KR20130076221A - Auto-correction of the apparatus for tracking position using bluetooth mounted in the smart phone - Google Patents

Abstract

PURPOSE: An automatic correction function method of a position tracking device using Bluetooth of a smart phone is provided to confirm a current position of a protectee with a smart phone by using communication by a Bluetooth module. CONSTITUTION: A smart phone (10) of a moving protectee confirms route information and a current position of the protectee in real time by using a terrestrial magnetism sensor, a gyro sensor, an acceleration sensor, and an altitude sensor of a sensor terminal (20). When there are the smart phone and the sensor terminal in a 1m range, the sensor terminal automatically resets the route information and the current position. [Reference numerals] (10) Smart phone; (30) Main controller; (40) Bluetooth module; (51) Terrestrial magnetism sensor; (52) Gyro sensor; (53) Angular velocity sensor; (54) Altitude sensor

Description

Auto-correction of the apparatus for tracking position using Bluetooth mounted in the smart phone}

The present invention relates to a method for checking the current position and the moving path in a short-distance building using a Bluetooth of a smart phone, and more specifically, using a geomagnetic sensor, a gyro sensor, an acceleration sensor, an altitude sensor of a sensor terminal. The present invention relates to a method of determining location information of a guardian in a building within 100m by communicating a Bluetooth module and a smartphone with information about a movement route.

The position information system developed in the related art is a wireless terminal sensor based on IEEE802.15.4 equipped with a gyro sensor and a 3-axis acceleration sensor, and is a device composed of a wireless base station and a server device. The sensor terminal wirelessly transmits the direction information of the pedestrian of the gyro sensor and the acceleration sensor information to the server device by integrating the vector of the acceleration time to the server device, and the server device tracks the movement path of the terminal by time-integrating the vector of acceleration. It is a way to figure out the location. In addition, the currently used Mia location finder is to transmit the current location information using the GPS device to the base station of the carrier to be sent back to the mobile phone to determine the location. These methods are difficult to use because of the complexities of the system construction for the necessity of wireless base stations and server devices and the high cost for users to use.

Children and dogs are often lost due to carelessness in crowded urban centers, large bookstores and children's parks. The present location is a method of finding the current location by the GPS receiver, and the current location of the ward is linked with the base station using the 3G network of the carrier. However, it is burdened by the problem that GPS information is not available in the building and the complexity and cost of joining a carrier. It is intended to solve the existing problem by a method that can identify the current location of the guardian directly on the smartphone by using the Bluetooth module to communicate the location information and the movement route of the sensors of the sensor terminal in the building without passing through the communication company base station. .

Gyro and acceleration sensors are used as sensors to track the path taken from the current position. The sensor terminal converts the analog information of the sensors into a digital signal and transmits the location information to the smartphone through the Bluetooth module. It is a method of determining the location by processing the location information received from the smartphone. In addition, the movement information of the sensor terminal can grasp the distance and the movement path of the sensor terminal moving based on the smartphone, the vector value is calculated while the smartphone is moving. The device uses Bluetooth communication that is used at a short distance, so if a ward is lost, it can be found right away (within 100m radius), but not beyond 100m. Rather than being found when they are far away, they are better suited to prevent the ward from falling away within the radius of the guardian's close range. If the smartphone and the sensor terminal is within 1m, by automatically resetting the sensor terminal to remove the location information accumulated up to now, it is possible to prevent the error about the location information that can be continuously calculated and accumulated. After that, when the sensor terminal is out of 1m, it resets again to start calculating the position information, and accumulates the position information to grasp the information on the movement path.

As described above, the present invention can collect information about the current position and the movement path by applying the geomagnetic sensor, gyro sensor, acceleration sensor, altitude sensor to the location of the child, pet dog in the building. By Bluetooth communication, the guardian within a short distance (100m) can find the location by checking the path of the guardian using the smartphone. It is a function that can be used even without subscribing to a base station or a communication server by utilizing the Bluetooth function of a smart phone, so there is no burden of users. In addition, the sensor terminal position alarm setting according to the radial distance of 50m, 70m, 100m can be prevented by moving away from the guardian. The position alarm function allows the guardian to check the position of the guardian at a short distance and prevent them from falling away and preventing them from being lost.

1 is a block diagram of a terminal using sensors according to the present invention;
2 is a positional alarm diagram according to the distance of a Bluetooth device.
3 is an automatic reset distance diagram of a smartphone and a sensor terminal

The geomagnetic sensor 51 of the sensor terminal 20 detects the azimuth angle by using the earth magnetic field to detect east, west, north and south. In the geomagnetic sensor 51, three sensors capable of measuring the intensity of the magnetic field are attached in the X, Y, and Z directions, and the magnetic field direction applied to the sensor is measured by the sum of the output vectors between the three sensors.

The gyro sensor 52 grasps the direction of the pedestrian. It senses the direction by numerically the value of the angle of rotation of the object in unit time based on one axis. The gyro sensor 52 detects the angular velocity and measures how much the angle moves in one second. Coriolis forces are generated when an object moves, using the formula for Coriolis forces to detect the angular velocity acting on the inertial system. In general, MEMS (Micro Electro Mechanical System) gyro accuracy is 10 ~ 100 deg / hr, if the sensor signal processing well can be used as 1deg / hr. It means that the posture changes by 1 degree for 1 hour when there is no input. The gyro sensor 52 requires the gyro to be very precise in order to calculate an accurate posture. The accelerometer sensor is basically used as a sensor for compensating the gyro.

The acceleration sensor 53 detects the motion by calculating the increase / decrease ratio of the speed with respect to the linear motion in a specific direction. The acceleration sensor 53 outputs the magnitude of the acceleration applied to the object. The three-axis acceleration sensor having a range of three axes can measure the acceleration in three-dimensional space in three axes of the x, y, and z axes. That is, the movement of the object can be detected from the inclination angle of the object and the acceleration in each direction based on the gravity acceleration. The angle of inclination of the object based on the acceleration of gravity is 1G of gravity in the vertical direction of the earth's gravity, and 1G is detected when the horizontal acceleration sensor is tilted 90 degrees in response to gravity as it is inclined. Therefore, gravitational acceleration is sin (leaning angle), so it is possible to detect the tilted state and the ground direction.

Altitude sensor 54 serves to detect the altitude of the high-rise building. Pressure sensors are used to measure altitude, and most atmospheric pressures are measured and a temperature sensor is built in to compensate for the temperature. The semiconductor piezo-resistance effect of changing the resistance value under pressure (force) is used. When the pressure (force) deforms the diaphragm, the value of the gas diffusion piezo resistor attached to the pressure reducing element changes. Using this principle, four piezoresistors composed of a Wheatstone bridge circuit are driven with a constant current, and under pressure, a constant pressure signal proportional to the pressure can be obtained at the output stage, and a temperature compensation circuit is built in to maintain a constant level. .

The current position and position change are converted into analog signals from the main controller 30, which serves as an A / D converter, from the analog signals of the geomagnetic sensor 51, the gyro sensor 52, the acceleration sensor 53, and the altitude sensor 54. Done. The converted signal is sent to the Bluetooth module 40 and sent to the guardian's smartphone 10 in the short distance 100m using Bluetooth communication. The digital signal received by the smartphone 10 is calculated using the principles of speed, acceleration and position sensors. Velocity becomes velocity by integrating acceleration by time, and conversely, by deriving velocity by time. Knowing the initial velocity and then measuring the acceleration continuously will yield the velocity. The position is obtained by integrating the velocity. Again, the initial position is the integral constant, and if you continue to measure the acceleration, you will continue to know the change in velocity and integrate it to find the position. The calculated location information is displayed on the location of the map of the smartphone (10).

The device reports the distance when the guardian and the ward are away from each other. When the distance between each other by activating the operation of the sensor terminal 20 with the smart phone 10 can determine the distance and the current location and the moving path away. In addition, you can set the position alarm in 50m, 75m, 100m as the basic unit according to the distance. If the distance is close, the alarm sound of the 10 sec cycle sounds, and as the distance increases, the situation can be expressed by the alarm sound of the fast cycle of the 1 sec cycle. The alarm sound frequency can be set arbitrarily. The guardian can use the smartphone to determine the situation in advance and cope with it.

The sensor terminal is automatically reset by checking the distance when the distance to the smartphone approaches a distance of less than 1m. This function resets the current location information and the movement path information and organizes them in the accumulated information, thereby preventing errors in the continuously accumulated location information. Within 1m of the distance, processing of all information is stopped and only the information on the distance is processed, and the communication period (1sec) with respect to the distance information with the smart phone enters the standby mode. After that, when the distance between the smart phone, the sensor terminal, and 1m or more is confirmed, the sensor terminal resets and starts processing the current information and the movement route information. Automatic reset according to distance is a method of resetting the sensor terminal to prevent the error of the information that is continuously processed even when the position information is near.

10: Smartphone
20: sensor terminal
30: main controller
40: Bluetooth module
50: sensor unit
51: geomagnetic sensor
52: Gyro Sensor
53: acceleration sensor
54: altitude sensor

Claims (2)

How to check the current location and the movement route of the ward using the geomagnetic sensor, gyro sensor, acceleration sensor, altitude sensor of the sensor terminal in real time on the smartphone of the guardian on the move using Bluetooth communication. When the smart phone and the sensor terminal is within a close distance (1m), the sensor terminal is automatically reset to reset the location information and the movement route information up to the present. By automatically resetting and resetting the continuously calculated and accumulated position information, this method automatically corrects the position information by preventing errors on the information that is continuously processed even if the position is arranged. At this time, the communication between the smartphone and the sensor terminal only processes the information on the distance, and the distance information confirmation period (1sec) with the terminal is lengthened and enters the standby mode. When the sensor terminal is out of the proximity distance (1m) is reset again to communicate all the information on the current location information and the movement path information with the smartphone via Bluetooth.

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