CN114735558A - Elevator system adopting radar ranging - Google Patents
Elevator system adopting radar ranging Download PDFInfo
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- CN114735558A CN114735558A CN202210349959.0A CN202210349959A CN114735558A CN 114735558 A CN114735558 A CN 114735558A CN 202210349959 A CN202210349959 A CN 202210349959A CN 114735558 A CN114735558 A CN 114735558A
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- reflecting surface
- radar
- reflector
- electromagnetic wave
- elevator system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
- B66B3/02—Position or depth indicators
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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
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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
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Aerials With Secondary Devices (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses an elevator system adopting radar for ranging, which belongs to the technical field of elevators and comprises an elevator car, an elevator shaft, a radar and a left-handed material reflector, wherein the radar comprises a transmitting antenna and a receiving antenna; one of the radar and the left-handed material reflector is connected to the top of the elevator car, and the other reflector is connected to the top of the elevator shaft; the electromagnetic wave transmitted by the transmitting antenna is the transmitted electromagnetic wave, the transmitted electromagnetic wave can be reflected by the left-handed material reflector to obtain the reflected electromagnetic wave vertical to the linear polarization direction of the transmitted electromagnetic wave, and the receiving antenna receives the electromagnetic wave vertical to the linear polarization direction of the transmitted electromagnetic wave. An elevator system employing radar ranging ensures accuracy in measuring the position and speed of an elevator car in an elevator hoistway.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to an elevator system adopting radar ranging.
Background
In order to monitor the operating state of an elevator, it is necessary to measure the position and speed of the elevator car in the elevator shaft. In the prior art, distance measurements are made by means of radars and reflectors, so that the position and speed of the elevator car are obtained.
When the millimeter wave radar is used for measuring the position and the speed of the elevator car in the hoistway, the millimeter wave radar and the reflector are respectively installed at the top end of the elevator car and the top end of the hoistway, electromagnetic waves transmitted by a transmitting antenna of the millimeter wave radar are received by a receiving antenna of the millimeter wave radar after being reflected by the reflector, the distance between the millimeter wave radar and the reflector can be calculated by measuring the time (the flight time of the electromagnetic waves) from the time when electromagnetic wave signals are transmitted to the time when the electromagnetic wave signals are received and combining the light speed, and therefore the position and the speed of the elevator car in the hoistway can be calculated.
Because the direction of the transmitting antenna can not be infinitely concentrated, when the distance between the radar and the reflector is large, a part of electromagnetic waves are transmitted to the place outside the reflector and then reflected back to the radar, and the part of signals are interference signals, so that the measurement precision is reduced, and the accuracy of a measurement result is influenced.
Disclosure of Invention
The invention aims to provide an elevator system adopting radar ranging, interference signals cannot be received by a receiving antenna of the radar, and the position and the speed of an elevator car in an elevator shaft can be accurately measured.
As the conception, the technical scheme adopted by the invention is as follows:
the utility model provides an adopt elevator system of radar range finding, includes elevator car and elevator well, its characterized in that still includes:
the radar comprises a transmitting antenna and a receiving antenna, wherein the transmitting antenna is used for transmitting electromagnetic waves, and the receiving antenna is used for receiving the electromagnetic waves;
a left-handed material reflector, one of the radar and the left-handed material reflector being attached to the top of the elevator car and the other being attached to the top of the elevator hoistway, the reflector comprising a base plate and an array structure fixedly attached to an end surface of the base plate facing the radar;
the electromagnetic wave transmitted by the transmitting antenna is a transmitting electromagnetic wave, the transmitting electromagnetic wave can be reflected by the left-handed material reflector to obtain a reflected electromagnetic wave perpendicular to the linear polarization direction of the transmitting electromagnetic wave, and the receiving antenna receives the electromagnetic wave perpendicular to the linear polarization direction of the transmitting electromagnetic wave.
Further, each row of the array structure comprises a plurality of spaced-apart I-shaped metal foils.
Furthermore, the left-handed material reflector is a plane reflector, the substrate is horizontally arranged, and an included angle between the linear polarization direction of the emitted electromagnetic waves and the transverse edge or the vertical edge of the I-shaped metal foil is a set angle.
Further, the set angle is 45 °.
Furthermore, the left-handed material reflector is a corner reflector, the substrate comprises a first reflecting surface, a second reflecting surface and a third reflecting surface, the first reflecting surface, the second reflecting surface and the third reflecting surface are all isosceles right triangles, the right-angle sides of the first reflecting surface, the second reflecting surface and the third reflecting surface are connected with each other to form the corner reflector, and the hypotenuses of the first reflecting surface, the second reflecting surface and the third reflecting surface are all located on the horizontal plane.
Further, the transverse edge and the vertical edge of the i-shaped metal foil on the first reflecting surface are respectively parallel to the two right-angle edges of the first reflecting surface, the transverse edge and the vertical edge of the i-shaped metal foil on the second reflecting surface are respectively parallel to the two right-angle edges of the second reflecting surface, and the transverse edge and the vertical edge of the i-shaped metal foil on the third reflecting surface are respectively parallel to the two right-angle edges of the third reflecting surface.
Furthermore, three right-angle sides formed by connecting the first reflecting surface, the second reflecting surface and the third reflecting surface form three projection lines on a horizontal plane, and one of the three projection lines is parallel to the linear polarization direction of the emitted electromagnetic wave.
Further, the I-shaped metal foil is a copper material.
Further, the substrate is a PCB.
Furthermore, a copper layer is laid on the end face of the substrate, which faces away from the radar.
The invention has the beneficial effects that:
the invention provides an elevator system adopting radar for distance measurement, which transmits electromagnetic waves through a transmitting antenna of the radar, reflects the electromagnetic waves by a left-handed material reflector, receives the electromagnetic waves by a receiving antenna, calculates and obtains the position and the speed of an elevator car in an elevator shaft, because the linear polarization direction of the electromagnetic wave is changed after the transmitted electromagnetic wave is reflected by the left-handed material reflector with the array structure, while the linear polarization direction of the electromagnetic wave which is not reflected by the left-handed material reflector is the same as the linear polarization direction of the transmitted electromagnetic wave, by setting the receiving antenna to only receive the electromagnetic wave vertical to the linear polarization direction of the transmitted electromagnetic wave, the receiving antenna can only receive the electromagnetic wave reflected by the left-handed material reflector, namely, the receiving antenna can not receive the interference signal, thereby ensuring the accuracy of measuring the position and the speed of the elevator car in the elevator shaft.
Drawings
Fig. 1 is a front view of an elevator system using radar ranging according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an elevator system using radar ranging according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a left-handed material reflector of an elevator system using radar ranging according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a left-handed material reflector of an elevator system using radar ranging according to a second embodiment of the present invention.
In the figure:
10. an elevator car; 20. an elevator hoistway;
1. a radar;
2. a left-handed material reflector; 21. a substrate; 211. a first reflective surface; 212. a second reflective surface; 213. a third reflective surface; 22. an array structure; 221. an I-shaped metal foil.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
Referring to fig. 1 to 3, an embodiment of the present invention provides an elevator system using radar ranging, including an elevator car 10 and an elevator hoistway 20, further including a radar 1 and a left-handed material reflector 2, where the radar 1 includes a transmitting antenna and a receiving antenna, the transmitting antenna is used for transmitting electromagnetic waves, and the receiving antenna is used for receiving electromagnetic waves; one of the radar 1 and the left-handed material reflector 2 is connected to the top of the elevator car 10, and the other is connected to the top of the elevator hoistway 20, the reflector 2 comprises a base plate 21 and an array structure 22, and the array structure 22 is fixedly connected to the end face, facing the radar 1, of the base plate 21; the electromagnetic wave transmitted by the transmitting antenna is the transmitted electromagnetic wave, the transmitted electromagnetic wave can be reflected by the left-handed material reflector 2 to obtain the reflected electromagnetic wave vertical to the linear polarization direction of the transmitted electromagnetic wave, and the receiving antenna receives the electromagnetic wave vertical to the linear polarization direction of the transmitted electromagnetic wave.
The electromagnetic wave is transmitted by a transmitting antenna of the radar 1, the left-handed material reflector 2 reflects the electromagnetic wave, and the receiving antenna receives the electromagnetic wave, so that the position and the speed of the elevator car 10 in the elevator hoistway 20 are calculated, the linear polarization direction of the electromagnetic wave after the transmitted electromagnetic wave is reflected by the left-handed material reflector 2 with the array structure 22 is changed, the linear polarization direction of the electromagnetic wave which is not reflected by the left-handed material reflector 2 is the same as the linear polarization direction of the transmitted electromagnetic wave, only the electromagnetic wave which is vertical to the linear polarization direction of the transmitted electromagnetic wave can be received by the receiving antenna, so that the receiving antenna can only receive the electromagnetic wave reflected by the left-handed material reflector 2, namely the receiving antenna can not receive interference signals, and the accuracy of measuring the position and the speed of the elevator car 10 in the elevator hoistway 20 is ensured.
In this embodiment the radar 1 is attached to the top of the elevator car 10 and the left-handed material reflector 2 is attached to the top of the elevator hoistway 20.
Referring to fig. 3, each row of array structures 22 includes a plurality of spaced apart i-shaped metal foils 221. The left-handed material reflector 2 with the i-shaped metal foil 221 is a conventional material. In the present embodiment, the i-shaped metal foil 221 is a copper material. The i-shaped metal foil 221 may be made of other metal materials with good conductivity, such as silver. The substrate 21 is a PCB board, which is convenient for material acquisition and low in cost. The substrate 21 may be a plate made of other non-conductive material. The end face of the substrate 21 facing away from the radar 1 is coated with a copper layer, which may be replaced by another metal coating with good conductivity. The change of the linear polarization direction of the electromagnetic wave can be realized by the i-shaped metal foil 221. In the present embodiment, each row of the i-shaped metal foils of the array structure 22 is parallel to each other, and each column of the i-shaped metal foils of the array structure 22 is parallel to each other.
The left-handed material reflector 2 is a planar reflector, the substrate 21 is horizontally disposed, and the linear polarization direction of the emitted electromagnetic waves and the transverse edge or the vertical edge of the i-shaped metal foil 221 form a set angle, so that the linear polarization direction of the emitted electromagnetic waves can be changed differently by different set angles.
In this embodiment, the transmission direction of the transmitted electromagnetic wave is the Z direction, the linear polarization direction of the transmitted electromagnetic wave is the X direction, the receiving antenna can only receive the electromagnetic wave whose linear polarization direction is the Y direction, when the linear polarization direction of the reflected electromagnetic wave obtained after the transmitted electromagnetic wave is reflected by the left-handed material reflector 2 is changed, the component part whose linear polarization direction is the Y direction of the reflected electromagnetic wave can be received by the receiving antenna, and the linear polarization direction of the electromagnetic wave that has not been reflected by the left-handed material reflector 2 is also the X direction, and cannot be received by the receiving antenna.
The set angle is 45 °, in this embodiment, an included angle between a vertical edge in the middle of the i-shaped metal foil 221 and the X direction is 45 °, an included angle between two horizontal edges at the upper and lower ends of the i-shaped metal foil 221 and the X direction is 135 °, when the set angle is 45 °, a linear polarization direction of an electromagnetic wave obtained after the transmitted electromagnetic wave with the linear polarization direction being the X direction is reflected by the left-handed material reflector 2 is Y, that is, the reflected electromagnetic wave can be received by the receiving antenna, a polarization loss factor of the reflected electromagnetic wave is 1, that is, there is no polarization loss, and a linear polarization direction of other electromagnetic waves that are not reflected by the left-handed material reflector 2 is X, and a polarization loss factor of the other electromagnetic waves is 0, that is, the receiving antenna cannot receive related signals at all.
Example two
Fig. 4 shows a second embodiment, wherein the same or corresponding parts as in the first embodiment are provided with the same reference numerals as in the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described. The difference is that the left-handed material reflector 2 is a corner reflector, the substrate 21 includes a first reflecting surface 211, a second reflecting surface 212 and a third reflecting surface 213, the first reflecting surface 211, the second reflecting surface 212 and the third reflecting surface 213 are all isosceles right triangles, the right-angled sides of the first reflecting surface 211, the second reflecting surface 212 and the third reflecting surface 213 are connected to form the corner reflector, and the hypotenuses of the first reflecting surface 211, the second reflecting surface 212 and the third reflecting surface 213 are all located on the horizontal plane. In this embodiment, the transmission direction of the transmitted electromagnetic wave is the Z direction, the linear polarization direction of the transmitted electromagnetic wave is the X direction, and the receiving antenna can only receive the electromagnetic wave with the linear polarization direction being the Y direction. Because the base plate 21 is a horizontal plane reflector, when the base plate is installed, installation errors are easy to occur, so that the plane reflector is not horizontally arranged, the reflection direction of the electromagnetic waves reflected by the non-horizontal plane reflector deflects, namely the emission direction of the electromagnetic waves is the Z direction but the reflection direction deviates from the Z direction by a certain angle, so that the electromagnetic waves cannot be completely received by the receiving antenna, and the effect of measuring the distance between the top end of the elevator car 10 and the top end of the elevator hoistway 20 is influenced. The reflection direction of the electromagnetic wave can be also the Z direction through the corner reflector, and the electromagnetic wave can be received by the receiving antenna.
The transverse edge and the vertical edge of the I-shaped metal foil 221 on the first reflecting surface 211 are respectively parallel to the two right-angle edges of the first reflecting surface 211, the transverse edge and the vertical edge of the I-shaped metal foil 221 on the second reflecting surface 212 are respectively parallel to the two right-angle edges of the second reflecting surface 212, the transverse edge and the vertical edge of the I-shaped metal foil 221 on the third reflecting surface 213 are respectively parallel to the two right-angle edges of the third reflecting surface 213, electromagnetic waves emitted by the emitting antenna can be emitted on the first reflecting surface 211, the second reflecting surface 212 and the third reflecting surface 213 at first, and are received by the receiving antenna after three reflections, and the linear polarization direction of the electromagnetic waves can be changed after each reflection.
Three right-angle sides formed by connecting the first reflecting surface 211, the second reflecting surface 212 and the third reflecting surface 213 form three projection lines on a horizontal plane, one of the three projection lines is parallel to the linear polarization direction of the transmitted electromagnetic wave, so that the included angle between the projection of the I-shaped metal foil 221 on the horizontal plane and the linear polarization direction of the transmitted electromagnetic wave on one of the first reflecting surface 211, the second reflecting surface 212 and the third reflecting surface 213 is 45 degrees, the receiving antenna can receive most of the electromagnetic waves, and the measuring accuracy is ensured.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An elevator system employing radar ranging, comprising an elevator car (10) and an elevator hoistway (20), characterized by further comprising:
a radar (1) comprising a transmitting antenna for transmitting electromagnetic waves and a receiving antenna for receiving electromagnetic waves;
a left-handed material reflector (2), one of the radar (1) and the left-handed material reflector (2) being connected to the top of the elevator car (10) and the other being connected to the top of the elevator hoistway (20), the reflector (2) comprising a base plate (21) and an array structure (22), the array structure (22) being fixedly connected to an end face of the base plate (21) facing the radar (1);
the electromagnetic waves transmitted by the transmitting antenna are transmitted electromagnetic waves, the transmitted electromagnetic waves can be reflected by the left-handed material reflector (2) to obtain reflected electromagnetic waves vertical to the linear polarization direction of the transmitted electromagnetic waves, and the receiving antenna receives the electromagnetic waves vertical to the linear polarization direction of the transmitted electromagnetic waves.
2. Elevator system according to claim 1, characterized in that each row of the array structure (22) comprises a plurality of spaced-apart I-shaped metal foils (221).
3. The elevator system using radar ranging according to claim 2, wherein the left-handed material reflector (2) is a planar reflector, the base plate (21) is horizontally disposed, and the angle between the linear polarization direction of the emitted electromagnetic wave and the transverse edge or the vertical edge of the i-shaped metal foil (221) is a set angle.
4. The radar-ranging elevator system according to claim 3, wherein the set angle is 45 °.
5. The elevator system using radar ranging according to claim 2, wherein the left-handed material reflector (2) is a corner reflector, the base plate (21) comprises a first reflecting surface (211), a second reflecting surface (212) and a third reflecting surface (213), the first reflecting surface (211), the second reflecting surface (212) and the third reflecting surface (213) are all isosceles right triangles, the right-angled sides of the first reflecting surface (211), the second reflecting surface (212) and the third reflecting surface (213) are connected with each other to form the corner reflector, and the oblique sides of the first reflecting surface (211), the second reflecting surface (212) and the third reflecting surface (213) are all located on a horizontal plane.
6. The elevator system using radar ranging according to claim 5, wherein the transverse edge and the vertical edge of the I-shaped metal foil (221) on the first reflecting surface (211) are respectively parallel to the two right-angle edges of the first reflecting surface (211), the transverse edge and the vertical edge of the I-shaped metal foil (221) on the second reflecting surface (212) are respectively parallel to the two right-angle edges of the second reflecting surface (212), and the transverse edge and the vertical edge of the I-shaped metal foil (221) on the third reflecting surface (213) are respectively parallel to the two right-angle edges of the third reflecting surface (213).
7. The elevator system using radar ranging according to claim 6, wherein three right-angled sides formed by connecting the first reflecting surface (211), the second reflecting surface (212) and the third reflecting surface (213) form three projection lines on a horizontal plane, and one of the three projection lines is parallel to the linear polarization direction of the transmitted electromagnetic wave.
8. Elevator system according to claim 2, characterized in that the I-shaped metal foil (221) is a copper material.
9. Elevator system according to claim 1, characterized in that the base plate (21) is a PCB board.
10. Elevator system according to claim 1, characterized in that the end of the base plate (21) facing away from the radar (1) is coated with a copper layer.
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| CN202210349959.0A CN114735558B (en) | 2022-04-02 | 2022-04-02 | Elevator system adopting radar ranging |
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| CN202210349959.0A CN114735558B (en) | 2022-04-02 | 2022-04-02 | Elevator system adopting radar ranging |
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| CN114735558B CN114735558B (en) | 2023-08-11 |
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| CN104483672A (en) * | 2015-01-05 | 2015-04-01 | 山东省地质环境监测总站 | INSAR corner reflector |
| CN104701611A (en) * | 2015-02-09 | 2015-06-10 | 宁波成电泰克电子信息技术发展有限公司 | Antenna for marine radar |
| US20160365625A1 (en) * | 2015-06-09 | 2016-12-15 | Robert Bosch Gmbh | Antenna device for receiving electromagnetic waves and method for operating an antenna device for receiving electromagnetic waves |
| CN105403868A (en) * | 2015-11-21 | 2016-03-16 | 葛强林 | Cellular radar angle reflector |
| CN107611610A (en) * | 2017-09-11 | 2018-01-19 | 成都德杉科技有限公司 | A kind of array antenna for extensive MIMO |
| JP2019158543A (en) * | 2018-03-13 | 2019-09-19 | 古河電気工業株式会社 | Radar system |
| CN108427103A (en) * | 2018-04-20 | 2018-08-21 | 中铁第四勘察设计院集团有限公司 | A kind of corner reflector for the calibration of ground-based radar echo-signal |
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| CN111824878A (en) * | 2020-07-09 | 2020-10-27 | 日立楼宇技术（广州）有限公司 | Elevator position detection method, elevator position detection system and elevator |
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