JP2012173210A - Wireless terminal apparatus and positioning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless terminal apparatus and a positioning method capable of improving TTFF performance when specific auxiliary information for positioning processing by a GPS is not acquired from a base station.SOLUTION: A cellular phone 1 includes: a storage part 70 for storing Almanac data and the coordinates of a plurality of reference points arranged in each country; a country information acquisition part 31 for acquiring a country code from a position-registered base station; a reference point acquisition part 32 for acquiring the coordinates of reference points of a counter in which the base station exists based on the country code; a visible satellite calculation part 33 for calculating visible satellites in respective reference points based on the Almanac data, the position information of the reference points and present time; and a positioning processing part 34 for preferentially trying capture of a visible satellite by increasing the priority of a visible satellite shared by more reference points out of the calculated visible satellites.

Description

  The present invention relates to a wireless terminal device and a positioning method for capturing a visible satellite based on a navigation message received from a GPS satellite and performing a positioning calculation.

  Conventionally, a wireless terminal apparatus performs a positioning process using GPS (Global Positioning System) in order to acquire current position information. This positioning process includes an Assisted system or a Based system that receives auxiliary information for capturing radio waves from a GPS satellite from a base station, and a Standalone system that does not acquire auxiliary information from a base station.

  In the case of the standard system, the wireless terminal device does not communicate with the base station for positioning, and acquires a navigation message (Almanac data and Ephemeris data) transmitted from a GPS satellite. Further, the wireless terminal device captures a GPS satellite based on the received navigation message and performs a positioning calculation by itself. As described above, in the case of the Standardone method, since the process of calculating and capturing the visible satellite is necessary at the first positioning after the wireless terminal device is activated, the positioning result can be obtained as compared with the continuous positioning after the satellite supplementation. It takes a long time to complete. The time until the first positioning result is obtained is called TTFF (Time To First Fix).

  However, if the wireless terminal device has performed positioning processing in the past and location information, time information, and navigation messages are stored, GPS satellites can be captured faster than when these pieces of information are newly acquired. , TTFF performance is improved. However, when starting positioning after moving a long distance, such as from within the country, even if the navigation message used last time is stored, the GPS satellite is moved based on the position information before moving far from the current position. In order to search, the estimated position of the GPS satellite is greatly different from the actual position, and it takes a long time to capture.

  In such a situation, in order to improve the TTFF performance, a system that receives visible satellite information and base station position information from a base station and searches for GPS satellites at high speed based on the received information has been proposed. (For example, refer to Patent Document 1).

Japanese Patent No. 3576268

  However, the system of Patent Document 1 is based on the premise that the wireless terminal device performs data communication with the base station. Therefore, it takes time to establish communication and data processing, and the usage cost may increase. Furthermore, for example, when the wireless terminal device moves outside a country where a similar service is not provided, data may not be received from the base station, and the TTFF performance may not be improved.

  An object of this invention is to provide the radio | wireless terminal apparatus and positioning method which can improve TTFF performance, when the special auxiliary information for the positioning process by GPS is not acquired from a base station.

  A wireless terminal device according to the present invention includes a GPS receiving unit that receives a signal transmitted from a GPS satellite, and a positioning processing unit that performs a positioning calculation by capturing a visible satellite based on a navigation message received from the GPS satellite. A wireless terminal device comprising: a storage unit that stores at least GPS satellite orbit information in the navigation message; and a plurality of reference point position information provided for each country; The country information acquisition unit that acquires the country identification information of the country where the base station is located, and the reference in the country where the base station is located from the storage unit based on the country identification information acquired by the country information acquisition unit Based on the reference point acquisition unit that acquires the position information of the point, the trajectory information, the position information of the reference point acquired by the reference point acquisition unit, and the current time, A visible satellite calculation unit that calculates a visible satellite at each quasi-point, and the positioning processing unit gives priority to a visible satellite that is common to more reference points among the visible satellites calculated by the visible satellite calculation unit. Increase the degree and try to capture with priority.

  Preferably, the GPS receiving unit has a multi-channel receiving circuit, and the positioning processing unit assigns more channels to the higher-priority visible satellite group.

  Further, when the positioning processing unit captures a GPS satellite that is not included in the visible satellites at the first reference point, the priority of the visible satellites at the second reference point that uses the captured GPS satellite as one of the visible satellites. Is preferably higher than the priority of the visible satellites at the first reference point.

  In addition, when the positioning processing unit captures GPS satellites that are not included in the visible satellites at any reference point, it is preferable to cancel the priority and try to capture all GPS satellites.

  Further, the country information acquisition unit further acquires area identification information indicating an area in the country where the base station is located from the registered base station, and the storage unit is associated with the area identification information, When the positioning calculation result by the positioning processing unit is stored as the position information of the reference point of the area, the reference point acquiring unit is acquired by the country information acquiring unit the area identification information stored in the storage unit It is preferable that the position information of the reference point associated with the area identification information is acquired instead of the position information of the reference point stored in the storage unit.

  Further, when the country information acquisition unit acquires the same country identification information as the previous positioning by the country information acquisition unit, the reference point acquisition unit stores the previous positioning result as position information of the reference point in the storage unit. It is preferable to obtain it instead of the position information of the reference point.

  A positioning method according to the present invention is a positioning method for performing a positioning calculation by capturing a visible satellite based on a navigation message received from a GPS satellite by a wireless terminal device, wherein at least GPS satellite orbit information in the navigation message, And a step of storing a plurality of reference points provided for each country, a country information acquisition step of acquiring country identification information of the country where the base station is located from the registered base station, and the country Based on the country identification information acquired in the information acquisition step, a reference point acquisition step for acquiring position information of the reference point in the country where the base station is located stored in the storage step, and the trajectory information And at each reference point based on the position information and the current time of the reference point acquired in the reference point acquisition step. A visible satellite calculating step for calculating a visible satellite, and a positioning processing step for increasing the priority of the visible satellites that are common to more reference points among the visible satellites calculated in the visible satellite calculating step and attempting to acquire them with priority. And including.

  ADVANTAGE OF THE INVENTION According to this invention, when a radio terminal device does not acquire special auxiliary information for positioning processing by GPS from a base station, TTFF performance can be improved.

1 is an external perspective view of a mobile phone according to an embodiment of the present invention. It is a block diagram which shows the function of the mobile telephone which concerns on embodiment of this invention. It is a figure which shows the country information table which concerns on embodiment of this invention. It is a figure which shows the area information table which concerns on embodiment of this invention. It is a figure which shows the example which grouped the GPS satellite which concerns on embodiment of this invention. It is a figure which shows the example of the allocation of the channel which concerns on embodiment of this invention. It is a figure which shows the example of the reallocation of the channel which concerns on embodiment of this invention. It is a 1st flowchart which shows the process at the time of the initial positioning which concerns on embodiment of this invention. It is a 2nd flowchart which shows the process at the time of the initial positioning which concerns on embodiment of this invention. It is a 3rd flowchart which shows the process at the time of the initial positioning which concerns on embodiment of this invention.

  Hereinafter, an example of a preferred embodiment of the present invention will be described. In the present embodiment, a mobile phone 1 will be described as an example of a wireless terminal device.

FIG. 1 is an external perspective view of a mobile phone 1 according to the present embodiment.
FIG. 1 shows a so-called foldable mobile phone, but the mobile phone according to the present invention is not limited to this. For example, a sliding type in which one casing is slid in one direction from a state in which both casings are overlapped, or a rotary type in which one casing is rotated around an axis along the overlapping direction ( Turn type), or a type (straight type) in which the operation unit and the display unit are arranged in one housing and does not have a connecting unit.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 includes an operation unit 11 on the front surface unit 10 and a microphone 12 to which a voice uttered by a user of the mobile phone 1 during a call or when using a voice recognition application is input. The The operation unit 11 includes a function setting operation button 13 for activating various functions such as various setting functions, a telephone book function, and a mail function, and an input operation button 14 for inputting numbers of telephone numbers, mail characters, and the like. , And a determination operation button 15 for performing determination and scrolling in various operations.

  The display unit side body 3 includes a display unit 21 for displaying various types of information on the surface unit 20 and a receiver 22 for outputting the voice of the other party of the call.

  Further, the upper end portion of the operation unit side body 2 and the lower end portion of the display unit side body 3 are connected via a hinge mechanism 4. In addition, the mobile phone 1 relatively rotates the operation unit side body 2 and the display unit side body 3 which are connected via the hinge mechanism 4, so that the operation unit side body 2 and the display unit side body 3 are rotated. The body 3 can be in an open state (open state), or the operation unit side body 2 and the display unit side body 3 can be folded (closed state).

FIG. 2 is a block diagram showing functions of the mobile phone 1 according to the present embodiment.
The mobile phone 1 includes an operation unit 11, a display unit 21, a control unit 30, a communication unit 40, a GPS reception unit 50, a voice control unit 60, and a storage unit 70.

  The control unit 30 controls the entire mobile phone 1 and performs predetermined control on each unit such as the display unit 21 and the communication unit 40, for example. In addition, the control unit 30 receives input from the operation unit 11, the communication unit 40, the GPS reception unit 50, and the like, and executes various processes. And the control part 30 controls the memory | storage part 70 in the case of a process execution, reads various programs and data, and writes data. Detailed functions of the control unit 30 according to the present embodiment will be described later.

  The communication unit 40 communicates with an external device (base station) in a predetermined use frequency band (for example, 2 GHz band, 800 MHz band, etc.). Then, the communication unit 40 demodulates the signal received from the main antenna 41, supplies the processed signal to the control unit 30, modulates the signal supplied from the control unit 30, and outputs the signal from the main antenna 41. Send to external device.

  The GPS receiving unit 50 demodulates a radio signal of a predetermined frequency band from a GPS satellite received by the GPS antenna 51 and supplies the processed signal to the control unit 30. The functions of the GPS receiving unit 50 and the GPS antenna 51 may be performed by the communication unit 40 and the main antenna 41, respectively.

  In addition, the GPS receiver 50 includes a plurality of channels of receiving circuits, and by allocating a plurality of GPS satellites to different channels, the GPS satellites are captured in parallel and receive signals. Hereinafter, the GPS receiving unit 50 will be described as having 12 channels.

  The sound control unit 60 performs predetermined sound processing on the signal supplied from the communication unit 40 under the control of the control unit 30, and outputs the processed signal to the receiver 22. The receiver 22 outputs the signal supplied from the audio control unit 60 to the outside. This signal may be output from a speaker (not shown) instead of the receiver 22 or together with the receiver 22. In addition, the voice control unit 60 processes the signal input from the microphone 12 according to the control of the control unit 30, and outputs the processed signal to the communication unit 40. The communication unit 40 performs predetermined processing on the signal supplied from the voice control unit 60 and outputs the processed signal from the main antenna 41.

  The storage unit 70 includes, for example, a working memory and is used for arithmetic processing by the control unit 30. In addition to the various programs according to the present embodiment, at least Almanac data, which is orbit information of GPS satellites among navigation messages used for positioning, position information and time information, a country information table, an area information table, and a visible satellite list which will be described later. Memorize etc.

FIG. 3 is a diagram showing a country information table stored in the storage unit 70 according to the present embodiment.
In the country information table, coordinates represented by latitude and longitude are stored as position information of a plurality of reference points provided for each country in association with the country code (country identification information). Specifically, it is preferable that two reference points (reference point A and reference point B) are provided in each country, and two reference points are provided near both ends of the longest straight distance in the territory of each country.

FIG. 4 is a diagram showing an area information table stored in the storage unit 70 according to the present embodiment.
In the area information table, coordinates represented by latitude and longitude are stored as position information of one reference point for each country code and area code (area identification information). Here, the area code is data for identifying an area in which the country is subdivided, for example, a prefecture or a state. In the initial state, the area code or coordinates need not be stored. When an area code is acquired by a country information acquisition unit 31 to be described later, the positioning calculation result by the positioning processing unit 34 is stored as the coordinates of the reference point of the area in association with the area code.

Next, the function of the control unit 30 will be described in detail.
The control unit 30 includes a country information acquisition unit 31, a reference point acquisition unit 32, a visible satellite calculation unit 33, and a positioning processing unit 34.

  The country information acquisition unit 31 acquires the country code of the country in which the base station is located, based on the notification information from the base station where the location of the mobile phone 1 is registered. At this time, the country information acquisition unit 31 may further acquire an area code indicating a domestic area in which the base station is located from broadcast information from the base station.

  The reference point acquisition unit 32 acquires the coordinates of the reference point corresponding to the country code from the country information table stored in the storage unit 70 based on the country code acquired by the country information acquisition unit 31.

  In addition, when the area code already stored in the area information table (FIG. 4) is acquired by the country information acquisition unit 31, the reference point acquisition unit 32 coordinates the reference point associated with the area code. Is obtained instead of the coordinates of the reference point stored in the country information table (FIG. 3).

  Furthermore, when the country information acquisition unit 31 acquires the same country code as the previous positioning, the reference point acquisition unit 32 uses the previous positioning result as the coordinates of the reference point and uses the country information table (FIG. 3) and the area. Obtained instead of the coordinates of the reference point stored in the information table (FIG. 4).

  The visible satellite calculation unit 33 calculates a visible satellite at each reference point based on the Almanac data, the coordinates of the reference point acquired by the reference point acquisition unit 32, and the current time. The visible satellite calculation unit 33 groups all GPS satellites into satellites that can be seen from a plurality of reference points, satellites that can be seen only from a single reference point, and satellites that cannot be seen from any reference point.

  FIG. 5 is a diagram illustrating an example in which the GPS satellites according to the present embodiment are grouped based on the visibility from two reference points in a certain country.

  The 32 GPS satellites G01 to G32 are a group A of GPS satellites visible only from the reference point A, a group B of GPS satellites visible only from the reference point B, a group C of GPS satellites visible from the reference points A and B, It is classified into a group D of GPS satellites that cannot be seen from any reference point.

  The positioning processing unit 34 captures a visible satellite based on a navigation message received from a GPS satellite via the GPS receiving unit 50 and performs a positioning calculation. At this time, the positioning processing unit 34 increases the priority of the visible satellites that are common to more reference points among the visible satellites calculated by the visible satellite calculation unit 33, and tries to acquire them with priority. That is, when two reference points are provided for each country, first, a search for a GPS satellite (group C) calculated as a visible satellite common to both reference points is given priority. Second, priority is given to searching for GPS satellites (group A and group B) calculated as visible satellites of only one reference point.

  Specifically, the positioning processing unit 34 assigns a higher priority group of visible satellites to more channels in the GPS receiving unit 50. That is, the most channels are assigned to the group C in FIG. 5, then the number of assignments decreases in the order of group A and group B, and finally group D.

  FIG. 6 is a diagram illustrating an example of channel assignment in the GPS receiving unit 50 according to the present embodiment.

  Group C is a visible satellite that can be seen in common from two reference points, and is most likely to be captured from any point in the country, so it is given the highest priority, and 6 of the 12 channels are assigned.

  Group A and group B are useful because they can be captured depending on the position of the mobile phone 1, and if they can be captured, the position of the mobile phone 1 can be narrowed down. Therefore, two channels are allocated to the group A and the group B, which are fewer than the allocation to the group C.

  Group D is less likely to be captured than Groups A, B, and C, but the remaining two channels are allocated assuming that the country code and time information obtained from the base station are incorrect.

  Further, when the positioning processing unit 34 searches for GPS according to the assignment of FIG. 6 and acquires a GPS satellite that is not included in the visible satellites at the first reference point, the positioning processing unit 34 uses the captured GPS satellites as one of the visible satellites. The priority of the visible satellite at the second reference point is higher than the priority of the visible satellite at the first reference point. Specifically, the positioning processing unit 34 increases the priority of the group A over the group B when the GPS satellite of the group A is captured, and the group A when the GPS satellite of the group B is captured. Channel B is reassigned with a higher priority of group B.

  FIG. 7 is a diagram illustrating an example of channel reallocation according to the present embodiment. In this example, a GPS satellite of group A is acquired.

  Since the mobile phone 1 is determined to be closer to the reference point A than the reference point B due to the acquisition of the GPS satellites of the group A, the positioning processing unit 34 uses the channel of the group B with a low possibility of acquisition. Release the assignment. Further, since the possibility of capturing the GPS satellites of the group D that cannot be seen from the reference point A is reduced, the positioning processing unit 34 reduces the two channels assigned to the group D to one channel, and as a result, the group A Are assigned 5 channels.

  In addition, since the positioning processing unit 34 captures a GPS satellite that is not included in any visible satellite at any reference point, it is highly possible that the calculated visible satellite is not actually visible. And try to capture all GPS satellites. Specifically, when the positioning processor 34 acquires the GPS satellites of the group D, the positioning processor 34 assigns all the GPS satellites to the respective channels in a predetermined order regardless of the classification of the groups A, B, C, and D.

  8 to 10 are flowcharts showing processing at the time of initial positioning in the mobile phone 1 according to the present embodiment.

  In step S1 of FIG. 8, the country information acquisition unit 31 acquires the base station information including the country code when the location registration is performed with respect to the base station when the power is turned on or when returning from the outside of the radio wave range. To do.

  In step S2, the control unit 30 determines the type of information acquired in step S1. If the country code is acquired but the area code is not acquired, the process proceeds to step S3. If the country code and the area code are acquired, the process proceeds to step S22 (FIG. 10).

  In step S3, the control unit 30 determines whether or not the acquired country code is the same as the country code at the time of the previous positioning. If this determination is YES, the previous positioning information is available, so the process moves to step S14 (FIG. 9). If the determination is NO, the process moves to step S4.

  In step S4, the reference point acquisition unit 32 determines whether or not the reference point corresponding to the acquired country code is in the country information table (FIG. 3). If this determination is YES, the process proceeds to step S5, and if the determination is NO, a visible satellite cannot be calculated based on the stored Almanac data, so the process proceeds to step S15 (FIG. 9).

  In step S5, the reference point acquisition unit 32 acquires the coordinates of the reference points A and B corresponding to the acquired country code from the country information table (FIG. 3).

  In step S6, the visible satellite calculation unit 33 calculates the visible satellites of the reference points A and B acquired in step S5.

  In step S7, the positioning processor 34 groups the visible satellites calculated in step S6, and determines channel assignment in the GPS receiver 50 as shown in FIG. 6 according to the priority for each group.

  In step S8, the positioning processing unit 34 searches for a GPS satellite according to the channel assignment determined in step S7.

  In step S9, the positioning processing unit 34 determines whether a GPS satellite has not been found for 15 minutes or longer. If this determination is YES, the process proceeds to step S12, and if the determination is NO, the process proceeds to step S10.

  In step S10, the positioning processing unit 34 determines the group of GPS satellites that have been found. If a GPS satellite that can be seen in common is found from the reference points A and B, the process proceeds to step S13. If a GPS satellite that is visible only from one of the reference points A or B is found, the process proceeds to step S11. If a GPS satellite other than a visible satellite that is not visible from the reference point A or B is found, the process proceeds to step S12.

  In step S <b> 11, the positioning processing unit 34 increases the priority of the visible satellite at the reference point where the found GPS satellite is present, and reassigns the channel in the GPS receiving unit 50.

  In step S12, the positioning processing unit 34 performs channel reassignment in the GPS receiving unit 50 for all satellites.

  In step S13, the positioning processing unit 34 determines whether or not the positioning is successful. If this determination is YES, the process ends. If the determination is NO, the process returns to step S8. If the number of captured GPS satellites is less than 4 and insufficient, if all the GPS satellites that are prioritized (except group D) are not attempted to be captured, the determination is NO and the process proceeds to step S8. Return.

  In step S14 of FIG. 9, the positioning processing unit 34 determines whether information (navigation message, position information, time information) necessary for positioning is stored. If this determination is YES, the process proceeds to step S18, and if the determination is NO, the process proceeds to step S15.

  In step S15, the positioning processing unit 34 starts positioning by cold start for capturing a GPS satellite by decoding a signal from the GPS satellite and newly acquiring a navigation message.

  In step S16, the positioning processor 34 searches for all GPS satellites.

  In step S17, the positioning processing unit 34 determines whether the positioning is successful. If this determination is YES, the process ends. If the determination is NO, the process returns to step S16.

  In step S18, the positioning processing unit 34 determines that the previous positioning information is available because the mobile phone 1 is located in the same country as the previous positioning, and calculates a visible satellite based on the positioning information. (Warm start or hot start).

  In step S19, the positioning processing unit 34 searches for the visible satellite calculated in step S18.

  In step S20, the positioning processing unit 34 determines whether a GPS satellite has not been found for 15 minutes or more. If this determination is YES, the positioning processing unit 34 determines that the previous positioning information cannot be used, and the process proceeds to step S15. If the determination is NO, the process proceeds to step S21.

  In step S21, the positioning processing unit 34 determines whether the positioning is successful. If this determination is YES, the process ends. If the determination is NO, the process returns to step S19.

  In step S22 of FIG. 10, the reference point acquisition unit 32 determines whether or not the reference point corresponding to the acquired country code and area code is in the area information table (FIG. 4). If this determination is YES, the process proceeds to step S23, and if the determination is NO, the area reference point cannot be acquired, so the process proceeds to step S3 (FIG. 8).

  In step S23, the visible satellite calculation unit 33 calculates the visible satellite at the reference point acquired in step S22 corresponding to the area code.

  In step S24, the positioning processing unit 34 preferentially assigns GPS satellites having a high elevation angle to the channels of the GPS receiving unit 50 among the visible satellites calculated in step S23. At this time, if a channel is vacant, the vacant channel is assigned to a GPS satellite other than the visible satellite.

  In step S25, the positioning processing unit 34 searches for a GPS satellite according to the channel assignment determined in step S24.

  In step S26, the positioning processing unit 34 determines whether a GPS satellite has not been found for 15 minutes or longer. If this determination is YES, the positioning processing unit 34 determines that there is an error in the calculated visible satellite, and the process proceeds to step S28. If the determination is NO, the process proceeds to step S27.

  In step S27, the positioning processor 34 determines whether the found GPS satellite is the visible satellite calculated in step S23. If this determination is YES, the process proceeds to step S29. If the determination is NO, the positioning processing unit 34 determines that there is an error in the calculated visible satellite, and the process proceeds to step S28.

  In step S28, the positioning processing unit 34 starts positioning by cold start for capturing the GPS satellite by decoding the signal from the GPS satellite and newly acquiring a navigation message.

  In step S29, the positioning processing unit 34 determines whether or not the positioning is successful. If this determination is YES, the process proceeds to step S30, and if the determination is NO, the process returns to step S25.

  In step S30, the control unit 30 associates the coordinates of the positioning result with the area code and stores them in the area information table (FIG. 4). Note that the control unit 30 may store the coordinates in the area information table when it is determined that four or more satellites have been successfully acquired and the reliability of the positioning result is high.

As described above, according to the present embodiment, the mobile phone 1 can calculate the visible satellite based on the coordinates of the reference point corresponding to the country code acquired from the base station if the Almanac data is stored. The TTFF performance in the Standardone method can be improved.
Further, a plurality of reference points (for example, two) are provided for each country, and the mobile phone 1 tries to acquire more preferentially the visible satellites common to more reference points. Can be captured efficiently, and the TTFF performance can be improved.

  Further, when the mobile phone 1 has a reception circuit with a plurality of channels, the priority can be easily set according to the number of channels to be assigned.

  In addition, since the mobile phone 1 can reset the priority of each group according to the group that includes the GPS satellites that are actually captured, the probability of successful capture can be increased while searching for GPS satellites. it can.

  In addition, when the area code can be acquired from the base station, the mobile phone 1 stores the positioning result as a reference point, so that the next time the same area code is received, Based on this, a visible satellite can be calculated with high accuracy.

  In addition, if the country code received from the base station is the same as the previous positioning, the mobile phone 1 tries to acquire a GPS satellite using the previous positioning information, so select an efficient method according to the situation. This improves the TTFF performance and reduces the processing load.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

  The wireless terminal device according to the present invention is not limited to the mobile phone 1. The present invention can be applied to various devices such as a PHS (registered trademark), a personal digital assistant (PDA), a game machine, a navigation device, and a personal computer.

1 Mobile phone (wireless terminal device)
DESCRIPTION OF SYMBOLS 11 Operation part 21 Display part 30 Control part 31 Country information acquisition part 32 Reference | standard point acquisition part 33 Visible satellite calculation part 34 Positioning process part 40 Communication part 41 Main antenna 50 GPS receiving part 51 GPS antenna 60 Voice control part 70 Storage part

Claims (7)

A wireless terminal device having a GPS receiving unit that receives a signal transmitted from a GPS satellite, and a positioning processing unit that captures a visible satellite based on a navigation message received from the GPS satellite and performs a positioning calculation,
A storage unit for storing at least GPS satellite orbit information in the navigation message and a plurality of reference point position information provided for each country;
A country information acquisition unit that acquires country identification information of the country in which the base station is located from the registered base station;
Based on the country identification information acquired by the country information acquisition unit, a reference point acquisition unit that acquires position information of the reference point in the country where the base station is located from the storage unit;
Based on the orbit information, the position information of the reference point acquired by the reference point acquisition unit and the current time, a visible satellite calculation unit that calculates a visible satellite at each of the reference points, and
The positioning processing unit is a wireless terminal device that increases the priority of visible satellites that are common to more reference points among the visible satellites calculated by the visible satellite calculation unit, and tries to acquire them with priority. The GPS receiver has a multi-channel receiving circuit,
The wireless terminal device according to claim 1, wherein the positioning processing unit assigns more channels to the visible satellite group having the higher priority.   When the positioning processor captures a GPS satellite not included in the visible satellite at the first reference point, the priority of the visible satellite at the second reference point, where the captured GPS satellite is one of the visible satellites, The wireless terminal device according to claim 1, wherein the wireless terminal device has a higher priority than a visible satellite at the first reference point.   4. The positioning processing unit according to claim 1, wherein when the GPS processing unit captures a GPS satellite that is not included in any visible satellites at any reference point, the positioning processing unit cancels the priority and tries to capture all the GPS satellites. 5. The radio | wireless terminal apparatus of any one. The country information acquisition unit further acquires area identification information indicating an area in the country where the base station is located from the registered base station,
The storage unit is associated with the area identification information, stores a positioning calculation result by the positioning processing unit as position information of a reference point of the area,
When the area identification information stored in the storage unit is acquired by the country information acquisition unit, the reference point acquisition unit stores position information of the reference point associated with the area identification information in the storage unit. The radio | wireless terminal apparatus of any one of Claims 1-4 acquired instead of the positional information on the memorize | stored reference | standard point.   When the country information acquisition unit acquires the same country identification information as the previous positioning by the country information acquisition unit, the reference point acquisition unit stores the previous positioning result as position information of the reference point in the storage unit. The radio | wireless terminal apparatus in any one of Claims 1-5 acquired instead of the positional information on a reference | standard point. A positioning method for performing a positioning calculation by capturing a visible satellite based on a navigation message received from a GPS satellite by a wireless terminal device,
A storage step of storing at least GPS satellite orbit information in the navigation message and a plurality of reference point position information provided for each country;
A country information acquisition step of acquiring country identification information of the country in which the base station is located from the base station where the location is registered;
Based on the country identification information acquired in the country information acquisition step, a reference point acquisition step of acquiring position information of the reference point in the country where the base station is stored stored in the storage step;
Based on the orbit information, the position information of the reference point acquired in the reference point acquisition step and the current time, a visible satellite calculation step for calculating a visible satellite at each of the reference points;
A positioning method comprising: a positioning processing step in which, among visible satellites calculated in the visible satellite calculating step, a priority is given to a visible satellite that is common to more reference points, and the acquisition is preferentially attempted for acquisition.

Images