and the second bandpass filter 12, can be achieved about 9dB's
Gain.
Specifically, referring to Fig. 3, second level adjustable gain amplification branch road：Because there is provided the He of the 3rd SP3T switch 14
4th SP3T switch 19, therefore it is divided into three tunnels, the first via can realize about 9dB gain；Second tunnel is straight-through；3rd tunnel is real
Existing 8dB decay.
Specifically, referring to Fig. 4, local oscillation signal gain amplifying circuit：Local oscillation signal 3.002GHz is 0dBm entering fashionable, first
After 3dB decay and 16dB amplifications, then by the 5th bandpass filter 26 after, then 10dBm enters frequency mixer 27.This local oscillator is defeated
Enter end plus a single-pole double-throw switch (SPDT) 23 for the ease of being debugged to the local oscillation signal of different frequency, also allow in the debugging stage
Directly local oscillation signal is given with signal source to be debugged.
Specifically, mixing and filtering circuit：3.002GHz local oscillation signals are mixed to obtain 2MHz's with 3GHz radio frequency receiving signals
Intermediate-freuqncy signal, then by LPF output circuit, Digital Signal Processing is carried out into next stage.
The path selection control of receiving power is corresponded to the following table is the receiving circuit of S-band precipitation particles scattering experiment measurement
Constitutional diagram.Because each SP3T switch are controlled with inputting 2 bit address code AB, 1A1B is represented first since input in figure
The control bit AB of SP3T switch 3, the like arrive 4A4B（That is the 4th SP3T switch 19）；If the signal received
For -55dBm, secondary series power bracket is selected（- 60, -50）Address code, then whole system -10dBm or so is amplified to signal
Into mixing, corresponding different input power, adjustable gain is realized；
The scope of protection of the utility model includes but is not limited to embodiment of above, and the scope of protection of the utility model is to weigh
Sharp claim is defined, and any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement are each fallen within
The scope of protection of the utility model.
Claims (8)
- A kind of 1. receiving circuit for the measurement of S-band precipitation particles scattering experiment, it is characterised in that：Including the adjustable increasing of the first order Benefit amplification branch road, the second level adjustable gain amplification branch road, RF signal gain amplifying circuit, local oscillation signal gain amplifying circuit and Mixing and filtering circuit, the first order adjustable gain amplification branch road are connected with second level adjustable gain amplification branch road, and described second Level adjustable gain amplification branch road is connected with RF signal gain amplifying circuit, the RF signal gain amplifying circuit and local oscillator letter Number gain amplifying circuit is connected with mixing and filtering circuit；The first order adjustable gain amplification branch road includes the first SP3T switch, the first low-noise amplifier, the second low noise Acoustic amplifier, the first attenuator, the first gain amplifier, the first bandpass filter, the 3rd low-noise amplifier, the 4th low noise Amplifier, the second attenuator, the second bandpass filter and the second SP3T switch, the pin of first SP3T switch 1 is connected with reception antenna by SMA connectors, and the pin 2 of first SP3T switch passes sequentially through the first low noise and put Big device, the second low-noise amplifier, the first attenuator, the first gain amplifier and the first bandpass filter and the second SP3T The pin 2 of switch is connected, and the pin 3 of first SP3T switch is connected with the pin 3 of second SP3T switch, The pin 4 of first SP3T switch also passes sequentially through the 3rd low-noise amplifier, the 4th low-noise amplifier, second declined Subtract device and the second bandpass filter to be connected with the pin 4 of the second SP3T switch；Second level adjustable gain amplification branch road include the 3rd SP3T switch, the 3rd attenuator, the second gain amplifier, 3rd bandpass filter, the 4th attenuator and the 4th SP3T switch, the pin 1 and second of the 3rd SP3T switch The pin 1 of SP3T switch connects, and the pin 2 of the 3rd SP3T switch passes sequentially through the 3rd attenuator, the second increasing The pin 2 of beneficial amplifier and the 3rd bandpass filter the 4th SP3T switch is connected, and the 3rd SP3T switch are drawn Pin 3 is connected with the pin 3 of the 4th SP3T switch, the pins 4 of the 3rd SP3T switch by the 4th attenuator with The pin 4 of 4th SP3T switch connects, pin 1 and the RF signal gain amplifying circuit of the 4th SP3T switch Connection.
- 2. the receiving circuit according to claim 1 for the measurement of S-band precipitation particles scattering experiment, it is characterised in that： The RF signal gain amplifying circuit includes the 5th attenuator, the 3rd gain amplifier and the 4th bandpass filter, and described One end of five attenuators is connected with the pin 1 of the 4th SP3T switch, the other end of the 5th attenuator and the 3rd gain Amplifier is connected, and the 3rd gain amplifier is connected with the 4th bandpass filter, and the 4th bandpass filter is filtered with mixing Wave circuit connects.
- 3. the receiving circuit according to claim 2 for the measurement of S-band precipitation particles scattering experiment, it is characterised in that： The local oscillation signal gain amplifying circuit includes single-pole double-throw switch (SPDT), the 6th attenuator, the 4th gain amplifier and the 5th band logical Wave filter, the pin 2 and pin 3 of the single-pole double-throw switch (SPDT) are connected to SMA connectors, and the single-pole double-throw switch (SPDT) draws Pin 1 is connected with the 6th attenuator, and the 6th attenuator is connected with the 4th gain amplifier, the 4th gain amplifier and Five bandpass filters are connected, and the 5th bandpass filter is connected with mixing and filtering circuit.
- 4. the receiving circuit according to claim 3 for the measurement of S-band precipitation particles scattering experiment, it is characterised in that： The mixing and filtering circuit includes frequency mixer and low pass filter, the 5th bandpass filter and the 4th bandpass filter with Frequency mixer is connected, and the frequency mixer is connected with low pass filter, and the low pass filter is connected with SMA connectors.
- 5. the receiving circuit according to claim 1 for the measurement of S-band precipitation particles scattering experiment, it is characterised in that： The value of magnification of first low-noise amplifier and the second low-noise amplifier is 8dB, the pad value of first attenuator For 3dB, the value of magnification of first gain amplifier is 16dB, the 3rd low-noise amplifier and the 4th low-noise amplifier Value of magnification be 8dB, the pad value of second attenuator is 3dB.
- 6. the receiving circuit according to claim 1 for the measurement of S-band precipitation particles scattering experiment, it is characterised in that： The pad value of 3rd attenuator is 3dB, and the value of magnification of second gain amplifier is 16dB, the 4th attenuator Pad value is 8dB.
- 7. the receiving circuit according to claim 3 for the measurement of S-band precipitation particles scattering experiment, it is characterised in that： The local oscillation signal for being supplied to the local oscillation signal gain amplifying circuit is 3.002GHz, and the pad value of the 6th attenuator is 3dB, the value of magnification of the 4th gain amplifier is 16dB.
- 8. the receiving circuit according to claim 2 for the measurement of S-band precipitation particles scattering experiment, it is characterised in that： The radio frequency receiving signal that the RF signal gain amplifying circuit receives is 3GHz, and the pad value of the 5th attenuator is 5 DB, the value of magnification of the 3rd gain amplifier is 16dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720918954.XU CN207218679U (en) | 2017-07-27 | 2017-07-27 | Receiving circuit for the measurement of S-band precipitation particles scattering experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720918954.XU CN207218679U (en) | 2017-07-27 | 2017-07-27 | Receiving circuit for the measurement of S-band precipitation particles scattering experiment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207218679U true CN207218679U (en) | 2018-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720918954.XU Expired - Fee Related CN207218679U (en) | 2017-07-27 | 2017-07-27 | Receiving circuit for the measurement of S-band precipitation particles scattering experiment |
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| Country | Link |
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| CN (1) | CN207218679U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370503A (en) * | 2017-07-27 | 2017-11-21 | 南京信息工程大学 | Receiving circuit for the measurement of S-band precipitation particles scattering experiment |
| CN109031310A (en) * | 2018-08-16 | 2018-12-18 | 南京信息工程大学 | S-band precipitation particles scatterometry instrument, measuring system and measurement method |
| CN109709522A (en) * | 2019-02-28 | 2019-05-03 | 南京信息工程大学 | A kind of two waveband precipitation particles scattering experiment measurement reception circuit |
-
2017
- 2017-07-27 CN CN201720918954.XU patent/CN207218679U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370503A (en) * | 2017-07-27 | 2017-11-21 | 南京信息工程大学 | Receiving circuit for the measurement of S-band precipitation particles scattering experiment |
| CN109031310A (en) * | 2018-08-16 | 2018-12-18 | 南京信息工程大学 | S-band precipitation particles scatterometry instrument, measuring system and measurement method |
| CN109709522A (en) * | 2019-02-28 | 2019-05-03 | 南京信息工程大学 | A kind of two waveband precipitation particles scattering experiment measurement reception circuit |
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Granted publication date: 20180410 Termination date: 20190727 |