CN215575633U - Miniature meteorological radar calibration circuit - Google Patents
Miniature meteorological radar calibration circuit Download PDFInfo
- Publication number
- CN215575633U CN215575633U CN202123195976.3U CN202123195976U CN215575633U CN 215575633 U CN215575633 U CN 215575633U CN 202123195976 U CN202123195976 U CN 202123195976U CN 215575633 U CN215575633 U CN 215575633U
- Authority
- CN
- China
- Prior art keywords
- numerical control
- control attenuator
- power amplifier
- test signal
- intermediate power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
The utility model relates to a miniature meteorological radar calibration circuit, which relates to the technical field of meteorological radars and comprises an attenuation circuit, wherein the attenuation circuit comprises a power divider, a first test signal path and a second test signal path; the radio frequency signal is input into the power divider, and the output end of the power divider is respectively connected with the first test signal path and the second test signal path; the first test signal path comprises a first intermediate power amplifier and a first low-pass filter, the output end of the first intermediate power amplifier is connected with the input end of the first low-pass filter, and the first low-pass filter outputs a signal; the second test signal path comprises a multi-stage amplification attenuation circuit to realize large dynamic calibration of the test signal. The utility model can calibrate the receiving channel dynamically and gain well through the radio frequency excitation signal of the utility model, can well test the characteristics of the radio frequency excitation signal and the receiving channel, and can realize the autonomous operation monitoring of the miniaturized weather radar through remote control unattended operation and other modes in the later period.
Description
Technical Field
The utility model relates to the technical field of meteorological radars, in particular to a miniature meteorological radar calibration circuit.
Background
The meteorological radar calibration circuit is mainly used for radar online calibration, but the dynamic attenuation range of the current radar calibration circuit to a receiving channel is small, the control mode is relatively complex, and the complexity and the flexibility of the whole circuit are not enough.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art, provides a miniaturized meteorological radar calibration circuit and overcomes the defects of the conventional calibration circuit.
The purpose of the utility model is realized by the following technical scheme: a miniature weather radar calibration circuit comprises an attenuation circuit, wherein the attenuation circuit comprises a power divider, a first test signal circuit and a second test signal circuit; the radio frequency signal is input into a power divider, and the output end of the power divider is respectively connected with a first test signal path and a second test signal path; the first test signal path comprises a first intermediate power amplifier and a first low-pass filter, the output end of the first intermediate power amplifier is connected with the input end of the first low-pass filter, and the first low-pass filter outputs a signal; the second test signal path comprises a multi-stage amplification attenuation circuit to realize large dynamic calibration of the test signal.
The multistage amplification and attenuation circuit comprises a second intermediate power amplifier, a second low-pass filter, a first numerical control attenuator, a third intermediate power amplifier, a second numerical control attenuator, a third numerical control attenuator, a fourth intermediate power amplifier and a fourth numerical control attenuator in sequence; the output end of the second intermediate power amplifier is connected with the input end of the second low-pass filter, the output end of the second low-pass filter is connected with the input end of the first numerical control attenuator, the output end of the first numerical control attenuator is connected with the input end of the third intermediate power amplifier, the output end of the third intermediate power amplifier is connected with the input end of the second numerical control attenuator, the output end of the second numerical control attenuator is connected with the input end of the third numerical control attenuator, the output end of the third numerical control attenuator is connected with the input end of the fourth intermediate power amplifier, the output end of the fourth intermediate power amplifier is connected with the input end of the fourth numerical control attenuator, and the fourth numerical control attenuator outputs signals.
The control circuit is connected with the first numerical control attenuator, the second numerical control attenuator, the third numerical control attenuator and the fourth numerical control attenuator and controls the attenuators of different attenuators to realize dynamic control of link attenuation.
The control circuit comprises an MCU chip U1 and a power supply chip U2; the MCU chip U1 is connected with the first numerical control attenuator, the second numerical control attenuator, the third numerical control attenuator and the fourth numerical control attenuator through different I/O ports, and the attenuators of different attenuators are controlled to realize dynamic control of link attenuation; the power chip U2 with MCU chip U1 connects, provides the power for MCU chip U1, MCU chip U1 communicates with the host computer through PA11 and PA12 port.
The first intermediate power amplifier, the second intermediate power amplifier, the third intermediate power amplifier and the fourth intermediate power amplifier are all low-gain high-output amplifiers with 1dB compression points, and signal amplification and link linearity isolation are achieved.
The utility model has the following advantages: a miniature meteorological radar calibration circuit can perform dynamic and gain calibration on a receiving channel through a radio frequency excitation signal of the miniature meteorological radar, can well check the characteristics of the radio frequency excitation signal and the receiving channel, can master and understand the running state of the whole machine in real time, and can monitor the autonomous running of the miniature meteorological radar in the later period through modes such as remote control unattended operation and the like; and the dynamic attenuation range of the calibration circuit is expanded, and the whole control mode is simple and convenient.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit diagram of the attenuator circuit A;
FIG. 3 is a circuit diagram of the attenuator circuit B;
fig. 4 is a circuit diagram of the control circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the present application provided below in connection with the appended drawings is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application. The utility model is further described below with reference to the accompanying drawings.
As shown in figure 1, the utility model relates to a calibration circuit in an X-band 200W miniaturized meteorological radar system, which comprises an attenuation circuit and a control circuit, supports the online calibration function of the radar, and divides the power of an internal radio frequency test signal into two paths to be output through a calibration module, wherein one path is coupled into a receiving channel after being attenuated by 100dB, and the other path is amplified to output for power monitoring. The circuit can realize serial attenuation control of radio frequency test signals with an upper computer, realize calibration test of indexes such as dynamic range, channel gain and the like of a receiving channel, and guarantee the detection accuracy of a radar system and the requirements of automatic correction of the system.
Furthermore, the attenuation circuit comprises a power divider, a first test signal path and a second test signal path; the radio frequency signal is input into a power divider, and the output end of the power divider is respectively connected with a first test signal path and a second test signal path; the first test signal path comprises a first intermediate power amplifier and a first low-pass filter, the output end of the first intermediate power amplifier is connected with the input end of the first low-pass filter, and the first low-pass filter outputs a signal; the second test signal path comprises a multi-stage amplification attenuation circuit to realize large dynamic calibration of the test signal.
The multistage amplification and attenuation circuit comprises a second intermediate power amplifier, a second low-pass filter, a first numerical control attenuator, a third intermediate power amplifier, a second numerical control attenuator, a third numerical control attenuator, a fourth intermediate power amplifier and a fourth numerical control attenuator in sequence; the output end of the second intermediate power amplifier is connected with the input end of the second low-pass filter, the output end of the second low-pass filter is connected with the input end of the first numerical control attenuator, the output end of the first numerical control attenuator is connected with the input end of the third intermediate power amplifier, the output end of the third intermediate power amplifier is connected with the input end of the second numerical control attenuator, the output end of the second numerical control attenuator is connected with the input end of the third numerical control attenuator, the output end of the third numerical control attenuator is connected with the input end of the fourth intermediate power amplifier, the output end of the fourth intermediate power amplifier is connected with the input end of the fourth numerical control attenuator, and the fourth numerical control attenuator outputs signals.
Specifically, as shown in fig. 2, which is a circuit diagram of an attenuation circuit a, that is, a first part of an overall circuit, and fig. 3 is a circuit diagram of an attenuation circuit B, that is, a second part of the overall circuit, the attenuation circuit a and the attenuation circuit B are combined into an X-band 200W miniaturized weather radar calibration attenuation circuit, a calibration signal is input through a power divider N1 and divided into two paths of signals, which respectively enter two stages of amplification circuits N2 and N4, and a signal passing through an amplifier N2 enters a chassis panel after passing through a filter N3 and is output as a test signal for verification test; the signal passing through the amplifier N4 enters a first-stage six-digit controlled attenuator N6 after being filtered by a filter N5, so that power control is realized; then the attenuated signal enters an amplifier N7 to be amplified and then enters a second-stage six-stage digital controlled attenuator N8 and a third-stage six-stage digital controlled attenuator N9, and the total attenuation of the two-stage digital controlled attenuation is 63 dB; the attenuated signal passes through an amplifier N10 and then enters a final-stage six-digit controlled attenuator N11 for attenuation output. The amplifiers N2, N4, N7 and N10 are low gain high output 1dB compression point amplifiers, and provide better isolation while ensuring link linearity.
As shown in fig. 4, the attenuation of the different attenuators is controlled through different ports of the MCU chip U1, so as to realize dynamic control of the link; u2 provides power for U1. Meanwhile, the PA11 and the PA12 of the U1 can communicate with an upper computer, so that simple, convenient and quick control is realized.
The working principle of the utility model is as follows: the radio frequency test signal outputs two paths of test signals through the power divider, and one path of test signal realizes the monitoring of the test signal through amplifying and outputting; one path of test signal passes through a 100dB numerical control attenuation circuit to realize the function of large dynamic calibration on the test signal; the two amplifiers have the functions of improving the isolation of power division output and amplifying radio frequency test signals to meet the requirement of rear-end test; the method is mainly used for online calibration of the X-band miniaturized meteorological radar, and mainly realizes related tests on the dynamic range of a receiving channel and the like by carrying out large dynamic attenuation on radio frequency transmission radio frequency signals.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the utility model is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. A miniaturized weather radar calibration circuit is characterized in that: the circuit comprises an attenuation circuit, wherein the attenuation circuit comprises a power divider, a first test signal path and a second test signal path; the radio frequency signal is input into a power divider, and the output end of the power divider is respectively connected with a first test signal path and a second test signal path; the first test signal path comprises a first intermediate power amplifier and a first low-pass filter, the output end of the first intermediate power amplifier is connected with the input end of the first low-pass filter, and the first low-pass filter outputs a signal; the second test signal path comprises a multi-stage amplification attenuation circuit to realize large dynamic calibration of the test signal.
2. The miniaturized weather radar calibration circuit of claim 1, wherein: the multistage amplification and attenuation circuit comprises a second intermediate power amplifier, a second low-pass filter, a first numerical control attenuator, a third intermediate power amplifier, a second numerical control attenuator, a third numerical control attenuator, a fourth intermediate power amplifier and a fourth numerical control attenuator in sequence; the output end of the second intermediate power amplifier is connected with the input end of the second low-pass filter, the output end of the second low-pass filter is connected with the input end of the first numerical control attenuator, the output end of the first numerical control attenuator is connected with the input end of the third intermediate power amplifier, the output end of the third intermediate power amplifier is connected with the input end of the second numerical control attenuator, the output end of the second numerical control attenuator is connected with the input end of the third numerical control attenuator, the output end of the third numerical control attenuator is connected with the input end of the fourth intermediate power amplifier, the output end of the fourth intermediate power amplifier is connected with the input end of the fourth numerical control attenuator, and the fourth numerical control attenuator outputs signals.
3. The miniaturized weather radar calibration circuit of claim 2, wherein: the control circuit is connected with the first numerical control attenuator, the second numerical control attenuator, the third numerical control attenuator and the fourth numerical control attenuator and controls the attenuators of different attenuators to realize dynamic control of link attenuation.
4. A miniaturized weather radar calibration circuit as defined in claim 3, further comprising: the control circuit comprises an MCU chip U1 and a power supply chip U2; the MCU chip U1 is connected with the first numerical control attenuator, the second numerical control attenuator, the third numerical control attenuator and the fourth numerical control attenuator through different I/O ports, and the attenuators of different attenuators are controlled to realize dynamic control of link attenuation; the power chip U2 with MCU chip U1 connects, provides the power for MCU chip U1, MCU chip U1 communicates with the host computer through PA11 and PA12 port.
5. The miniaturized weather radar calibration circuit of claim 2, wherein: the first intermediate power amplifier, the second intermediate power amplifier, the third intermediate power amplifier and the fourth intermediate power amplifier are all low-gain high-output amplifiers with 1dB compression points, and signal amplification and link linearity isolation are achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123195976.3U CN215575633U (en) | 2021-12-20 | 2021-12-20 | Miniature meteorological radar calibration circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123195976.3U CN215575633U (en) | 2021-12-20 | 2021-12-20 | Miniature meteorological radar calibration circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215575633U true CN215575633U (en) | 2022-01-18 |
Family
ID=79853779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123195976.3U Active CN215575633U (en) | 2021-12-20 | 2021-12-20 | Miniature meteorological radar calibration circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215575633U (en) |
-
2021
- 2021-12-20 CN CN202123195976.3U patent/CN215575633U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102435835B (en) | Rms and envelope detector | |
| CN101924527B (en) | Broadband programmable gain amplifier with precise gain step size | |
| CN100588112C (en) | Device and method for realizing wide band micro power linear power amplication | |
| CN104168001A (en) | Eight-channel gain-controllable down converter | |
| CN210246728U (en) | Automatic gain module for receiving frequency converter | |
| CN112564726B (en) | Receiver broadband large dynamic automatic gain control circuit | |
| CN114244297A (en) | Multi-gain control low noise amplifier with improved gain attenuation scheme | |
| CN215575633U (en) | Miniature meteorological radar calibration circuit | |
| CN114268285A (en) | Automatic gain control device with large-range power variation | |
| CN110927677B (en) | Broadband low-power-consumption four-in-one receiver | |
| CN210469240U (en) | High-stability forward automatic gain control circuit | |
| CN100478707C (en) | Preamplification and filtering circuit for precision isolated amplifier | |
| CN109525210A (en) | Power amplifying system, method and application | |
| CN216565121U (en) | S-band and X-band receiving channel gain self-adaptive adjusting system | |
| CN109462416B (en) | Intermediate frequency receiver based on single-channel target information extraction | |
| CN114172478A (en) | Low-noise amplifier wide-range high-precision gain control circuit | |
| CN220231863U (en) | Power detection circuit | |
| CN201846311U (en) | Power amplifier | |
| CN208079024U (en) | The broadband programme-controlled gain operational amplifier circuit of one kind+5V single supplies power supply | |
| CN202978838U (en) | Automatic gain controller used for short wave receiver | |
| CN215646733U (en) | Weather radar large dynamic receiving front-end circuit | |
| CN219980820U (en) | Multichannel radio frequency front end based on LRM framework | |
| CN216929983U (en) | Automatic gain control device with wide power variation range | |
| CN117895910B (en) | Low-noise multimode transmitter power amplifier module | |
| CN213585706U (en) | Radio frequency low noise amplifier circuit based on CKRF3509MM34 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |