KR20190026098A - A method and apparatus for measuring the distance between a smartphone and a vehicle using Bluetooth multi-pairing - Google Patents

Abstract

Disclosed are a real-time location tracking method using triangulation which receives a reference signal transmitted from a smartphone from at least three antennas and then transceives an RSSI MAP and a response signal to an LF radio wave, and an apparatus thereof. According to the present invention, the location tracking method utilizes a multi-pairing method based on Bluetooth communication, which is not beacon-based by using one CPU to turn on/off three Bluetooth antenna units by using each switch and dramatically lowers the price, to precisely grasp a location of a smartphone by using an RSSI value.

Description

Method and apparatus for distance measurement between a smartphone and a vehicle using Bluetooth multi-pairing

The present invention relates to a method for measuring the distance between a vehicle and a smartphone. And more particularly to measuring the distance between a vehicle and a smartphone using triangulation.

In order for a car to move, it has to be "started" first. The vehicle's starting system starts with the world's first gasoline car made in Germany by Karl Benz in 1886. If you turn the large flywheel, which is placed horizontally in the back of the vehicle, clockwise, the metal strips that are connected to the flywheel collide with each other, I got up and started. Since then, when Byron Carter, a close friend of Cadillac Sarrand, has been running and the crank handle has been bouncing and his head has been hitting him, the company that supplied electric ignition to Cadillac Charles Kettering, president of Indelco, invented the self-starter, an electric self-starting device that starts up when the button is pressed. This is a way of connecting the battery's direct current motor to the crankshaft flywheel gear and starting it. In 1949, Chrysler of the United States developed a turn-key starter that started by connecting the electrical system of the starter to the car key lock switch. And the same key can be used to select the intermediate stage to connect the battery only without operating the engine and to use the accessories such as the interior lamp or the radio.

In recent years, with the development of wireless communication technology, there has been developed a smart key system of a vehicle having the above-described turn-key starter-type vehicle theft prevention and middle stage selection, That is, the smart key system senses a signal of a key possessed by a driver aboard the vehicle and causes the driver to operate the engine by pressing the start button. Accordingly, since the smart key possessed by the driver and the button start device of the vehicle communicate with each other wirelessly, the prevention of theft of the vehicle and the convenience of the driver are greatly improved. The smart key system of such a vehicle opens and closes the door of the vehicle from the outside without pushing a separate key insertion or operation button by the driver, and further detects whether the smart key is indoors. The start can be made only by the operation such as pressing the start button.

The smart key system of a vehicle is an application of a real-time location system (RTLS), and is mainly used in close range such as indoor or limited space. Such location tracking systems can be used not only in automobiles but also in a variety of industrial facilities such as parking lots, healthcare centers, production lines and warehouses, as well as security applications such as location-based access control.

The location estimation method in the RTLS system is based on the triangulation method of estimating the position of the object using the triangulation method as in the GPS and the LBS (Location-Based Service), the scene analysis using the image of the object, There is a proximity known as a Presence function.

Among them, triangulation is the most common location estimation method, and triangulation is based on Received Signal Strength Indication (RSSI) or Time of Arrival (ToA). In recent years, Beacon has been attracting attention as a short-range wireless communication device for smartphones using Bluetooth low energy (BLE) technology.

On the other hand, an operation function of a car electronic key disclosed in Korean Patent Publication No. 2005-0026192 (Mar. 15, 2005), which is an electronic key of a wristwatch type car, The antenna of the door handle detects the electronic key to open the door, and when the driver with the electronic key enters the room, the four indoor antennas detect the electronic key and control the start of the electronic key.

However, these electronic keys mainly focus on door opening and closing operations in the inside and outside of the vehicle, and they can be carried. However, since there is no transmitting / receiving function of attaching or wearing data to the body of the driver, There is still a problem that can not be ruled out. Also, the above patent discloses only a general description of a wristwatch-type automobile electronic key, but does not disclose a specific communication algorithm.

Korea Patent Publication No. 2005-0026192 (March 15, 2005)

The technical problem of the present invention is to measure distance by transmitting and receiving signals between a vehicle and a smartphone using triangulation instead of a beacon.

According to the present invention, by utilizing a multi-pairing method based on Bluetooth communication, which is not a beacon-based and dramatically low price by turning on / off three Bluetooth antenna units by using one CPU using one CPU, Phone location can be grasped.

Figure 1 illustrates a method for locating a smartphone utilizing multi-pairing of Bluetooth communication according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Also, in order to clearly illustrate the present invention in the drawings, portions not related to the present invention are omitted, and the same or similar reference numerals denote the same or similar components.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the objects and effects of the present invention are not limited only by the following description.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 illustrates a method for locating a smartphone utilizing multi-pairing of Bluetooth communication according to the present invention.

Referring to FIG. 1, the smartphone 100 includes three or more Bluetooth antenna units 110, a CPU or MCU 120 having a Bluetooth communication function, a switch 130 for connecting the Bluetooth antenna unit and the CPU (or MCU) ).

The Bluetooth antenna unit 110 includes at least three antennas 111, 113, and 115. The three antennas are installed at different positions in the vehicle.

The CPU 120 controls the first to third switches to turn on / off the first to third antennas. The first antenna 111 is turned on / off by the first switch 131. The second antenna 113 is turned on / off by the second switch 133. The third antenna 115 is turned on / off by the third switch 135.

When a smartphone generates a reference signal, the three antennas 111, 113, and 115 receive the reference signals, respectively, and measure RSSI values. The CPU calculates a distance (A) between the first antenna and the smartphone, a distance (B) between the second antenna and the smartphone, a distance between the third antenna and the smartphone based on the RSSI value of the received reference signal, (C) are measured. Using the three distance information (A, B, C, eg RSSI value) measured based on the reference signal, the CPU calculates the distance between the smartphone and the vehicle by triangulation.

According to the present invention, by utilizing a multi-pairing method based on Bluetooth communication, which is not a beacon-based and dramatically low price by turning on / off three Bluetooth antenna units by using one CPU using one CPU, Phone location can be grasped.

A description of the smartphone can be found in the vehicle's wearable smart key (eg, a smart watch). First, the wearable smart key is a wearable type wearable by a user. When the wearable smart key approaches the vehicle, the wearable smart key transmits respective control signals so as to control each antenna of the vehicle according to the action of the user. The wearable smart key may be a wrist watch worn by the user, or any other form or kind. For example, it may be a bracelet, a glove, a ring, a bracelet, a waistband, a necklace, an earring, and a pair of glasses that are not shown in the drawings but may be worn by a user. However, for convenience of description, a wristwatch, which is a wearable type accessory widely worn regardless of whether a person is young or old, is typically substituted into a wearable smart key according to the present invention.

When the wearable smart key is close to the vehicle, that is, when it approaches a radio wave area transmitted from a diversity antenna of a short range wireless communication device, which will be described later, it switches to a vehicle control mode.

The general mode means performing each unique function according to the type of the wearable smart key, and the vehicle control mode means performing a function of controlling each antenna of the vehicle. For example, the wearable smart key is a wristwatch worn on the wearer's wrist, and the general mode performs a function of displaying a date, a current time, etc., which is a function unique to a watch, And controls each antenna of the vehicle.

In addition, the wearable smart key includes a channel # 1 control signal transmitter or channel # 3 control signal transmitter for controlling each antenna of the vehicle, a reception antenna for receiving transmission radio waves of a short range wireless communication device installed in the vehicle, A transmitting antenna for transmitting a command of the channel # 1 control signal transmitting unit or the channel # 3 control signal transmitting unit to the short range wireless communication unit, and a battery for supplying power to the wearable smart key.

In addition, the wearable smart key according to the embodiment of the present invention is connected to a private network of a public network or an automobile maintenance company through the installation of a vehicle management application, Geographical information can be provided.

The Near Field Communication according to an embodiment of the present invention is a means for communicating vehicle control data through position tracking between a vehicle and a wearable smart key. The LF A location location tracking service (RSSI) to transmit a RSSI (Received Signal Strength Indicator) MAP to a radio frequency (RF) radio wave transmitted from a wearable smart key and to provide an RSSI value to RF DATA returned from the wearable smart key to track the position of the wearable smart key in real time (RTLS, Real-Time Location Service).

Here, the real-time location service uses radio waves of 2.45 GHz band and meets the 802.11b / g standard, similar to the location-based service (LBS) of the mobile communication network. The triangulation method is used to estimate the position of an object using triangulation method as a method used for position tracking. Trigonometric position estimation is based on Received Signal Strength Indication (RSSI) or Time of Arrival (ToA) techniques.

In addition, the communication medium uses a wireless LAN (Wi-Fi, IEEE 802.11b / g), that is, a short-range wireless communication network. This short-range wireless communication network has a bandwidth of 13.56 MHz and is a means for wireless communication with a very short distance. It includes LF, XBee, ZigBee, BlueTooth, Beacon and the like. Currently, data communication speed is 424 Kbit per second , Transportation, tickets, payment, and so on. In addition, the LF (Low Frequency) frequency is 30 to 300 kHz and the wavelength is 10 to 1 km, which is also called a km wave or a long wave. There is a feature that it can communicate far by simple device.

The received signal strength indicator (RSSI) MAP of the short range wireless communication device 200 according to an exemplary embodiment of the present invention includes ANT1 (x1, y1, z1), ANT2 (x2, y2, z2) (xx1, yy1, zz1), ANT2 (xx2, yy2, zz2), and ANT3 (xx3, yy3, yy3), and the RF DATA of the wearable smart key, which is an RSSI grant value returned to the RSSI MAP of the near- zz3).

In addition, according to an embodiment of the present invention, the RSSI MAP periodically transmits an ID and an RSSI value to track the precise location of the wearable smart key.

Hereinafter, a triangulation using the RSSI MAP algorithm using an RSSI MAP, which is a Real-Time Locating Service (RTLS) of the present invention, will be described in detail.

The triangulation method using the RSSI MAP is based on the mathematical use of the signal intensity according to the distance, and the RSSI is applied as the signal becomes weaker as the distance increases. In this case, the received signal strength (RSSI) in the wireless environment is expressed in units of dBm. The distance between the reference point and the mobile node is defined as a distance from the reference point to the mobile node It means to measure the value.

Therefore, the triangulation method using the RSSI MAP has three reference points as the coordinates [(x1, y1, z1), (x2, y2, z2), (x3, y3, z3) of the diversity antennas 111, ] To the RSSI MAP on the LF radio wave transmitted from the LF. The distances d1, d2 and d3 between the coordinates of the three points of each of the diversity antennas 111, 113 and 115 and the wearable smart key can be obtained by the following relational expression.

[Equation 1]

Also, the present invention can measure distance using the received signal strength (RSSI) MAP, arrival time (ToA), and arrival time difference (TDoA) from Equation (1).

Accordingly, the implementation of the communication algorithm having the real-time location tracking service according to the embodiment of the present invention can be applied to a gyro sensor, an acceleration sensor for detecting impact and tilt values, a blood pressure / pulse measurement sensor, a motion sensor for detecting movement, The various antennas 500a to 500n of the vehicle are controlled by convergence with various physical mechanisms such as a displacement sensor having a moving object, a proximity sensor having movement of an object, a gravity sensor using an inertia of an object, a fingerprint and voice recognition sensor, You can have unique features that you can do.

An ECM (Electronic Control Modules) 300 is an engine control unit (ECU) that measures the ignition timing value and the fuel injection value, which are the initial settings of the engine revolution speed, the intake air amount, the intake pressure, And corrects the water temperature sensor, oxygen sensor, etc., and adjusts the opening and closing rate of the injector, which is the fuel injecting device. In addition, a limit value is set in advance to prevent overload of each part of the engine, and a CAN that communicates with the antennas 500a to 500n is communicated to the antennas 500a to 500n.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. Should be regarded as belonging to the above-mentioned patent claims.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept as defined by the appended claims. But is not limited thereto.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

Claims (1)

A smartphone for generating a reference signal so as to control each driving unit of the vehicle when the vehicle approaches the vehicle;
At least three diversity antennas for transmitting respective RSSI (Received Signal Strength Indicator) MAPs to LF (Low Frequency) radio waves and transmitting them;
And a CPU for assigning an RSSI value to each RF DATA returned from the smartphone to estimate the position of the smartphone in real time,
The CPU periodically transmits each RSSI MAP together with its own ID to transmit the RF data returned from the smartphone periodically in order to track the position of the smartphone in real time through the diversity antenna And measures a distance value between each of the diversity antennas, which is a reference point serving as a reference on a two-dimensional plane, and the smart phone, which is a mobile node, by a triangulation method using the RSSI MAP, And estimates the real-time position of the phone.

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