KR20110006401A - Navigation system for blind people - Google Patents

Abstract

PURPOSE: A navigation system for blind people is provided to enable a terminal to receive the information of exact location of obstacles when passing by the obstacles since an active type RFID is attached to the corresponding obstacles. CONSTITUTION: A navigation system for blind people comprises a navigation terminal(10) and a digital gyroscope. The navigation terminal comprises a GPS receiver and gets the present position of pedestrians. The navigation terminal transfers location information to blind people(200) through voice. The navigation terminal comprises an RFID reader(14) and grasps the location and kind of the obstacles. The digital gyroscope guides the progressive direction of the blind people to the walking direction. The digital gyroscope corrects position errors created from the GPS receiver.

Description

Navigation system for blind people {Navigation system for blind people}

The present invention relates to a navigation system for the visually impaired, specifically, to determine the current position of the pedestrian through the GPS receiver mounted in the navigation for the visually impaired, and to accurately determine the walking direction of the pedestrian through the digital gyroscope to build already Information on obstacles in the left, right, front, and rear through the obstacles and facilities database, RFID, and front sensor to help the visually impaired people to easily walk on the road and safely guide them to the point where they want to go. It relates to a navigation system for.

In general, a GPS receiver is a device that simply receives a signal, such as a radio, and its principle is to indicate a location by calculating a location through a time difference from signals simultaneously transmitted from three to four satellites receiving the signal. Since a certain amount of error exists in the GPS signal received by the receiver, the position within the error range is determined by software to match the road centerline with the road center to determine the road and sidewalk that are currently driving or walking.

GPS currently being service can get accurate time with latitude, longitude, altitude location as well as three-dimensional speed information, and location accuracy varies between military and civilian use. For civilian use, the horizontal and vertical errors are about 10-15m and the speed measurement accuracy is 3cm per second. Therefore, with current technology, the determination of whether a pedestrian can walk without leaving the sidewalk is somewhat inaccurate.

In addition, since the GPS receiver mounted on the user's terminal receives satellite signals, there is an inconvenience that reception is impossible because the sky is obscured in a building, a tunnel, and an underground parking lot.

A digital gyroscope is a sensor that measures itself in which direction and angle it is mounted on a robot. It is also called a gyro sensor. It is mainly used for the automatic direction detection of unmanned aerial vehicles and robots, and recently, the gyro sensor is also used to measure the vibration of camcorders, digital cameras and mobile phones. In particular, when applied to a car, the car can determine its position without using GPS using the vehicle speed.

When GPS receivers and digital gyroscopes are applied to navigation terminals and walked, the current location and driving direction of pedestrians can be known, but information on pedestrian obstacles in front and rear of pedestrians cannot be known. In order to overcome this problem, RFID technology should be applied to the terminal to provide pedestrians with information about obstacles in advance.

RFID has been applied to various fields such as distribution, logistics, and WMS as the most essential element of ubiquitous computing technology, but it has been applied to limited industrial fields such as corporate networking, automation, and intelligence.

The RFID industry, which has been applied only to limited industrial sectors, has been recently activated and technological developments have been rapidly developed, which necessitates the need to expand to the public and customer service level.

RFID is an automatic identification technology that can freely identify and record attached tag information without directly contacting target objects using wireless communication technology. It is composed of tags, antennas, readers and middleware, and application service platforms. In order to provide an RFID service through an RFID reader, an RFID reader must be mounted on the terminal. The ultimate goal of a mobile RFID terminal is to embed an RFID reader in the mobile terminal. However, many studies are being conducted because of various technical problems such as radio wave interference of RFID reader and recognition distance problem.

The difference between the mobile RFID and the general RFID system is not only a physical reader but also a necessary element of the business model that enables the popularization of RFID and B2C-type public and customer service as an information terminal in the ubiquitous era.

The service configuration of the mobile RFID includes a tag having identification information of a thing, a terminal equipped with a reader, an object directory server (ODS) indicating a server location of an identification code and related information, and an object information having OIS (real information of a tag). Service).

After reading the tag information installed in a specific product, the reader receives the information of the OIS server from the corresponding ODS and provides the contents. The communication between the mobile RFID reader, the ODS and the content server is performed through the mobile communication network.

The service promotion direction of mobile RFID can be divided into tag-based service and reader-based service. Tag-based service is equipped with RFID tag on credit card or mobile phone, and when a user carries a fixed reader installed in the service space such as department store or discount mart, it recognizes the tag, and various information suitable for the recognized customer It is a service that is used as information such as moving copper wire. Since it takes some time to spread readers to general users, it provides preferential tag-based services. The reader-based service is a service that provides the corresponding information when a user attaches an RFID tag to a specific product and a specific place and then touches the reader mounted on the mobile phone to the tag, which is the ultimate service goal of the mobile RFID described above. .

Mobile RFID is expected to penetrate deep into life as an information terminal in ubiquitous environment by applying various business models to further develop the use of mobile phones. Providing additional services, such as providing context-aware services that take into consideration the characteristics of the user's location and propensity, is expected to gradually develop into the USN (Ubiquitous Sensor Network), which enables ad hoc networks to be established between mobile phone terminals. do.

The present invention has been invented to solve the above problems, the object is to provide a navigator navigation and pedestrian obstacle notification service system for the visually impaired, in particular through the GPS mounted on the navigation for the visually impaired pedestrians Service system that informs information about obstacles located in front, left, and rear by using pedestrian's walking direction as auxiliary means through digital gyroscope when it is not able to accurately determine the direction of pedestrians such as range The information on the pedestrian obstacles and guide boards installed in India is constructed by the field survey and the active RFID is attached to the obstacles in order to deliver the exact location to the terminal. Implement a system to receive the There is.

Specifically, it is a navigation device equipped with GPS, a digital gyroscope, and an RFID reader. It is possible to use a digital gyroscope when it is not possible to calculate the direction by software when the current position is detected by GPS and the stop state or direction is changed. It is equipped with a device to measure the direction of movement, and when a pedestrian passes an obstacle in India, it receives an obstacle signal through RFID and informs the pedestrian about the obstacle to build a system that can prevent safety accidents.

It is also an object of the present invention to provide a pedestrian obstacle notification service system that can provide information on obstacles appearing in the course of travel to a destination by loading road information as well as roadside obstacle information database on the terminal.

In addition, the development of the voice support navigation for the disabled equipped with a function that can be attached to the wand for the visually impaired to move the equipment efficiently to provide related services. In order to inform users of pedestrian obstacles, unlike the existing car navigation system, new nodes / links and POIs (Points of Interest) centered on sidewalks are developed to develop differentiated services for pedestrians. The purpose is to provide a function of sending this information to the terminal to inform the distance to the obstacle through the earphone or in some cases using the vibration to inform the distance to the obstacle by the strength of the vibration.

The present invention for achieving the above technical problem is provided with a GPS receiver, grasp the current position of the pedestrian in X, Y coordinates, and transmits the location information to the visually impaired voice, RFID reader is installed in India A navigation terminal that reads data on obstacles and signs from a plurality of RFID tags to identify the location and type of obstacles, and when the visually impaired person stops at a branching point (crossroad, three-way), guides the direction of the visually impaired in the walking direction, It includes a digital gyroscope for correcting the position error generated in the GPS receiver.

In one embodiment, the navigation terminal further includes a vibrator for transmitting obstacle position information as a vibration signal.

In one embodiment, the navigation terminal further includes a pushpin pad for transferring obstacle location information in a braille message.

In one embodiment, the navigation terminal is characterized by correcting the position of the current visually impaired by reading the position data from a plurality of RFID tags installed in India.

In one embodiment, the navigation terminal, it is characterized in that the removable can be attached to the cane for the visually impaired can easily carry.

In one embodiment, the navigation terminal further includes a front detection sensor for detecting an object in front of the front, and providing the detected signal to the user a distance signal for the front obstacle.

In one embodiment, the navigation terminal and the front sensor is characterized in that the transmission and reception with each other by Bluetooth communication.

In one embodiment, the navigation terminal further includes a bookmark function to register a location searched by a visually impaired person or a frequent route.

According to the navigation system for the visually impaired according to the present invention, when a visually impaired person visits a destination, the destination is provided as a shortcut key in advance and the function is easily selected by selecting at that time, and using a GPS and a digital gyroscope. By minimizing the walking direction and errors of pedestrians, the information on the walking obstacles in front, rear, left and right of the pedestrians is greatly effective in preventing safety accidents of the visually impaired.

In addition, it can be used as a pedestrian navigation system that is useful not only for the visually impaired but also for general pedestrians through the construction of India-centered data, which makes it easy to find the way through facility services centered in India when searching for strange roads. will be.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiment of the present invention may be modified in various forms, the scope of the invention should not be construed as limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art. Therefore, the shape of the elements in the drawings and the like may be exaggerated to emphasize a more clear description. It should be noted that the same members in each drawing are sometimes shown with the same reference numerals. In addition, detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention are omitted.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the present invention, a navigation system for the visually impaired of the present invention will be described in detail.

1 is a view for schematically showing a navigation system for the visually impaired of the present invention, Figure 2 is a view showing the appearance of a navigation terminal applied to the navigation system for the visually impaired of the present invention, Figure 3 is a present invention This is a structural diagram to show the communication structure of the navigation system for the visually impaired.

1 to 3, the navigation system for the visually impaired 200 of the present invention is equipped with a GPS receiver, grasp the current position of the pedestrian in X, Y coordinates, based on the location information and the surrounding facilities and Information on obstacles is transmitted to the visually impaired through a Bluetooth earphone 11, and an RFID 12 is provided to read data on obstacles and signs from a plurality of RFID tags installed in India, and the location of the obstacles and When the visually impaired person stops at the navigation terminal 10 and the branching point (intersection, three-way) for grasping the type, guides the moving direction of the visually impaired 200 in a walking direction, and a position error generated by the GPS receiver 15. And a digital gyroscope 14 for correcting the deviation.

Here, the GPS receiver 15 will be described. In general, GPS basically uses the principle of triangulation. In a typical triangulation, a position of an unknown point is determined by the size of two angles except the point and the length of the side between them. In contrast to traditional triangulation, GPS determines the location of an unknown point by measuring the length of two sides between points it wants to know.

The distance from the satellite to the receiver is calculated by measuring the time difference between the time of receipt and the time of reception of the code signal generated by each satellite and multiplying it by the speed of light.

Distance = speed of light * elapsed time

In fact, in order to determine the position of the receiver based on the position of the satellite, in addition to the distance data, it is necessary to know the exact position of the satellite. The position of the satellite is used to calculate the orbital force transmitted from the GPS satellite 100.

Compared to car navigation systems, pedestrian navigation systems are more narrow than roadways because they walk through India. Therefore, if a lot of GPS errors occur, it is difficult to expect accurate location services, especially for the visually impaired, such errors can be fatal defects.

In addition, the present invention uses a digital gyroscope to minimize the error range and to estimate the direction of the pedestrian.

In addition, the digital gyroscope used in the present invention is a sensor for measuring the angle (angular velocity) of the moving object.

If you think about a sphere, the axis of rotation of the sphere has the characteristic of keeping constant. In addition, when the rotation axis of the sphere is a reference, the inclination with respect to the reference axis can be easily known. Gyro (Gyro) is a sensor that detects the rotation angle of the object using the nature to maintain the movement. It can be seen that the accelerometer is inclined to some extent in the vertical direction. The magnitude of the acceleration (g) and the angle of the vertical (ceta) of the accelerometer installed on the object are as follows.

A = g * cosθ

Therefore the inclination angular velocity (ceta)

θ = cos ^-1 (A / g)

When an object moving at a constant speed rotates, a collision force is generated perpendicular to the direction of travel, and a vector synthesized with the direction of travel vector appears. Therefore, the magnitude of each velocity is calculated by observing the composite vector.

The digital gyroscope outputs the angular velocity as an electric quantity of voltage. For example, it outputs in / second, that is, when it doesn't rotate at all, and outputs in reverse rotation / second when / second rotation, that is, angular velocity that rotates between 1 second.

The direction is corrected using the angular velocity obtained through the digital gyroscope, and the corrected position and coordinate points of the pedestrian are calculated by estimating the speed or distance of the pedestrian's movement obtained through GPS.

On the other hand, the navigation terminal 10 can read the position data from a plurality of RFID tags installed in India, it is possible to correct the position of the current blind.

Meanwhile, the navigation terminal 10 may further include a tack pad to transmit the vibrator or obstacle location information in a braille message to transmit the obstacle location information as a vibration signal. This is provided for the convenience of the visually impaired 200.

In addition, the navigation terminal 10, the visually impaired 200 may be used to make a small size to be attached to, detachable to the blind 13 for the visually impaired (200).

Meanwhile, the navigation terminal 10 may further include a front detection sensor 20 that detects an object in front of the vehicle and provides the detected signal to a user with a distance signal for a front obstacle. The visually impaired 200 does not look ahead, in order to prevent accidents caused by poor GPS reception may be detected in advance, by detecting the perspective of the obstacle in front of the signal to the navigation terminal (10) This is to inform you through sound or vibration. Means for transmitting the above sound or vibration may use a Bluetooth communication scheme.

In addition, the navigation terminal 10 may be further provided with a bookmarking function to register the location searched frequently or the way frequently searched by the visually impaired 200. Specifically, when the visually impaired 200 departs and presses the "departure" button (not shown), and when the destination arrives at the destination, and presses the "arrival" button (not shown), the route traveled by the visually impaired 200 automatically moves to the navigation. It is saved and you can enter it as a shortcut. Even if the visually impaired person 200 who does not see the screen through them does not necessarily search for a destination, the route that is moved more than once can be easily moved through the destination route guidance service of the navigation without a helper, which means that the visually impaired people 200 or more times If you go to the same place by saving the way you went to your favorite place to eliminate the inconvenience of searching for the destination again.

The embodiment of the navigation system for the visually impaired of the present invention described above is merely exemplary, and those skilled in the art to which the present invention pertains may various modifications and other equivalent embodiments therefrom. You will know well. Therefore, it will be understood that the present invention is not limited to the forms mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims. It is also to be understood that the present invention includes all modifications, equivalents, and substitutes within the spirit and scope of the invention as defined by the appended claims.

 According to the navigation system for the visually impaired of the present invention, it is possible for a visually impaired person to safely guide a road to a desired destination without a guide dog or surroundings. In addition, the public can also be useful when you want to go down the road.

1 is a view for schematically showing a navigation system for the visually impaired of the present invention.

2 is a view showing the appearance of a navigation terminal applied to the navigation system for the visually impaired of the present invention.

3 is a structural diagram illustrating a communication structure of a navigation system for the visually impaired according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: navigation terminal 11: earphone

12: RFID 13: Wand

14: RFID reader 15: GPS receiver

16: digital gyroscope 100: satellite

200: blind

Claims (8)

GPS receiver 15 is provided, and grasps the current position of the pedestrian by X and Y coordinates, and transmits the location information to the visually impaired by voice, RFID reader 14 is provided with a plurality of RFID tags installed in India ( A navigation terminal 10 for reading the data on the obstacles and signs from the 12) to determine the location and type of the obstacles; It includes a digital gyroscope 16 to guide the progress direction of the visually impaired in the walking direction when the visually impaired stops at a branch point (range, three-way), and to correct the position error generated by the GPS receiver 15 Navigation system for the visually impaired. According to claim 1, The navigation terminal 10, Navigation system for the visually impaired further comprises a vibrator for transmitting the obstacle position information as a vibration signal. According to claim 1, The navigation terminal 10, Navigation system for the visually impaired further comprises a push pad for transmitting obstacle location information in a braille message. According to claim 1, The navigation terminal 10, Navigation system for the visually impaired, characterized in that to read the position data from a plurality of RFID tags installed in India to correct the current position of the blind. According to claim 1, The navigation terminal 10, Navigation system for the visually impaired, characterized in that the visually impaired (200) can be attached to, detached to the cane for the visually impaired. According to claim 1, The navigation terminal 10, Navigation system for the visually impaired, further comprising a front sensor 20 for detecting an object in front of the object and providing the detected signal to the user a distance signal for the front obstacle. The method according to claim 6, The navigation terminal (10) and the front sensor 20 is a navigation system for the visually impaired, characterized in that for transmitting and receiving each other by Bluetooth communication. According to claim 1, In the navigation terminal 10, Navigation system for the visually impaired, characterized in that it further includes a bookmarking function to register a frequent way by storing the location searched by the visually impaired (200) or a route moved more than once with a shortcut key.

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