CN112485780A - Radar-measuring material three-dimensional material level sensor system with phased array antenna - Google Patents
Radar-measuring material three-dimensional material level sensor system with phased array antenna Download PDFInfo
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- CN112485780A CN112485780A CN202011220985.0A CN202011220985A CN112485780A CN 112485780 A CN112485780 A CN 112485780A CN 202011220985 A CN202011220985 A CN 202011220985A CN 112485780 A CN112485780 A CN 112485780A
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- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
- G01S13/426—Scanning radar, e.g. 3D radar
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/354—Extracting wanted echo-signals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
Abstract
The invention discloses a radar material three-dimensional level sensor system with a phased array antenna, which comprises: the hardware component and the software component are used for controlling and adjusting the hardware component, and the software component comprises a microcontroller; the hardware component comprises a receiving channel and a transmitting channel, the receiving channel and the transmitting channel are in signal connection with a microcontroller, the receiving channel and the transmitting channel are connected with a phased array transceiving antenna through a high-speed electric control switch, the phased array transceiving antenna comprises a plurality of channels, and each channel comprises an electric control phase shifter, an amplifier (attenuator) in signal connection with the electric control phase shifter and an antenna unit in signal connection with the amplifier (attenuator). According to the invention, the phased array antenna technology is utilized, and a single-transmitting and single-receiving frequency modulation continuous wave radar system is combined to realize the measurement of the three-dimensional material level of the material.
Description
Technical Field
The invention relates to the technical field of radar level gauges, in particular to a radar three-dimensional level sensor system with a phased array antenna for measuring materials.
Background
The radar level gauge has the advantages of non-contact working mode, real-time sensing and various complex environments, and is widely applied to material level measurement. According to the difference of radar working signals, the radar can be divided into a pulse system radar and a frequency modulation continuous wave system radar, compared with the pulse system radar, the frequency modulation continuous wave system radar has obvious advantages when being applied to the field of level meters, can adopt working signals of different modulation modes according to different target information to be detected, can detect long-distance target information with smaller transmitting power, and has the characteristics of low power consumption and high flexibility.
However, most of the existing frequency modulation continuous wave radar level meters are in single-point measurement mode, that is, the material height of a certain point is measured, and the three-dimensional level of the material in the whole storage bin cannot be obtained at the same time. The three-dimensional material level image detection of the material is realized, and the wave beam of the frequency modulation continuous wave radar is required to have a scanning function. The mechanical control radar beam scanning is one of the modes of realizing three-dimensional level image detection by a frequency modulation continuous wave radar level meter. The radar realizes two-dimensional scanning of beams by controlling the swinging and rotation of a radar antenna by using a mechanical means. However, the beam scanning speed of the mechanical scanning is slow, and the introduction of the mechanical control system increases the complexity, power consumption, weight and volume of the level meter, so that the level meter has poor resistance to external mechanical vibration and reduced reliability. The other is to realize three-dimensional material level information measurement of materials through multiple transmitting and receiving channels. Each transmit and receive channel of the radar level gauge is an active channel of an integrated phase shifter, wherein each receive channel also requires an integrated mixer, resulting in a high system complexity and a significant cost increase.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a radar material three-dimensional level measuring sensor system with a phased array antenna, which realizes the measurement of a material three-dimensional level by utilizing the phased array antenna technology and combining a single-transmitting and single-receiving frequency modulation continuous wave radar system. To achieve the above objects and other advantages in accordance with the purpose of the invention, there is provided a radar-based three-dimensional level sensor system having a phased array antenna for measuring a material, including:
the hardware component and the software component are used for controlling and adjusting the hardware component, and the software component comprises a microcontroller;
the hardware component comprises a receiving channel and a transmitting channel, the receiving channel and the transmitting channel are in signal connection with a microcontroller, the receiving channel and the transmitting channel are connected with a phased array transceiving antenna through a high-speed electric control switch, the phased array transceiving antenna comprises a plurality of channels, each channel comprises an electric control phase shifter, an amplifier in signal connection with the electric control phase shifter and an antenna unit in signal connection with the amplifier, and the amplifier can be replaced by an attenuator.
Preferably, the transmission channel includes a phase-locked loop, a voltage-controlled oscillator in signal connection with the phase-locked loop, a power divider in signal connection with the voltage-controlled oscillator, and a power amplifier in signal connection with the power divider, where the power divider may also be replaced by a coupler.
Preferably, the receiving channel includes an a/D converter, a controllable gain amplifier in signal connection with the a/D converter, a filter in signal connection with the controllable gain amplifier, a mixer in signal connection with the filter, and a low noise amplifier in signal connection with the mixer.
Preferably, the phase-locked loop and the voltage-controlled oscillator are configured to generate a frequency-modulated continuous wave signal, the power divider is configured to divide the frequency-modulated continuous wave radio-frequency signal into one path of signal for mixing with the received echo signal to generate an intermediate-frequency signal, and the power amplifier is configured to amplify and obtain a radio-frequency signal with sufficient power.
Preferably, the a/D converter is configured to convert the output intermediate-frequency analog signal into a digital signal, the controllable gain amplifier is configured to change corresponding gains according to different detection targets and distances and output an intermediate-frequency signal including target information, the filter is configured to filter a high-frequency harmonic signal to obtain the intermediate-frequency signal, the mixer is configured to mix a local oscillator signal of power division and a received echo signal to obtain an intermediate-frequency signal, and the low-noise amplifier is configured to amplify the received echo signal.
Preferably, the working frequency band of the system is a microwave, millimeter wave or terahertz frequency band, the microcontroller is used for controlling devices in the receiving channel and the transmitting channel and realizing radar digital signal processing, and the microcontroller acquires target position and target characteristic information.
Compared with the prior art, the invention has the beneficial effects that:
(1) the single transmitting channel and the single receiving channel in the system time division multiplex a set of phased array antenna, the switching between the transmitting channel and the receiving channel is controlled by the high-speed electric control switch, the beam scanning is completed, the three-dimensional material level measurement of the material in the storage bin is realized, and the system has the characteristics of simple structure and low cost.
(2) Compared with the pulse system radar level gauge, the system of the invention adopts the frequency modulation continuous wave system radar level gauge, can change the modulation mode according to different target information to be obtained, can detect the remote target information with less power and has high flexibility.
(3) The radar system only comprises a transmitting channel and a receiving channel, the transmitting channel and the receiving channel are time division multiplexed with a phased array antenna, a high-speed electric control switch is used for controlling the phased array antenna to switch between the transmitting channel and the receiving channel, each channel in the phased array consists of an electric control phase shifter, an amplifier (attenuator) and an antenna unit, the electric control phase shifter is used for adjusting the phase of a feed channel antenna unit, further controlling the main radiation beam scanning angle of the antenna array, and performing beam scanning from two dimensions of an azimuth angle and a pitch angle to cover the distribution area of materials and finish the detection of the materials.
Drawings
FIG. 1 is a block diagram of a radar-based three-dimensional level sensor system with phased array antennas for measuring a material according to the present invention.
In the figure: 1. a microcontroller; 2. a phase-locked loop; 3. a voltage controlled oscillator; 4. a power divider (coupler); 5. a power amplifier; 6. an electrically controlled phase shifter; 7. an amplifier; 8. an antenna unit; an A/D converter; 10. a controllable gain amplifier; 11. a filter; 12. a mixer; 13. a low noise amplifier.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a radar measuring material three-dimensional level sensor system with a phased array antenna, comprising: the hardware component and the software component are used for controlling and adjusting the hardware component, and the software component comprises a Microcontroller (MCU) 1;
the hardware component comprises a receiving channel and a transmitting channel, the receiving channel and the transmitting channel are in signal connection with a microcontroller 1, the receiving channel and the transmitting channel are connected with a phased array transceiving antenna through a high-speed electric control switch, the phased array transceiving antenna comprises a plurality of channels, each channel comprises an electric control phase shifter 6, an amplifier (attenuator) 7 in signal connection with the electric control phase shifter 6 and an antenna unit 8 in signal connection with the amplifier (attenuator) 7, the amplifier (attenuator) 7 is used for amplifying (attenuating) the signal power entering the channel, the electric control phase shifter 6 is used for adjusting the phase of the antenna unit 8 of a feed channel, further controlling the main radiation beam scanning angle of the antenna array, and performing beam scanning from two dimensions of an azimuth angle and a pitch angle to cover the distribution area of the material and finish the detection of the material, all phased array antenna channels are combined into one channel through a power synthesizer, one channel of phased array signals is connected with a transmitting/receiving channel of a radar through a high-speed electric control switch, the transmitting channel and the receiving channel share one set of phased array transmitting/receiving antenna, transmitting/receiving time division multiplexing switching of the phased array antenna, the transmitting channel and the receiving channel is realized through the high-speed electric control switch, frequency modulation continuous wave signals generated by the system are switched to a phased array antenna unit 8 through the switch, the signals are transmitted to a detection area, the signals are reflected after encountering a target object, the reflected signals are received through the phased array antenna unit 8, at the moment, the switch is switched to the receiving channel, echo signals and local oscillation signals are mixed through a mixer of the receiving channel, intermediate frequency signals carrying material position and target characteristic information are obtained, and the receiving channel and the transmitting channel share one microcontroller 1, the microcontroller 1 is configured to control a Voltage Controlled Oscillator (VCO) 3 and a Phase Locked Loop (PLL) 2 of the transmit channel to generate a frequency modulated continuous wave signal, control a controllable gain amplifier 10 of the receive channel, and perform digital signal processing on a digital sampling intermediate frequency signal output by the receive channel to obtain target information.
Further, the transmitting channel includes a phase-locked loop 2, a voltage-controlled oscillator 3 in signal connection with the phase-locked loop 2, a power divider (coupler) 4 in signal connection with the voltage-controlled oscillator 3, and a power amplifier 5 in signal connection with the power divider (coupler) 4, the phase-locked loop 2 and the voltage-controlled oscillator 3 are configured to generate a frequency-modulated continuous wave signal, the power divider (coupler) 4 is configured to divide the frequency-modulated continuous wave radio frequency signal into one path of signal for frequency mixing with a received echo signal to generate an intermediate frequency signal, and the power amplifier 5 is configured to amplify and obtain a radio frequency signal with sufficient power, and transmit the radio frequency signal through a phased array antenna.
Further, the receiving channel includes an a/D converter 9, a controllable gain amplifier 10 in signal connection with the a/D converter 9, a filter 11 in signal connection with the controllable gain amplifier 10, a mixer 12 in signal connection with the filter 11, and a low noise amplifier 13 in signal connection with the mixer 12, where the a/D converter 9 is configured to convert an output intermediate frequency analog signal into a digital signal so as to perform digital signal processing subsequently to obtain target information, the controllable gain amplifier 10 is controlled by the microcontroller 1, the controllable gain amplifier 10 is configured to change corresponding gains according to different detection targets and distances and output an intermediate frequency signal containing the target information, the filter 11 is configured to filter out high frequency harmonic signals to obtain intermediate frequency signals, and the mixer 12 is configured to mix the power-divided local oscillation signals and the received echo signals, an intermediate frequency signal is obtained and the low noise amplifier 13 is used to amplify the received echo signal.
Further, the working frequency band of the system is a microwave, millimeter wave or terahertz frequency band, the microcontroller 1 is used for controlling devices in the receiving channel and the transmitting channel and realizing radar digital signal processing, and the microcontroller 1 acquires target position and target characteristic information.
Furthermore, the frequency mixer in the system mixes the local oscillator signal generated by the system itself with the echo signal reflected by the target, and the local oscillator signal has a frequency fTThe frequency of the received echo signal is fRAfter the mixer, two frequencies f are obtainedT+fRAnd fT-fRThe filter filters out high-frequency harmonics and then obtains an intermediate-frequency signal f containing target informationT-fR。
The system is a frequency modulation continuous wave radar system, and can generate a frequency modulation continuous wave signal with a certain modulation rule, the signal is transmitted out through a phased array antenna unit 8, and then is reflected when encountering a target object, an echo signal carrying material position and target characteristic information is received through the phased array antenna unit 8, and is switched to a receiving channel through a high-speed electric control switch, and an intermediate frequency signal is obtained by mixing with a local oscillator signal, and the intermediate frequency signal is subjected to A/D digital sampling and digital signal processing, and the position and the target characteristic information of the target object are extracted.
The number of devices and the scale of the processes described herein are intended to simplify the description of the invention, and applications, modifications and variations of the invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. A radar-based three-dimensional level sensor system for measuring a material with a phased array antenna, comprising:
a hardware component and a software component for controlling the adjustment of the hardware component, the software component comprising a microcontroller (1);
the hardware component comprises a receiving channel and a transmitting channel, the receiving channel and the transmitting channel are in signal connection with a microcontroller (1), the receiving channel and the transmitting channel are connected with a phased array transceiving antenna through a high-speed electric control switch, the phased array transceiving antenna comprises a plurality of channels, and each channel comprises an electric control phase shifter (6), an amplifier (7) in signal connection with the electric control phase shifter (6) and an antenna unit (8) in signal connection with the amplifier (7).
2. The radar-based three-dimensional level sensor system with a phased array antenna for measuring a material according to claim 1, characterized in that the transmission channel comprises a phase locked loop (2), a voltage controlled oscillator (3) in signal connection with the phase locked loop (2), a power divider (4) in signal connection with the voltage controlled oscillator (3) and a power amplifier (5) in signal connection with the power divider (4).
3. A radar measuring three-dimensional level sensor system for a material with a phased array antenna according to claim 1, characterised in that the receiving channel comprises an a/D converter (9), a controllable gain amplifier (10) in signal connection with the a/D converter (9), a filter (11) in signal connection with the controllable gain amplifier (10), a mixer (12) in signal connection with the filter (11) and a low noise amplifier (13) in signal connection with the mixer (12).
4. The radar-based three-dimensional level sensor system with phased array antenna for measuring material according to claim 2, characterized in that said phase locked loop (2) is used with a voltage controlled oscillator (3) for generating a frequency modulated continuous wave signal, said power divider (4) is used for dividing the frequency modulated continuous wave radio frequency signal into a branch signal for mixing with the received echo signal to generate an intermediate frequency signal, and said power amplifier (5) is used for amplifying and obtaining a radio frequency signal of sufficient power.
5. The system as claimed in claim 3, wherein the A/D converter (9) is configured to convert the output intermediate frequency analog signal into a digital signal, the controllable gain amplifier (10) is configured to change the corresponding gain according to different detected targets and distances and output an intermediate frequency signal containing target information, the filter (11) is configured to filter out high frequency harmonic signals to obtain an intermediate frequency signal, the mixer (12) is configured to mix the power divided local oscillator signal with the received echo signal to obtain an intermediate frequency signal, and the low noise amplifier (13) is configured to amplify the received echo signal.
6. The system as claimed in claim 1, wherein the operating frequency band of the system is microwave, millimeter wave or terahertz frequency band, and the microcontroller (1) is used for controlling the devices in the receiving channel and the transmitting channel and realizing radar digital signal processing, and the microcontroller (1) acquires the target position and target characteristic information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011220985.0A CN112485780A (en) | 2020-11-05 | 2020-11-05 | Radar-measuring material three-dimensional material level sensor system with phased array antenna |
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| CN202011220985.0A CN112485780A (en) | 2020-11-05 | 2020-11-05 | Radar-measuring material three-dimensional material level sensor system with phased array antenna |
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Cited By (5)
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| CN113376622A (en) * | 2021-04-29 | 2021-09-10 | 中国科学院空天信息创新研究院 | Millimeter wave phased array radar with low link loss and detection method thereof |
| CN114325715A (en) * | 2022-03-11 | 2022-04-12 | 南京隼眼电子科技有限公司 | Radar structure and system |
| CN114826342A (en) * | 2022-06-24 | 2022-07-29 | 绍兴圆方半导体有限公司 | Radio frequency front end chip and radio frequency front end for base station |
| CN117053894A (en) * | 2023-09-15 | 2023-11-14 | 济宁华瑞自动化技术有限公司 | 3D radar level scanner based on phased array |
| CN117053894B (en) * | 2023-09-15 | 2024-04-19 | 济宁华瑞自动化技术有限公司 | 3D radar level scanner based on phased array |
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| CN117053894B (en) * | 2023-09-15 | 2024-04-19 | 济宁华瑞自动化技术有限公司 | 3D radar level scanner based on phased array |
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