CN220855169U - Gain control circuit of laser wind-finding radar - Google Patents
Gain control circuit of laser wind-finding radar Download PDFInfo
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- CN220855169U CN220855169U CN202322670386.4U CN202322670386U CN220855169U CN 220855169 U CN220855169 U CN 220855169U CN 202322670386 U CN202322670386 U CN 202322670386U CN 220855169 U CN220855169 U CN 220855169U
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Abstract
The utility model discloses a gain control circuit of a laser wind-finding radar, which comprises a signal input module, a signal amplifying module, an STC control module, a variable gain control module, an analog-to-digital conversion module and a signal output module, wherein the signal input module is connected with the STC control module through the signal amplifying module, the output end of the STC control module is connected with the variable gain control module, the output end of the variable gain control module is connected with the signal output module through the analog-to-digital conversion module, the STC control module comprises an echo curve circuit, an STC curve circuit and an STC output circuit, and the echo curve circuit and the STC curve circuit are respectively connected with the STC output circuit. According to the utility model, through the combination of the STC control module and the variable gain control module, on the premise of not complicating a control circuit, the echo gain control of the laser wind-finding radar is realized, and the dynamic receiving range of the radar is improved, so that the detection range of the radar is wider and farther.
Description
Technical Field
The utility model relates to the technical field of laser wind-finding radars, in particular to a gain control circuit of a laser wind-finding radar.
Background
The laser wind-finding radar is an atmospheric detecting instrument used in the fields of power and electric engineering and energy science and technology, and utilizes a Doppler heterodyne method to detect data such as wind speed, wind direction, temperature, wind shear, turbulence intensity and the like according to laser back scattering echoes of particles in air. The detection range of the laser wind-finding radar determines the detection precision of the data, and the larger the detection range is, the farther the obtained data precision is.
Suspended particles such as aerosol, dust and the like as detection targets have the characteristic of diffuse reflection, and the effective reflection area is equivalent to the effective light spot area. According to the radar distance equation, the detection distance R of the laser wind-finding radar has a great relationship with the transmitter power P t, the radar receiving power P r, the echo gain G, the wavelength λ, the radar detection area σ, and the like.
In order to increase the detection range of the radar, the increase of parameters such as the transmitter power P t, the echo gain G, the wavelength λ, the radar detection area σ and the like has a certain meaning, but the transmitter power Pt and the radar detection area σ are proportional to the fourth power of the radar detection distance R, that is, the transmitter power Pt is increased by a given coefficient or the radar detection area σ is increased, and the radar detection distance R is increased by only the fourth power of the coefficient, so that the increase of the detection distance caused by the increase of the transmitter power and the radar detection area is not obvious, and unnecessary energy consumption waste is caused, and the radar volume is increased. The wavelength lambda is a specific constant, so that a larger detection distance R (i.e. detection range) is obtained only by increasing the echo gain G, and the power consumption and the volume of the radar are not increased, and the effect is relatively obvious.
Disclosure of utility model
In order to achieve the above purpose, the utility model discloses a gain control circuit of a laser wind-finding radar, which comprises a signal input module, a signal amplification module, an STC control module, a variable gain control module, an analog-to-digital conversion module and a signal output module, wherein the signal input module is connected with the STC control module through the signal amplification module, the output end of the STC control module is connected with the variable gain control module, the output end of the variable gain control module is connected with the signal output module through the analog-to-digital conversion module, the STC control module comprises an echo curve circuit, an STC curve circuit and an STC output circuit, and the echo curve circuit and the STC curve circuit are respectively connected with the STC output circuit.
Further, the signal amplifying module comprises a first operational amplifier and a second operational amplifier, wherein the non-inverting input end of the first operational amplifier is connected with the signal input module, the inverting input end and the output end of the first operational amplifier are connected with the non-inverting input end of the second operational amplifier, and the inverting input end and the output end of the second operational amplifier are connected with the STC control module.
Further, the echo curve circuit comprises a third operational amplifier and a first variable resistor, wherein the non-inverting input end of the third operational amplifier is grounded through a filter component, the inverting input end of the third operational amplifier is connected with the output end of the second operational amplifier, and the two ends of the first variable resistor are respectively connected with the inverting input end and the output end of the third operational amplifier.
Further, the STC curve circuit includes a first digital-to-analog converter, a fourth operational amplifier and a second variable resistor, where the first digital-to-analog converter is connected to the non-inverting input end of the fourth operational amplifier, and two ends of the second variable resistor are respectively connected to the inverting input end and the output end of the fourth operational amplifier.
Further, the STC output circuit includes a fifth operational amplifier, where a non-inverting input terminal of the fifth operational amplifier is connected to an output terminal of the third operational amplifier, and an inverting input terminal and an output terminal of the fifth operational amplifier are connected to an output terminal of the fourth operational amplifier.
Further, the variable gain control module comprises a sixth operational amplifier, a digital potentiometer and a seventh operational amplifier, wherein the non-inverting input end of the sixth operational amplifier is connected with the output end of the STC control module, the inverting input end and the output end of the sixth operational amplifier are respectively connected with the digital potentiometer, the output end of the sixth operational amplifier is connected with the non-inverting input end of the seventh operational amplifier, and the inverting input end and the output end of the seventh operational amplifier are connected with the analog-to-digital conversion module.
The beneficial effects of the utility model are as follows:
According to the utility model, through the combination of the STC control module and the variable gain control module, on the premise of not complicating a control circuit, the echo gain control of the laser wind-finding radar is realized, and the dynamic receiving range of the radar is improved, so that the detection range of the radar is wider and farther.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system frame diagram of the present utility model;
FIG. 2 is a schematic circuit diagram of an STC control module according to the present utility model;
fig. 3 is a schematic circuit diagram of a variable gain control module according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In the description of the embodiments, the terms "disposed," "connected," and the like are to be construed broadly unless otherwise specifically indicated and defined. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; can be directly connected, can be connected through an intermediary medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the gain control circuit of the laser wind-finding radar of the embodiment comprises a signal input module, a signal amplifying module, an STC control module, a variable gain control module, an analog-to-digital conversion module and a signal output module, wherein the signal input module is connected with the STC control module through the signal amplifying module, the output end of the STC control module is connected with the variable gain control module, and the output end of the variable gain control module is connected with the signal output module through the analog-to-digital conversion module.
The signal input module can adopt an MCX connector, the analog-to-digital conversion module can adopt an ADC analog-to-digital converter, and the signal output module can adopt an SMA connector.
As shown in fig. 2, the STC control module includes an echo curve circuit (a part a in the figure), an STC curve circuit (B part B in the figure), and an STC output circuit (C part in the figure), and the echo curve circuit and the STC curve circuit are respectively connected to the STC output circuit.
The signal amplifying module comprises a first operational amplifier 1 and a second operational amplifier 2, wherein the non-inverting input end of the first operational amplifier 1 is connected with the signal input module, the inverting input end and the output end of the first operational amplifier 1 are connected with the non-inverting input end of the second operational amplifier 2, and the inverting input end and the output end of the second operational amplifier 2 are connected with the STC control module. After the radar echo signal input by the signal input module enters the circuit, the signal gain is improved, the noise is reduced and then the signal is output to the echo curve circuit through the two-stage amplification of the first operational amplifier 1 and the second operational amplifier 2.
The echo curve circuit comprises a third operational amplifier 3 and a first variable resistor 4, wherein the non-inverting input end of the third operational amplifier 3 is grounded through a filter component, the inverting input end of the third operational amplifier 3 is connected with the output end of the second operational amplifier 2, and the two ends of the first variable resistor 4 are respectively connected with the inverting input end and the output end of the third operational amplifier 3. By adjusting the resistance value of the first variable resistor 4, the adjustment of the attenuation amplitude of the echo signal can be realized, and the higher the resistance value is, the larger the attenuation amplitude of the echo signal is; conversely, the smaller. In this way, an echo curve can be formed, the X-axis of which is the radar detection distance and the Y-axis of which is the echo gain.
The STC curve circuit comprises a first digital-to-analog converter 5, a fourth operational amplifier 6 and a second variable resistor 7, wherein the first digital-to-analog converter 5 is connected with the non-inverting input end of the fourth operational amplifier 6, and two ends of the second variable resistor 7 are respectively connected with the inverting input end and the output end of the fourth operational amplifier 6.
The basic principle of STC (sensitivity time control) is that after each pulse is transmitted, a control voltage which approaches zero along with time is generated, the gain of a receiver channel is controlled in a radio frequency, an intermediate frequency or a feeder line at the front end of the receiver through a digital control attenuator, the magnitude of the control voltage changes along with time or a target distance, the gain is small at a short distance, and the gain is large at a long distance. By adjusting the resistance value of the second variable resistor 7, the attenuation amplitude of STC can be adjusted, and the higher the resistance value is, the larger the attenuation amplitude of STC is; conversely, the smaller. In this way, an STC curve can be formed, with the X-axis of the STC curve being the radar detection distance and Y being the STC attenuation value.
The STC output circuit includes a fifth operational amplifier 8, where a non-inverting input terminal of the fifth operational amplifier 8 is connected to an output terminal of the third operational amplifier, and an inverting input terminal and an output terminal of the fifth operational amplifier 8 are connected to an output terminal of the fourth operational amplifier 6. After the echo curve is subtracted from the STC curve (the magnitudes of the Y-axis curves are subtracted at the same time and at the same distance), an MQ signal is amplified and output by the fifth operational amplifier 8, so as to complete the STC gain control function.
The variable gain control module comprises a sixth operational amplifier 9, a digital potentiometer 10 and a seventh operational amplifier 11, wherein the non-inverting input end of the sixth operational amplifier 9 is connected with the output end of the STC control module, the inverting input end and the output end of the sixth operational amplifier 9 are respectively connected with the digital potentiometer 10, the output end of the sixth operational amplifier 9 is connected with the non-inverting input end of the seventh operational amplifier 11, and the inverting input end and the output end of the seventh operational amplifier 11 are connected with the analog-digital conversion module.
The MQ signal output by the STC output circuit is amplified by a sixth operational amplifier 9, and the resistance value is controlled by a digital potentiometer 10 (equivalent to the action of a variable resistor), so that the magnitude of the signal gain is controlled, and the larger the resistance value of the digital potentiometer 10 is, the smaller the signal gain is; conversely, the larger. The output signal is amplified by the seventh operational amplifier 11 and converted into a digital signal by the analog-to-digital conversion module to be output, so that the subsequent signal processing is facilitated, and the variable gain signal control function is completed.
By combining the STC control module and the variable gain control module, the utility model realizes STC and echo gain control of the laser wind-finding radar on the premise of not complicating a control circuit and adopting high-cost components, and improves the dynamic receiving range of the radar, thereby leading the detection range of the radar to be wider and farther, and effectively avoiding the situation that the signal is lost due to oversaturation of a receiver caused by overlarge signal intensity or the signal intensity is too weak to be captured.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model. In addition, the technical solutions between the embodiments may be combined with each other, but must be based on the implementation by those of ordinary skill in the art; when the combination of the technical solutions is contradictory or impossible to realize, it should be considered that the combination of the technical solutions does not exist and is not within the scope of protection claimed by the present utility model.
Claims (6)
1. The gain control circuit of the laser wind-finding radar is characterized in that: the system comprises a signal input module, a signal amplification module, an STC control module, a variable gain control module, an analog-to-digital conversion module and a signal output module, wherein the signal input module is connected with the STC control module through the signal amplification module, the output end of the STC control module is connected with the variable gain control module, the output end of the variable gain control module is connected with the signal output module through the analog-to-digital conversion module, the STC control module comprises an echo curve circuit, an STC curve circuit and an STC output circuit, and the echo curve circuit and the STC curve circuit are respectively connected with the STC output circuit.
2. The gain control circuit of a laser wind-finding radar according to claim 1, wherein: the signal amplifying module comprises a first operational amplifier and a second operational amplifier, wherein the non-inverting input end of the first operational amplifier is connected with the signal input module, the inverting input end and the output end of the first operational amplifier are connected with the non-inverting input end of the second operational amplifier, and the inverting input end and the output end of the second operational amplifier are connected with the STC control module.
3. The gain control circuit of a laser wind-finding radar according to claim 1, wherein: the echo curve circuit comprises a third operational amplifier and a first variable resistor, wherein the non-inverting input end of the third operational amplifier is grounded through a filter component, the inverting input end of the third operational amplifier is connected with the output end of the second operational amplifier, and the two ends of the first variable resistor are respectively connected with the inverting input end and the output end of the third operational amplifier.
4. A gain control circuit for a laser wind-finding radar as claimed in claim 3, wherein: the STC curve circuit comprises a first digital-to-analog converter, a fourth operational amplifier and a second variable resistor, wherein the first digital-to-analog converter is connected with the non-inverting input end of the fourth operational amplifier, and two ends of the second variable resistor are respectively connected with the inverting input end and the output end of the fourth operational amplifier.
5. The gain control circuit of laser wind-finding radar according to claim 4, wherein: the STC output circuit comprises a fifth operational amplifier, wherein the non-inverting input end of the fifth operational amplifier is connected with the output end of the third operational amplifier, and the inverting input end and the output end of the fifth operational amplifier are connected with the output end of the fourth operational amplifier.
6. The gain control circuit of a laser wind-finding radar according to claim 1, wherein: the variable gain control module comprises a sixth operational amplifier, a digital potentiometer and a seventh operational amplifier, wherein the non-inverting input end of the sixth operational amplifier is connected with the output end of the STC control module, the inverting input end and the output end of the sixth operational amplifier are respectively connected with the digital potentiometer, the output end of the sixth operational amplifier is connected with the non-inverting input end of the seventh operational amplifier, and the inverting input end and the output end of the seventh operational amplifier are connected with the analog-to-digital conversion module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322670386.4U CN220855169U (en) | 2023-10-07 | 2023-10-07 | Gain control circuit of laser wind-finding radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322670386.4U CN220855169U (en) | 2023-10-07 | 2023-10-07 | Gain control circuit of laser wind-finding radar |
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| Publication Number | Publication Date |
|---|---|
| CN220855169U true CN220855169U (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322670386.4U Active CN220855169U (en) | 2023-10-07 | 2023-10-07 | Gain control circuit of laser wind-finding radar |
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| Country | Link |
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| CN (1) | CN220855169U (en) |
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2023
- 2023-10-07 CN CN202322670386.4U patent/CN220855169U/en active Active
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