JPWO2018051648A1 - Communication system, transmission apparatus, reception apparatus, control method of transmission apparatus, control method of reception apparatus, and program - Google Patents

Abstract

In a communication system for acquiring position information, the amount of communication is reduced. The communication system comprises a transmitter and a receiver. In this communication system, a transmitter transmits relative position information indicating a relative position from a predetermined reference point. In addition, in the communication system, the reception device stores predetermined registration position information in advance. Then, when the relative position information transmitted by the transmission device is received, the reception device estimates the position information from the relative position information and the registered position information.

Description

  The present technology relates to a communication system, a transmitting device, a receiving device, processing methods in these, and a program for causing a computer to execute the method. More particularly, the present invention relates to a communication system for acquiring position information, a transmitter, a receiver, a processing method thereof, and a program for causing a computer to execute the method.

  Conventionally, a Global Navigation Satellite System (GNSS) is known as a system for receiving radio waves from a plurality of satellites and determining the position of a receiver. The positioning data acquired by the GNSS receiver includes various information such as positioning time and altitude, as well as position information such as longitude and latitude. In a system in which a receiver wirelessly transmits its positioning data to another wireless device, a configuration is proposed in which only information necessary for the wireless device is selected and transmitted in order to reduce the amount of communication (for example, Patent Literature 1)). For example, if the radio requires the latitude and longitude and the positioning time, but the altitude is not necessary, the remaining information excluding the altitude is transmitted.

JP, 2006-129128, A

  In the prior art described above, the radio can obtain the position of the receiver by transmitting the longitude and latitude to the radio. However, there is a problem that the amount of communication in the system increases as the transmission frequency of longitude and latitude increases. In particular, when the receiver or radio operates with a battery, power consumption increases with an increase in the amount of communication, and measures are required.

  The present technology has been created in view of such a situation, and aims to reduce the amount of communication in a communication system that acquires location information.

  The present technology has been made to solve the above-mentioned problems, and a first aspect of the present invention is a transmitting device for acquiring and transmitting relative position information indicating a relative position from a predetermined reference point, and The present invention is a communication system including: a registration device for storing registration position information in advance; and receiving the relative position information to estimate the position information from the relative position information and the registration position information. This brings about the effect | action that position information is estimated from the transmitted relative position information and registration position information.

  In the first aspect, the transmitting device acquires the relative position information from position information including area position information indicating the position of the measured area and the relative position information, and the registered position information is It may be position information indicating the position of a specific area. This brings about the effect | action that position information is estimated from relative position information and the registration position information which shows the position of a specific area | region.

  Further, in the first aspect, one of the transmitting device and the receiving device performs a predetermined operation for calculating position information of the transmitting device when the transmitting device exceeds the boundary of the specific area. May be performed. This brings about the effect | action that position information is calculated by execution of calculation.

  In the first aspect, a predetermined buffer area is set in the vicinity of the boundary, and one of the transmitting apparatus and the receiving apparatus transmits the transmission based on the predetermined buffer area and the relative position information. It may be determined whether the device has crossed the boundary. This brings about the effect that it is judged based on the buffer area and relative position information whether or not the transmitter has crossed the boundary.

  In addition, in the first aspect, the registered position information includes the longitude of the specific area, and one of the transmitting device and the receiving device determines that the transmitting device exceeds the zero degree meridian and 180 degrees. The direction of the longitude may be reversed in the case of exceeding the meridian of. This brings about the effect that the direction of the longitude is reversed when the transmitter crosses the meridian.

  In the first aspect, the registered position information includes the latitude of the specific area, and one of the transmitting device and the receiving device indicates the azimuth of the latitude when the transmitting device exceeds the equator. May be reversed. This brings about the effect that the azimuth of the latitude is reversed when the transmitter goes over the equator.

  Further, in the first aspect, the registered position information is information indicating the position of the predetermined reference point, and the transmitting device stores the registered position information in advance and acquires position information. The difference between the position information and the registered position information may be transmitted as the relative position information. This brings about the effect | action that the difference of positional information and registration positional information is transmitted as relative positional information.

  In the first aspect, the receiving device may display the position of the transmitting device indicated by the position information on a display unit. This brings about the effect | action that the position of a transmitter is displayed.

  In the first aspect, the position information indicates measured values of degrees, minutes, and seconds of latitude and longitude, and the relative position information includes measured values of the minutes and seconds of the degrees, minutes, and seconds. May be indicated. This has the effect of transmitting relative position information indicative of measured minutes and seconds.

  In the first aspect, the position information indicates a millisecond measurement value of latitude and longitude, and the relative position information indicates a lower digit of the upper digit and the lower digit of the measurement value. It is also good. This brings about the effect | action that relative positional information which shows the measured value of a low-order digit is transmitted.

  In addition, a second aspect of the present technology is a transmission device including a position information acquisition unit that acquires relative position information indicating a relative position from a predetermined reference point, and a transmission unit that transmits the relative position information, The control method is a program for causing a computer to execute the method. This brings about the effect | action that relative position information is transmitted among position information.

  Further, according to a third aspect of the present technology, there is provided a storage unit that stores predetermined registration position information, a reception unit that receives relative position information indicating a relative position from a predetermined reference point, the relative position information, and the registration. It is a receiving device provided with the estimation part which estimates position information from position information, the control method, and the program for making a computer perform the said method. This brings about the effect that position information is presumed from relative position information and registration position information.

  According to the present technology, in the communication system that acquires position information, the excellent effect of being able to reduce the amount of communication can be achieved. In addition, the effect described here is not necessarily limited, and may be any effect described in the present disclosure.

FIG. 1 is an overall view showing a configuration example of a communication system in a first embodiment of the present technology. It is a block diagram showing an example of 1 composition of a positioning terminal in a 1st embodiment of this art. It is a figure showing an example of a format of positioning information in a 1st embodiment of this art. It is a figure showing an example of positioning information in a 1st embodiment of this art. It is a figure showing an example of data structure of position information in a 1st embodiment of this art. It is a figure showing an example of a field which field position information shows in a 1st embodiment of this art, and a relative position which relative position information shows. It is a block diagram showing an example of 1 composition of a user terminal in a 1st embodiment of this art. It is a figure for explaining data processing in a 1st embodiment of this art. It is a flow chart which shows an example of transmission processing in a 1st embodiment of this art. It is a flow chart which shows an example of reception processing in a 1st embodiment of this art. It is a figure for explaining registration position information and a guard band in a 2nd embodiment of this art. It is a figure for explaining calculation of longitude in a 2nd embodiment of this art. It is a figure for explaining the processing at the time of crossing the 0-degree meridian and the equator in a 2nd embodiment of this art. It is a flow chart which shows an example of reception processing in a 2nd embodiment of this art. It is a flow chart which shows an example of registration position information operation processing in a 2nd embodiment of this art. It is a flow chart which shows an example of latitude operation processing in a 2nd embodiment of this art. It is a flow chart which shows an example of the longitude operation processing in a 2nd embodiment of this art. It is a figure which shows an example of a data structure of the calculation information transmitted when it judges whether the positioning terminal 110 in the 2nd Embodiment of this technique passed the boundary. It is a block diagram showing an example of 1 composition of a positioning terminal in the 1st modification of this art. It is a figure for explaining difference operation in the 1st modification of this art. It is a figure for explaining data processing in the 1st modification of this art. It is a flow chart which shows an example of transmission processing in the 1st modification of this art. It is a flow chart which shows an example of reception processing in the 1st modification of this art. It is a figure showing the movement course which straddles the 180-degree meridian and the equator in the 2nd modification of this art.

Hereinafter, modes for implementing the present technology (hereinafter, referred to as embodiments) will be described. The description will be made in the following order.
1. First embodiment (example of transmitting only relative position information)
2. Second embodiment (example of transmitting only relative position information and determining whether or not the area is exceeded)

<1. First embodiment>
[Configuration example of communication system]
FIG. 1 is an overall view showing a configuration example of a communication system 100 in the first embodiment of the present technology. This communication system comprises a positioning terminal 110 and a user terminal 120. This communication system is used, for example, for watching a child, an old man, a pet, etc. by a guardian, a carer or an owner.

  The positioning terminal 110 measures the position of the positioning terminal 110 itself. As the positioning terminal 110, for example, a mobile device such as a GPS (Global Positioning System) receiver compact enough to operate with a button battery is assumed. Positioning terminal 110 receives radio waves from a plurality of GNSS satellites 500, and generates positioning information based on the radio waves. Then, the positioning terminal 110 wirelessly transmits part of the positioning information to the user terminal 120 via the base station 510. Details of the information to be transmitted will be described later. Alternatively, the positioning terminal 110 directly transmits part of the positioning information to the user terminal 120 without going through the base station 510. The positioning terminal 110 is an example of a transmission device described in the claims. In addition to the GPS receiver, a smartphone, a tablet terminal, a notebook personal computer, or the like may be used as the positioning terminal 110.

  The user terminal 120 displays the position of the positioning terminal 110. As the user terminal 120, for example, a mobile device such as a smartphone, a tablet terminal, or a notebook personal computer is assumed. The user terminal 120 displays the position of the positioning terminal 110 based on the information received from the positioning terminal 110. For example, the user terminal 120 displays a map, and displays a predetermined mark indicating the position of the positioning terminal 110 on the map.

  The positioning terminal 110 is carried by a child or the like, and the user terminal 120 is carried by a guardian or the like. By the user terminal 120 displaying the position of the positioning terminal 110, a guardian or the like can grasp the current location of a child or the like. Since these positioning terminals 110 and user terminals 120 normally operate with a battery, reduction of the amount of communication is required from the viewpoint of reducing power consumption.

  Although one positioning terminal 110 and one user terminal 120 are provided in the communication system 100, the present invention is not limited to this configuration. When watching a plurality of children and the like, a plurality of positioning terminals 110 may be provided, and when a plurality of adults and the like want to confirm the position, a plurality of user terminals 120 may be provided. In this case, the correspondence between the transmitting side and the receiving side is not limited to one to one. For example, when one guardian or the like watches a plurality of children or the like, one user terminal 120 is associated with the plurality of positioning terminals 110, and the positioning terminals 110 are relative position information to the user terminals 120 Send Also, one positioning terminal 110 may transmit relative position information to a plurality of user terminals 120.

[Configuration Example of Positioning Terminal]
FIG. 2 is a block diagram showing one configuration example of the positioning terminal 110 in the first embodiment of the present technology. The positioning terminal 110 includes a control unit 111, a GNSS receiving unit 112, a data processing unit 113, and a transmitting unit 114.

  The control unit 111 controls the entire positioning terminal 110. For example, the control unit 111 controls the GNSS receiving unit 112, the data processing unit 113, and the transmitting unit 114 to start operations at predetermined time intervals or when a predetermined operation is performed by the user.

  The GNSS receiver 112 receives radio waves from GNSS satellites. The GNSS reception unit 112 supplies the data processing unit 113 with the reception information superimposed on the received radio wave. This reception information includes, for example, the three-dimensional coordinates of the GNSS satellite and the transmission time.

  The data processing unit 113 processes the received information to measure the position of the positioning terminal 110. The data processing unit 113 obtains three-dimensional coordinates of the positioning terminal 110 from the three-dimensional coordinates of each of the plurality of GNSS satellites and the transmission time. Then, the data processing unit 113 converts the obtained three-dimensional coordinates into position information including latitude and longitude, and generates positioning information including the position information and the reception time. Then, the data processing unit 113 extracts a part of the positioning information and supplies it to the transmission unit 114. The data processing unit 113 is an example of a position information acquisition unit described in the claims.

  The transmission unit 114 wirelessly transmits the information extracted by the data processing unit 113 to the user terminal 120.

  FIG. 3 is a diagram illustrating an example of a format of positioning information in the first embodiment of the present technology. When using the standard of NMEA (National Marine Electronics Association) 0183, "$" which is the start character of the message is transmitted first. Next, a talker ID (IDentifier) identifying the caller is transmitted. In the case of a GPS module, “GP” is set in the talker ID, and in the case of a Global Navigation Satellite System (GLONASS) module, “GL” is set. The type of message is then sent. Here, since the CGA message is exemplified, “CGA” is set as the message type.

  Then, the positioning time is transmitted in Universal Time, Coordinated (UTC) format. Next, the latitude is sent. Latitude is expressed in degrees, minutes and seconds. For example, in the case of 36 degrees 45 minutes 53 seconds, "3645.5300" is transmitted as the latitude. The azimuth of the latitude is then transmitted. If the heading is north then 'N' will be sent, if south then 'S' will be sent.

  The longitude is then sent. Longitude is expressed in degrees, minutes and seconds. For example, if it is 137 degrees 9 minutes 52.26 seconds, "13709.5226" is transmitted as the latitude. The longitude orientation is then transmitted. If the heading is east, "E" is sent, if west, "W" is sent.

  The geographical position of the positioning terminal 110 is specified by the latitude, the azimuth of the latitude, the longitude, and the azimuth of the longitude described above. Information consisting of these latitudes, longitudes, and their directions is hereinafter referred to as "position information". The location information is not all transmitted to the user terminal 120, but only a part. Information (such as positioning time) other than the position information is transmitted as appropriate.

  Subsequently, the method of positioning is transmitted. In the case of single positioning, “1” is transmitted, and in the case of differential positioning, “2” is transmitted. Then, the number of satellites used, the horizontal accuracy index, the height of the antenna, and the unit of the height are transmitted in order. Then, the number of seconds from when the correction data is sent until it is used is sent. Next, the ID (IDentifier) of the correction data transmitting station is transmitted, and finally the checksum is transmitted.

  In addition, although the positioning terminal 110 is producing | generating the positioning information of the specification of NMEA0183, you may produce | generate the positioning information of another specification.

  FIG. 4 is a diagram illustrating an example of positioning information in the first embodiment of the present technology. The positioning information includes, in order of transmission, a start character, talker ID, message type, time, and position information.

  FIG. 5 is a diagram illustrating an example of a data structure of position information according to the first embodiment of the present technology. "A" in the figure is an arrangement of items included in the position information in the order of transmission. The position information includes, in order of transmission, the latitude, the azimuth of the latitude, the longitude, and the azimuth of the longitude. Here, latitude and longitude are expressed in degrees, minutes and seconds, with degrees listed first, then minutes and seconds.

  Here, assuming that the value of "degree" of latitude is x (x is an integer) and the value of "degree" of longitude is y (y is an integer), the value and azimuth of each "degree" of latitude and longitude and Indicates a rectangular area surrounded by x and x + 1 latitude lines and y and y + 1 longitude lines. Therefore, the information which shows each "degree" and latitude of latitude and longitude is hereafter called "the area | region position information."

  In addition, the "minutes" and "seconds" values of latitude and longitude are the relative positions from the reference point where "minutes" and "seconds" are both "0" in the area indicated by the area position information. Indicates Therefore, information indicating “minute” and “second” of latitude and longitude, respectively, is hereinafter referred to as “relative position information”.

  As described above, the position information includes area position information and relative position information. Therefore, as shown by b in FIG. 5, the data structure of the position information can be represented.

  FIG. 6 is a diagram illustrating an example of a region indicated by region position information and a relative position indicated by relative position information according to the first embodiment of the present technology. The earth's ground plane is divided into regions by latitude and longitude lines in units of degrees. Since one degree of latitude and longitude can be converted to about 111 kilometers (km), each of the divided regions is a rectangular region of about 111 kilometers (km) square. Position information indicating a specific area among these areas is registered in advance in the user terminal 120 as registration position information. The specific area to be registered is hereinafter referred to as a "registration area". In addition, since the ground surface is a spherical surface, latitude and longitude lines are not straight lines but strictly curved lines, but in the figure, latitude lines and longitude lines are represented by straight lines for convenience of description.

  Here, the latitude is from 0 degrees to 90 degrees, and the longitude is from 0 degrees to 180 degrees. Therefore, the "degree" of latitude can be represented by 7 bits or more, and the "degree" of longitude can be represented by 8 bits or more. When the "degree" of latitude is represented by 7 bits, the upper 7 bits of the bit string of latitude information correspond to the area position information, and the remaining lower bits correspond to the relative position information.

  For example, it is assumed that the position information indicates coordinates of 35 degrees 44 minutes 77.249 seconds north, and 139 degrees 23 minutes 23 minutes 38.761 seconds east. Of the position information, the upper bit string indicating 35 degrees north latitude and 139 degrees east longitude corresponds to the area position information, and the lower position indicating the coordinates of the latitude of 44 minutes and 77.249 seconds and the longitude of 23 minutes and 38.761 seconds. The bit string of corresponds to relative position information. This area position information is a latitude ranging from 35 degrees 00 minutes 00 seconds north to 36 degrees 00 minutes 00 seconds north latitude, and a range from 139 degrees 00 minutes 00 seconds east to 140 degrees 00 minutes 00 seconds east longitude Indicates the area A1 specified by the longitude of

  Further, the relative position information is that the latitude from the reference point 521 of north latitude 35 degrees 00 minutes 00 seconds and east longitude 139 degrees 00 minutes 00 seconds in the region A1 is 44 minutes 77.249 seconds, and the longitude from the reference point 521 Indicates a coordinate 522 of 23 minutes and 38.761 seconds.

  Further, it is assumed that a child or the like carrying the positioning terminal 110 lives in the area A1 and does not go out of the area. In this case, area position information indicating the area A1 is registered in advance as registered position information in the device on the reception side (user terminal 120), and the device (positioning terminal 110) on the transmission side is only relative position information among the position information. Send If the positioning terminal 110 does not go out of the area A1, the receiving side can estimate the position information acquired by the transmitting side from the registered position information indicating the area A1 and the received relative position information.

  By transmitting only relative position information among the position information in this manner, the amount of communication can be reduced as compared with the case where the entire position information is transmitted. In addition, since the positioning terminal 110 and the user terminal 120 normally operate with a battery, power consumption can be saved and the operation time can be extended by reducing the amount of communication. In addition, since the time required for reception can be shortened when the amount of communication is small, the time from when the user terminal 120 starts reception until the position of the positioning terminal 110 is displayed can be shortened.

  Although the communication system 100 divides the ground surface into a plurality of areas by the longitude line and the latitude line of one degree, the unit of the divided latitude line and the longitude line is not limited to one degree. For example, it may be divided by a longitude line and a latitude line of a unit of 1 minute, or may be divided by a unit of 2 degrees or 30 minutes instead of 1 minute or 1 degree. The unit for dividing the area, in other words, the number of digits of the upper or lower bit string can be changed by execution of an application of the positioning terminal 110 or the user terminal 120, or the like. When the number of digits of the upper or lower bit string is made variable, if the number of digits of the upper bit is made too large, the amount of communication will increase. Therefore, depending on the application, the lowermost digit of the upper bit string may be fixed and the lower digit may be variable.

  Moreover, although the positioning terminal 110 is transmitting the whole relative positional information, when positioning accuracy is not requested | required too much, you may transmit only a part of the relative positional information. For example, 0.1 seconds of latitude and longitude is about 1.11 meters (m). This resolution is sufficient for general surveillance applications. Therefore, for example, the positioning terminal 110 may be configured to transmit up to the 0.1 second digit of the relative position information and not to transmit the least significant digit of 0.01 second. In this case, a fixed value (for example, “0”) is set to the lowest digit that is not transmitted in the user terminal 120. As a result, the payload of the packet transmitted by the positioning terminal 110 can be further reduced as compared to the case of transmitting all of the relative position information.

[Configuration Example of User Terminal]
FIG. 7 is a block diagram showing an exemplary configuration of the user terminal 120 according to the first embodiment of the present technology. The user terminal 120 includes a control unit 121, a receiving unit 122, a data processing unit 123, a display unit 124, and a storage unit 125.

  The control unit 121 controls the entire user terminal 120. For example, when an operation for displaying the position of the positioning terminal 110 is performed, the control unit 121 controls the reception unit 122, the data processing unit 123, and the display unit 124 to start operations.

  The receiving unit 122 receives relative position information wirelessly transmitted from the positioning terminal 110. The receiving unit 122 supplies the received relative position information to the data processing unit 123. In addition to the relative position information, when information (such as positioning time) other than the area position information is transmitted, the receiving unit 122 also receives them and supplies the same to the data processing unit 123.

  The storage unit 125 stores registration position information. For example, a non-volatile memory such as a flash memory is used as the storage unit 125. The registration position information is held in advance in the storage unit 125 before the reception of the relative position information. For example, when the user inputs a predetermined address, the data processing unit 123 converts the address into coordinates consisting of latitude and longitude, and stores the information indicating the “degree” and direction of the latitude and longitude as registered position information. It is stored in 125 (in other words, registered). Alternatively, instead of the user inputting the address, the latitude and longitude “degrees” and the azimuth may be directly input.

  The data processing unit 123 estimates position information on the transmission side from the relative position information and the registered position information. When the receiving unit 122 receives the relative position information, the data processing unit 123 reads the registered position information from the storage unit 125, and estimates the position information by combining the registered position information and the relative position information. Then, the data processing unit 123 supplies the position information to the display unit 124. The data processing unit 123 is an example of the estimation unit described in the claims.

  The display unit 124 displays the position of the positioning terminal 110 indicated by the position information. For example, a liquid crystal display or an organic EL (ElectroLuminescence) display is used as the display unit 124. The display unit 124 displays, for example, a map, and displays a predetermined mark indicating the position of the positioning terminal 110 on the map. Note that the display unit 124 may display the coordinates of the latitude and longitude of the positioning terminal 110 as characters or numbers, or may convert the coordinates into an address for display.

  FIG. 8 is a diagram for explaining data processing in the first embodiment of the present technology. The positioning terminal 110 acquires position information R1 indicating its own longitude and latitude. In the bit string indicating the longitude and the latitude, the bit string corresponding to “degree” is positioned higher than the bit string corresponding to “minute” and “second”. Therefore, the upper bit string (that is, the area position information excluding the azimuth) corresponding to the "degree" is hereinafter referred to as "MUB (Measured Upper Bits)". Also, lower bit strings (that is, relative position information) corresponding to “minutes” and “seconds” are referred to as “MLB (Measured Lower Bits)”. The positioning terminal 110 extracts MLB (relative position information) from the position information and transmits it to the user terminal 120.

  In the storage unit 125 in the user terminal 120, a bit string indicating the "degree" of latitude and longitude and the direction is registered in advance as registration position information. Among the registration position information, a bit string indicating “degree” is hereinafter referred to as “RUB (Registered Upper Bits)”. Here, in the storage unit 125, registered position information indicating an area where a user (a child or an elderly person) carrying the positioning terminal 110 on the transmission side moves on a daily basis is stored.

  When receiving the relative position information, the user terminal 120 reads out the registered position information, combines it with the relative position information, and generates position information R1. The registered area is as wide as 111 kilometers (km) as described above. Therefore, normally, the measured MUB matches the registered RUB, and the user terminal 120 on the receiving side can estimate the same position information as the position information acquired by the positioning terminal 110 on the transmitting side. In addition, when using for monitoring a communication system, it is also assumed that the positioning terminal 110 crosses the boundary of a registration area | region.

[Operation example of communication system]
FIG. 9 is a flowchart illustrating an example of transmission processing according to the first embodiment of the present technology. This transmission process is started by the positioning terminal 110, for example, when the power is turned on. The positioning terminal 110 determines whether the current time is the time to be measured (step S911).

  If it is time to measure (Yes at Step S911), the positioning terminal 110 receives a radio wave from the GNSS satellite and acquires positioning information (Step S912). Then, the positioning terminal 110 extracts relative position information from the position information in the positioning information (step S913), and transmits the relative position information to the user terminal 120 (step S914).

  On the other hand, when it is not time to measure (step S911: No), or after step S914, the positioning terminal 110 repeatedly executes step S911 and subsequent steps.

  FIG. 10 is a flowchart illustrating an example of reception processing according to the first embodiment of the present technology. This reception process is started by the user terminal 120, for example, when a predetermined application for displaying position information is executed. The user terminal 120 determines whether relative position information has been received (step S981). When relative position information is received (step S981: Yes), the user terminal 120 reads out registration position information from the storage unit 125 (step S982). Then, the user terminal 120 combines the registered position information and the relative position information to obtain position information (step S983), and displays the position information (step S984).

  On the other hand, when relative position information is not received (Step S981: No), or after Step S984, the user terminal 120 repeatedly executes Step S981 and subsequent steps.

  As described above, when the positioning terminal 110 transmits part of the position information (relative position information), the amount of communication can be reduced compared to the case where the entire position information is transmitted. For example, it is assumed that the latitude and the longitude are measured in decimal notation in which "degree" is three digits, "minute" is two digits, second is "four digits", and the direction is one digit. Among the 10 digits, the upper 3 digits and the azimuth are registered in advance as region position information on the receiving side, and when the lowest digit is fixed, the positioning terminal 110 may transmit only the remaining 5 digits. Thereby, the payload of the packet to be transmitted can be reduced to about half as compared with the case where the entire position information is transmitted. However, since there is transmission data other than the payload, such as a training bit, the power required for transmission is not necessarily halved.

  As described above, according to the first embodiment of the present technology, the registered position information is registered in the storage unit 125 of the receiving side, and the transmitting side transmits only the relative position information among the position information, The amount of communication can be reduced compared to the case of transmitting the entire position information.

<2. Second embodiment>
In the above-described first embodiment, assuming movement such as walking, it is assumed that the positioning terminal 110 on the receiving side does not go out of the registration area of approximately 111 kilometers (km) square. However, it is also conceivable that the positioning terminal 110 leaves the registration area and moves to an adjacent area when the residence of a child or an elderly person carrying the positioning terminal 110 is near the boundary of the registration area. Even in this case, the user terminal 120 can acquire the position of the adjacent area by adding / subtracting “1” to the value of the registration position information. The communication system 100 according to the second embodiment is different from the first embodiment in that the position of the area adjacent to the registration area is acquired by the addition / subtraction of “1”.

  The user terminal 120 according to the second embodiment determines whether the positioning terminal 110 has crossed the registration area boundary based on the received relative position information, and is adjacent to the registration area by adding / subtracting “1”. Get the location of the area.

  In addition, since the positioning terminal 110 may be located out of a registration area | region, the user terminal 120 may carry out identification display so that the registration area | region on a map can be distinguished from another area | region.

  FIG. 11 is a diagram for describing registered position information and a guard band in the second embodiment of the present technology. In the RUB obtained by removing the direction from the registration position information, the least significant bit ULBS (Upper Least Significant Bit) indicates a range of one degree in the latitude direction or the longitude direction. For example, when RUB shows 35 degrees, if "1" is added to the RUB, the value after addition will show 36 degrees. For example, when RUB shows 35 degrees, if "1" is subtracted from the RUB, the value after subtraction will show 34 degrees.

  Here, buffer areas are provided inside and outside the registration area. The bit string corresponding to this buffer area is hereinafter referred to as GB (Guard Band). The GB is used by the user terminal 120 to determine whether the positioning terminal 110 has approached the boundary of the registration area.

  FIG. 12 is a diagram for describing the calculation of the longitude in the second embodiment of the present technology. A in the same figure is a figure for explaining the case where calculation is performed about longitude. An area from 139 degrees 00 minutes 00 seconds east to 140 degrees 00 minutes 00 seconds east longitude is assumed to be A1, and it is assumed that position information of this area is registered.

  Here, it is assumed that the positioning terminal 110 has moved from the coordinates 522 in the area A1 to the coordinates 523 in the area A4 next to the area A1. In addition, it is assumed that position information is measured by the positioning terminal 110 and relative position information is transmitted each time a fixed positioning cycle elapses. In this case, the user terminal 120 determines whether the positioning terminal 110 has crossed the boundary, based on the degree of change in relative position information. For example, when the positioning terminal 110 moves from the coordinate 522 for 59 minutes in the area A1 to the coordinate 523 for 1 minute in the adjacent area A4, the positioning terminal 110 transmits 59 minutes and then constant One minute is sent after the lapse of the positioning period of. If the positioning cycle is short (for example, 60 seconds), the distance between 59 minutes and 1 minute in the same area is about 107 kilometers (km), so 59 minutes to 1 minute in area A1 It is impossible for the positioning terminal 110 to move within the positioning period by means of ordinary moving means. As described above, when the change in the relative position information is large, it can be determined that the user terminal 120 has moved to the next area A4 beyond the boundary of the area A1. Since the longitude of the area A4 is 140 degrees east longitude, the user terminal 120 adds “1” to the longitude (RUB) of the registered position information to make it 139 degrees to 140 degrees. By executing this operation, the user terminal 120 on the receiving side can estimate the position information of the coordinates 523 of the area A4.

  B in FIG. 12 is a figure for demonstrating the case where the calculation using RUB is not performed. The area A1 is registered in the same manner as a in the figure, and the positioning terminal 110 is moved from the coordinates 522 in the area A1 to the coordinates in the area A4 next to the area A1. If “1” is not added to RUB, the position information of the coordinates 524 in the area A1 of the east longitude 139 degrees is erroneously synthesized although the area is actually moved to the area A4. On the other hand, the user terminal 120 according to the second embodiment adds “1” to the RUB, so that it can synthesize accurate position information as exemplified in a in FIG.

  FIG. 13 is a diagram for describing processing when straddling a zero-degree meridian and the equator in the second embodiment of the present technology. A in the same figure is a figure for demonstrating the process at the time of straddling a zero degree meridian. It is assumed that an area from 1 hour 00 minutes 00 seconds east to just before the 0 degree meridian is A1, and position information of this area is registered.

  Here, it is assumed that the positioning terminal 110 has moved from the coordinate 531 in the area A1 to the coordinate 532 in the adjacent area A4 beyond the zero meridian. The longitude of this area A4 is from 1 degree 00 minutes 00 seconds west to the meridian, and the value of the longitude is the same as that of the area A1 and only the azimuth is different. Therefore, the user terminal 120 reverses only the longitude direction. The same is true for the 180 degree meridian.

  B in FIG. 13 is a figure for demonstrating the process at the time of straddling the equator. An area from 1 minute 00 minutes 00 seconds south latitude to just before the equator is assumed to be A1, and position information of this area is assumed to be registered.

  Here, it is assumed that the positioning terminal 110 has moved from coordinates 531 in the area A1 to coordinates 533 in the next area A0 beyond the equator. The latitude of this area A0 is from north latitude 1 o'clock 00 minutes 00 seconds to the equator, and the value of the latitude is the same as that of the area A1 and only the azimuth is different. Therefore, the user terminal 120 reverses only the azimuth of the latitude.

  FIG. 14 is a flowchart illustrating an example of reception processing according to the second embodiment of the present technology. The reception process of the second embodiment is different from that of the first embodiment in that the registration position information calculation process (step S 930) for performing the calculation is further performed depending on whether or not the boundary is crossed.

  FIG. 15 is a flowchart illustrating an example of registered position information calculation processing according to the second embodiment of the present technology. The user terminal 120 executes the latitude calculation process for calculating the latitude (step S940), executes the longitude calculation process for calculating the longitude (step S960), and ends the registered position information calculation process.

FIG. 16 is a flowchart illustrating an example of the latitude calculation process according to the second embodiment of the present technology. In the figure, RLB _LA , GB _LA , MLB _LA , ULSB _LA , AUB _LA and RUB _LA indicate that the latitudes are RLB, GB, MLB, ULSB, AUB and RUB. First, the user terminal 120 determines whether the RLB _{LA of the} registration position information is smaller than the guard band GB _LA (that is, the registration area is closer to the low latitude side) (step S941). When RLB _LA is smaller than GB _LA (step S941: Yes), the user terminal 120 determines whether the positioning terminal 110 is on the low latitude side, depending on whether or not the measured MLB _LA is larger than (ULSB _LA- GB _LA ). It is judged whether or not it exceeds (step S942).

If MLB _LA is larger than (ULSB _LA −GB _LA ) (ie, the low latitude side boundary is crossed) (step S 942: Yes), the user terminal 120 subtracts “1” from RUB _LA , and AUB _LA is set (step S943). Then, the user terminal 120 determines whether the positioning terminal 110 has crossed the equator based on whether AUB _LA is -1 (step S944).

If AUB _LA is -1 (ie, exceeds the equator) (step S 944: Yes), the user terminal 120 corrects the AUB _LA by increment (step S 945). Also, the user terminal 120 reverses the azimuth of the latitude of the registered position information (step S946).

If AUB _LA is not −1 (that is, it does not exceed the equator) (step S 944: No), or after step S 946, the user terminal 120 ends the latitude calculation process.

If RLB _LA is greater than GB _LA (step S941: No), whether the user terminal 120 has RLB _LA greater than (ULSB _LA- GB _LA ) (ie, the registration area is closer to the high latitude side) (Step S947).

When RLB _LA is (ULSB _LA −GB _LA ) or more (step S947: Yes), whether the positioning terminal 110 has crossed the high latitude side boundary depending on whether the MLB _LA is smaller than GB _LA or not It is determined whether or not it is (step S948).

MLB _LA is _{GB LA} less when (i.e., high latitude side beyond boundaries) (step S948: Yes), the user terminal 120 is set to _{AUB LA} "1" is added to the _{RUB LA} (step S949 ).

If RLB _LA is smaller than (ULSB _LA −GB _LA ) (step S947: No), or if MLB _LA is equal to or greater than GB _LA (step S948: No), the user terminal 120 does not add or subtract but RUB _{LA as it} is , And AUB _LA (step S950). Even when MLB _LA is less than (ULSB _LA −GB _LA ) (step S942: No), step S950 is executed. After step S949 or S950, the user terminal 120 ends the latitude calculation process.

FIG. 17 is a flowchart illustrating an example of the longitude calculation process according to the second embodiment of the present technology. RLB _LO , GB _LO , MLB _LO , ULSB _LO , AUB _LO and RUB _LO in the same figure indicate that they are RLB, GB, MLB, ULSB, AUB and RUB of longitude. First, the user terminal 120 determines whether the RLB _{LO of the} registration position information is smaller than the guard band GB _LO (that is, the registration area is close to the 0 degree side) (step S 961). When the RLB _LO is smaller than the GB _LO (step S 961: Yes), the user terminal 120 determines whether the positioning terminal 110 is at the 0 degree side depending on whether the measured MLB _LO is larger than (ULSB _LO −GB _LO ). It is judged whether it exceeded (step S962).

If MLB _LO is larger than (ULSB _LO −GB _LO ) (that is, the 0 degree side boundary is crossed) (step S 962: Yes), the user terminal 120 subtracts “1” from RUB _LO and outputs AUB _LO The setting is made (step S963). Then, the user terminal 120 determines whether the positioning terminal 110 has crossed the zero-degree meridian according to whether or not AUB _LO is -1 (step S 964).

If the AUB _LO is -1 (ie, it exceeds the zero degree meridian) (step S964: Yes), the user terminal 120 corrects the AUB _LO by increment (step S965). Further, the user terminal 120 reverses the azimuth of the longitude of the registered position information (step S966).

If AUB _LO is not −1 (that is, it does not exceed the zero-degree meridian) (step S 964: No), or after step S 966, the user terminal 120 ends the longitude calculation process.

When RLB _LO is equal to or greater than GB _LO (step S 961: No), the user terminal 120 determines whether or not RLB _LO is equal to or greater than (ULSB _LO −GB _LO ) (ie, the registration region is closer to 180 degrees). It judges (step S967).

In addition, when RLB _LO is (ULSB _LO −GB _LO ) or more (step S 967: Yes), the user terminal 120 determines whether the positioning terminal 110 is on the 180 degree side, depending on whether MLB _LO is smaller than GB _LO. It is judged whether or not it exceeds (step S968).

MLB _LO is _{GB LO} less when (i.e., 180 degrees side beyond boundaries) (step S968: Yes), the user terminal 120 is set to _{AUB LO} adds "1" to the _{RUB LO} (step S969). Then, the user terminal 120 determines whether or not the positioning terminal 110 has crossed the 180 degree meridian according to whether or not the AUB _LO is 180 (step S 970).

If the AUB _LO is 180 (ie, it exceeds the 180 degree meridian) (step S 970: Yes), the user terminal 120 corrects the AUB _LO by decrementing (step S 971). Also, the user terminal 120 reverses the azimuth of the longitude of the registered position information (step S 972).

If AUB _LO is not 180 (ie, it does not exceed the 180 degree meridian) (step S 970: No), or after step S 972, the user terminal 120 ends the longitude calculation process.

If RLB _LO is smaller than (ULSB _LO −GB _LO ) (step S 967: No), or if MLB _LO is equal to or greater than GB _LO (step S 968: No), the user terminal 120 does not add or subtract, and directly uses RUB _LO . , AUB _LO (step S973). Also when MLB _LO is less than (ULSB _LO −GB _LO ) (step S 962: No), step S 973 is executed. After step S973, the user terminal 120 ends the longitude calculation process.

  Although the user terminal 120 determines whether it has crossed the equator and whether it has crossed the zero degree or 180 degree meridian, it may execute only one of them. It may be configured not to execute both. For example, if it is assumed that only a country (such as the United Kingdom) or a region where the equator does not pass while passing the meridian of 0 degrees and 180 degrees is assumed, it is not necessary to determine whether the equator is crossed. In countries and regions where the equator passes while the 0 and 180 degree meridians do not pass (such as South America), it is not necessary to judge whether or not the meridians have passed. In countries (such as Japan) and regions where the equator and 0 and 180 degree meridians do not pass, both judgments become unnecessary.

  In addition, although it is determined whether the user terminal 120 on the receiving side has passed the boundary, the determination may be performed by the positioning terminal 110 on the transmitting side. However, since the processing load on the transmitting side increases, it is desirable that the receiving side determine whether or not the boundary is crossed.

  FIG. 18 is a diagram showing an example of a data configuration of calculation information to be transmitted when determining whether the positioning terminal 110 has crossed a boundary in the second embodiment of the present technology. The operation information includes, for example, latitude operation information, a latitude direction inversion flag, longitude operation information, and a longitude direction inversion flag. The positioning terminal 110 on the transmission side stores the registered position information in advance, and generates and transmits this operation information by comparing the measured position information with the registered position information. Then, the user terminal 120 on the receiving side performs addition / subtraction of “1” and inversion of the direction based on the operation information.

  The latitude operation information indicates the operation content regarding the latitude. For example, when instructing calculation to add "1" to the latitude (RUB) of the registered position information, "+1" is set in the latitude operation information, and when instructing subtraction of "1", "-" is specified in the latitude operation information. 1 is set. In addition, the value of the longitude remains as it is, and when only the direction is inverted, “0” is set in the latitude operation information.

  The latitude azimuth inversion flag is information indicating whether or not to reverse the azimuth of the latitude. As described above, when the positioning terminal 110 moves across the equator, the azimuth of the latitude is reversed.

  The longitude calculation information indicates the content of calculation regarding the longitude. For example, when instructing calculation to add “1” to the longitude (RUB) of the registration position information, “+1” is set in the longitude calculation information, and when instructing subtraction of “1”, “−” is specified in the longitude calculation information. 1 is set. In addition, the value of the longitude remains as it is, and when only the direction is reversed, “0” is set in the longitude calculation information.

  The longitude direction inversion flag is information for instructing whether to reverse the direction of the longitude. As described above, when the positioning terminal 110 moves across the 0 degree or 180 degree meridian, the longitude direction is reversed.

  As described above, according to the second embodiment of the present technology, the user terminal 120 performs addition or subtraction on the value of the registered position information, so that the positioning terminal 110 moves to an area adjacent to the registered area. Even if it is, the user terminal 120 can estimate the position after movement.

[First Modification]
In the above-described first and second embodiments, the positioning terminal 110 extracts the lower bits of the positioning information as relative position information, but acquires the difference between the positioning information and the registered position information as relative position information. You may The communication system of the first modification is different from the first and second embodiments in that the positioning terminal 110 calculates the difference between the positioning information and the registered position information. However, in this configuration, the amount of communication can be reduced, but the processing load on the transmitting side increases.

  FIG. 19 is a block diagram illustrating a configuration example of the positioning terminal 110 in the first modified example of the present technology. The positioning terminal 110 of the first modified example is different from that of the first embodiment in that a storage unit 115 is further provided. In the storage unit 115, the same information as registered position information registered in the user terminal 120 is registered in advance.

  FIG. 20 is a diagram for describing difference calculation in the first modified example of the present technology. In the first modification, position information indicating a predetermined reference point is registered in advance as registration position information. The positioning terminal 110 calculates the difference between the registered position information and the positioning information. This difference indicates the relative position from the registered reference point. For example, when the point REG1 of “35 degrees 01 minutes 01 seconds” is registered and the point M1 of “35 degrees 02 minutes 02 seconds” is positioned, “+1 minute 1 second” is calculated as their difference DIF1. The minutes and seconds of the registration position may be 00 minutes 00 seconds. Also, when the point M2 of "35 degrees 00 minutes 01 seconds" is measured, "-1 minute" is calculated as the difference DIF2. The positioning terminal 110 transmits the information on the difference as relative position information. Thus, difference information (relative position information) is represented by a code and an absolute value. Further, the significant digit of this difference information is set in consideration of the moving speed of the object to be watched. Even when crossing the zero degree or the 180 degree meridian or the equator, it is not necessary to add information other than the sign and the absolute value. On the other hand, the user terminal 120 adds the received relative position information (difference) to the registered position information, and acquires position information indicating the absolute position of the positioning terminal 110.

  FIG. 21 is a diagram for describing data processing in the first modified example of the present technology. In the storage unit 115 of the positioning terminal 110, registered position information REG1 indicating a predetermined reference point is stored in advance. The positioning terminal 110 acquires position information M1 indicating its own longitude and latitude. Then, the positioning terminal 110 calculates the difference between the position information M1 and the registered position information REG1 as the relative position information DIF1 and transmits it. The relative position information DIF1 includes the sign of the difference and the absolute value of the difference.

  When receiving the relative position information DIF1, the user terminal 120 reads out the registered position information REG1 and adds it to the relative position information DIF1 to generate position information M1.

  FIG. 22 is a flowchart illustrating an example of transmission processing in the first modified example of the present technology. The transmission process of the first modification is different from that of the second embodiment in that steps S915 and S916 are performed instead of step S913.

  When the positioning terminal 110 acquires positioning information (step S912), it reads registered position information (step S915), and calculates the difference between them as relative position information (step 916). Then, the positioning terminal 110 transmits the calculated relative position information to the user terminal 120 (step S914).

  FIG. 23 is a flowchart illustrating an example of reception processing in the first modified example of the present technology. The reception process of the first modification is different from that of the first embodiment in that S988 is executed instead of step S983.

  The user terminal 120 reads out registration position information (step S982), adds relative position information (difference) to the registration position information, and acquires position information (step S988). Then, the user terminal 120 displays the position information (step S984).

  Thus, according to the first modified example of the present technology, the positioning terminal 110 transmits the difference between the measured position information and the registered position information as relative position information, so the position information can be used as it is without obtaining the difference. The amount of communication can be reduced compared to the case of transmission.

Second Modified Example
In the first and second embodiments described above, the communication system 100 represents latitude and longitude in degrees, minutes, and seconds, but may also represent the latitude and longitude in a notation other than degrees, minutes, and seconds, such as milliseconds. . This second modification differs from the first and second embodiments in that latitude and longitude are represented in millisecond format.

FIG. 24 is a diagram showing a movement path across the 180 degree meridian and the equator in the second modified example of the second embodiment of the present technology. In the figure, a indicates the movement path across the 180 degree meridian, and b in the figure indicates the movement path across the equator. In millisecond format, longitude and latitude are expressed in milliseconds only. In addition, the azimuth is represented by the sign of "+" or "-". For example, assuming that “degree” of latitude is d, “min” is m, and “second” is s, values in degrees, minutes, and seconds can be converted to millisecond values MS according to the following equation. Here, d and m are integers, and MS and s are real numbers.
MS = (d x 3600 + m x 60 + s) x 1000

  According to the above equation, the range of longitude from 0 degrees to 180 degrees is converted from “0.000” milliseconds to “648,000.000” milliseconds, assuming that the decimal place is three digits. The range of longitude is divided, for example, in units of "1,000.000" milliseconds. In decimal notation, the upper three digits indicate the position of the area, and the remaining lower digits indicate the relative position. Therefore, the boundary of the region immediately before the 180 degree meridian is "± 647,000.000" milliseconds. Here, the signs of "+" and "-" indicate the direction of longitude.

  In addition, the latitude is also divided by "1,000" milliseconds. Therefore, as illustrated in b in FIG. 24, the boundary of the region immediately before the equator is “± 1,000.000” milliseconds. Here, the signs of "+" and "-" indicate the azimuth of the latitude. The positioning terminal 110 transmits only the lower digits (relative position information) of these latitudes and longitudes.

  Thus, according to the second variation of the present technology, the positioning terminal 110 transmits lower digits of latitude and longitude expressed in milliseconds, so that it transmits both of upper and lower digits. The amount of communication can be reduced.

  Note that the above-described embodiment shows an example for embodying the present technology, and the matters in the embodiment and the invention-specifying matters in the claims have correspondence relationships. Similarly, the invention specific matter in the claims and the matter in the embodiment of the present technology with the same name as this have a correspondence relation, respectively. However, the present technology is not limited to the embodiments, and can be embodied by variously modifying the embodiments without departing from the scope of the present technology.

  Further, the processing procedure described in the above embodiment may be regarded as a method having a series of these procedures, and a program for causing a computer to execute the series of procedures or a recording medium storing the program. You may catch it. As this recording medium, for example, a CD (Compact Disc), an MD (Mini Disc), a DVD (Digital Versatile Disc), a memory card, a Blu-ray disc (Blu-ray (registered trademark) Disc) or the like can be used.

  In addition, the effect described in this specification is an illustration to the last, is not limited, and may have other effects.

The present technology can also be configured as follows.
(1) A transmitter for acquiring and transmitting relative position information indicating a relative position from a predetermined reference point;
A communication system comprising: a predetermined registration position information stored in advance; and a receiving device for estimating position information from the relative position information and the registered position information when the relative position information is received.
(2) The transmitting apparatus acquires the relative position information from position information including area position information indicating the position of the measured area and the relative position information.
The communication system according to (1), wherein the registered position information is position information indicating a position of a specific area.
(3) One of the transmitting device and the receiving device executes a predetermined operation for calculating position information of the transmitting device when the transmitting device exceeds the boundary of the specific area (2 ) Communication system as described.
(4) A predetermined buffer area is set near the boundary,
The communication system according to (3), wherein one of the transmitting device and the receiving device determines whether the transmitting device has crossed the boundary based on the predetermined buffer area and the relative position information.
(5) The registration position information includes the longitude of the specific area,
The communication system according to (3), wherein the transmitting device inverts the direction of the longitude in the case where the transmitting device crosses the zero degree meridian and the case where the transmitting device crosses the 180 degree meridian.
(6) The registration position information includes the latitude of the specific area,
The communication system according to any one of (3) to (5), wherein one of the transmitting device and the receiving device reverses the azimuth of the latitude when the transmitting device crosses the equator.
(7) The registration position information is information indicating the position of the predetermined reference point,
The communication system according to (1), wherein the transmitting device stores the registered position information in advance, acquires position information, and transmits the difference between the position information and the registered position information as the relative position information. .
(8) The communication system according to any one of (1) to (7), wherein the receiving device displays the position of the transmitting device indicated by the position information on a display unit.
(9) The communication system according to any one of (1) to (8), wherein the relative position information indicates the measurement value of the minute and the second of the degree, the minute and the second of the latitude and longitude.
(10) The communication system according to any one of (1) to (8), wherein the relative position information indicates the lower digit of the upper digit and the lower digit of the millisecond measurement value of latitude and longitude.
(11) A position information acquisition unit that acquires relative position information indicating a relative position from a predetermined reference point;
And a transmitter configured to transmit the relative position information.
(12) a storage unit that stores predetermined registration position information;
A receiver that receives relative position information indicating a relative position from a predetermined reference point;
A receiver configured to estimate position information from the relative position information and the registered position information.
(13) A position information acquisition procedure for acquiring relative position information indicating a relative position from a predetermined reference point;
And a transmission procedure of transmitting the relative position information.
(14) a reception procedure for receiving relative position information indicating a relative position from a predetermined reference point;
A control method of a receiving apparatus, comprising: an estimation procedure of estimating position information from the registered position information read out from a storage unit storing predetermined registered position information and the relative position information.
(15) A position information acquisition procedure for acquiring relative position information indicating a relative position from a predetermined reference point,
A program for causing a computer to execute a transmission procedure for transmitting the relative position information.
(16) a reception procedure for receiving relative position information indicating a relative position from a predetermined reference point;
A program for causing a computer to execute an estimation procedure for estimating position information from the registered position information read out from a storage unit storing predetermined registered position information and the relative position information.

Reference Signs List 100 communication system 110 positioning terminal 111, 121 control unit 112 GNSS reception unit 113, 123 data processing unit 114 transmission unit 115, 125 storage unit 120 user terminal 122 reception unit 124 display unit

Claims (16)

A transmitter for acquiring and transmitting relative position information indicating a relative position from a predetermined reference point;
A communication system comprising: a predetermined registration position information stored in advance; and a receiving device for estimating position information from the relative position information and the registered position information when the relative position information is received. The transmitting apparatus acquires the relative position information from position information including area position information indicating the position of the measured area and the relative position information.
The communication system according to claim 1, wherein the registered position information is position information indicating a position of a specific area. The communication according to claim 2, wherein one of the transmitting device and the receiving device executes a predetermined operation for calculating positional information of the transmitting device when the transmitting device exceeds the boundary of the specific area. system. A predetermined buffer area is set near the boundary,
The communication system according to claim 3, wherein one of the transmitting device and the receiving device determines whether the transmitting device has crossed the boundary based on the predetermined buffer area and the relative position information. The registration position information includes the longitude of the specific area,
The communication system according to claim 3, wherein one of the transmitting device and the receiving device inverts the direction of the longitude in the case where the transmitting device crosses the zero degree meridian and in the case where the transmitting device crosses the 180 degree meridian. The registration position information includes the latitude of the specific area,
The communication system according to claim 3, wherein one of the transmitting device and the receiving device reverses the azimuth of the latitude when the transmitting device crosses the equator. The registered position information is information indicating the position of the predetermined reference point,
The communication system according to claim 1, wherein the transmission device stores the registered position information in advance, acquires position information, and transmits a difference between the position information and the registered position information as the relative position information. The communication system according to claim 1, wherein the receiving device displays a position of the transmitting device indicated by the position information on a display unit. The communication system according to claim 1, wherein the relative position information indicates a measurement value of the minute and the second of a degree, a minute and a second of latitude and longitude. The communication system according to claim 1, wherein the relative position information indicates the lower digit of the upper digit and the lower digit of the millisecond measurement value of the latitude and longitude. A position information acquisition unit that acquires relative position information indicating a relative position from a predetermined reference point;
And a transmitter configured to transmit the relative position information. A storage unit that stores predetermined registration position information;
A receiver that receives relative position information indicating a relative position from a predetermined reference point;
A receiver configured to estimate position information from the relative position information and the registered position information. Position information acquisition procedure for acquiring relative position information indicating a relative position from a predetermined reference point;
And a transmission procedure of transmitting the relative position information. A reception procedure for receiving relative position information indicating a relative position from a predetermined reference point;
A control method of a receiving apparatus, comprising: an estimation procedure of estimating position information from the registered position information read out from a storage unit storing predetermined registered position information and the relative position information. Position information acquisition procedure for acquiring relative position information indicating a relative position from a predetermined reference point;
A program for causing a computer to execute a transmission procedure for transmitting the relative position information. A reception procedure for receiving relative position information indicating a relative position from a predetermined reference point;
A program for causing a computer to execute an estimation procedure for estimating position information from the registered position information read out from a storage unit storing predetermined registered position information and the relative position information.

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