DE102016107732A1 - Position information exchange system and transmission and reception port - Google Patents

Abstract

A position information exchange system capable of transmitting and receiving high resolution position information in a small amount of data as well as a transmission and reception port are provided. [Solution] In a position information exchange system in which position information of a transmission terminal (1S) is exchanged (or bilateral) by a reception terminal (1R), the transmission terminal has location means (11) for obtaining its own position information as longitude and latitude data (X, Y) Coding means (12) for converting the longitude and latitude data into position codes (α, β) corresponding to longitude and latitude differences (X, Y) from an origin (10) in a network (20) by dividing a map area based on on a geodetic system, in a network of a predetermined size (Lo, La), and transmission means (13) for transmitting the position code via the wireless data communication, and the reception terminal has receiving means (13) for receiving the position codes (α, β ) and decoding means for decoding the longitude and latitude th (X, Y) of the transmission terminal (1S) from the position codes (α, β) as the longitude and latitude data (X, Y) in the network (20) on which the receiving terminal (1R) is arranged, or adjacent thereto networks , on.

Description

Technical area

 The present invention relates to a position information exchange system between transmission and reception terminals using a location system and wireless data communication and a transmission and reception terminal used therein.

State of the art

Among automobiles having a navigation function provided by a satellite positioning system such as GPS, "inter-vehicle communication" has been studied in which data such as vehicle position and cruising speed are transmitted and received to improve mutual safety. With the similar idea was also the "pedestrian vehicle communication" investigated, in which position information between a pedestrian, who carries a mobile telephone connection with the GPS function, and the car are exchanged.

 Patent Literature 1 relates to a technology for estimating the pedestrian's own position on the basis of the positional information transmitted by a base station aimed at pedestrian navigation, and discloses the technology in which a range of the base station is set as a radius a communicable distance defined by communication standards is used, and at a time when data communication is established, it is determined that entry into the area occurs from an outer area edge. However, double-sided positions in the same area can not be set, and it can not be used for a system for mutually exchanging position information or pedestrian vehicle communication.

On the other hand, the data size in the location system inevitably increases when high-resolution position information is to be transmitted to improve the accuracy of location finding, and there is a problem that they are not common in a data frame due to the limitation on the number of data locations can be transmitted. Patent Literature 2 suggests that, in a communication network in the vehicle, data for transmission is divided into high-order and low-order locations, but it is not intended to reduce the data itself, and it can not be for data communication between vehicles or used for pedestrian vehicle communication.

[Bibliography]

[Patent Literature]

• [Patent Literature 1] Disclosed Japanese Patent Application No. 2006-53047
• [Patent Literature 2] Disclosed Japanese Patent Application No. 2014-218167

Summary of the Invention

[Problem to be Solved by the Invention]

When existing communication is used, a data length that can be used to transmit position information is limited in many cases. For example, if the position information is to be embedded in a physical transmission and reception address in a wireless LAN, a total of 24 to 48 bits may be used, but there is a trade-off between the number of digits of the entire data and the resolution due to the limited data length, and if the resolution required for communication between the vehicles is to be determined, any longitude and latitude digits that can indicate all areas on the earth can not be covered. On the contrary, if all the digits of longitude and latitude are indicated by the limited bit length, the lowest digit of the display becomes large and high-precision position information can not be transmitted.

The present invention has been made in view of the above-mentioned circumstances and has an object to provide a position information exchange system capable of providing the transmission and reception of high-resolution position information in a small amount of data as well as a transmission and reception port.

[Means to solve the task]

In order to solve the above problem, the inventors have found, as a result of careful research, that since a radio wave range of the wireless communication is limited and a communication counterpart with which the position information is to be exchanged with high resolution is in the vicinity, by limiting the one to be transmitted Position information at approximately a range of a wireless radio wave and omitting other than this information, the amount of data does not become large, even if the position information with high resolution and the inventors conceived the present invention.

That is, the present invention resides in a position information exchange system having at least one transmission terminal and at least one reception terminal in which at least one of the transmission terminal and the reception terminal is mounted on or carried by a movable body and positional information of the transmission terminal is shared by the reception terminal that
the transmission terminal locating means for obtaining its own position information as longitude and latitude data; coding means for converting the longitude and latitude data into a position code corresponding to longitude and latitude differences from an origin in a network by dividing a map area based on a geodetic system into Network of a predetermined size and having transmission means for transmitting the position code via the wireless data communication; and
the receiving terminal comprises receiving means for receiving the position code and decoding means for decoding the longitude and latitude data of the transmission terminal from the position code in the network on which the receiving terminal is located, or adjacent thereto networks, as longitude and latitude data.

Advantageous Effect of the Invention

The position information exchange system according to the present invention has the following effects by the above-mentioned configuration.

The reception terminal receiving the position code transmitted via the wireless communication may inevitably exist only within a range of the wireless radio waves. Thus, by limiting the longitude and latitude data at a current location of the transmission port to only the longitude and latitude differences from the origin in the network obtained by dividing the map area into the predetermined size, that is, by using the longitude and latitude differences of Origin in the network, instead of the longitude and latitude data uniquely assigned to the entire globe, a data amount of the position information transmitted via the wireless communication can be reduced dramatically without causing a practical disadvantage.

In addition, since the amount of data is reduced, the burden of data conversion or transmission and reception is reduced and an improvement in processing speed or stable processing is enabled, and high-resolution position information can be handled, whereby the position information can be exchanged with high accuracy ,

In addition, since the amount of data is reduced, the position code can be embedded in a free space of the data communication when the wireless communication is performed, and when the position information is exchanged by performing communication at all times, there is no need to exclusively use a wireless communication band by the position information data, but the wireless communication band can be effectively used, and various applications including inter-vehicle communication and pedestrian-vehicle communication can be expected.

In addition, in the case of position information exchange between moving bodies, the position information can be mutually exchanged without passing through a base station or the like, and thus there is no need to install a single base station, but the position information can be exchanged by using existing equipment even if There is no base station nearby. For example, by exchanging positional information between an automobile or a motorcycle with a pedestrian, mutual positions can be confirmed even in a place that is difficult to survey, accidental collision can be further prevented, and it can be used as a preventive safety device for preventing Accidents are used.

In the present invention, the coding means has calculating means for converting a remainder obtained by dividing the longitude and latitude data by lengths in longitude and latitude directions of the network into positional codes as longitude and latitude differences, and the decoding means is preferable Calculating means for decoding the longitude and latitude data of the transmission terminal by multiplying the lengths in the longitude and latitudinal directions of the network by the position codes. In this mode, as soon as a mesh size (lengths in the longitude and in the latitudinal direction) can be divided by dividing the map area into a network is set, only by dividing without determining the origin on the network, the position code (longitude and latitude differences) are calculated as a coordinate in the network, and only by multiplying the network size by the position code, the position information of the transmission terminal can be decoded ,

With respect to the present invention, in a mode in which at least one of the transmission terminal and the reception terminal is a transmission and reception terminal including the location means, the coding means, the transmission means, the reception means and the decoding means, the position information with other transmission and reception terminals can be mutually exclusive it can be used for improved mutual safety for various applications including inter-vehicle communication and pedestrian-vehicle communication.

The receiving terminal or the transmitting and receiving terminal of the present invention preferably further comprises means for calculating a distance from the own position obtained as longitude and latitude data to a position of the transmission terminal, which are decoded as longitude and latitude data by the decoding means , Not only by displaying the position information but by calculating the distance, a message or an alarm may be immediately issued as the distance approaches or becomes smaller or similar to a predetermined value.

In a preferred embodiment of the present invention, since the size of the network division is selected such that the length in the latitudinal direction and the length in the long-term direction of the network becomes twice as large or larger than the range of the radio wave of the wireless communication, the position of the transmission terminal invariably be unambiguously determined within the range of the radio wave of the wireless communication.

In the present invention, the wireless data communication is preferably a wireless LAN. By using a format of the widely-used existing wireless LAN, the positional information about the communication between vehicles or the communication between pedestrian and vehicle can be easily and inexpensively exchanged.

In a preferred embodiment of the present invention, the transmitting means includes means for transmitting a radio wave guidance signal with the position code and is capable of transmitting the radio wave guidance signal via the wireless communication, and the receiving means may receive the radio wave guidance signal. As described above, in the position information exchange system of the present invention, since the position information can be compressed to a small amount of data by position coding, the position code can be embedded in the radio wave direct signal of the wireless LAN, and by using the radio wave guidance signal generated at a predetermined interval during the time wireless communication is transmitted (used pilot signal in the transmission mode in a network communication), the position information can be transmitted without passing through a communication establishment method in an upper protocol level. As a result, there is no temporary delay due to the communication establishment method with the advantage that computation resources required for the communication establishment method can be saved.

In a preferred embodiment of the present invention, the coding means is able to select a network partition size of the network, and the transmission means can transmit the index of the size of the partition selected by the coding means in addition to the position code, and the decoding means is adapted to Thus, by decoding the longitude and latitude data of the transmission port from the position code on the basis of the size of the division sizes, and by changing the network size according to a type, speed, and use environment of the movable body, exchange of the position information having a higher utility value can be realized become.

The present invention is also directed to a transmission terminal used for the aforementioned position information exchange system and to a transmission terminal including the location means, the coding means and the transmission means.

In addition, the present invention is also directed to a receiving terminal used in the aforementioned position information exchange system and a receiving terminal having the locating means, the receiving means and the decoding means.

In addition, the present invention is also applicable to a transmission and reception port used in the aforementioned position information exchange system, as well as to a transmission and reception port Transmission and reception terminal with the location means, the coding means, the transmission means, the receiving means and the decoding means addressed.

[Brief Description of the Drawings]

1 FIG. 10 is a block diagram showing a transmission and reception terminal constituting a position information exchange system according to an embodiment of the present invention, in which FIG 1 (a) is a block diagram in the transmission, and 1 (b) is a block diagram in the recording.

2 FIG. 10 is a flowchart showing the processing in the transmission in the position information exchange system according to the embodiment of the present invention. FIG.

3 FIG. 12 is a flowchart showing the processing upon reception in the position information exchange system according to the embodiment of the present invention. FIG.

4 Fig. 10 is a diagram showing the position information of the transmission terminal displayed on a map which is divided into a network by a MOD network.

5 FIG. 12 is a diagram illustrating a relationship between a reception terminal displayed on the map divided into the network by the MOD network, its radio wave range, and a transmission source candidate shared by the reception terminal.

6 FIG. 12 is a diagram illustrating a case where the MOD network is decoded as a plurality of transmission source candidates smaller than the range of the radio wave of the reception terminal.

7 Fig. 12 is a diagram illustrating the embodiment through a transmission and reception port constituting the position information exchange system according to the present invention.

8th FIG. 12 is a diagram illustrating an embodiment of a communication code in the position information exchange system according to the present invention. FIG.

[Mode for Carrying Out the Invention]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. A position information exchange system according to the present invention is basically composed of a plurality of transmission and reception ports 1 with a transfer function (a) and a receive function (b) of position information as in 1 shown. This system can be put into practice as a system in which the position information on the transmitting side on a receiving side through a transmission port 1 (S) is shared, which contains only the transfer function (a), and by a receiving terminal 1 (R) which contains only the receiving function (b) but the system in which the position information is mutually transmitted through the transmitting and receiving ports 1 will be described in the following diagram.

In 1 is the transmission and reception terminal 1 essentially from a GPS receiving section 11 which forms locating means for obtaining its own position information as latitude and longitude data, a position information coding section 12 for converting the obtained longitude and latitude data into a position code, a wireless LAN transmission and reception section 13 which forms transmission means for transmitting its own position code via wireless communication, and receiving means for receiving the position codes of the others, a position information decoding section 14 which forms decoding means for decoding the longitude and latitude data from the obtained position codes of the others, and a display section 15 for displaying its own and other position information and the like.

These may be composed of exclusive transmission and reception ports, but may be put into practice as software that can be integrated into an existing transmission and reception port with a wireless LAN function and a GPS function such as a mobile telephone connection (so-called smartphone), a mobile PC port, an on-board communication machine (car navigation system) and the like is integrated and operated. In this case, the software elements integrated in the existing transmission and reception terminal are the position information coding section 12 and the position information decoding section 14 ,

The GPS reception section 11 receives a radio wave transmitted from a plurality of GPS satellites constituting a satellite positioning system, and obtains the current position information as the longitude and latitude data by calculating a distance of each of the satellites by multiplying a propagation velocity of the radio wave by the time difference between transmission and reception, and can use an A-GPS method using the position information of a base station as auxiliary information. As a GPS reception section 11 For example, the elements attached to the existing transmission and reception section as a 1-chip GPS module, which perform operations from receiving the radio wave to the position calculation, may be used.

The position information coding section 12 converts the longitude and latitude data provided by the GPS receive section 11 in a required minimum number of digits of the position code according to a coding algorithm which will be described later in detail, and gives the result to the wireless LAN transmission and reception section 13 out. On the other hand, the position information decoding section decodes 14 the longitude and latitude data of the transmission source from the position code, which is transmitted through the wireless LAN transmission and reception section 13 is obtained. The position information coding section 12 and the position information decoding section 14 are in the transmission and reception port 1 as a coding module installed on the operating system of the transmission and reception port 1 is working.

The wireless LAN transmission and reception section 13 is on the transmission and reception terminal 1 is mounted as a wireless LAN packet control module which performs the transmission and reception of data with other communication ports using the wireless communication, but in the position information exchange system of this embodiment, only the radio wave directing signal which is in transmission at a predetermined interval in the wireless communication is transmitted. In a frame format of wireless LAN, through IEEE802.11 is defined, this is composed of a physical header and a MAC frame and the MAC frame is composed of a IEEE802.11 header , Data and the FCS, and the IEEE802.11 header contains fields of the frame control, the addresses 1 to 3 and the like. In this embodiment, the routing signal is described in the frame controller, the location code of the transmission source is embedded in the addresses 1 to 3, and a routing packet is transmitted as a transmission address without specifying a destination.

Embedding the position code in an area indicating the physical address of the transmission source has logical integrity and is advantageous. However, if all the digits of the longitude and latitude data provided by the GPS receive section 11 are received, transmitted and received to ensure a solution which can be effectively used as the movable body position information, a bit length becomes large and can not be included in a range indicating the physical address of the wireless LAN. On the other hand, paths of a plurality of moving bodies in traffic are likely to cross each other within a certain time only when the positions with respect to each other are within a certain range determined by a moving speed around the corresponding present position of the moving body as the center and thus the range is not very different from the communicable range of near-distance wireless communication capable of transmitting the position information.

For example, the communicable area of the current wireless LAN is about 100 meters even if the conditions are satisfactory. Since the distance of 100 meters is a distance for which bicycles approaching at a speed of 20 km / h require about 9 seconds when facing each other to collide, it is sufficient as an area requiring positional information which are exchanged between the moving bodies as adopted by the present invention. Thus, the coding module according to the present invention uses an algorithm described below.

(Coding method in transmission) First, as in 4 represented, a map area, based on a global geodetic system or a local coordinate system, a network partition with certain area sizes Lo (longitude difference): La (latitude difference) subjected to a network 20 on the map 2 to put. For example, since a longitude difference corresponding to 500 meters in the vicinity of 35 degrees north latitude corresponds to 20 seconds, a length Lo in the longitude direction and a length La in the latitudinal direction corresponding to 20 seconds are calculated, and longitude lines 31 . 32 . 33 ... at 20-second intervals and latitude lines 21 . 22 . 23 ... at 20-second intervals are on the map 2 set. The network 20 that of a network split by each of the longitude lines 31 . 32 . 33 ... and the latitude lines 21 . 22 . 23 ... is subjected to a network with 20 seconds as Partial remainder and is sometimes referred to as a "MOD network".

Hereinafter, the longitude and latitude differences (x, y) are based on an origin 10 in the network 20 in which the transmission and reception connection 3 after dividing the latitude and longitude (X, Y: longitude and latitude data passing through the transmission and reception section 3 obtained) of the own position by the length Lo in the direction of longitude and the length La in the latitudinal direction of the network 20 calculated as a remainder. x = min (X - aLo)> 0 (1a) y = min (Y-bLa)> 0 (1b) (where a and b are integers)

Subsequently, a data length adjustment coefficient B (constant) is multiplied by the longitude and latitude differences (x, y), and the result is converted into a longitude and latitude code (α, β). The data length adjustment coefficient B is preferably such a large decimal number included in the data length limited by the system when the longitude and latitude codes (α, β) are binary-coded, and if the data length is 11 bits, it is "2048" and when the data length is 10 bits, it is "1024", for example. α = rounded (B x / Lo) (2a) β = rounded (B x y / La) (2b)

With regard to the longitude and latitude indices (α, β) calculated as above, since the longitude and latitude differences (x, y) used as the basis are values considerably smaller than the longitude and latitude ( x, y), which can unambiguously represent the position on the globe, the data length can be kept small even if the resolution required for the detection accuracy is ensured. Assuming that the lengths in the longitude direction and the latitude direction of the network are angles corresponding to 500 meters, and the data length is 11 bits, for example, the longitude and latitude code "1" corresponds to 24 cm and as a result of the aforementioned calculation, a difference between the calculated value and the presently measured value 12 cm at the maximum, which can be considered in practice as a sufficient determination accuracy of the position information exchange system.

As described above, the longitude and latitude codes (α, β) generated by the coding module (position information coding section 12 ) are embedded as position codes on the transmission source in the radio-wave directing signal, and are transmitted through the wireless LAN transmission and reception section 13 the transmission and reception terminal 1 (S) sent as in 1 (a) shown. Between the position information coding section 12 and the wireless LAN transmission and reception section 13 may be a radio wave guidance signal generating section 13 for generating a radio wave directing signal exclusive to the position information exchange system separately from the radio wave directing signal for establishing the data communication of the transmission and reception terminal 1 be provided.

If, on the other hand, as in 1 (b) shown, the wireless LAN transmission and reception section 13 the transmission and reception terminal 1 (R) receives the radio wave direct signal in which the position code of another transmission source is embedded, the longitude and latitude data (x, y) of the transmission source in the coding module (position information decoding section 14 ) is decoded by the following procedure.

(Receiving Decoding Method) First, the binary-coded longitude and latitude codes (α, β) are decimal coded, and then the longitude and latitude differences (x, y) of the transmission source are divided by the data length adjustment coefficients B and the result multiplied by the length Lo in the longitude direction and the length La in the latitudinal direction of the network 20 decoded. x = (α / B) Lo (3a) y = (β / B) La (3b)

The following are assuming that the transmission source is in the same network 20 as the transmission and reception terminal 1 (R) itself (on the receiving side), or in networks adjacent thereto, adds the obtained longitude and latitude differences (x, y) to the longitude and latitude (X0i, Y0i) of the origin of each network, and the longitude and latitude data (Xi , Yj) from each transmission source candidate point are calculated. (4a) = Xi = X0i + x (4b) = Yj = Y0j + y (where i = -1, 0, 1, j = -1, 0, 1)

Subsequently, a distance D (i, j) from the own longitude and latitude data (X, Y) to the longitude and latitude data (Xi, Yj) of each of the transmission source candidate points is obtained by the following equation (5a), and the candidate point, which satisfies the following equation (5b) in the obtained distance D (i, j) is determined as the transmission source. D (i, j) = √ {(X-Xi) ^ 2 + (Y-Yj) ^ 2} (5a) r> D (i, j) (5b) (where i = -1, 0, 1, j = -1, 0, 1, r is a radio wave range)

As in 5 4, the transmission source candidate point calculated by the received longitude and latitude codes (α, β) is present in each of the nine networks, including the network 20 the transmission and reception terminal 4 but below these is the candidate point within the radio wave range 40 (a circle with a radio wave range distance r as radius) of the wireless LAN, the transmission source (transmission and reception port 3 ), and the decoding is completed by selecting the applicable longitude and latitude data (Xi, Yi).

In the in 5 As shown, the network size is based on the radio wave range 40 set, and the length Lo in the longitudinal direction and the length La in the latitudinal direction of the network 20 are twice as large (or larger) than the radio wave range r, and thus the transmission source is uniquely determined. The same is true even if a transmission source is in an area where the radio wave range is 40 into an adjacent network on the left side in the figure from the network 20 protrudes.

On the other hand, if the mesh size is smaller than twice the size of the radio wave range r, it means that a plurality of transmission source candidate points in a radio wave range 40 ' is present, as in 6 and the transmission source can not be determined uniquely. Even in this case, however, by measuring the radio wave intensity of the received radio wave guidance signal, it can be estimated whether it is the radio wave guidance signal output from the transmission source candidate point (FIG. 3 ) is transmitted at a near range when the radio wave intensity is strong.

On the other hand, when the radio wave intensity is weak, it can be estimated that it is the radio wave directing signals which are transmitted from the transmission source candidate points (FIG. 3 ' ..) with relatively large distances, but as in the example in 6 For example, in a situation where a plurality of the transmission source candidate points are detected at relatively far positions, the candidate points from which the radio wave is transmitted can not be directly determined. However, the need to determine the position of the transmission source candidate point at a long distance and the fact to draw attention to it are considered to be low in the communication between vehicles and the communication between pedestrian and vehicle on which the present invention substantially addresses.

 (Relationship between network size and radio wave range)

The radio wave range r related to the determination of the mesh size (Lo, La) can be obtained from a function of the radio wave range to a coefficient indicating a state of propagation environment. As a propagation model of the frequency used in the wireless LAN, a "cost-extended hata model" is known. A case where the radio wave range r of the current position is obtained according to this model will be described below.

According to this model, the range of the radio wave is defined as a function of a propagation coefficient n (2.0 ≤ n ≤ 4.0). The propagation coefficient n is a coefficient indicating a disturbance degree of a propagation space, and a value of n and the current radio wave propagation environment are related to each other as follows:
n: 2.0 (vacuum without obstacle) to 4.0 (many obstacles that shield the radio wave)

If n = 2.0 it has a ratio of r = 100 m, and if n = 4.0 r = 10 m, and if n takes a value between 2.0 and 4.0, the range r of the radio wave from a Function relation can be obtained substantially from an inverse relationship to the propagation coefficient n.

For example, an area on a map is divided into a "city area (center area)", "city area (periphery)", "suburb", and "mountainous area", and values are assigned according to the area in which the transmission and reception terminal is located , as the city area (center area): r = 10 m (corresponding to n = 4.0), the city area (border area): r = 40 m, suburb: r = 75 m and the mountainous area: r = 100 m (according to to n = 2.0), and by setting the mesh size (Lo, La) to twice the size or larger as the radio wave range r, the position of the transmission source can be uniquely determined.

These are the values when using a 2.4GHz band and when the 5GHz band is used r = 50m when n = 2.0 r = 6m when n = 4 r = 0, and in the middle of these, the radio wave range r can be obtained by applying the function relation substantially in inverse proportion to the propagation coefficient r, similarly to the above. In addition, the propagation model is not limited to this model, but other models for which a relationship between the number of obstacles and the propagation distance is defined as the function relation may also be used.

By considering the nature of the propagation coefficient n as described above, the mesh size (Lo, La) can be set according to the surroundings of the city area, the suburb and the mountainous area with different radio wave ranges r. For example, as in 8th illustrated, be designed so that as the mesh size (Lo, La) characteristic numbers (size indices), which determine four stages, that is 00: L = 25 m, 01: L = 50 m, 10: L = 120 m, 11: L = 250 m, and this size index is embedded in the routing signal data packet with the location code and transmitted to the transmission side, while the reception side decodes the location code having the network size (Lo, La) which determines the size index.

In addition, the radio wave range r may also be selected based on a correlation of a number of detected GPS satellites and the number of propagation modes. For example, in an environment where the sky is clear, the number of GPS satellites that can be detected is large, while in an environment with many obstacles, the number of GPS satellites that can be detected is small, and thus, when the number of detected GPS satellites is large, it is determined that it is the "suburb", while when the number of detected GPS satellites is small, it is determined that it is the "urban area "And the radio wave range r can be switched.

In a region of low or medium latitude, a network divided into a small area may be approximated to a regular square on one level, and thus La = Lo may be but in a high latitude region such as a polar region, the length La in the latitudinal direction does not coincide with the length Lo in the long-term direction because the mesh can not be approximated by a regular square. In this case, in order to uniquely specify the transmission source, the distance during decoding must be corrected.

In addition, the case where the wireless LAN is through IEEE802.11 is described as wireless communication means but Bluetooth defined by IEEE802.15 , and other short-range wireless communication means transmitting and receiving a routing signal may also be used.

Hereinafter, processing in the transmission and reception of the position information exchange system according to the present invention will be described with reference to FIGS 1 to 3 described.

 (Position information transmission on the transmission side)

If, as in 1 (a) represented, the transmission and reception terminal 1 as the transfer port S of the position information exchange system, as in the flowchart in FIG 2 is shown, the own position (longitude and latitude data X, Y) by the GPS receiving section 11 (GPS module) (step 111 ), and the obtained longitude and latitude data X, Y become the position information coding section 12 (Coding module) and the display section 15 (HMI module) (step 112 ).

The display section 15 (HMI module) reads its current position (longitude and latitude data X, Y) received from the GPS receiving section 11 (GPS module), and put them on the map 2 on a display screen, as in Figs 4 to 6 (Steps 151 . 152 ).

The position information coding section 12 (Coding module) reads its current position (longitude and latitude data X, Y) received from the GPS receiving section 11 (GPS module), and when the size index (00 to 11) is determined based on the radio wave range r and the propagation coefficient n, the mesh size (Lo, La) and the radius r are initialized according to the specified size index (steps 121 . 122 ).

Subsequently, using the aforementioned equations (1a, 1b), a net origin coordinate and longitude and latitude differences (x, y) of the own position based on the net origin from the own obtained longitude and latitude data X, Y are calculated (step 123 ), and moreover, by means of the aforementioned equations (2a, 2b) in the Longitude and latitude codes (α, β) of the own position are converted (step 124 ), binary coded and to the wireless LAN transmission and reception section 13 (Wireless LAN Packet Control Module) (step 125 ).

The wireless LAN transmission and reception section 13 (Wireless LAN packet control module) reads the longitude and latitude code (α, β), generates a routing packet in which the longitude and latitude codes (α, β) are embedded, and transmits its current position information as the radio wave command signal (steps 132 . 133 ). Thereafter, the wireless LAN packet control module is initialized and ready for the subsequent transmission (step 131 ).

 (Receiving the transmission source position information on the receiving side)

As in 1 (b) is shown, even if the transmission and reception terminal 1 as the receiving terminal R of the position information exchange system, as in the flowchart in FIG 3 shown, similar to the transmission, its own position (longitude and latitude data X, Y) obtained by the GPS receiving section (GPS module) and to the position information decoding section 14 (Coding module) and the display section 15 (HMI module) (step 211 and 212 ).

The display section 15 (HMI module) shows its own position on the map 2 the display screen (steps 251 and 252 ), and the position information decoding section 14 (Encoding module) initializes each variable based on its own position information (steps 241 . 242 ).

In this state, when the wireless LAN transmission and reception section 13 (Wireless LAN packet control module) receives the radio wave direct signal sent from another transmission port, the position codes (latitude and longitude code (α, β)) of the transmission source are extracted from the radio wave direct signal and sent to the position information decoding section 14 (Coding Module) (Step 233 ).

The position information decoding section 14 (Coding module) decodes the longitude and latitude differences (X, Y) from the longitude and latitude codes (α, β) of the transmission source from the aforementioned equations (3a, 3b) (step 243 ) assuming that the transmission source in the same network 20 , or in the network adjacent thereto, as the transmission and reception port 1 (R) its own (receiving side), and calculates the longitude and latitude data (Xi, Yj) of the transmission source candidate points in the nine networks by the aforementioned equations (4a, 4b) (step 244 ).

Subsequently, the distance D (i, j) from its own longitude and latitude data (X, Y) obtained at step 241 to the longitude and latitude data (Xi, Yj) of each of the transmission source candidate points obtained by the aforementioned equation (5a) (step 245 ), and the candidate point having the obtained distance D (i, j) smaller than the radio wave range r is taken as the transmission source (step 246 ), and the longitude and latitude data (Xi, Yj) of the transmission source become the display section 15 (HMI module) (step 247 ).

The display section 15 (HMI module) shows its own longitude and latitude data (X, Y) along with longitude and latitude data (Xi, Yj) on the transmission source on the card 2 on the display screen, as in 5 shown (step 253 ). An approximation of the transmission source may be indicated to a user by a voice or text message.

(Exchange of Position Information Through Two Transmission and Reception Ports) The following is an example of the exchange of the position information by two units of the transmission and reception ports 3 and 4 , which execute the position information exchange system according to the present invention, with reference to FIG 7 described.

7 schematically shows the transmission and reception terminal 3 (a mobile telephone line), which is held by a pedestrian who is at an intersection of a side street and the transmission and reception terminal 4 approaching (a mobile telephone line or an on-board communication machine) mounted on an automobile approaching towards the intersection. The transmission and reception connection 3 of the pedestrian transmits the radio wave guidance signal in which the position codes (α ₃ , β ₃ ) corresponding to the longitude and latitude data (X ₃ , Y ₃ ) are embedded, and the transmission and reception ports 4 of the automobile transmits the radio wave directing signal in which the position codes (α ₄ , β ₄ ) corresponding to the longitude and latitude (X ₄ , Y ₄ ) are embedded.

If the transmission and reception connection 3 of the pedestrian into the radio wave range 40 of transmission and receiving terminal 4 of the automobile enters, and if the transmission and reception terminal 4 of the automobile also in the radio wave range 30 the transmission and reception terminal 3 of the pedestrian, the position information (X ₃ , Y ₃ ) of the transmission and reception terminal becomes 3 the transmission and reception connection 4 of the automobile, while the position information (X ₄ , Y ₄ ) of the transmission and reception port 4 are transmitted to the transmission and reception terminal of the pedestrian, and the transmission source is displayed on the respective connection screens, and an alarm indicating the approach is issued, so that attention is given to each other.

In this case the two transmit and receive ports 3 and 4 the method for establishing a communication does not pass through a base station or the like, but they receive only the radio wave directing signal that is constantly sent to establish the communication, and the position information embedded therein are shared on both sides on a common coordinate system, which origin 10 and the network 20 is specified. However, a type of the terminal can be determined from the address information and the transmission source.

The above example may be regarded as the communication between a pedestrian and a vehicle, but it may also be used for communication between vehicles and the mutual exchange of position information between the pedestrians. Even more, in case one of them is not a moving body, it may be for an application of exchanging the position information of the transmission terminal of a movable body from a fixed point or for an application of exchanging the position information of a fixed point by the terminal of the mobile body In this case, the fixed transmission source need only transmit the position codes (α, β) as a fixed value instead of dynamic position information by location means such as a GPS, and it may be used in various modes such as recording, output, tracking, entry and exit detection, flow rate analysis, and the like of persons or objects in addition to assisting safe driving or preventing traffic accidents by collision risk detection.

The embodiment of the present invention has been described above, but the present invention is not limited to the aforementioned embodiment, but other various modifications and changes can be made on the basis of the technical idea of the present invention.

LIST OF REFERENCE NUMBERS

1

Transmission and reception connection

2

map

3, p

Transmission connection (transmission and reception connection)

4, R

Reception connection (transmission and reception connection)

10

origin

11

GPS reception section (geodetic, GPS module)

12

Position information coding section (coding module)

13

Wireless LAN transmission and reception section (wireless LAN data packet control module)

14

Position information decoding section (coding module)

15

Display section (HMI module)

20, 20 '

 Network (MOD network)

30, 40, 40 '

 Radio wave range

21, 22, 23

 Latitude line

31, 32, 33

 Longitude line

111

Get your own position

112

Give up your own position

121

Read your own position from the GPS

122

Initialize each variable

123

Set mod of the network, calculate longitude and latitude difference

124

Change longitude and latitude difference into key figures

125

Output the longitude and latitude codes to wireless LAN section

131

Initialize

132

Read longitude and latitude codes

133

Generate pilot signal data packet

151

Read your own position from the GPS

152

Show your own position on map

211

Get your own position

212

Give up your own position

231

Initialize

232

Receive master signal data packet

233

Extract and output transmission source address

241

Initialize each variable

243

Change the received key figure to longitude and latitude difference

244

Calculate transmission source candidate points

245

Select candidate points

246

Is the transmission source approaching?

247

Output transmission source coordinate to HMI

251

Read your own position from the GPS

252

Show your own position on map

253

Show your own transfer source location on map

B

Data length adjustment coefficient

Lo

Length in longitude direction

La

Length in latitude direction

n

spreading coefficient

r, r '

Radio wave range

X

degree of longitude

Y

degree of latitude

x

Longitude difference

y

Latitude difference

α

Longitude indicator (position code)

β

Latitude Code (Position Code)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• IEEE802.11 [0038]
• IEEE802.11 header [0038]
• IEEE802.11 header [0038]
• IEEE802.11 [0062]
• IEEE802.15 [0062]

Claims (11)

A position information exchange system having at least one transmission terminal and at least one reception terminal in which at least one of the transmission terminal and the reception terminal is mounted on a movable body or held thereby, and position information of the transmission terminal is shared by the reception terminal, characterized in that the transmission terminal has location means for Obtaining its own position information as longitude and latitude data, coding means for converting the longitude and latitude data into positional codes corresponding to longitude and latitude differences from an origin in a network by dividing a map area based on a geodetic system into a network of a predetermined size , and transmission means for transmitting the position code via the wireless data communication; and the receiving terminal comprises receiving means for receiving the position codes and decoding means for decoding the longitude and latitude data in the network on which the receiving terminal is located, or adjacent thereto, networks. A position information exchange system according to claim 1, wherein said coding means comprises calculating means for converting a remainder obtained by dividing the longitude and latitude data by lengths in a length direction and in a width direction of the network into position codes as the longitude and latitude differences, and the decoding means calculating means for calculating the longitude and latitude data of the transmission terminal by multiplying the lengths in the length direction and the width direction of the network by the position codes. A position information exchange system according to claim 1 or 2, wherein at least one of the transmission terminal and the reception terminal is a transmission and reception terminal including the location means, the coding means, the transmission means, the reception means and the decoding means. The position information exchange system according to any one of claims 1 to 3, wherein the reception terminal or the transmission and reception terminal further comprises means for calculating a distance from its own position obtained as longitude and latitude data to a position of the transmission terminal detected by the decoding means as a longitude and latitude data is decoded. The position information exchange system according to any one of claims 1 to 4, wherein the size of the network division is selected such that the length in the latitudinal direction and the length in the long-term direction of the network becomes twice or greater than the radio-wave range of the wireless data communication. A position information exchange system according to any one of claims 1 to 5, wherein the wireless data communication is a wireless LAN. A position information exchange system according to any one of claims 1 to 6, wherein the transmission means is capable of generating a radio wave guidance signal having the position code, and capable of transmitting the radio wave guidance signal via the wireless data communication, and the receiving means is capable of receiving the radio wave guidance signal. A position information exchange system according to any one of claims 1 to 7, wherein said encoding means is capable of selecting a network partition size of said network, and said transmitting means is capable of transmitting a division size index selected by said coding means in addition to said position code, and said decoding means is configured to decode the longitude and latitude data of the transmission port from the position code based on the division size metric. A transmission terminal used in the position information exchange system according to any one of claims 1 to 8, wherein the transmission terminal comprises the location means, the coding means and the transmission means. A receiving terminal used in the position information exchange system according to any one of claims 1 to 8, wherein the receiving terminal comprises the locating means, receiving means and decoding means. A transmission and reception terminal used in the position information exchange system according to any one of claims 1 to 8, wherein the transmission and reception terminal comprises the location means, the coding means, the reception means and the decoding means.

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