JP2006105721A - Positioning driver, positioning system, positioning method, positioning terminal unit, positioning driver program, and positioning program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To specify a further accurate position, by performing highly accurate positioning using a surface correction in addition to a correction of an ionospheric convection layer, by inputting a distance dependence error in addition to a pseudo-distance correction quantity by using algorithm for correcting the ionospheric convection layer of an LSI for GPS, even in a GPS receiver mounted with a general LSI for GPS. <P>SOLUTION: This positioning driver outputs correction information of a first system to a position measuring device; and has a correction information communication part for receiving correction information of a second system different from the correction information of the first system; a correction information generating part for generating correction information of a third system on the basis of the correction information of the second system received by the correction information communication part; and a communication interface part for transmitting the correction information of the third system generated by the correction information generating part to the position measuring device by regarding the correction information as the correction information of the first system. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a positioning driver that obtains positioning data with higher accuracy by correcting positioning data whose position is measured using GPS (Global Positioning System), and a positioning terminal device and a positioning system configured using the positioning driver. And a positioning method for obtaining positioning data with higher accuracy, a positioning driver program for realizing a positioning driver of a positioning terminal device, and a positioning program for realizing a positioning method.

  Positioning technology using GPS has become widespread, and it is possible to display a position on a map on a screen even in portable electronic devices such as PDAs (Personal Digital Assistance) and mobile phones that can be carried around.

  The GPS receives radio waves transmitted from GPS satellites (usually four or more) that are orbiting around the earth, and the positioning device that is the receiver receives them, and measures the arrival time of the received radio waves. Thus, the distance between each GPS satellite and the positioning device is calculated (hereinafter referred to as “normal measurement method”) to identify the position of the positioning device.

  Conventionally, the position is specified using only the calculated distance between the positioning device and the GPS satellite (this method is called “single positioning”). However, the position of the positioning device specified using this method is a value including an error.

  There are several causes for the occurrence of this error, but one of the main causes is a delay in radio waves generated in the ionosphere or convection layer that passes while radio waves reach the positioning device from GPS satellites. Due to this delay, the arrival time of the radio wave becomes longer, and an error occurs in the calculated distance. As a result, an accurate distance between the positioning device and the GPS satellite cannot be obtained, and the position cannot be specified with sufficient accuracy.

  In order to solve this problem and secure sufficient accuracy for position identification, the calculated distance between the positioning device and the GPS satellite is corrected (referred to as “ionospheric convection layer correction”).

The method for ionospheric convection correction is as follows.
(1) A plurality of electronic reference points whose precise positions are known are installed. Each electronic reference point is measured by measuring the distance between the electronic reference point and the GPS satellite at that time (a distance including an error, referred to as “pseudo distance”) by using the above-described normal measurement method. Is transmitted to the correction center server via the communication network.
(2) The correction center server calculates an accurate distance between each electronic reference point and the GPS satellite based on the accurate position of each electronic reference point and the position of the GPS satellite at that time.
(3) The correction center server calculates an error in the distance between each electronic reference point and the GPS satellite from the accurate distance between the calculated electronic reference point and the GPS satellite and the pseudo distance received from the electronic reference point. The error is stored together with the position information of the electronic reference point where the error is calculated.
(4) The positioning device calculates the distance (pseudo distance including error) between the positioning device and the GPS satellite at the time using the above-described normal measurement method, and after positioning the position of the positioning device, The distance and the position of the positioning device are transmitted to the correction center server via the communication network.
(5) The correction center server specifies, for example, the nearest electronic reference point from the received position of the positioning device, and stores the error stored together with the positional information of the specified electronic reference point from the positioning device. By adding or subtracting to, a more accurate distance between the positioning device and the GPS satellite is calculated.
(6) The correction center server calculates a more accurate distance between the positioning device and the GPS satellite for a plurality of (usually four or more) GPS satellites, and uses the calculated distance between the positioning device and the GPS satellite, Identify a more accurate location of the positioning device.

  Such a positioning method based on the ionospheric convection correction method is referred to as DGPS (Differential Global Positioning System).

  However, even if this ionospheric convection correction is performed, not all errors are eliminated. That is, the error in the distance between the electronic reference point and the GPS satellite and the error in the distance between the positioning device and the GPS satellite do not exactly match, that is, a difference in error (this difference in error is referred to as a “distance-dependent error”). It is because there is.

  When the positioning device is in the vicinity of the electronic reference point, it is considered that the error in the distance between the electronic reference point and the GPS satellite is almost the same as the error in the distance between the positioning device and the GPS satellite. However, when the positioning device is far from the electronic reference point, the distribution of the ionosphere and convection layer is biased, resulting in a difference in radio wave delay. As a result, the error in the distance between the electronic reference point and the GPS satellite and the positioning device There will be a difference in the error in the distance between the GPS satellite and the GPS satellite.

  Therefore, even if the positioning device corrects the distance between the positioning device and the GPS satellite in consideration of the error in the distance between the electronic reference point received from the electronic reference point and the GPS satellite, the value is determined at that time. The true distance between the device and the GPS satellite is a different value. As a result, a more accurate position of the positioning device cannot be specified.

Further correction is performed to eliminate the remaining “distance-dependent error”. One method for performing correction is surface correction. In the surface correction method, the following is performed after the above (5).
(5-2) The correction center server calculates a distance-dependent error according to the distance (referred to as the base line length) from the electronic reference point to the positioning device based on the distribution of the ionosphere and convection layer at that time.
(5-3) The correction center server further adds a distance-dependent error according to the distance from the electronic reference point at that time to the more accurate distance between the positioning device calculated in (5) and the GPS satellite. Alternatively, a more accurate distance between the positioning device and the GPS satellite is calculated by subtraction.

  In addition to such ionospheric convection layer correction, positioning that performs surface correction is referred to as FKP-DGPS (Flaeohen Color Parameter-Differential Global Positioning System).

Note that standards relating to ionospheric convective layer correction and surface correction are defined by Non-Patent Document 1 as RTCM1 (ionospheric convective layer correction) and RTCM59 (surface correction).
“RTCM RECOMMENDED STANDARDDS FOR DIFFERENTIAL NAVSTAR GPS SERVICE VERSION 2.1”, Radio Technical Commission for Maritime Services, January 1994. Wubbena, G.M. A. Bagge, “RTCM Message Type 59-FKP for Transmisson of FKP”, Geo ++ (R) White Paper, April 2002, Garbsen.

  I would like to realize such ionospheric convection layer correction and surface correction even in portable electronic terminals. However, it is difficult to cause a conventional portable electronic terminal to perform positioning calculation processing for performing ionospheric convection layer correction and surface correction because of the processing speed and memory capacity of the portable electronic terminal.

  Therefore, it is conceivable to perform ionospheric convection layer correction and surface correction by a positioning calculation processing unit provided in a GPS receiver (for example, a GPS card) attached to the portable electronic terminal. The use of the positioning calculation processing unit of the GPS receiver is also desirable from the viewpoint of effectively using it.

  However, the conventional GPS LSI (Large Scale Integration) that constitutes the positioning calculation processing unit recognizes the pseudorange correction amount for performing ionospheric convection correction, and has an algorithm to perform correction, but performs surface correction. In order to do this, it is common that the distance dependent error is calculated from the surface correction parameter, and no algorithm for correcting is provided. Actually, there is currently no GPS LSI having an algorithm for performing surface correction.

  Therefore, in order to solve this problem, even in a GPS receiver equipped with a general GPS LSI, an algorithm for performing ionospheric convection correction of the GPS LSI is used in addition to the pseudorange correction amount. By inputting a distance-dependent error, an object is to perform highly accurate positioning using surface correction in addition to ionospheric convective layer correction so that a more accurate position can be specified.

  The pseudo distance is measured, the measured pseudo distance is corrected using the correction information of the first method, the position is measured, and the correction information of the first method is output to the position positioning device that generates position positioning data. The positioning driver that receives the correction information of the second method different from the correction information of the first method, and the third information based on the correction information of the second method received by the correction information communication unit. A correction information generating unit that generates correction information of the above-described method, and a communication interface unit that regards the correction information of the third method generated by the correction information generating unit as correction information of the first method and transmits the correction information to the positioning device. I decided to prepare.

  According to the present invention, although an algorithm for performing ionospheric convective layer correction is provided, even a GPS receiver equipped with a general GPS LSI that does not have an algorithm for performing surface correction can perform surface correction. By inputting the distance-dependent error to be performed in the data format of the correction information for performing ionospheric convective layer correction together with the pseudo-range correction amount for performing ionospheric convective layer correction, the error in the distance between the GPS satellite and the positioning device is input. Compared to the case where only layer correction is performed, the number can be reduced, and as a result, the position can be specified more accurately than in the prior art.

Embodiment 1 FIG.
In this embodiment, a portable electronic device equipped with a position measuring device (GPS receiver) equipped with a general GPS LSI receives an ionospheric convection correction parameter, a surface correction parameter, and a correction parameter from a correction center via a communication network. And a new pseudo-range correction amount is generated from the pseudo-distance correction amount included in the received ionospheric convection correction parameter and the distance-dependent error calculated from the surface correction parameter. An embodiment for specifying a correct position will be described.

FIG. 1 is a diagram showing a configuration of a positioning system in the present embodiment.
The positioning system includes a portable electronic device 100, a positioning device 200, a communication card 300, a correction center 400, and an electronic reference point 500. The correction center 400 is provided with a correction center server 410 and a map server 420 which will be described later. The portable electronic device 100 and the positioning device 200 and the communication card 300 are directly connected by a connector or the like. The communication card 300 and the correction center 400 are connected via a communication network such as a wireless line or the Internet, and the correction center 400 and the electronic reference point 500 are also connected via the communication network.

  The portable electronic device 100 includes an input function (input key), a display function (screen), a storage function (memory), a communication function, and a direct data transfer function with other devices. This applies to typical PDAs and mobile phones. In addition, the portable electronic device 100 measures the position, corrects the measured position using the correction information, and outputs the positioning information to the positioning device that generates the positioning data, and stores the map data. A map data storage unit, and a map application execution unit for specifying a position indicated by the position positioning data generated by the position positioning device in a map generated using the map data read from the map data storage unit.

  The positioning device 200 receives radio waves from a plurality of (usually four or more) GPS satellites, measures the arrival times of the received radio waves, and determines the position of each GPS satellite and the position from the measured arrival times of the radio waves. The distance to the device 200 is calculated, the position of the position positioning device 200 is specified from the calculated distance between each GPS satellite and the position positioning device 200, and the specified position is output as positioning data. At that time, the error of the distance between the GPS satellite and the position positioning device 200 is corrected.

  The communication card 300 connects the portable electronic device 100 to the correction center server 410 and the map server 420 of the correction center 400 via a communication network. For example, a PHS (Personal Handyphone System) (registered trademark) card can be used as the communication card 300, and is connected to the correction center server 410 and the map server 420 via a telephone line or the Internet.

  The correction center 400 includes a correction center server 410 and a map server 420. The correction center 400 provides an ionospheric convective layer correction parameter including a pseudo distance correction amount and a surface correction parameter for calculating a distance-dependent error in response to a request of the portable electronic device 100. The correction center 400 provides map data.

  The electronic reference point 500 calculates a distance error between the GPS satellite and the electronic reference point 500 to obtain a pseudo-range correction amount, and generates a surface correction parameter by an electronic reference point network including a plurality of electronic reference points. The ionospheric convection layer correction parameter including the pseudo distance correction amount and the generated surface correction parameter are provided to the correction center 400.

  That is, the positioning system receives the ionospheric convection correction parameter and the surface correction parameter from the correction center server 410, stores the ionospheric convection correction parameter and the surface correction parameter, and receives the ionospheric convection correction parameter and the surface correction parameter. A portable electronic device 100 that generates a new pseudorange correction amount based on the layer correction parameter and the surface correction parameter, and a pseudorange correction amount that includes the new pseudorange correction amount generated by the portable electronic device 100 in the ionospheric convection layer correction parameter. In view of this, it is provided with a position positioning device 200 that corrects the position obtained by positioning and generates and outputs positioning data (position positioning data).

FIG. 2 is a diagram showing in detail the configuration of the portable electronic device 100 and the correction center 400.
The portable electronic device 100 includes a positioning driver 110, a map application execution unit 120, and a map data storage unit 130.

The positioning driver 110 is built in the portable electronic device 100.
The positioning driver 110 calculates a new pseudo distance correction amount from the pseudo distance correction amount included in the ionospheric convection layer correction parameter received by the communication card 300 from the correction center server 410 and the distance-dependent error calculated from the surface correction parameter. Output to the positioning device 200. Thereafter, the positioning data measured by the positioning device 200 is acquired and passed to the map application execution unit 120.

  The map application execution unit 120 reads the map data from the map data storage unit 130 and displays it on the screen of the portable electronic device 100, and further, the position indicated by the positioning data received from the positioning driver 110 on the map displayed on the screen. Is displayed.

  The map data storage unit 130 stores map data used by the map application execution unit 120. Further, new map data is downloaded from the map server 420 of the correction center 400 as necessary.

The correction center 400 includes a correction center server 410 and a map server 420.
The correction center server 410 receives the pseudo distance between the GPS satellite and the electronic reference point 500 from the electronic reference point 500, generates a pseudo distance correction amount from the received pseudo distance, and calculates the electronic distance from the distribution of the ionosphere and convection layer. A surface correction parameter corresponding to the distance from the reference point 500 is generated, and the ionospheric convection layer correction parameter including the calculated pseudo distance correction amount and the generated surface correction parameter are provided to the portable electronic device 100 as required.

  The map server 420 accumulates and stores map data.

  FIG. 3 is a diagram showing the configuration of the positioning driver 110 in detail.

  The positioning driver 110 includes a correction information communication unit 111 that receives the ionospheric convection correction parameter and the surface correction parameter, a pseudo distance correction amount included in the ionospheric convection correction parameter received by the correction information communication unit 111, and the received surface correction parameter. The correction information generation unit 112 that generates a new pseudo distance correction amount based on the distance-dependent error calculated from the above, and the new pseudo distance correction amount generated by the correction information generation unit 112 as a normal pseudo distance correction amount The communication interface unit 113 that transmits to the device and the positioning result output interface unit 114 that outputs the positioning data measured by the position positioning device 200 using the pseudo distance correction amount to the map application execution unit 120 are configured.

  In addition, the positioning driver 110 measures the pseudo distance and corrects the measured pseudo distance using the pseudo distance correction amount to generate positioning data (position positioning data). Output.

  The correction information communication unit 111 connects to the correction center server 410 via the communication card 300 and logs in. Then, the electronic reference point is designated by transmitting the current position data together with the request. The position data of the designated electronic reference point 500, the ionospheric convection layer correction parameter, and the surface correction parameter are received from the correction center server 410, and the received position data of the electronic reference point 500, the ionospheric convection layer correction parameter, and the surface correction parameter are received. Is output to the correction information generation unit 112.

  The correction information generation unit 112 generates a new pseudo distance correction amount from the ionospheric convection layer correction parameter and the surface correction parameter input from the correction information communication unit 111 and outputs them to the communication interface unit 113.

  Specifically, the correction information generation unit 112 is based on the surface correction parameters input from the correction information communication unit 111, the position data of the designated electronic reference point 500, and the current position data of the portable electronic device 100 including the positioning driver. By calculating the distance-dependent error, converting the calculated distance-dependent error format into the pseudo-range correction amount format included in the ionospheric convection correction parameter, and subtracting the converted distance-dependent error to the pseudo-range correction amount, a new A pseudo distance correction amount is generated.

  Here, the ionospheric convective layer correction parameter including the pseudo distance correction amount corresponds to “correction information of the first method” or “correction information of the ionospheric convective layer correction method” described in the claims, and is a distance-dependent error. The surface correction parameter for calculating is equivalent to “second method correction information” or “surface correction method correction information” recited in the claims, and the new pseudo-range correction amount is described in the claims. Corresponds to the “third type of correction information”.

  The communication interface unit 113 inputs and outputs data with the position measurement device 200. When the correction information generation unit 112 generates a new pseudo distance correction amount, the communication interface unit 113 regards the input new pseudo distance correction amount as a normal pseudo distance correction amount and outputs the normal pseudo distance correction amount to the position measurement device 200. Positioning data measured by the positioning device 200 using the pseudo distance correction amount is input (in the case of FKP-DGPS). In addition, when the correction information generation unit 112 has not generated a new pseudo distance correction amount, or when the correction information communication unit 111 is not communicating, the positioning data measured by the position positioning device 200 by independent positioning is used. Enter (for single positioning). The input positioning data is output to the positioning result output interface unit 114, the correction information generation unit 112, and the correction information communication unit 111.

  The positioning result output interface unit 114 receives positioning data from the communication interface unit 113 and outputs the positioning data to the map application execution unit 120.

  As described above, in the positioning driver 110, the communication interface unit 113 receives the positioning data (position positioning data) from the position positioning device 200, and the correction information communication unit 111 calculates the pseudo distance correction amount included in the ionospheric convective layer correction parameter. The correction information generation unit 112 receives the surface correction parameter for calculating the distance-dependent error, and the correction information generation unit 112 receives the position indicated by the positioning data (position positioning data) received by the communication interface unit 113 and the surface received by the correction information communication unit 111. Based on the correction parameter, the distance dependent error is calculated, and the distance dependent error is subtracted from the pseudo distance correction amount to obtain a new pseudo distance correction amount, and the new pseudo distance correction amount is set as the pseudo distance correction amount.

  Here, the pseudo distance correction amount corresponds to the “first distance correction value” recited in the claims, the distance-dependent error corresponds to the “second distance correction value”, and the new pseudo distance correction amount. Corresponds to a “third distance correction value” recited in the claims.

  Next, an algorithm in which the correction information generation unit 112 generates a new pseudo distance correction amount will be described. It is necessary to generate a new pseudo distance correction amount for all GPS satellites used for positioning.

The definitions of the symbols used are shown below.
[Symbols included in ionospheric convection correction parameters]
-IOD_1: Identification number for identifying ionospheric convection layer correction parameters updated every predetermined time-PRC_1: Pseudo distance correction amount [Symbols included in surface correction parameters]
IOD — 59: Identification number for identifying a surface correction parameter updated every predetermined time • NO: Coefficient of latitude direction • NI: Coefficient of latitude direction • EO: Coefficient of longitude direction • EI: Coefficient of longitude direction [ Other symbols]
(Φ_R, λ_R): coordinates (latitude, longitude) [deg] indicating the position of the electronic reference point 500 (obtained from the correction center server)
(Φ, λ): coordinates (latitude, longitude) [deg] indicating the position of the mobile electronic device 100 (the latest coordinates are obtained from the position positioning device 200 and used)
H: H = 1 + 16 (0.53-E / π) ³
E: Satellite elevation [rad]

The conditions for generating a new pseudo distance correction amount are shown below.
When IOD_1 = IOD_59, a new pseudo distance correction amount is generated.
When IOD_1 ≠ IOD_59, the conventional pseudo distance correction amount is transmitted to the receiver as it is. -The reception interval of the ionospheric convection correction parameter is 1 second. For this reason, the latest ionospheric convection correction parameters received at 1 second intervals are used.
-The transmission interval of the surface correction parameter is 10 seconds. For this reason, the same surface correction parameter is used for 10 seconds.

The generation algorithm is shown below.
(1) If the distance-dependent error due to the ionosphere is δ_O and the distance-dependent error due to the convection layer is δ_I,
δ_O = 6.37 (NO (Φ−Φ_R)
+ EO (λ−λ_R) cos (Φ_R)) (1)
δ_I = 6.37H (NI (Φ−Φ_R)
+ EI (λ−λ_R) cos (Φ_R)) (2)
It becomes.
From this, the distance-dependent error δ due to the ionosphere and convection layer is
δ = δ_O− (120/154) δ_I (3)
It becomes.
From this, the new pseudo-range correction amount PRC ′ is
PRC ′ = PRC — 1−δ (4)
Can get more.

Next, a positioning method performed by the positioning system in the present embodiment will be described with reference to the flowchart shown in FIG.
The positioning method is a positioning method of a positioning system including the correction center server 410 and the portable electronic device 100 equipped with the position positioning device 200. The positioning method is a positioning step in which the position positioning device 200 measures the current position by GPS (step S11). ), A position transmission step (step S12) in which the portable electronic device 100 transmits the positioning position measured by the position positioning device 200 to the correction center server 410, and a pseudo distance for the correction center server 410 to correct the positioning position. A correction information transmitting step (step S13) for transmitting an ionospheric convective layer correction parameter including a correction amount and a surface correction parameter for calculating a distance-dependent error to the portable electronic device 100, and the portable electronic device 100 includes the ionospheric convective layer. The correction parameter and the surface correction parameter are received from the correction center server 410, and the received ionosphere convection layer is received. The correction information generation step (step S14) for generating a new pseudo distance correction amount based on the pseudo distance correction amount included in the positive parameter and the distance-dependent error calculated from the surface correction parameter, and the position positioning device 200 include a portable electronic device. The new pseudo distance correction amount generated by 100 is regarded as a normal pseudo distance correction amount, the pseudo distance is measured, the measured pseudo distance is corrected using the pseudo distance correction amount, the position is measured, and the position positioning data is generated. Then, a correction step (step S15) to be output is executed. After the correction process is completed, the process returns to the correction information transmission process.

  In the positioning step, normal positioning by GPS is performed. In the position transmission step, the current position data of the portable electronic device 100 for designating the electronic reference point 500 is transmitted. In the correction information transmission step, the correction center server 410 transmits the position data of the designated electronic reference point 500, the ionospheric convection correction parameter, and the surface correction parameter to the portable electronic device 100. The correction information generation step will be described in detail later. In the correction step, ionospheric convection layer correction and surface correction are performed using the new pseudo distance correction amount generated in the correction information generation step, and the position of the portable electronic device is determined.

  Each step described above includes positioning processing for positioning, position transmission processing for transmitting the positioning position determined by the positioning processing, correction information of the first method and correction information of the second method for correcting the positioning position, Correction information reception processing for receiving the correction information, and correction information generation processing for generating correction information for the third method based on the correction information for the first method and the correction information for the second method received in the correction information reception processing; The correction information of the third method generated in the correction information generation process is regarded as the correction information of the first method, and the positioning position is corrected based on the correction information of the first method to generate and output position positioning data. It is possible to cause the computer to execute a positioning program that performs correction processing.

  In the positioning program, the correction information transmission step described above is executed as a correction information reception process that is a process viewed from the side that receives the ionospheric convection layer correction parameter and the surface correction parameter.

Among the steps described above, the operations of the position transmission step and the correction information generation step performed by the positioning driver 110 of the portable electronic device 100 will be described in detail with reference to the flowchart shown in FIG.
The correction information communication unit 111, the correction information generation unit 112, the communication interface (I / F) unit 113, and the positioning result output interface (I / F) unit 114 of the positioning driver 110 operate in parallel with each other. Yes.

  The positioning driver 110 activates the map application execution unit 120 that displays the position measured by the GPS (step S100). After startup, the correction information communication unit 111 first checks whether or not it is connected to the correction center server 410 (step S101). If not connected (No in step S101), the correction information communication unit 111 connects to the correction center server 410 via the communication card 300 (step S102). If connected (Yes in step S101), the process proceeds to step S103 without performing step S102. The portable electronic device 100 is confirmed to be a valid portable electronic device by the authentication performed by the correction center 400 (step S103). Here, since the portable electronic device 100 is a legitimate device, the processing is continued as it is.

  In parallel with the processing by the correction information communication unit 111, the communication interface unit 113 first receives the positioning data by the single positioning from the position positioning device 200 after the activation, and the received positioning data is transmitted to the correction information communication unit 111 and the positioning result. The data is output to the output interface unit 114 (step S301). Step S301 is processing in which the communication interface unit 113 of the portable electronic device 100 receives the position data measured by the positioning device 200 in the positioning process. The positioning result output interface unit 114 sends the positioning data input from the communication interface unit 113 to the map application execution unit 120 (step S401).

  The communication interface unit 113 receives the positioning data from the positioning device 200 and outputs the received positioning data to the correction information communication unit 111 and the positioning result output interface unit 114 until FKP-DGPS is executed. Perform at intervals of seconds. Note that the data flow for notifying the correction information communication unit 111 of the positioning data received from the position positioning device 200 is not shown in FIG.

  The correction information communication unit 111 knows a rough current position (a position including an error) from the positioning data received from the communication interface unit 113, and transmits the rough current position to the correction center server 410 to obtain an electronic reference. A point 500 is designated (step S104). Step S <b> 104 is a position transmission process by the correction information communication unit 111 of the portable electronic device 100. The correction information communication unit 111 receives the position data of the designated electronic reference point 500, the ionospheric convection layer correction parameter, and the surface correction parameter from the correction center server 410 and outputs them to the correction information generation unit 112 (step S105). Step S105 is processing in which the correction information communication unit 111 of the portable electronic device 100 receives the ionospheric convection layer correction parameter and the surface correction parameter transmitted by the correction center server 410 in the correction information transmission step.

  The correction information generation unit 112 decodes the ionospheric convection layer correction parameter and the surface correction parameter input from the correction information communication unit 111 (step S201).

  At the same time, the communication interface unit 113 receives the FKP-DGPS positioning data that includes the pseudo-range correction amount and the distance-dependent error from the position positioning device 200, and outputs the positioning data to the correction information generation unit 112 (step S302). ). However, until the first new pseudo-range correction amount is generated in the correction information generation unit 112, the positioning data by the position positioning device 200 is not the positioning data corrected by FKP-DGPS, and is independent. This is positioning data by positioning. The positioning data obtained in step S302 is sent to the map application execution unit 120 via the positioning result output interface unit 114 (step S402).

  The correction information generation unit 112 receives the position data of the designated electronic reference point 500 input from the correction information communication unit 111, the ionospheric convection correction parameter and the surface correction parameter decoded in step S201, and the communication interface unit 113. Using the positioning data (positioning data transmitted by the communication interface unit 113 in step S302), a new pseudo distance correction amount PRC ′ is generated by the above-described algorithm (step S202). The correction information generation unit 112 encodes the generated new pseudo distance correction amount and then outputs it to the communication interface unit 113 (step S203).

  The communication interface unit 113 regards the new pseudo distance correction amount received from the correction information generation unit 112 as a normal pseudo distance correction amount and outputs the normal pseudo distance correction amount to the position measurement device 200 (step S303). As described above, steps S201 to S203, steps 302, 303, and 402 are the correction information generation process.

  The new pseudo distance correction amount input from the communication interface unit 113 by the position positioning device 200 is used for the next positioning (FKP-DGPS) by the position positioning device 200, and the obtained positioning data is sent to the communication interface unit 113. . This is a positioning process by the position positioning device 200.

  The communication interface unit 113 receives the positioning data from the position positioning device 200 as performed in step S302.

  After the pseudo distance correction amount is transmitted from the communication interface unit 113 to the positioning device 200 in step S303, the correction information communication unit 111 determines again whether or not the connection with the correction center server 410 is continued. (Step S106). If the connection is continued (Yes in step S106), the process returns to step S105 to continue positioning (FKP-DGPS) for correction. When the connection is not continued (No in step S106), the process returns to step S102 and the connection with the correction center server 410 is performed again.

  The operations of the position transmission process and the correction information generation process performed by the positioning driver 110 of the portable electronic device 100 have been described above.

  The correction information generation step described above is based on the correction information receiving process for receiving the correction information of the second method different from the correction information of the first method, and the correction information of the second method received in the correction information receiving process. Correction information generation processing for generating correction information of the third method, and correction information transmission processing for transmitting the correction information of the third method generated by the correction information generation processing as the correction information of the first method. The positioning driver program to be executed can be executed by a computer.

Next, the effect in this embodiment will be described.
According to this embodiment, a GPS receiver equipped with a general GPS LSI that has an algorithm for performing ionospheric convection correction but does not have an algorithm for surface correction. By inputting the distance-dependent error for performing surface correction as a data format of correction information for performing ionospheric convective layer correction together with a pseudo distance correction amount for performing ionospheric convective layer correction, the error in the distance between the GPS satellite and the positioning device Can be reduced as compared with the case where only ionospheric convection correction is performed, and as a result, the position can be specified more accurately than in the prior art.

  According to this embodiment, a portable electronic device having a positioning function for specifying a position more accurately can be realized by mounting a positioning driver.

  According to this embodiment, by using the positioning system, it is possible to specify the current position with higher accuracy in the portable electronic device than in the past.

  According to this embodiment, by executing the positioning method, the positioning system can specify the current position with higher accuracy than in the past.

  In this embodiment, the case where the surface correction is performed together with the ionospheric convection correction in the portable electronic device has been described. However, the present invention can be realized not only in the portable electronic device but also in a personal computer or a car navigation system.

As described above, the portable electronic device 100 described in the embodiment can be realized by a computer. FIG. 6 is a diagram illustrating a hardware configuration when the portable electronic device 100 according to the embodiment is realized by a computer.
In FIG. 6, the portable electronic device 100 includes a CPU (Central Processing Unit) 911 that executes a program. The CPU 911 is connected to a ROM (Read Only Memory) 913, a RAM (Random Access Memory) 914, a communication board 915, a display unit 901, and an input unit 902 via a bus 912.

  The RAM 914 is an example of a volatile memory. The ROM 913 is an example of a nonvolatile memory. These are examples of the storage unit.

  The communication board 915 is connected to a communication network such as a LAN or the Internet.

  The communication board 915 is connected to a LAN, the Internet, or a WAN (Wide Area Network) such as ISDN. When directly connected to a WAN such as the Internet or ISDN, the portable electronic device 100 is connected to a WAN such as the Internet or ISDN, and a web server is unnecessary.

  The storage unit 920 stores an operating system (OS) 921, a window system 922, a program group 923, and a file group 924. The program group 923 is executed by the CPU 911, the OS 921, and the window system 922.

  The functions described in the above description of the embodiment may be realized by firmware stored in the ROM 913. Alternatively, it may be implemented by software alone, hardware alone, a combination of software and hardware, or a combination of firmware.

It is a figure which shows the structure of the positioning system in this Embodiment. It is a figure which shows in detail the structure of the portable electronic device and correction | amendment center in this Embodiment. It is a figure which shows in detail the structure of the positioning driver in this Embodiment. It is a flowchart for demonstrating the positioning method performed with the positioning system in this Embodiment. It is a flowchart for demonstrating operation | movement of the positioning driver in this Embodiment. It is a figure which shows the structure at the time of implement | achieving the portable electronic device in this Embodiment with a computer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Portable electronic device, 110 Positioning driver, 111 Correction information communication part, 112 Correction information generation part, 113 Communication interface part, 114 Positioning result output interface part, 120 Map application execution part, 130 Map data storage part, 200 Position positioning device, 300 communication card, 400 correction center, 410 correction center server, 420 map server, 500 electronic reference point, 901 display unit, 911 CPU, 912 bus, 913 ROM, 914 RAM, 915 communication board, 920 storage unit, 921 OS, 922 Window system, 923 programs, 924 files.

Claims (10)

In a positioning driver that measures a position and corrects the measured position using correction information of the first method to generate position positioning data and outputs correction information of the first method
A correction information communication unit that receives correction information of a second method different from the correction information of the first method;
A correction information generating unit that generates correction information of the third method based on the correction information of the second method received by the correction information communication unit;
A positioning driver comprising: a communication interface unit that regards correction information of the third method generated by the correction information generation unit as correction information of the first method and transmits the correction information to the positioning device. The correction information communication unit receives the correction information of the first method and the correction information of the second method,
The correction information generation unit generates the correction information of the third method based on the correction information of the first method and the correction information of the second method received by the correction information communication unit. The positioning driver according to 1. The correction information communication unit receives the correction information of the ionospheric convection layer correction method as the correction information of the first method, receives the correction information of the surface correction method as the correction information of the second method,
The correction information generation unit uses the ionospheric convection correction method correction information as the third method correction information based on the ionospheric convection correction method correction information and the surface correction method correction information received by the correction information communication unit. The positioning driver according to claim 2, wherein the positioning driver is generated. The communication interface unit receives position positioning data from a position positioning device,
The correction information communication unit receives a first distance correction value as correction information of an ionospheric convection correction method, receives correction information of a surface correction method for calculating a second distance correction value,
The correction information generation unit calculates a second distance correction value based on the position indicated by the position measurement data received by the communication interface unit and the function received by the correction information communication unit, and the first distance correction value 4. The positioning driver according to claim 3, wherein the second distance correction value is added to obtain a third distance correction value, and the third distance correction value is used as correction information for an ionospheric convection layer correction method. The positioning driver is
The positioning driver according to claim 1, wherein the positioning driver is built in a portable electronic device. A correction center server that stores and provides correction information of the first method and correction information of the second method;
The correction information of the first method and the correction information of the second method are received from the correction center server, and based on the received correction information of the first method and the correction information of the second method, A portable electronic device that generates correction information;
A position positioning device that regards the correction information of the third method generated by the portable electronic device as the correction information of the first method, corrects the position obtained by positioning, and generates and outputs position positioning data; A positioning system. In a positioning method of a positioning system comprising a correction center server and a portable electronic device equipped with a positioning device,
A positioning process for positioning by the positioning device;
A position transmitting step in which the portable electronic device transmits the positioning position measured by the position positioning device to the correction center server;
A correction information transmitting step in which the correction center server transmits the correction information of the first method and the correction information of the second method for correcting the positioning position to the portable electronic device, and the portable electronic device has the first method The correction information and the correction information of the second method are received from the correction center server, and the correction information of the third method is generated based on the received correction information of the first method and the correction information of the second method. A correction information generation step;
The position positioning device regards the correction information of the third method generated by the mobile electronic device as the correction information of the first method, and corrects the position determined based on the correction information of the first method to obtain the position positioning data. And a correction step of generating and outputting the positioning method. The position is measured, the position corrected is corrected using the correction information of the first method, and the correction information of the first method is output to the position positioning device which generates the position positioning data, and the position is determined from the position measuring device. A positioning driver that inputs positioning data;
A map data storage unit for storing map data;
A map application execution unit for specifying a position indicated by position positioning data input from a position driver in a map generated using map data read from the map data storage unit;
The positioning driver is
A correction information communication unit that receives correction information of a second method different from the correction information of the first method;
A correction information generating unit that generates correction information of the third method based on the correction information of the second method received by the correction information communication unit;
A positioning terminal device comprising: a communication interface unit that regards correction information of the third method generated by the correction information generation unit as correction information of the first method and transmits the correction information to the positioning device. Correction information reception processing for receiving correction information of the second method different from the correction information of the first method;
A correction information generation process for generating correction information of the third method based on the correction information of the second method received in the correction information receiving process;
A positioning driver program that causes a computer to execute correction information transmission processing for transmitting the correction information of the third method generated in the correction information generation processing as the correction information of the first method. A positioning process for positioning;
A position transmission process for transmitting the positioning position determined by the positioning process;
A correction information receiving process for receiving correction information of the first method and correction information of the second method for correcting the positioning position;
A correction information generation process for generating correction information of the third method based on the correction information of the first method and the correction information of the second method received in the correction information receiving process;
The correction information of the third method generated in the correction information generation process is regarded as the correction information of the first method, and the position determined is corrected based on the correction information of the first method to generate and output position positioning data. A positioning program that causes a computer to execute correction processing.

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