CN110858451A - Positioning system with short-distance vehicle finding function and handheld finder - Google Patents
Positioning system with short-distance vehicle finding function and handheld finder Download PDFInfo
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- CN110858451A CN110858451A CN201810968271.4A CN201810968271A CN110858451A CN 110858451 A CN110858451 A CN 110858451A CN 201810968271 A CN201810968271 A CN 201810968271A CN 110858451 A CN110858451 A CN 110858451A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/14—Traffic control systems for road vehicles indicating individual free spaces in parking areas
- G08G1/141—Traffic control systems for road vehicles indicating individual free spaces in parking areas with means giving the indication of available parking spaces
- G08G1/144—Traffic control systems for road vehicles indicating individual free spaces in parking areas with means giving the indication of available parking spaces on portable or mobile units, e.g. personal digital assistant [PDA]
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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
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
- G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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Abstract
A positioning system and a handheld finder with short-distance vehicle finding function are provided, wherein the positioning system comprises: the device to be collected and the handheld finder; the collected equipment is connected with the handheld finder within a certain range through short-distance wireless communication to send the ID and signal strength information of the collected equipment; and the handheld finder receives the ID of the collected equipment and the signal strength information and then processes the ID of the collected equipment and the signal strength information to display information comprising the ID of the collected equipment, the signal strength information and the distance of the collected equipment. The invention can overcome the defects that the vehicle-mounted terminal in the prior positioning technology is easy to shield, interfere and be detected, and realizes the accurate positioning of the acquired equipment and the display of the ID, the signal intensity, the distance, the direction and the like between the acquired equipment and the handheld finder.
Description
Technical Field
The invention relates to the technical field of short-distance wireless communication, in particular to a positioning system with a short-distance car finding function and a handheld finder.
Background
The vehicle positioning technology is one of the cores of automobile financial wind control, in recent years, the domestic car consumption market is exploded, the production and sales volume of more than 3000 tens of thousands of cars is produced every year, and the production and sales volume is increased year by year, wherein about 50 percent of consumers buy cars by depending on various automobile financial services, including new car loan, financing lease, second-hand car loan and the like, and a financial company controls financial risks and meets the requirements of about 3000 thousands of intelligent vehicle-mounted terminals every year. However, the vehicle-mounted terminal positioning technologies adopted at home and abroad are generally GPS/Beidou, LBS and WIFI positioning, and the positioning technologies generally have known principles, standard frequency bands and fixed coding and modulation technologies, so that the vehicle-mounted terminal positioning technologies are easily shielded, interfered, detected and removed, and the positioning function is lost. Particularly, in the automobile financing lease industry, when an illegal vehicle occurs, the illegal party generally hides the vehicle, such as a completely closed rolling door garage, a high-wall forest farmhouse and the like, and when the situation occurs, the vehicle cannot be accurately positioned by means of positioning modes (positioning vehicle-mounted terminals) such as traditional GPS/Beidou, LBS, WIFI and the like, so that the automobile cannot be found in which garage or which farmhouse, the financing lease company cannot find the vehicle, and the illegal party cannot be restrained, and the risk that assets and funds cannot be withdrawn is caused.
Disclosure of Invention
The invention mainly aims to provide a positioning system with a short-distance vehicle finding function and a handheld finder, which can overcome the defects that a vehicle-mounted terminal in the prior positioning technology is easy to shield, interfere and be detected, and realize accurate positioning of a collected device and display of an ID (identity), signal strength, distance, direction and the like of the collected device and the handheld finder.
The invention adopts the following technical scheme:
in one aspect, the present invention provides a positioning system with a short-distance vehicle finding function, including: the device to be collected and the handheld finder; the collected equipment is connected with the handheld finder within a certain range through short-distance wireless communication to send the ID and signal strength information of the collected equipment; and the handheld finder receives the ID of the collected equipment and the signal strength information and then processes the ID of the collected equipment and the signal strength information to display information comprising the ID of the collected equipment, the signal strength information and the distance of the collected equipment.
Preferably, the collected device and the handheld finder adopt the same frequency point, coding and modulation mode.
Preferably, the handheld finder comprises: a receiving board and a mobile phone; the receiving board is connected with the collected equipment within a certain range through short-distance wireless communication to receive the ID and signal intensity information of the collected equipment sent by the collected equipment; the mobile phone is connected with the receiving board to receive the ID and the signal intensity information of the collected equipment, and the distance between the handheld finder and the collected equipment is calculated according to the signal intensity information.
Preferably, the distance between the handheld finder and the acquired device is calculated according to the signal strength information in the following manner:
d＝BΛ(((250-RSSI)/A)-1)
wherein d represents the calculated distance in meters; b represents an environmental index factor; RSSI represents received signal strength; and A represents the difference value of the signal intensity when the acquired equipment and the handheld finder are separated by 1 meter and the preset signal intensity.
Preferably, the receiving board comprises an MCU module, a panel antenna, a short-distance wireless communication module, a USB module and a power supply module; the panel antenna is connected with the short-distance wireless communication module to receive the ID and signal strength information of the collected equipment in the specified direction; the MCU module is connected with the short-distance wireless communication module to receive the ID and the signal intensity information of the acquired equipment; the USB module is respectively connected with the MCU module and the mobile phone to establish a data channel between the MCU module and the mobile phone; the power supply module is respectively connected with the MCU module, the short-distance wireless communication module and the USB module to supply power.
Preferably, the mobile phone is fixed at the top of the panel at the back of the panel antenna and forms a preset included angle with the panel antenna.
Preferably, the mobile phone is connected to the receiving board to receive the ID and the signal strength information of the collected device, and calculates the distance between the handheld finder and the collected device according to the signal strength information, and specifically includes:
the mobile phone is connected with the receiving board to receive the ID and the signal intensity information of the collected equipment in the appointed direction, the distance between the handheld finder and the collected equipment is calculated according to the signal intensity information, and the direction of the collected equipment is judged according to the signal intensity information.
Preferably, the mobile phone is connected to the receiving board to receive the ID and the signal strength information of the device to be collected in the designated direction, and determines the direction of the device to be collected according to the signal strength information, including:
enabling the panel antenna to face the right front, recording the current direction and recording the received first signal strength;
rotating the panel antenna by a preset angle, keeping the panel antenna facing the right front, recording the current direction and recording the received second signal strength;
continuing to rotate the panel antenna by a preset angle, keeping the panel antenna facing the right front, recording the current direction and recording the received third signal strength;
continuing to rotate the panel antenna by a preset angle, keeping the panel antenna facing the right front, recording the current direction and recording the received fourth signal strength;
comparing the first signal strength, the second signal strength, the third signal strength, and the fourth signal strength; and taking the direction in which the maximum signal intensity value is acquired as the direction in which the acquired equipment is located.
Preferably, the rotation direction of the panel antenna is maintained in a clockwise direction or a counterclockwise direction.
In another aspect, the invention relates to a handheld finder with a short-distance car finding function, which comprises a positioning system with a short-distance car finding function.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention relates to a handheld finder with a short-distance car finding function, which can receive a short-distance wireless signal sent by a device to be acquired (a vehicle-mounted terminal or a position transmitter, the vehicle-mounted terminal or the position transmitter has a short-distance wireless transmitting function and can send a vehicle-mounted terminal ID/a position transmitter ID and signal intensity to the handheld finder), calculate the distance between the handheld finder and the device to be acquired according to the signal intensity, judge the position of the device to be acquired by adjusting the direction of a panel antenna of the handheld finder, and enable a user to gradually approach the handheld finder to a vehicle, a person or other objects provided with the device to be acquired so as to finally find a target;
(2) the invention relates to a handheld finder with a short-distance car finding function, wherein a mobile phone can display the ID of a device to be acquired, the signal intensity, the distance of the device to be acquired and carry out direction indication on a screen, so that a user can approach a car gradually through the change of the signal intensity and the distance;
(3) according to the handheld finder with the short-distance car finding function, the collected equipment is found through the short-distance wireless signals, the positioning precision can reach 1m, and the specific position of the specified collected equipment can be conveniently located. Therefore, the handheld finder solves the problem of vehicle finding pain in the automobile financing leasing industry, greatly meets the requirements of wind control departments of related companies, and can bring considerable social and economic benefits.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the description of the technical means more comprehensible.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a block diagram of a positioning system with a short-distance vehicle finding function according to an embodiment of the present invention;
FIG. 2 is a block diagram of a handheld finder according to an embodiment of the present invention;
FIG. 3 is a flow chart of a handheld finder operation according to an embodiment of the present invention;
FIG. 4 is a first perspective view of a handheld finder according to an embodiment of the present invention;
FIG. 5 is a second perspective view of the handheld finder according to the embodiment of the present invention;
fig. 6 is a flowchart of the direction search according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, in one aspect, the present invention provides a positioning system with a short-distance vehicle finding function, including: the collected device 20 and the handheld finder 10; the collected device 20 is connected with the handheld finder 10 within a certain range through short-distance wireless communication to send the ID and signal strength information of the collected device; the handheld finder 10 receives the ID of the device to be collected and the signal strength information, and then processes the received ID and signal strength information to display information including the ID of the device to be collected, the signal strength information, and the distance to the device to be collected. The acquired device ID is used to uniquely identify an acquired device 20, and the acquired device distance includes the distance between the acquired device 20 and the handheld finder 10.
Specifically, the acquired device 20 includes a position transmitter and/or a vehicle-mounted terminal; the acquisition device includes a handheld finder 10. The collected device 20 and the handheld finder 10 adopt the same frequency point, coding and modulation mode.
It should be noted that the wireless signal sent by the collected device 20 to the handheld finder 10 may also be agreed according to needs, for example, the wireless signal may also include battery power information of the collected device 20, and the handheld finder 10 displays the battery power information on an interface to determine a search strategy. In addition, the handheld finder 10 can also display information as needed, such as displaying the received bearing on a compass screen, displaying abnormal information, etc.
Referring to fig. 2, the handheld finder 10 includes: a receiving board 101 and a mobile phone 102; the receiving board 101 is connected with the devices 20 to be collected within a certain range through short-distance wireless communication to receive the device IDs and signal strength information sent by the devices 20 to be collected; the mobile phone 102 is connected with the receiving board 101 to receive the ID and the signal strength information of the device to be collected, and calculates the distance between the handheld finder 10 and the device to be collected 20 according to the signal strength information.
The receiving board 101 includes an MCU module 1011, a panel antenna 1012, a short-range wireless communication module 1013, a USB module 1014, and a power supply module 1015; the MCU module 1011 is connected to the short-range wireless communication module 1013 and the USB module 1014, respectively; the short-range wireless communication module 1013 is connected to the panel antenna 1012; the power supply module 1015 is connected to the MCU module 1011, the short-range wireless communication module 1013, and the USB module 1014, respectively, to supply power.
The MCU module 1011 mainly realizes three functions: 1) receiving the ID, signal strength information and battery power information of the acquired device acquired by the short-distance wireless communication module 1013; 2) establishing a data interaction pipeline between the USB module 1014 and the mobile phone 102, and forwarding the information received from the short-range wireless communication module 1013 to the mobile phone 102; 3) as a main control module of the whole handheld finder 10, summarizing, analyzing and processing data information of other modules;
the short-range wireless communication module 1013 is configured to receive the short-range radio frequency signal sent by the acquired device 20, and analyze the acquired device ID, the signal strength, and the battery power information in the signal. Wherein the short-range communication employs 433M spread spectrum communication, the over-the-air data format of the data signal transmitted by the acquisition device 20 is shown in table 1 below.
The USB module 1014, as a bridging device between the MCU module 1011 and the mobile phone 102, establishes a data channel for communication between the two;
the flat antenna 1012 has high signal gain and receiving sensitivity; on the other hand, the direction of the signal source is sensitive, so that the directional effect can be achieved, and the direction of the collected equipment 20 can be conveniently searched;
the power module 1015 provides proper working voltage and current for other modules except the mobile phone 102, so as to ensure that each module can be powered on normally.
TABLE 1
The handset 102 mainly implements three parts of functions: 1) the received ID, signal intensity and battery power information of the collected equipment are displayed on a screen interface through the APP, so that a user can conveniently judge the change of the signal intensity and the distance so as to gradually approach to a vehicle; 2) the related information received by the receiving board 101 is acquired through the USB module 1014, whether the receiving board 101 works normally is judged, and the receiving board 101 can work normally all the time; 3) the entire receiving board 101 is supplied with power through the USB module 1014.
As shown in table 2, the heartbeat request protocol between the handset 102 and the receiving board 101 is as follows.
TABLE 2
| Start byte | Field(s) | Data ofType (B) | Description of the |
| 0 | Message ID | BYTE | Is 0x 30; |
| 1 | version number | BYTE | Is a value between 0 and 255; |
the heartbeat frame is initiated by the receiving board 101 and is sent every 3 seconds, if the mobile phone 102 does not receive the heartbeat frame for 10 seconds continuously, the receiving board 101 is judged to be abnormal in operation, and prompt is performed on an interface.
Referring to table 3, the data protocol between the handset 102 and the receiving board 101 is as follows.
TABLE 3
When the receiving board 101 receives the wireless signal of the device 20 to be acquired, the data is analyzed and sent to the mobile phone 102 according to the protocol in table 3 above.
Referring to fig. 3, the workflow of the handheld finder 10 includes:
step 301, a user inputs an ID of an acquired device 20 to be searched through a mobile phone APP;
step 302, the mobile phone 102 and the receiving board 101 establish data connection through the USB module 1014 and send an ID to be searched to the MCU module 1011;
step 303, the short-distance wireless communication module 1013 sends the received ID, signal strength, battery power information, etc. of the acquired device to the MCU module 1011;
step 304, the MCU module 1011 compares whether the received ID of the collected device is the same as the ID to be searched, if not, returns to step 303, otherwise, executes step 305;
step 305, the MCU module 1011 sends the ID, signal strength, battery power information, etc. of the collected device to the mobile phone APP;
step 306, calculating the distance between the handheld finder 10 and the acquired device 20 according to the signal intensity information by the mobile phone APP and displaying an interface;
step 307, the user visually determines the distance between the device 20 and the device 20 through the graphical interface of the mobile phone 102, and gradually approaches the device 20.
Specifically, the distance between the handheld finder 10 and the acquired device 20 is calculated according to the signal strength information in the following manner:
d＝BΛ(((250-RSSI)/A)-1)
wherein d represents the calculated distance in meters; b represents an environmental index factor;Λrepresents an index; RSSI represents received signal strength; a represents the difference between the signal strength at 1 meter separation between the acquired device 20 and the handheld finder 10 and the preset signal strength.
Specifically, the environmental index factor refers to loss existing when the radio frequency signal propagates in various media (such as air), and in this embodiment, B is 4; the RSSI range is 0-250, and the larger the value is, the stronger the strength is and the closer the distance is; the preset signal strength is 250 (e.g., a is 30 if the signal strength is 220 at a distance of 1 m).
Referring to fig. 4 and 5, the handheld finder 10 further includes a handle 103 and a handset support 104; the panel antenna 1012 includes a detachable front and rear portion (front panel 10121 and back panel 10122); the mobile phone 102 and the receiving board 101 are connected through a USB connecting line 105; the MCU module 1011, the short-range wireless communication module 1013, the USB module 1014, and the power module 1015 may be disposed in a cavity formed by the back panel 10122 and the front panel 10121 of the flat antenna 1012, and of course, other mounting manners may be provided, which is not limited in the embodiments of the present invention.
Specifically, the mobile phone 102 is fixed to the top of the panel 10122 on the back of the panel antenna 1012 and forms a preset included angle with the panel antenna 1012, and the preset included angle is 45 degrees. The handle 103 is directly screwed into the bottom of the panel antenna 1012; the mobile phone support 104 is adhered to the top position of the back of the panel antenna 1012 by using double-sided adhesive; magic tapes are respectively stuck on the back surface of the mobile phone 102 and the mobile phone support 104 and used for fixing the mobile phone 102 on the mobile phone support 104.
In this embodiment, the mobile phone 102 is connected to the receiving board 101 to receive the ID and the signal strength information of the collected device, and calculates the distance between the handheld finder 10 and the collected device 20 according to the signal strength information, which specifically includes:
the mobile phone 102 is connected with the receiving board 101 to receive the ID and signal strength information of the device to be collected in the designated direction, calculate the distance between the handheld finder 10 and the device to be collected 20 according to the signal strength information, and determine the direction of the device to be collected 20 according to the signal strength information.
The direction search function of the handheld finder 10 needs to be implemented by means of the earth magnetic field induction of the handset 102 and the directional reception function of the patch antenna 1012. Since the main body of the flat antenna 1012 is a large steel plate, the magnetic field around it is affected. To minimize this effect, the handset 102 places its top portion over the patch antenna 1012, with the body and antenna patch at a 45 degree angle for best directional search.
When the direction search is performed, the flat antenna 1012 is perpendicular to the ground, the screen of the mobile phone 102 forms a 45-degree included angle with the ground, when a signal is acquired in a certain direction, the signal strength value at the moment corresponds to the direction of the mobile phone 102 and is recorded (when the mobile phone 102 is roughly laid flat, the direction of the mobile phone 102 is sensed by the compass of the mobile phone 102 when the mobile phone 102 rotates in one direction), and in order to express the direction of the mobile phone 102, the receiving direction is displayed on the compass screen of the mobile phone 102; thus, when the receiver is stationary, the panel antenna 1012 is rotated to receive different signal strength values and obtain the corresponding direction. And finally, taking the corresponding direction with the maximum signal intensity as the position of the acquired device 20.
In practical processing, because of the complexity of the environment, an infinite number of possible directions are reduced to 4 directions, namely, 4 directions around the acquisition device, and when the receiving is started, the first direction must be confirmed first, and the included angle between the other three directions and the first direction must be a multiple of 90 degrees, and the allowable error range is ± 10 degrees.
Specifically, as shown in fig. 6, the mobile phone 102 is connected to the receiving board 101 to receive the ID and the signal strength information of the device to be collected in the designated direction, and determines the direction of the device to be collected 20 according to the signal strength information, which specifically includes:
In practical use, the rotation can be realized by a right rotation in addition to a left rotation, but the same direction needs to be maintained during the continuous rotation.
In another aspect, the handheld finder with short-distance car finding function of the present invention includes a handheld finder 10 of a positioning system with short-distance car finding function.
Specifically, when the collected device is a vehicle-mounted terminal, the positioning system and the handheld finder with the short-distance car finding function are mainly applied to the following conditions:
(1) when GSM and GPS signals of the vehicle-mounted terminal are all shielded and cannot upload any data to a background service center (the background service center can be connected with a data network to perform data processing and data display), the vehicle-mounted terminal actively starts a short-distance transmitting function, a vehicle finder can use a handheld finder to search the position of a vehicle in a place where the vehicle with the vehicle-mounted terminal often appears or disappears, and the handheld finder can receive signals from the vehicle-mounted terminal within the range of 1000 meters by taking the handheld finder as the center of a circle in the moving process so as to judge the position of the shielded vehicle;
(2) when the GSM signal of the vehicle-mounted terminal is good but the GPS signal is shielded, a vehicle finder can find the approximate position of the vehicle according to the positioning information of the GSM base station, then the vehicle finder receives the short-distance wireless signal transmitted by the vehicle-mounted equipment, approaches the vehicle step by step and finally finds the position of the vehicle;
(3) when the GSM signal of the vehicle-mounted terminal is good and the GPS signal is good, but the positioning error of the GPS and the vehicle are hidden and invisible, the short-distance transmitting function of the vehicle-mounted terminal is actively started through the background service center, at the moment, a vehicle seeker can reach the approximate position of the vehicle firstly, then the vehicle seeker receives the short-distance wireless signal by using the handheld finder, approaches the vehicle gradually, and finally finds the position of the vehicle.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. A positioning system with a short-distance vehicle finding function is characterized by comprising: the device to be collected and the handheld finder; the collected equipment is connected with the handheld finder within a certain range through short-distance wireless communication to send the ID and signal strength information of the collected equipment; and the handheld finder receives the ID of the collected equipment and the signal strength information and then processes the ID of the collected equipment and the signal strength information to display information comprising the ID of the collected equipment, the signal strength information and the distance of the collected equipment.
2. The positioning system with the function of finding vehicles in a short distance according to claim 1, wherein the collected device and the handheld finder adopt the same frequency point, coding and modulation mode.
3. The positioning system with short-distance car finding function as claimed in claim 1, wherein the handheld finder comprises: a receiving board and a mobile phone; the receiving board is connected with the collected equipment within a certain range through short-distance wireless communication to receive the ID and signal intensity information of the collected equipment sent by the collected equipment; the mobile phone is connected with the receiving board to receive the ID and the signal intensity information of the collected equipment, and the distance between the handheld finder and the collected equipment is calculated according to the signal intensity information.
4. The positioning system with short-distance vehicle finding function according to claim 3, wherein the distance between the handheld finder and the collected device is calculated according to the signal strength information by the following method:
d＝BΛ(((250-RSSI)/A)-1)
wherein d represents the calculated distance in meters; b represents an environmental index factor; RSSI represents received signal strength; and A represents the difference value of the signal intensity when the acquired equipment and the handheld finder are separated by 1 meter and the preset signal intensity.
5. The positioning system with the function of finding vehicles in a short distance according to claim 3, wherein the receiving board comprises an MCU module, a panel antenna, a short-distance wireless communication module, a USB module and a power supply module; the panel antenna is connected with the short-distance wireless communication module to receive the ID and signal strength information of the collected equipment in the specified direction; the MCU module is connected with the short-distance wireless communication module to receive the ID and the signal intensity information of the acquired equipment; the USB module is respectively connected with the MCU module and the mobile phone to establish a data channel between the MCU module and the mobile phone; the power supply module is respectively connected with the MCU module, the short-distance wireless communication module and the USB module to supply power.
6. The positioning system with the function of finding vehicles in a short distance according to claim 5, wherein the mobile phone is fixed at the top of the panel at the back of the panel antenna and forms a preset included angle with the panel antenna.
7. The positioning system with the function of finding vehicles in close range according to claim 5, wherein the mobile phone is connected to the receiving board to receive the ID and the signal strength information of the device to be collected, and calculates the distance between the handheld finder and the device to be collected according to the signal strength information, specifically comprising:
the mobile phone is connected with the receiving board to receive the ID and the signal intensity information of the collected equipment in the appointed direction, the distance between the handheld finder and the collected equipment is calculated according to the signal intensity information, and the direction of the collected equipment is judged according to the signal intensity information.
8. The positioning system with the function of finding vehicles in close range according to claim 7, wherein the mobile phone is connected to the receiving board to receive the ID and the signal strength information of the device to be collected in a designated direction, and determines the direction of the device to be collected according to the signal strength information, specifically comprising:
enabling the panel antenna to face the right front, recording the current direction and recording the received first signal strength;
rotating the panel antenna by a preset angle, keeping the panel antenna facing the right front, recording the current direction and recording the received second signal strength;
continuing to rotate the panel antenna by a preset angle, keeping the panel antenna facing the right front, recording the current direction and recording the received third signal strength;
continuing to rotate the panel antenna by a preset angle, keeping the panel antenna facing the right front, recording the current direction and recording the received fourth signal strength;
comparing the first signal strength, the second signal strength, the third signal strength, and the fourth signal strength; and taking the direction in which the maximum signal intensity value is acquired as the direction in which the acquired equipment is located.
9. The positioning system with short-distance car finding function according to claim 8, wherein the rotation direction of the panel antenna is kept clockwise or counterclockwise.
10. A hand-held finder with short-distance car finding function, characterized in that the hand-held finder as claimed in any one of claims 3 to 9 is included.
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| CN201810968271.4A CN110858451A (en) | 2018-08-23 | 2018-08-23 | Positioning system with short-distance vehicle finding function and handheld finder |
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| CN201810968271.4A CN110858451A (en) | 2018-08-23 | 2018-08-23 | Positioning system with short-distance vehicle finding function and handheld finder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114202957A (en) * | 2020-08-31 | 2022-03-18 | 鸿富锦精密电子(天津)有限公司 | Parking management method, management device, and storage medium |
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