CN115560826B - System for improving stability of radar data and radar fluviograph - Google Patents
System for improving stability of radar data and radar fluviograph Download PDFInfo
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- CN115560826B CN115560826B CN202211187131.6A CN202211187131A CN115560826B CN 115560826 B CN115560826 B CN 115560826B CN 202211187131 A CN202211187131 A CN 202211187131A CN 115560826 B CN115560826 B CN 115560826B
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- 238000012545 processing Methods 0.000 claims abstract description 94
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 185
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 53
- 230000003321 amplification Effects 0.000 claims description 52
- 238000004891 communication Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 230000017525 heat dissipation Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 14
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 240000007320 Pinus strobus Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 238000002592 echocardiography Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- 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
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Abstract
The invention discloses a system for improving radar data stability and a radar water level gauge, relates to the technical field of high-frequency microwave ranging, and solves the technical problem of low stability of the existing radar data acquisition. The system comprises a radar unit, an MCU unit connected with the radar unit and a digital-to-analog conversion module connected with the MCU unit. The radar unit comprises a radar device, an I-path data processing unit and a Q-path data processing unit, wherein the I-path data processing unit and the Q-path data processing unit are connected with the radar device; the I-path data processing unit and the Q-path data processing unit are respectively connected with the MCU unit and the digital-to-analog conversion module. The system can effectively improve the stability of radar data transmission.
Description
Technical Field
The invention relates to the technical field of high-frequency microwave ranging, in particular to a system for improving radar data stability and a radar fluviograph.
Background
The radar water level gauge is a water level gauge adopting a high-frequency microwave ranging technology, and the sensor is used for transmitting electromagnetic waves to irradiate the water surface and receiving echoes, so that the information of the distance, the azimuth and the like from the water surface to an electromagnetic wave transmitting point is obtained through analysis. The water level can be continuously and automatically detected for a long time, and the water level detection device is suitable for water conservancy projects such as rivers, lakes, reservoirs, hydropower stations, irrigation channels and the like, and water level monitoring in municipal projects such as tap water, municipal sewage detection, municipal road ponding and the like.
The radar water level gauge on the market currently has radar water level measuring schemes based on 24GHz, 60GHz, 77GHz and 120 Ghz.
In the process of implementing the present invention, the inventor finds that at least the following problems exist in the prior art:
1) For partial radar schemes, the stability of data acquisition is not very high, and defects such as hop count and the like are easy to occur during long-time measurement;
2) For most of 24GHz, 60GHz, 77GHz and 120Ghz radar schemes, customers are generally required to design antennas, the difficulty and cost of antenna design are high, and the requirements are generally very difficult to reach.
Disclosure of Invention
The invention aims to provide a system for improving the stability of radar data and a radar water gauge so as to solve the technical problems in the prior art. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the system for improving the stability of radar data comprises a radar unit, an MCU unit connected with the radar unit and a digital-to-analog conversion module connected with the MCU unit; the radar unit comprises a radar device, an I-path data processing unit and a Q-path data processing unit which are connected with the radar device; the I-path data processing unit and the Q-path data processing unit are respectively connected with the MCU unit and the digital-to-analog conversion module; the I-path data processing unit acquires echo data of the radar device; the Q-path data processing unit acquires reference data corresponding to echo data; when the data of the I-path data processing unit is consistent with or close to the data of the Q-path data processing unit, the MCU unit acquires the data from the I-path data processing unit and the Q-path data processing unit through the digital-to-analog conversion module, calculates the detection distance of the radar device according to the acquired data, and outputs a control signal according to the calculated detection distance to control the I-path data processing unit and the Q-path data processing unit to perform reverse frequency selection amplification on I, Q two paths of data;
The I-path data processing unit and the Q-path data processing unit comprise a low-noise differential amplification module, a narrow-band amplification module, an adjusting frequency-selecting amplification module and a low-pass filtering module which are connected in sequence; the low-noise differential amplification module of the I-path data processing unit is connected with an I channel of the radar device receiving end, and the low-noise differential amplification module of the Q-path data processing unit is connected with a Q channel of the radar device receiving end; the adjusting frequency-selecting amplifying module of the I-path data processing unit and the adjusting frequency-selecting amplifying module of the Q-path data processing unit are connected with the MCU unit; the low-pass filter module of the I-path data processing unit and the low-pass filter module of the Q-path data processing unit are connected with the digital-to-analog conversion module; each low-noise differential amplification module comprises a frequency-selecting amplification circuit and a reference voltage circuit connected with the frequency-selecting amplification circuit; the frequency-selecting amplifying circuit of the I-path data processing unit is connected with an I-path of the radar device receiving end and is used for frequency-selecting and amplifying the I-path echo data; the frequency-selecting amplifying circuit of the Q-path data processing unit is connected with a Q-path of the radar device receiving end and is used for frequency-selecting and amplifying Q-path reference data; the reference voltage circuit is used for superposing a reference voltage on the frequency-selecting amplifying circuit.
Preferably, the frequency-selecting amplifying circuit includes a first operational amplifier U1, a first capacitor C1 and a first resistor R1 connected in series, a second capacitor C2 and a second resistor R2 connected in series, a third capacitor C3 and a third resistor R3 connected in parallel, and a fifth capacitor C5 and a fifth resistor R5 connected in parallel; a polar plate of a second capacitor C2 of the frequency-selecting amplifying circuit of the I-path data processing unit is connected with an I-path of the radar device receiving end; a polar plate of a first capacitor C1 of the frequency-selecting amplifying circuit of the Q-channel data processing unit is connected with a Q channel of the radar device receiving end; one end of the first resistor R1 and one end of the second resistor R2 are respectively connected with a No. 3 pin and a No. 4 pin of the first operational amplifier U1; a parallel node of the third capacitor C3 and the third resistor R3 which are connected in parallel is connected between the second resistor R2 and the No. 4 pin of the first operational amplifier U1, and the other parallel node of the third capacitor C3 and the third resistor R3 which are connected in parallel is connected with the No. 1 pin of the first operational amplifier U1; a parallel node of the fifth capacitor C5 and the fifth resistor R5 connected in parallel is connected between the first resistor R1 and pin 3 of the first op-amp U1.
Preferably, the reference voltage circuit includes a fourth capacitor C4 and a fourth resistor R4 connected in parallel, a seventh capacitor C7 and an eighth capacitor C8 connected in parallel, and a sixth resistor R6; one parallel node of the fourth capacitor C4 and the fourth resistor R4 which are connected in parallel is connected with one end of the sixth resistor R6, and the other parallel node of the fourth capacitor C4 and the fourth resistor R4 which are connected in parallel is grounded; a parallel node of the seventh capacitor C7 and the eighth capacitor C8 which are connected in parallel is connected with the other end of the sixth resistor R6, and the other parallel node of the seventh capacitor C7 and the eighth capacitor C8 which are connected in parallel is connected with the No. 2 pin of the first operational amplifier U1 and is grounded; a voltage VCC is connected to the connection point of the sixth resistor R6, the seventh capacitor C7, the eighth capacitor C8 and the No. 5 pin of the first operational amplifier U1; the other parallel node of the fifth capacitor C5 and the fifth resistor R5 is connected between the fourth resistor R4 and the sixth resistor R6.
Preferably, each narrow-band amplifying module includes a second operational amplifier U2, a seventh resistor R7 and a ninth capacitor C9 connected in parallel, an eighth resistor R8, a ninth resistor R9, a tenth capacitor C10 and an eleventh capacitor C11 connected in parallel, a twelfth capacitor C12 and a twelfth resistor R12 connected in series, and a thirteenth resistor R13 and a thirteenth capacitor C13 connected in parallel; a parallel node of the seventh resistor R7 and the ninth capacitor C9 which are connected in parallel is connected with one end of the eighth resistor R8 and one end of the ninth resistor R9, and the other parallel node of the seventh resistor R7 and the ninth capacitor C9 which are connected in parallel is grounded; a parallel node of the tenth capacitor C10 and the eleventh capacitor C11 which are connected in parallel is connected with the other end of the eighth resistor R8 and the No. 5 pin of the second operational amplifier U2, and the other parallel node of the tenth capacitor C10 and the eleventh capacitor C11 which are connected in parallel is connected with the No. 2 pin of the second operational amplifier U2 and is grounded; the other end of the ninth resistor R9 is connected with a pin 3 of the second operational amplifier U2, a pin 4 of the second operational amplifier U2 is connected with one end of a twelfth resistor R12, a parallel joint point of a thirteenth resistor R13 and a thirteenth capacitor C13 which are connected in parallel is connected with the other parallel joint point of the thirteenth resistor R13 and the thirteenth capacitor C13 which are connected in parallel; one polar plate of the twelfth capacitor C12 is connected with the No. 1 pin of the first operational amplifier U1; the voltage VCC is connected to the connection of the eighth resistor R8, the tenth capacitor C10, the eleventh capacitor C11 and pin 5 of the second operational amplifier U2.
Preferably, each of the adjusting frequency-selecting amplifying modules comprises an amplifying circuit, a serial frequency-selecting circuit and a parallel frequency-selecting circuit; and the series frequency selection circuit and the amplifying circuit are both connected with the parallel frequency selection circuit.
Preferably, the amplifying circuit includes a third operational amplifier U3, a thirteenth capacitor C14, a fifteenth resistor R15, a sixteenth resistor R16, a fifteenth capacitor C15 and a sixteenth capacitor C16 connected in parallel; a parallel node of the fourteenth resistor R14 and the thirteenth capacitor C14 which are connected in parallel is connected with one end of the fifteenth resistor R15 and one end of the sixteenth resistor R16, and the other parallel node of the fourteenth resistor R14 and the thirteenth capacitor C14 which are connected in parallel is grounded; a parallel node of the fifteenth capacitor C15 and the sixteenth capacitor C16 which are connected in parallel is connected with the other end of the fifteenth resistor R15 and the No. 5 pin of the third operational amplifier U3, and the other parallel node of the fifteenth capacitor C15 and the sixteenth capacitor C16 which are connected in parallel is grounded; the other end of the sixteenth resistor R16 is connected with a pin No. 3 of the third operational amplifier U3, and a pin No. 2 of the third operational amplifier U3 is grounded; the voltage VCC is connected to the connection of the fifteenth resistor R15, the fifteenth capacitor C15, the sixteenth capacitor C16 and pin 5 of the third operational amplifier U3.
Preferably, the series frequency selection circuit comprises a first analog switch U4, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19 and a seventeenth capacitor C17; one end of a seventeenth resistor R17, one end of an eighteenth resistor R18 and one end of a nineteenth resistor R19 are respectively connected with a No. 2 pin, a No. 3 pin and a No. 4 pin of the first analog switch U4, the other end of the seventeenth resistor R17, the other end of the eighteenth resistor R18 and the other end of the nineteenth resistor R19 are connected with one polar plate of a seventeenth capacitor C17, and the other polar plate of the seventeenth capacitor C17 is connected with the No. 1 pin of the second operational amplifier U2; the parallel frequency selection circuit comprises a second analog switch U5, a twenty-first resistor R20, a twenty-second resistor R21, a twenty-second resistor R22 and an eighteenth capacitor C18; one end of a twenty-first resistor R20, one end of a twenty-first resistor R21 and one end of a twenty-second resistor R22 are respectively connected with a No. 2 pin, a No. 3 pin and a No. 4 pin of the second analog switch U5; one polar plate of the eighteenth capacitor C18 is connected with the pin No. 4 of the third operational amplifier U3, the pin No. 1 of the first analog switch U4, the other end of the twentieth resistor R20, the other end of the twenty-first resistor R21 and the other end of the twenty-second resistor R22, and the other polar plate of the eighteenth capacitor C18 is connected with the pin No. 1 of the third operational amplifier U3 and the pin No. 1 of the second analog switch U5; the pin 5 and the pin 6 of the first analog switch U4 are respectively connected with a first control signal P1 and a second control signal P2, the pin 5 and the pin 6 of the second analog switch U5 are respectively connected with a third control signal P3 and a fourth control signal P4, and the first control signal P1, the second control signal P2, the third control signal P3 and the fourth control signal P4 are generated by the MCU unit; and an output end is arranged at the joint of the No. 1 pin of the third operational amplifier U3 and the No. 1 pin of the second analog switch U5, and the output end is connected with the digital-to-analog conversion module.
The invention provides a radar water level gauge, which comprises the system for improving the stability of radar data, an upper cover, a lower cover and an external interface; the system for improving the stability of the radar data further comprises a communication unit connected with the MCU unit, a heat dissipation structure arranged on the radar unit and a power management unit connected with the MCU unit and the radar unit.
Preferably, the radar unit, the MCU unit, the digital-to-analog conversion module, the communication unit, the heat dissipation structure and the power management unit are integrated on a PCB, the PCB is arranged between the upper cover and the lower cover, and the MCU unit is communicated with the external interface.
Preferably, the radar apparatus integrates a receiving antenna and a transmitting antenna.
By implementing one of the technical schemes, the invention has the following advantages or beneficial effects:
according to the system for improving the radar data stability, disclosed by the invention, the radar receiving signals are subjected to automatic adjustable intermediate frequency filtering amplification, and the system can be suitable for radar data stability measurement under different distances.
The radar water level gauge has the beneficial effects that:
(1) The transmitting antenna and the receiving antenna are all integrated on the chip, so that the design of a developer is facilitated, and the design cost and time are correspondingly reduced; the 120GHz radar has higher measurement precision and small measurement blind area;
(2) The multiple lens antennas have smaller emission angles, more concentrated energy, stronger echo signals and higher stability compared with other radar schemes under the same working condition;
(3) The excellent radar signal processing method carries out automatic adjustable intermediate frequency filtering amplification on the radar receiving signal, and can adapt to radar data stability measurement under different distances;
(4) And the reliable operation of the radar unit and the low-power-consumption operation of the whole equipment are ensured by scientific and reasonable power supply control.
Drawings
For a clearer description of the technical solutions of embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, in which:
FIG. 1 is a schematic diagram of a system for improving the stability of radar data according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a low noise differential amplification module according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a narrowband amplification module in accordance with an embodiment of the invention;
FIG. 4 is a circuit diagram of a tuning frequency selective amplification module according to an embodiment of the present invention;
FIG. 5 is a plan perspective view of a radar level gauge according to an embodiment of the present invention;
fig. 6 is a structural diagram of a radar PCB board according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power management module according to an embodiment of the present invention.
In the figure: 1. a radar unit; 11. a radar device; 12. an I-path data processing unit; 13. a Q-way data processing unit; 121. a frequency-selecting amplifying circuit; 122. a reference voltage circuit; 123. an amplifying circuit; 124. a series frequency selection circuit; 125. a parallel frequency selection circuit; 2. an MCU unit; 3. a digital-to-analog conversion module; 4. an upper cover; 5. a lower cover; 6. an external interface; 7. a communication unit; 8. a heat dissipation structure; 9. and a power management unit.
Detailed Description
For a better understanding of the objects, technical solutions and advantages of the present invention, reference should be made to the various exemplary embodiments described hereinafter with reference to the accompanying drawings, which form a part hereof, and in which are described various exemplary embodiments which may be employed in practicing the present invention. The same reference numbers in different drawings identify the same or similar elements unless expressly stated otherwise. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. It is to be understood that they are merely examples of processes, methods, apparatuses, etc. that are consistent with certain aspects of the present disclosure as detailed in the appended claims, other embodiments may be utilized, or structural and functional modifications may be made to the embodiments set forth herein without departing from the scope and spirit of the present disclosure.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," and the like are used in an orientation or positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and to simplify the description, rather than to indicate or imply that the elements referred to must have a particular orientation, be constructed and operate in a particular orientation. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "connected," "coupled" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, communicatively connected, directly connected, indirectly connected via intermediaries, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The term "and/or" includes any and all combinations of one or more of the associated listed items. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In order to illustrate the technical solutions of the present invention, the following description is made by specific embodiments, only the portions related to the embodiments of the present invention are shown.
Embodiment one:
as shown in fig. 1, the invention provides a system for improving the stability of radar data, which comprises a radar unit 1, an MCU unit 2 connected with the radar unit 1, and a digital-to-analog conversion module 3 connected with the MCU unit 2. Specifically, the radar unit 1 includes a radar device 11, an I-path data processing unit 12 and a Q-path data processing unit 13, which are all connected to the radar device 11, and the I-path data processing unit 12 and the Q-path data processing unit 13 are both connected to the MCU unit 2 and the digital-to-analog conversion module 3, respectively. Further, the I-path data processing unit 12 acquires echo data (such as echo frequency, echo signal energy, echo signal amplitude, etc.) of the radar device 11; the Q-way data processing unit 13 collects reference data corresponding to echo data; when the data of the I-path data processing unit 12 is consistent with or close to the data of the Q-path data processing unit 13, the MCU unit 2 obtains the data from the I-path data processing unit 12 and the Q-path data processing unit 13 through the digital-to-analog conversion module 3, calculates the detection distance of the radar device 11 according to the obtained data, and outputs a control signal according to the calculated detection distance to control the I-path data processing unit 12 and the Q-path data processing unit 13 to perform reverse frequency selection amplification on the I, Q two paths of data.
It is known that the further the radar data is along with the measured object, the weaker the corresponding signal energy is, the lower the measured signal amplitude data is, and if no correlation processing is performed, the stability of the radar measured data is reduced, so that the measured distance is not accurate enough. Therefore, the system for improving the stability of radar data provided by the invention can automatically and adjustably filter and amplify the radar receiving signals at intermediate frequency, and can be suitable for measuring the stability of radar data under different distances. Specifically, the radar device 11 of the present invention is provided with a transmitting end and a receiving end, the signal transmitted by the transmitting end returns after contacting an object, the signal received by the receiving end is quadrature demodulated and respectively outputs demodulated data through I, Q two paths of channels, and I, Q two paths of output data are subjected to data processing through the I path data processing unit 12 and the Q path data processing unit 13. I. The Q two echo signals are two orthogonal signals, and the phase difference is 90 degrees. The I-path data processing unit 12 is used as a main data acquisition channel, the Q-path data processing unit 13 is used as a reference data acquisition channel, and the data is considered as effective data to be output only when the acquired data of the two paths I, Q are the same or the data of the Q paths are close to the data of the I-path. Therefore, the system of the invention can effectively improve the stability of radar data transmission.
It should be noted that, the reference data and the reference data acquisition channels of the Q channel and the I channel may be software defined. Of course, defining the Q channel as the reference data, and considering that the measurement distance is valid when the data of the I-path data processing unit is consistent with or close to the data of the Q-path data processing unit (for example, the ratio of the absolute value of the data of the Q-path data processing unit subtracted by the data of the I-path data processing unit divided by the data of the Q-path data processing unit is smaller than a preset value); if the I channel is defined as the reference data, the measurement distance at this time is considered to be valid when the data of the Q-way data processing unit is identical or close to the data of the I-way data processing unit.
As an alternative embodiment, the I-path data processing unit 12 and the Q-path data processing unit 13 each include a low-noise differential amplification module, a narrowband amplification module, a frequency-adjusting amplification module, and a low-pass filtering module that are sequentially connected. Specifically, the low-noise differential amplification module of the I-path data processing unit 12 is connected with the I-channel of the receiving end of the radar device 11, and the low-noise differential amplification module of the Q-path data processing unit 13 is connected with the Q-channel of the receiving end of the radar device 11; the adjusting frequency-selecting amplifying module of the I-path data processing unit 12 and the adjusting frequency-selecting amplifying module of the Q-path data processing unit 13 are connected with the MCU unit 2; the low-pass filtering module of the I-path data processing unit 12 and the low-pass filtering module of the Q-path data processing unit 13 are connected with the digital-to-analog conversion module 3.
As shown in fig. 2, as an alternative embodiment, each low noise differential amplification module includes a frequency selective amplification circuit 121, and a reference voltage circuit 122 connected to the frequency selective amplification circuit 121. The frequency-selecting amplifying circuit 121 of the I-path data processing unit 12 is connected with an I-channel of the receiving end of the radar device 11, and is used for frequency-selecting and amplifying the I-path echo data; the frequency-selecting amplifying circuit 121 of the Q-path data processing unit 13 is connected with the Q-path of the receiving end of the radar device 11, and is used for frequency-selecting and amplifying the Q-path reference data; the reference voltage circuit 122 is configured to superimpose a reference voltage on the frequency-selective amplifying circuit 122.
It should be noted that, the low-noise differential amplification module of the present embodiment should reduce voltage noise, i.e. current noise, as much as possible, so that the finally collected data can avoid the interference from the in-band noise as much as possible.
As an alternative embodiment, the frequency selective amplifying circuit 121 includes a first operational amplifier U1, a first capacitor C1 and a first resistor R1 connected in series, a second capacitor C2 and a second resistor R2 connected in series, a third capacitor C3 and a third resistor R3 connected in parallel, and a fifth capacitor C5 and a fifth resistor R5 connected in parallel. One polar plate of the second capacitor C2 of the frequency-selecting amplifying circuit 121 of the I-path data processing unit 12 is connected with the I-channel of the receiving end of the radar device 11, and one polar plate of the first capacitor C1 of the frequency-selecting amplifying circuit 121 of the Q-path data processing unit 13 is connected with the Q-channel of the receiving end of the radar device 11 (at this time, the Q-path is used for reference data acquisition, the I-path is used for echo data acquisition, and when the software design changes the data acquisition types of the Q-path and the I-path, the connection relation is correspondingly adjusted and is not repeated here); one end of the first resistor R1 and one end of the second resistor R2 are respectively connected with a No. 3 pin and a No. 4 pin of the first operational amplifier U1; a parallel node of the third capacitor C3 and the third resistor R3 which are connected in parallel is connected between the second resistor R2 and the No. 4 pin of the first operational amplifier U1, and the other parallel node of the third capacitor C3 and the third resistor R3 which are connected in parallel is connected with the No. 1 pin of the first operational amplifier U1; a parallel node of the fifth capacitor C5 and the fifth resistor R5 connected in parallel is connected between the first resistor R1 and pin 3 of the first op-amp U1.
As an alternative embodiment, the reference voltage circuit 122 includes a fourth capacitor C4 and a fourth resistor R4 connected in parallel, a seventh capacitor C7 and an eighth capacitor C8 connected in parallel, and a sixth resistor R6. Wherein, a parallel node of the fourth capacitor C4 and the fourth resistor R4 which are connected in parallel is connected with one end of the sixth resistor R6, and the other parallel node of the fourth capacitor C4 and the fourth resistor R4 which are connected in parallel is grounded; a parallel node of the seventh capacitor C7 and the eighth capacitor C8 which are connected in parallel is connected with the other end of the sixth resistor R6, and the other parallel node of the seventh capacitor C7 and the eighth capacitor C8 which are connected in parallel is connected with the No. 2 pin of the first operational amplifier U1 and is grounded; a voltage VCC is connected to the connection point of the sixth resistor R6, the seventh capacitor C7, the eighth capacitor C8 and the No. 5 pin of the first operational amplifier U1; another parallel node of the fifth capacitor C5 and the fifth resistor R5 connected in parallel is connected between the fourth resistor R4 and the sixth resistor R6.
It should be noted that, the pin No. 1 of the first operational amplifier U1 is output as a data processing result, the output data is V1, the pin No. 3 of the first operational amplifier U1 is used as an input positive terminal, the pin No. 4 is used as an input negative terminal, the pin No. 5 is connected to a high Voltage (VCC), and the pin No. 2 is connected to a low voltage (ground). Further, the amplification factor of the first operational amplifier U1 is not required to be excessively large (generally 5-10 times), so that self-oscillation of the operational amplifier and waveform distortion of the back-end operational amplifier are avoided.
Preferably, the resistance value of the first resistor R1 is equal to the resistance value of the second resistor R2, the resistance value of the third resistor R3 is equal to the resistance value of the fifth resistor R5, the capacitance value of the first capacitor C1 is equal to the capacitance value of the second capacitor C2, and the capacitance value of the third capacitor C3 is equal to the capacitance value of the fifth capacitor C5. Further, the first resistor R1, the second resistor R2, the third resistor R3, the fifth resistor R5, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fifth capacitor C5 perform frequency selection amplification (of course, differential to single-ended frequency selection amplification) on the two paths of signals of the I/Q, and the first capacitor C1 and the second capacitor C2 also have the function of isolating direct current interference. The fourth resistor R4 and the sixth resistor R6 (the resistance value of R4 is generally equal to the resistance value of R6) superimpose a reference voltage VREF on the signal input of the first operational amplifier U1 to avoid the positive and negative peak distortion of the signal. The fourth capacitor C4, the seventh capacitor C7, and the eighth capacitor C8 filter the voltage VCC. Further, if the ranging range of the radar device 11 is: (0-30 m) and the accepted frequency range is: (0-500 KHz), then the frequency selection range of the first resistor R1, the second resistor R2, the third resistor R3, the fifth resistor R5, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fifth capacitor C5 can be all within (0-2 MHz), and the amplification factor is not required to be excessively large (generally 5-10 times).
As shown in fig. 3, as an alternative embodiment, each narrow band amplifying module includes a second operational amplifier U2, a seventh resistor R7 and a ninth capacitor C9 connected in parallel, an eighth resistor R8, a ninth resistor R9, a tenth capacitor C10 and an eleventh capacitor C11 connected in parallel, a twelfth capacitor C12 and a twelfth resistor R12 connected in series, and a thirteenth resistor R13 and a thirteenth capacitor C13 connected in parallel. Wherein, a parallel node of the seventh resistor R7 and the ninth capacitor C9 which are connected in parallel is connected with one end of the eighth resistor R8 and one end of the ninth resistor R9, and the other parallel node of the seventh resistor R7 and the ninth capacitor C9 which are connected in parallel is grounded; a parallel node of the tenth capacitor C10 and the eleventh capacitor C11 which are connected in parallel is connected with the other end of the eighth resistor R8 and the No. 5 pin of the second operational amplifier U2, and the other parallel node of the tenth capacitor C10 and the eleventh capacitor C11 which are connected in parallel is connected with the No. 2 pin of the second operational amplifier U2 and is grounded; the other end of the ninth resistor R9 is connected with a pin 3 of the second operational amplifier U2, a pin 4 of the second operational amplifier U2 is connected with one end of a twelfth resistor R12, a parallel joint point of a thirteenth resistor R13 and a thirteenth capacitor C13 which are connected in parallel is connected with the other parallel joint point of the thirteenth resistor R13 and the thirteenth capacitor C13 which are connected in parallel; one polar plate of the twelfth capacitor C12 is connected with the No. 1 pin of the first operational amplifier U1; and a voltage VCC is connected to the connection part of the eighth resistor R8, the tenth capacitor C10, the eleventh capacitor C11 and the No. 5 pin of the second operational amplifier U2.
The narrowband amplification module is mainly used for narrowband amplification (data after narrowband amplification is V2), and has a fixed selection of the frequency of the signal received by the amplified radar device 11. If the radar ranging range is: (0-30 m) and the acceptable frequency range is (0-600 KHz), then the frequency selection range of the twelfth resistor R12, the twelfth capacitor C12, the thirteenth resistor R13 and the thirteenth capacitor C13 can be set in: (100 KHz-650 KHz), 120KHz corresponds to a distance of 6m, so that the second operational amplifier U2 mainly amplifies the measurement signal of the distance of 6 m-30 m. Because the intensity of the near-distance received signal is high, the amplification saturation is avoided, the narrow-band amplification module does not amplify the near-distance received signal, the receiving intensity of the far-distance signal is weak, and the narrow-band amplification module mainly amplifies the far-distance signal.
As shown in fig. 4, as an alternative embodiment, each of the adjusting frequency selecting amplification modules includes an amplifying circuit 123, a series frequency selecting circuit 124, and a parallel frequency selecting circuit 125. The series frequency selection circuit 124 and the amplifying circuit 123 are both connected to the parallel frequency selection circuit 125.
As an alternative embodiment, the amplifying circuit 123 includes a third operational amplifier U3, a fourteenth resistor R14 and a thirteenth capacitor C14 connected in parallel, a fifteenth resistor R15, a sixteenth resistor R16, a fifteenth capacitor C15 and a sixteenth capacitor C16 connected in parallel. Wherein, a parallel node of the fourteenth resistor R14 and the thirteenth capacitor C14 connected in parallel is connected with one end of the fifteenth resistor R15 and one end of the sixteenth resistor R16, and the other parallel node of the fourteenth resistor R14 and the thirteenth capacitor C14 connected in parallel is grounded; a parallel node of the fifteenth capacitor C15 and the sixteenth capacitor C16 which are connected in parallel is connected with the other end of the fifteenth resistor R15 and the No. 5 pin of the third operational amplifier U3, and the other parallel node of the fifteenth capacitor C15 and the sixteenth capacitor C16 which are connected in parallel is grounded; the other end of the sixteenth resistor R16 is connected with a pin No. 3 of the third operational amplifier U3, and a pin No. 2 of the third operational amplifier U3 is grounded; the voltage VCC is connected to the connection part of the fifteenth resistor R15, the fifteenth capacitor C15, the sixteenth capacitor C16 and the No. 5 pin of the third operational amplifier U3.
As an alternative embodiment, the series frequency selection circuit 124 includes a first analog switch U4, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a seventeenth capacitor C17. One end of the seventeenth resistor R17, one end of the eighteenth resistor R18, and one end of the nineteenth resistor R19 are respectively connected to the pin No. 2, pin No. 3, and pin No. 4 of the first analog switch U4, and the other end of the seventeenth resistor R17, the other end of the eighteenth resistor R18, and the other end of the nineteenth resistor R19 are all connected to one plate of the seventeenth capacitor C17, and the other plate of the seventeenth capacitor C17 is connected to the pin No. 1 of the second operational amplifier U2.
As an alternative embodiment, the parallel frequency selection circuit 125 includes a second analog switch U5, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, and an eighteenth capacitor C18. One end of the twentieth resistor R20, one end of the twenty-first resistor R21 and one end of the twenty-second resistor R22 are respectively connected with a No. 2 pin, a No. 3 pin and a No. 4 pin of the second analog switch U5; one polar plate of the eighteenth capacitor C18 is connected with the No. 4 pin of the third operational amplifier U3, the No. 1 pin of the first analog switch U4, the other end of the twenty-first resistor R20, the other end of the twenty-first resistor R21 and the other end of the twenty-second resistor R22, and the other polar plate of the eighteenth capacitor C18 is connected with the No. 1 pin of the third operational amplifier U3 and the No. 1 pin of the second analog switch U5. The pin 5 and the pin 6 of the first analog switch U4 are respectively connected with a first control signal P1 and a second control signal P2, the pin 5 and the pin 6 of the second analog switch U5 are respectively connected with a third control signal P3 and a fourth control signal P4, and the first control signal P1, the second control signal P2, the third control signal P3 and the fourth control signal P4 are generated by the MCU unit 2; and an output end is arranged at the joint of the No. 1 pin of the third operational amplifier U3 and the No. 1 pin of the second analog switch U5, and the output end is connected with the digital-to-analog conversion module.
It should be noted that, the adjusting frequency-selecting amplifying module automatically adjusts the resistance and capacitance value of frequency-selecting amplifying according to the measured distance information, so as to adjust the effect of frequency-selecting amplifying for different distances, so as to adapt to the radar data stability measurement under different distances. Combining the parallel frequency selection circuit 125 and the series frequency selection circuit 124 provides a frequency selection amplification effect within a passband. The seventeenth capacitor C17 and the seventeenth resistor R17, the eighteenth resistor R18 and the nineteenth resistor R19 play a role in series frequency selection, and the eighteenth capacitor C18 and the twentieth resistor R20, the twenty-first resistor R21 and the twenty-second resistor R22 play a role in parallel frequency selection. The first analog switch U4 and the second analog switch U5 are two analog switches selected from 3, and the gating of the first analog switch U4 and the second analog switch U5 is controlled by control signals (P1, P2), (P3, P4), respectively. Wherein for each analog switch (0, 0) corresponds to all switches being off, (1, 0) corresponds to switch k1 being on, (0, 1) corresponds to switch k2 being on, and (1, 1) corresponds to switch k3 being on.
One specific embodiment is as follows:
if the radar range is (0-30 m), the accepted frequency range is (0-600 KHz), and 1m corresponds to 20 KHz. Setting the capacitance c17=0.01 uF of the seventeenth capacitor C17, the resistance r17=100deg.R of the seventeenth resistor R17, the resistance r18=1k of the eighteenth resistor R18 and the resistance r19=10k of the nineteenth resistor R19, and according to the turning frequency calculation formula (1), the turning frequencies f corresponding to the resistors R17-R19 are 159.2KHz, 15.92KHz and 1.592KHz respectively; the capacitive value c18=10pf of the eighteenth capacitor C18, the resistive value r20=25k of the twentieth resistor R20, the resistive value r21=50k of the twenty-first resistor R21, and the resistive value r22=100deg.C of the twenty-second resistor R22, and the turning frequencies f corresponding to the resistors R20-R22 are 637KHZ, 319KHZ, 160KHZ, respectively, according to the formula (1). The turning frequency is calculated as:
f＝1/(2π×r×c)(1)；
Wherein r is a resistance value, and c is a capacitance value. The unit of R is R (omega), the unit of c is F, and the unit corresponding to F calculated finally is KHz.
If the distance tested is 25m, the corresponding frequency is 500KHZ. The signal energy corresponding to 500KHZ will be relatively weak and the measured signal amplitude will be low, at which time the frequency band around this frequency will be amplified. Automatically adjusting the values of the first and second control signals (P1, P2) to (1, 0), gating the seventeenth resistor R17 (corresponding turning frequency f=159.2 KHz, i.e. not amplifying for distances below 8 m); the values of the third and fourth control signals (P3, P4) are automatically adjusted to (1, 0), and the twentieth resistor R20 (corresponding to the turning frequency f=637khz) is gated. The whole circuit amplifies the frequency in the frequency range of 159.2 KHz-637 KHz, and the amplification factor=r20/r17=250.
If the distance tested is 2m, the corresponding frequency is 40KHZ. Because of the close distance, the received signal energy is quite strong, and the measured signal amplitude is high, the frequency band near the frequency is not amplified or the amplification factor is small, so that the signal over-amplification distortion is avoided. Automatically adjusting the values of the first and second control signals (P1, P2) to be (1, 1), and gating the nineteenth resistor R19 (corresponding turning frequency f= 1.592KHz, i.e. not amplifying the distance below 8 cm); the third and fourth control signal adjustment (P3, P4) strobes are automatically adjusted to 11 strobe the twenty-second resistor R22 (corresponding turning frequency f=160 KHz). The whole circuit amplifies the frequency in the frequency range of 1.592-160 KHz, and the amplification factor=r21/r19=10.
Thus, the signals with high short-distance energy intensity and high amplitude are amplified without amplification or as little as possible; and amplifying signals with low remote energy weak amplitude as much as possible under the condition of ensuring the signal quality so as to adapt to radar data stability measurement under different distances.
In summary, according to the system for improving the stability of radar data in this embodiment, the radar receiving signal is automatically and adjustably filtered and amplified at an intermediate frequency, so that the system can be suitable for radar data stability measurement under different distances.
It should be noted that this embodiment is only a specific example, and does not indicate such an implementation of the present invention.
Embodiment two:
as shown in fig. 5-6, the present embodiment provides a radar water gauge, which includes a system for improving radar data stability according to the first embodiment, and further includes an upper cover 4, a lower cover 5, and an external interface 6. The system for improving the stability of radar data further comprises a communication unit 7 connected with the MCU unit 2, a heat dissipation structure 8 arranged on the radar unit 1 and a power management unit 9 connected with the MCU unit 2 and the radar unit 1. The radar unit 1, the MCU unit 2, the digital-to-analog conversion module 3, the communication unit 7, the heat dissipation structure 8 and the power management unit 9 are integrated on a PCB, the PCB is arranged between the upper cover 4 and the lower cover 5, and the MCU unit 2 is communicated with the external interface 6.
Preferably, the radar device 11 is a 120GHz radar chip, and the model is TRX_120_001; the radar device 11 is integrated with a receiving antenna and a transmitting antenna, the antenna is a lens antenna, the lower cover 5 is a radar lens cover, the lower cover 5 plays a role in focusing radar signals, the radar signals can be transmitted at a smaller transmitting angle, more concentrated energy is provided, echo signals are stronger, and under the same working condition, the radar device has higher stability compared with other radar schemes.
As shown in fig. 7, as an alternative embodiment, the power management unit 9 includes a direct current regulator DC-DC, a plurality of low dropout linear regulators LDOs, and a plurality of software switches p. The input voltage 12V of the power management unit 9 is reduced to 3.6V by a DC-DC voltage regulator. The voltage of 3.6V is reduced to 3.3V after passing through the first low dropout linear regulator LDO1 and is directly supplied to the MCU unit 2; the 3.6V voltage is controlled by the first software switch p1, and is reduced to 3.3V after passing through the second low dropout linear regulator LDO2 to be supplied to the communication unit 7; the 3.6V voltage is respectively controlled by the second software switch p2, the third software switch p3 and the fourth software switch p4, is respectively reduced to 3.3V after passing through the third low dropout linear regulator LDO3 and is supplied to the radar unit 1, is reduced to 1.8V after passing through the fourth low dropout linear regulator LDO4 and is supplied to the radar unit 1, and is reduced to 1.2V after passing through the fifth low dropout linear regulator LDO5 and is supplied to the radar unit 1. Wherein 3.3V is the main power supply of the radar unit 1, 1.8V is the phase-locked loop part of the radar unit 1, and 1.2V is the transmitting end power supply of the radar unit. The radar water level gauge of the embodiment controls the acquisition interval and the acquisition time of the radar unit 1 through software switches such as p1, p2, p3 and p4, controls the switch of the communication unit 7, and keeps the operation management of the lowest power consumption of the radar water level gauge under the condition of meeting the normal operation of products. Specifically, the low power consumption management flow is as follows:
(1) The RTC wakes up the MCU unit 2;
(2) Respectively powering up the radar unit 1 and the communication unit 7 according to the requirement;
(3) Acquiring radar unit 1 data;
(3) Transmitting radar data to the upper computer through the communication unit 7;
(4) Powering down the radar unit 1 and the communication unit 7;
(5) The MCU unit 2 is dormant.
In summary, the radar level gauge according to the present embodiment has the following features:
(1) The transmitting antenna and the receiving antenna are all integrated on the chip, so that the design of a developer is facilitated, and the design cost and time are correspondingly reduced; the 120GHz radar has higher measurement precision and small measurement blind area; (2) The multiple lens antennas have smaller emission angles, more concentrated energy, stronger echo signals and higher stability compared with other radar schemes under the same working condition; (3) The excellent radar signal processing method carries out automatic adjustable intermediate frequency filtering amplification on the radar receiving signal, and can adapt to radar data stability measurement under different distances; (4) And the reliable operation of the radar unit and the low-power-consumption operation of the whole equipment are ensured by scientific and reasonable power supply control. The foregoing is only illustrative of the preferred embodiments of the application, and it will be appreciated by those skilled in the art that various changes in the features and embodiments may be made and equivalents may be substituted without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. The system for improving the stability of radar data is characterized by comprising a radar unit, an MCU unit connected with the radar unit and a digital-to-analog conversion module connected with the MCU unit;
the radar unit comprises a radar device, an I-path data processing unit and a Q-path data processing unit which are connected with the radar device; the I-path data processing unit and the Q-path data processing unit are respectively connected with the MCU unit and the digital-to-analog conversion module;
the I-path data processing unit acquires echo data of the radar device; the Q-path data processing unit acquires reference data corresponding to echo data; when the data of the I-path data processing unit is consistent with or close to the data of the Q-path data processing unit, the MCU unit acquires the data from the I-path data processing unit and the Q-path data processing unit through the digital-to-analog conversion module, calculates the detection distance of the radar device according to the acquired data, and outputs a control signal according to the calculated detection distance to control the I-path data processing unit and the Q-path data processing unit to perform reverse frequency selection amplification on I, Q two paths of data;
the I-path data processing unit and the Q-path data processing unit comprise a low-noise differential amplification module, a narrow-band amplification module, an adjusting frequency-selecting amplification module and a low-pass filtering module which are connected in sequence;
The low-noise differential amplification module of the I-path data processing unit is connected with an I channel of the radar device receiving end, and the low-noise differential amplification module of the Q-path data processing unit is connected with a Q channel of the radar device receiving end; the adjusting frequency-selecting amplifying module of the I-path data processing unit and the adjusting frequency-selecting amplifying module of the Q-path data processing unit are connected with the MCU unit; the low-pass filter module of the I-path data processing unit and the low-pass filter module of the Q-path data processing unit are connected with the digital-to-analog conversion module;
each low-noise differential amplification module comprises a frequency-selecting amplification circuit and a reference voltage circuit connected with the frequency-selecting amplification circuit;
the frequency-selecting amplifying circuit of the I-path data processing unit is connected with an I-path of the radar device receiving end and is used for frequency-selecting and amplifying the I-path echo data; the frequency-selecting amplifying circuit of the Q-path data processing unit is connected with a Q-path of the radar device receiving end and is used for frequency-selecting and amplifying Q-path reference data; the reference voltage circuit is used for superposing a reference voltage on the frequency-selecting amplifying circuit.
2. The system for improving the stability of radar data according to claim 1, wherein the frequency selective amplifying circuit comprises a first operational amplifier U1, a first capacitor C1 and a first resistor R1 connected in series, a second capacitor C2 and a second resistor R2 connected in series, a third capacitor C3 and a third resistor R3 connected in parallel, and a fifth capacitor C5 and a fifth resistor R5 connected in parallel;
A polar plate of a second capacitor C2 of the frequency-selecting amplifying circuit of the I-path data processing unit is connected with an I-path of the radar device receiving end; a polar plate of a first capacitor C1 of the frequency-selecting amplifying circuit of the Q-channel data processing unit is connected with a Q channel of the radar device receiving end;
one end of the first resistor R1 and one end of the second resistor R2 are respectively connected with a No. 3 pin and a No. 4 pin of the first operational amplifier U1;
a parallel node of the third capacitor C3 and the third resistor R3 which are connected in parallel is connected between the second resistor R2 and the No. 4 pin of the first operational amplifier U1, and the other parallel node of the third capacitor C3 and the third resistor R3 which are connected in parallel is connected with the No. 1 pin of the first operational amplifier U1;
a parallel node of the fifth capacitor C5 and the fifth resistor R5 connected in parallel is connected between the first resistor R1 and pin 3 of the first op-amp U1.
3. The system for improving the stability of radar data according to claim 2, wherein the reference voltage circuit comprises a fourth capacitor C4 and a fourth resistor R4 connected in parallel, a seventh capacitor C7 and an eighth capacitor C8 connected in parallel, and a sixth resistor R6;
one parallel node of the fourth capacitor C4 and the fourth resistor R4 which are connected in parallel is connected with one end of the sixth resistor R6, and the other parallel node of the fourth capacitor C4 and the fourth resistor R4 which are connected in parallel is grounded;
A parallel node of the seventh capacitor C7 and the eighth capacitor C8 which are connected in parallel is connected with the other end of the sixth resistor R6, and the other parallel node of the seventh capacitor C7 and the eighth capacitor C8 which are connected in parallel is connected with the No. 2 pin of the first operational amplifier U1 and is grounded;
a voltage VCC is connected to the connection point of the sixth resistor R6, the seventh capacitor C7, the eighth capacitor C8 and the No. 5 pin of the first operational amplifier U1;
the other parallel node of the fifth capacitor C5 and the fifth resistor R5 is connected between the fourth resistor R4 and the sixth resistor R6.
4. The system for improving the stability of radar data according to claim 2, wherein each of the narrow-band amplifying modules comprises a second operational amplifier U2, a seventh resistor R7 and a ninth capacitor C9 connected in parallel, an eighth resistor R8, a ninth resistor R9, a tenth capacitor C10 and an eleventh capacitor C11 connected in parallel, a twelfth capacitor C12 and a twelfth resistor R12 connected in series, and a thirteenth resistor R13 and a thirteenth capacitor C13 connected in parallel;
a parallel node of the seventh resistor R7 and the ninth capacitor C9 which are connected in parallel is connected with one end of the eighth resistor R8 and one end of the ninth resistor R9, and the other parallel node of the seventh resistor R7 and the ninth capacitor C9 which are connected in parallel is grounded;
A parallel node of the tenth capacitor C10 and the eleventh capacitor C11 which are connected in parallel is connected with the other end of the eighth resistor R8 and the No. 5 pin of the second operational amplifier U2, and the other parallel node of the tenth capacitor C10 and the eleventh capacitor C11 which are connected in parallel is connected with the No. 2 pin of the second operational amplifier U2 and is grounded;
the other end of the ninth resistor R9 is connected with a pin 3 of the second operational amplifier U2, a pin 4 of the second operational amplifier U2 is connected with one end of a twelfth resistor R12, a parallel joint point of a thirteenth resistor R13 and a thirteenth capacitor C13 which are connected in parallel is connected with the other parallel joint point of the thirteenth resistor R13 and the thirteenth capacitor C13 which are connected in parallel;
one polar plate of the twelfth capacitor C12 is connected with the No. 1 pin of the first operational amplifier U1;
the voltage VCC is connected to the connection of the eighth resistor R8, the tenth capacitor C10, the eleventh capacitor C11 and pin 5 of the second operational amplifier U2.
5. The system for improving the stability of radar data of claim 4, wherein each of said adjusting and frequency-selective amplification modules comprises an amplification circuit, a series frequency-selective circuit, and a parallel frequency-selective circuit;
and the series frequency selection circuit and the amplifying circuit are both connected with the parallel frequency selection circuit.
6. The system for improving radar data stability according to claim 5, wherein the amplifying circuit comprises a third operational amplifier U3, a fourteenth resistor R14 and a thirteenth capacitor C14 connected in parallel, a fifteenth resistor R15, a sixteenth resistor R16, a fifteenth capacitor C15 and a sixteenth capacitor C16 connected in parallel;
a parallel node of the fourteenth resistor R14 and the thirteenth capacitor C14 which are connected in parallel is connected with one end of the fifteenth resistor R15 and one end of the sixteenth resistor R16, and the other parallel node of the fourteenth resistor R14 and the thirteenth capacitor C14 which are connected in parallel is grounded;
a parallel node of the fifteenth capacitor C15 and the sixteenth capacitor C16 which are connected in parallel is connected with the other end of the fifteenth resistor R15 and the No. 5 pin of the third operational amplifier U3, and the other parallel node of the fifteenth capacitor C15 and the sixteenth capacitor C16 which are connected in parallel is grounded;
the other end of the sixteenth resistor R16 is connected with a pin No. 3 of the third operational amplifier U3, and a pin No. 2 of the third operational amplifier U3 is grounded;
the voltage VCC is connected to the connection of the fifteenth resistor R15, the fifteenth capacitor C15, the sixteenth capacitor C16 and pin 5 of the third operational amplifier U3.
7. The system for improving radar data stability according to claim 6, wherein the series frequency selection circuit comprises a first analog switch U4, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a seventeenth capacitor C17;
One end of a seventeenth resistor R17, one end of an eighteenth resistor R18 and one end of a nineteenth resistor R19 are respectively connected with a No. 2 pin, a No. 3 pin and a No. 4 pin of the first analog switch U4, the other end of the seventeenth resistor R17, the other end of the eighteenth resistor R18 and the other end of the nineteenth resistor R19 are connected with one polar plate of a seventeenth capacitor C17, and the other polar plate of the seventeenth capacitor C17 is connected with the No. 1 pin of the second operational amplifier U2;
the parallel frequency selection circuit comprises a second analog switch U5, a twenty-first resistor R20, a twenty-second resistor R21, a twenty-second resistor R22 and an eighteenth capacitor C18;
one end of a twenty-first resistor R20, one end of a twenty-first resistor R21 and one end of a twenty-second resistor R22 are respectively connected with a No. 2 pin, a No. 3 pin and a No. 4 pin of the second analog switch U5;
one polar plate of the eighteenth capacitor C18 is connected with the pin No. 4 of the third operational amplifier U3, the pin No. 1 of the first analog switch U4, the other end of the twentieth resistor R20, the other end of the twenty-first resistor R21 and the other end of the twenty-second resistor R22, and the other polar plate of the eighteenth capacitor C18 is connected with the pin No. 1 of the third operational amplifier U3 and the pin No. 1 of the second analog switch U5;
The pin 5 and the pin 6 of the first analog switch U4 are respectively connected with a first control signal P1 and a second control signal P2, the pin 5 and the pin 6 of the second analog switch U5 are respectively connected with a third control signal P3 and a fourth control signal P4, and the first control signal P1, the second control signal P2, the third control signal P3 and the fourth control signal P4 are generated by the MCU unit;
and an output end is arranged at the joint of the No. 1 pin of the third operational amplifier U3 and the No. 1 pin of the second analog switch U5, and the output end is connected with the digital-to-analog conversion module.
8. A radar water gauge, comprising a system for improving radar data stability according to any one of claims 1-7, further comprising an upper cover, a lower cover and an external interface;
the system for improving the stability of radar data further comprises a communication unit connected with the MCU unit, a heat dissipation structure arranged on the radar unit and a power management unit connected with the MCU unit and the radar unit;
the radar unit, the MCU unit, the digital-to-analog conversion module, the communication unit, the heat dissipation structure and the power management unit are integrated on a PCB (printed circuit board), the PCB is arranged between the upper cover and the lower cover, and the MCU unit is communicated with the external interface;
The radar device is integrated with a receiving antenna and a transmitting antenna.
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