JP4713369B2 - Position detection system - Google Patents

Description

  The present invention relates to a position detection system that detects the position of an operator and performs display control.

  Conventionally, it has been required to detect the position of a moving object and display the movement path of the object based on the detected position information, and various techniques applicable to various fields have been developed.

  For example, in Patent Document 1, an arithmetic processing unit as a route diagram creation unit creates a movement route of a transmitter, that is, an operator from a temporal change in the position of the transmitter, and displays a route diagram on a display screen of a display unit. A technique related to a work process analysis support system to be displayed is disclosed.

On the other hand, in Patent Document 2, the position of a display terminal device with a built-in GPS reception function is displayed by a character, and a positioning error circle, speed / A technique related to a mobile terminal device with a position display function for displaying a traveling direction arrow is disclosed.
JP 2002-73749 A JP 2003-215228 A

  However, in the above-described prior art, the display on the screen can be updated only at the timing when the position information is obtained, and therefore, the display of the current position of the object that is sequentially moved cannot be continuously changed. Furthermore, when the position detection accuracy is poor, display unnaturalness becomes more prominent.

  An object of the present invention is to unnaturally display the screen caused by position detection error by continuously changing the movement of the worker on the screen and limiting the movement speed in consideration of the position detection error. It is to make the movement of the worker look more natural.

In the first aspect of the present invention, the communication control unit that receives the current calculated position of the terminal from the position detection engine server, and the current calculated position and the current display position received by the communication control unit are displayed on the screen. If the movement distance obtained by the difference between the current calculated position and the obtained estimated position is larger than the position detection allowable error, the circumference of the error distribution circle centered on the current calculated position The point closest to the current display position above is set as the current estimated position, and if the movement distance is smaller than the position detection tolerance, the current calculated position and the current display position are internally divided at a predetermined ratio. There is provided an application server characterized by having a control unit that makes a point the current estimated position and prompts the monitoring terminal to display the estimated position on the screen.

According to a second aspect of the present invention, in the first aspect, the control unit further divides the interval from the current display position to the current estimated position into a predetermined number, and sets each screen refresh rate on the monitoring terminal side. An application server characterized in that the screen is smoothly displayed is provided .

  In the third aspect of the present invention, a communication control unit for communicating with the monitoring terminal and the position detection engine server, and at least a position information acquisition function and a calculation function are provided. Means for obtaining the current calculated position of the operator and determining the estimated position on the screen from the current calculated position and the current display position of the worker by the above calculation function, and means for determining the estimated position Determining whether the moving distance calculated by the difference between the current display position and the estimated position on the screen is larger than the position detection allowable error, and if the moving distance is larger than the position detection allowable error It is urged to move on the screen by a distance obtained by subtracting the length of the position detection allowable error from the movement distance. On the other hand, if the movement distance is smaller than the position detection allowable error, Encourage the user to move on the screen by half the distance or a distance that internally divides the movement distance by a predetermined ratio, and calculate the movement speed of the worker from the current display position of the worker and the previously determined estimated position. The first processing and the current display position of the worker are acquired by the position information acquisition function, the moving speed of the worker is calculated by the calculation function, and the current display position of the worker and the movement of the worker are calculated. A control unit that performs a second process of calculating a latest screen display position from the speed and urging updating of the screen display of the monitoring screen on the monitoring terminal side based on the calculation result. A position detection system is provided.

  In the fourth aspect of the present invention, a communication control unit for communicating with the position detection engine server via the AP server, and at least a position information acquisition function and a calculation function are provided. A means for obtaining the current calculated position of the worker and determining the estimated position on the screen from the current calculated position and the current display position of the worker by the above calculation function, and determining the estimated position Means for determining whether or not a movement distance calculated by a difference between the current display position and the estimated position on the screen is larger than the position detection allowable error, and the movement distance is larger than the position detection allowable error. In this case, it is urged to move on the screen by a distance obtained by subtracting the length of the position detection allowable error from the movement distance, while the movement distance is smaller than the position detection allowable error. Is urged to move on the screen by a distance that is half the movement distance or a distance that internally divides the movement distance by a predetermined ratio, and the movement of the worker from the worker's current display position and the previously determined estimated position. The first process of calculating the speed, the current display position of the worker is acquired by the position information acquisition function, the moving speed of the worker is calculated by the calculation function, and the current display position of the worker is calculated. A control unit that executes a second process that calculates the latest screen display position from the movement speed of the operator and prompts the user to update the screen display of the monitoring screen on the monitoring terminal side based on the calculation result; A position detection system characterized by being provided in a monitoring terminal is provided.

  According to the present invention, by continuously changing the movement of the worker on the screen and limiting the movement speed in consideration of the position detection error, unnatural screen display due to the position detection error is suppressed, It is possible to provide a position detection system that makes the movement of the worker more natural.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a configuration of a position detection system according to an embodiment of the present invention.

  As shown in FIG. 1, in the position detection system, wireless LAN portable terminals 4 a, 4 b... Carried by workers are transferred to the management center side via a plurality of access points 8 a, 8 b,. It is possible to communicate with various arranged servers. On the management center side, a Web / application (hereinafter abbreviated as AP) server 1, a database (hereinafter abbreviated as DB) server 2, a monitoring terminal 3, a location management server 5, and a first location detection engine server 6. The second position detection engine server 7 is disposed at least.

  .., And a plurality of wireless LAN mobile terminals 4a, 4b... Are collectively referred to as numerals 8 and 4, respectively.

  In such a configuration, the access point 8 is a radio wave relay that connects the wireless LAN portable terminal 4 and the communication network 9 via a wireless LAN. For example, the access point 8 and a wireless LAN adapter (not shown) of each wireless LAN portable terminal 4 are assigned an identification name ESSID, and the access point 8 relays communication between terminals having the same ESSID as itself. To do. As the wireless LAN portable terminal 4, for example, a PDA or a cellular phone having a wireless LAN communication function can be adopted.

  On the other hand, the position management server 5 and the first position detection engine server 6 are servers on which position detection software using the propagation speed of the wireless LAN operates. The second position detection engine server 7 is a server on which position detection software for specifying a position based on the radio wave intensity of the wireless LAN operates. The DB server 2 and the Web / AP server 1 are servers that manage / store the position data calculated by the position detection software. The monitoring terminal 3 is a terminal that appropriately reads out the position data stored in the DB server 2 and displays the screen.

  Here, in FIG. 2, a part of the configuration of FIG. 1 is further embodied and described in more detail.

  As shown in FIG. 2, the Web / AP server 1 includes at least a communication control unit 11 and a control unit 12. The communication control unit 11 controls communication with each server and terminal, and the control unit 12 controls the entire Web / AP server 1.

  More specifically, the control unit 12 includes at least a position information acquisition function 12a, a Web service function 12b, a calculation function 12c, and a main control function 12d. The position information acquisition function 12a is a function for acquiring position information detected by the first and second position detection engine servers 6 and 7. The web service function 12b is a function for providing a web service to the monitoring terminal 3 or the like. The calculation function 12c is a function for performing calculation for continuously displaying the movement of the target worker or the like based on the position information. The main control function 12d is responsible for other controls.

  On the other hand, the DB server 2 includes at least a communication control unit 23, a control unit 21, and a terminal state data DB 22. The location information sent from the Web / AP server 1 is received by the communication control unit 23 and stored in the terminal state data DB 22 under the control of the control unit 21. In the terminal state data DB 22, as shown in FIG. 3, the terminal ID, the position X (m), the position Y (m), and the state are stored in association with each other. The “terminal ID” is an ID for identifying the terminal carried by the worker, and the “position X” is the current calculated position of the terminal calculated by the position detection software (hereinafter referred to as “current calculated position”). The “position Y” is the Y coordinate of the current calculated position of the terminal, and the “state” indicates whether or not the position is being detected.

  Under the above configuration, the control unit 12 obtains the moving speed of the worker from the difference between the current calculated positions X and Y of the worker and the display position on the screen by the calculation function 12c. The display position on the next screen is estimated from the moving speed, and control is performed so that the display position is updated at finer time intervals, thereby continuously moving the worker on the monitoring screen of the Web browser of the monitoring terminal 3. show. When calculating the movement speed of the worker, the movement speed of the worker displayed on the screen is limited in consideration of the position detection error of the position detection software. By continuously changing the movement of the worker on the screen in this way, the movement of the worker looks more natural. In addition, since the movement speed is limited in consideration of the position detection error, unnatural movement due to the position detection error can be suppressed on the screen.

  Hereinafter, this display control will be described in more detail with reference to FIGS.

  The points of display control by the position detection system according to the present embodiment are as follows.

  That is, first, when the difference between the current calculated position and the current display position is larger than the position detection allowable error by the position detection software (referred to as an error allowed by the position detection system or position detection software). The point closest to the current display position on the circumference of the error distribution circle is controlled to be displayed on the screen as the current estimated position. Second, if the difference between the current calculated position and the current display position is smaller than the position detection tolerance by the position detection software, the midpoint between the current display position and the current calculated position (or p: q) Control is performed so that the screen is displayed with the internally divided point) as the current estimated position. Third, when the screen is displayed, control is performed so that the current display position to the current estimated position is divided into n, and the screen is displayed smoothly at each screen refresh rate (for example, every 1/12 seconds). To do.

  And in order to make an operator's movement look smooth like this, in the position detection system concerning this embodiment, in display control, the 1st processing and the 2nd processing are performed in parallel.

In the first process, acquisition of the current calculated position of the worker from the position detection software and calculation of the movement speed of the worker are executed. In the second process, the display position on the screen is estimated from the movement speed of the worker calculated in the first process, and the worker's display position on the screen is shorter than the interval for executing the first process. By updating, the movement of the worker is shown smoothly.

  Hereinafter, the processing procedure of the first processing will be described in detail with reference to the flowchart of FIG. Here, FIGS. 6A and 6B are referred to as appropriate.

  When entering the first process, the control unit 12 counts the timer Ta based on the main control function 12d (step S1), and when the Ta has elapsed, the position information acquisition function 12a causes the first and second position detection engine servers. The current calculated position (Xnew, Ynew) of the worker is obtained from 6 and 7 (step S2). That is, in the first process, calculation is performed every Ta time.

  Subsequently, the control unit 12 determines an estimated position (Xe, Ye) on the screen from the current display position (Xs, Ys) of the worker and the current calculated position (Xnew, Ynew) by the calculation function 12c. (Step S3). Here, the movement distance is limited so that the position of the worker on the screen does not move more than the actual movement distance due to the position detection error of the position detection software.

  Subsequently, it is determined whether or not the moving distance is larger than the position detection allowable error (de) (step S4).

As a result, as shown in FIG. 6A, when the movement distance is larger than the position detection tolerance (de) of the position detection software, the length of the error is calculated from the movement distance calculated by the position detection software. It is moved on the screen by the drawn distance (step S5).
Xe = Xnew- (Xnew-Xs) de / R
Ye = Ynew- (Ynew-Ys) de / R
Here, R = {(Xnew−Xs) ² + (Ynew−Ys) ² } ^1/2 .

  On the other hand, as shown in FIG. 6 (b), when the movement distance is smaller than the position detection tolerance (de) of the position detection software, only half the movement distance calculated by the position detection software is displayed on the screen. (Step S6).

Xe = (Xs + Xnew) / 2
Ye = (Ys + Ynew) / 2
The estimated position (Xe, Ye) may be a point that internally divides the two points (Xs, Ys) and (Xnew, Ynew) into p: q.

  Thus, the control unit 12 calculates the movement speed (Vx, Vy) of the worker from the current display position of the worker and the previously determined estimated position by the calculation function 12c (step S7).

Vx = (Xe-Xs) / Ta
Vy = (Ye-Ys) / Ta
Here, Ta is the execution interval of process 1 (for example, 1 s).

  Thus, the first process is finished.

  Next, the processing procedure of the second process will be described in detail with reference to the flowchart of FIG. In the second process, the control unit 12 measures the timer Tb based on the main control function 12d (step S11). Tb is, for example, 1/12 s. That is, in the present embodiment, the second process is executed at a time interval shorter than that of the first process.

  When the time Tb elapses in this way, the control unit 12 acquires the worker's current display position (Xs, Ys) and the worker's moving speed (Vx, Vy) by the position information acquisition function 12a (step S12). The latest screen display position (X, Y) is calculated from the operator's current display position (Xs, Ys) and the worker's moving speed (Vx, Vy) by the calculation function 12c (step S13).

X = Xs + Vx × Tb
Y = Ys + Vy × Tb
In this way, control is performed to prompt the updating of the screen display of the monitoring screen on the monitoring terminal 3 side based on the calculation result (step S14), and the second process is terminated.

  According to the first and second processes described above, display control as shown in FIG. 7 is realized.

  That is, as shown in FIGS. 7A and 7B, in the prior art, even if a person actually moves straight, it does not seem to move straight due to errors in the position detection software. (As indicated by the bold line in the figure).

  On the other hand, as shown in FIG. 7C, according to the present embodiment, the movement of the person due to the position detection software error can be suppressed, and by reducing the screen information display interval, It is possible to display smoothly.

  The embodiment of the present invention has been described above, but the present invention is not limited to this, and various improvements and modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, various servers are physically distributed. However, it is of course possible to execute processing after logically dividing the processing by a smaller number of servers. is there.

  Further, the functions equivalent to the position information acquisition function 12a, the calculation function 12c, and the main control function 12d in the Web / AP server 1 in FIG. 2 are placed in the control unit 32 of the monitoring terminal 3 in FIG. It is good also as a form which arrange | positions as the information acquisition function 32a, the calculation function 32c, and the main control function 32d, and performs the process after the positional information acquisition shown in FIG. 4 and FIG. By doing so, it is possible to omit the installation of the Web service function 12b that was in the Web / AP server 1. In FIG. 8, the communication control unit 31 is connected to the communication control unit 11 of the Web / AP server 1, but the communication control unit 31 is not limited to this, and the DB server 2 The communication control unit 23 may be accessed.

1 is a configuration diagram of a position detection system according to an embodiment of the present invention. FIG. 2 is a diagram further illustrating the configuration of FIG. 1. It is a figure which shows an example of the memory content of terminal status data DB22. It is a flowchart which shows the process sequence of the 1st process performed by the control part 12 of the position detection system which concerns on one embodiment of this invention. It is a flowchart which shows the process sequence of the 2nd process performed by the control part 12 of the position detection system which concerns on one embodiment of this invention. It is a conceptual diagram for supplementarily explaining the processing procedure of the first processing. It is an example of a display by the position detection system concerning one embodiment of the present invention. FIG. 3 is a diagram that further embodies the configuration of FIG. 1 and shows an example of a form different from FIG. 2.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Web / AP server, 2 ... DB server, 3 ... Monitoring terminal, 4 ... Wireless LAN portable terminal, 5 ... Location management server, 6 ... 1st location detection engine server, 7 ... 2nd location detection engine server, 8 ... Access point, 9 ... Communication network, 11 ... Communication control unit, 12/32 ... Control unit, 12a / 32a ... Location information acquisition function, 12b ... Web service function, 12c / 32c ... Calculation function, 12d / 32d ... Main Control function, 21 ... control unit, 22 ... terminal state data DB, 23 · 31 ... communication control unit.

Claims (4)

A communication control unit for receiving the current calculated position of the terminal from the position detection engine server ;
The estimated position on the screen is obtained from the current calculated position and the current display position received by the communication control unit, and the movement distance obtained by the difference between the current calculated position and the obtained estimated position is the position. If it is larger than the detection tolerance, the point closest to the current display position on the circumference of the error distribution circle centered on the current calculation position is the current estimated position, and the movement distance is smaller than the position detection tolerance Is a point that internally divides between the current calculated position and the current display position at a predetermined ratio as the current estimated position , a control unit that prompts the monitoring terminal to display the estimated position on the screen,
An application server comprising: 2. The control unit according to claim 1, wherein the control unit further divides the interval from the current display position to the current estimated position into a predetermined number, and smoothly displays the screen for each screen refresh rate on the monitoring terminal side. The application server described. A communication control unit for communicating with the monitoring terminal and the position detection engine server;
At least a position information acquisition function and a calculation function are provided, and the current calculation position of the worker is acquired from the position detection engine server by the position information acquisition function, and the worker's current calculation position and current display are acquired by the calculation function. Means for determining an estimated position on the screen from the position, and the means for determining the estimated position is based on a position detection allowable error based on the movement distance calculated by the difference between the current display position and the estimated position on the screen. If the moving distance is larger than the position detection allowable error, it is urged to move on the screen by a distance obtained by subtracting the length of the position detection allowable error from the moving distance, When the moving distance is smaller than the position detection tolerance, the user is prompted to move the screen by a distance that is half the moving distance or a distance that internally divides the moving distance by a predetermined ratio. Calculating the movement speed of the worker from the current display position of the worker and the estimated position determined in advance, acquiring the current display position of the worker by the first process and the position information acquisition function, and calculating the calculation The function calculates the movement speed of the worker, calculates the latest screen display position from the current display position of the worker and the movement speed of the worker, and the screen of the monitoring screen on the monitoring terminal side based on the calculation result A control unit that executes a second process that prompts updating of the display;
A position detection system comprising: A communication control unit for communicating with the position detection engine server via the AP server;
It has at least a position information acquisition function and a calculation function, and acquires the current calculation position of the worker of the position detection engine server by this position information acquisition function. Means for determining an estimated position on the screen from the display position, and the means for determining the estimated position is such that the movement distance calculated by the difference between the current display position and the estimated position on the screen is the position detection allowance. It is determined whether or not it is larger than the error, and when the moving distance is larger than the position detection allowable error, it is urged to move on the screen by a distance obtained by subtracting the length of the position detection allowable error from the moving distance. On the other hand, when the moving distance is smaller than the position detection tolerance, the moving distance is moved on the screen by a distance that is half the moving distance or a distance that internally divides the moving distance by a predetermined ratio. Prompting and calculating the worker's current display position by the first processing and the position information acquisition function, wherein the worker's current display position and the estimated position previously determined are calculated. With the above calculation function, the movement speed of the worker is calculated, the latest screen display position is calculated from the current display position of the worker and the movement speed of the worker, and the screen display of the monitoring screen is calculated based on the calculation result. A control unit that executes a second process that prompts an update;
A position detection system comprising a monitoring terminal.

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