JP2012026847A - Gnss reception monitor program, and gnss reception monitor apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a GNSS reception monitor in which reception status other than a signal level can also be confirmed and the reception status can be more easily grasped.SOLUTION: A GPS reception monitor program displays a reception status display screen 30 on a display device of a computer. The reception status display screen 30 displays a sky plot display section 31, a signal level display section 32, a positioning result display section 33 and a correlation graph display section 34 side by side. The sky plot display section 31 displays a position of each GPS satellite. The signal level display section 32 displays a level of a signal received from each GPS satellite. The positioning result display section 33 displays a result of positioning based on signals received from at least a part of GPS satellites. The correlation graph display section 34 displays a correlation graph obtained by plotting a correlation value between the signal from each GPS satellite and a replica code with respect to a frequency and a phase of the replica code.

Description

  The present invention mainly relates to a GNSS reception monitoring program for monitoring the reception status of a GNSS receiver. Specifically, the present invention relates to the contents displayed on the screen of the GNSS reception monitor apparatus by the GNSS reception monitor program.

  There is known a GNSS receiver that performs positioning and the like by receiving signals from a plurality of GNSS (Global Navigation Satellite System) satellites. When evaluating the performance of the GNSS receiver, a program called a GNSS reception monitor is used. That is, by connecting the GNSS receiver to the computer and executing the GNSS reception monitor program, the reception status of the GNSS receiver is displayed on the computer screen.

  An operator who evaluates the performance of the GNSS receiver can check the reception status displayed on the screen (the level of the signal received from each GNSS satellite by the GNSS receiver). Therefore, if there is a deviation from the actual coordinates as a result of positioning by the GNSS receiver (when positioning accuracy is poor), is the positioning performed using a signal with a low signal level? Etc. can be investigated.

  A method for using such a monitor program is described in Non-Patent Document 1, for example.

"Serial GPS Navigation (48) Using Akizuki's USB Connected GPS Module (3)", [online], January 7, 2009, CQ Publishing Co., Ltd., Electronic Work Promotion Magazine Electric Jack, [Heisei 22 Search May 17, 2009], Internet <URL: http: //www.eleki-jack.com/KitsandKids2/2009/01/gps48usbgps3.html>

  By the way, in the conventional GNSS reception monitor, the magnitude of the signal level can only be examined as a cause grasp when the positioning position is shifted. However, in reality, the positioning position may be shifted even though a signal having a high signal level is used. In such a case, the conventional GNSS reception monitor cannot sufficiently investigate the cause of the displacement of the positioning position.

  Moreover, in the conventional GNSS reception monitor, only confirmation of the reception status of one GNSS receiver has been considered. Therefore, it is impossible to simultaneously check the reception status of a plurality of types of GNSS receivers and compare the performance of the plurality of GNSS receivers.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a GNSS reception monitor that can confirm a reception status other than the signal level and can easily recognize the reception status. Another object of the present invention is to provide a GNSS reception monitor capable of easily comparing the reception statuses of a plurality of GNSS receivers.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, there is provided a GNSS reception monitor program for displaying on a GNSS reception monitor device the reception status of signals received by a GNSS receiver from a plurality of GNSS satellites, and the following GNSS reception monitor program is provided. Provided. That is, the GNSS reception monitor program displays a reception status display screen on a display device included in the GNSS reception monitor device. The reception status display screen displays at least one of a sky plot display unit or a signal level display unit and a correlation graph display unit side by side. The sky plot display unit displays the position of each GNSS satellite. The signal level display unit displays the level of a signal received from each GNSS satellite. The correlation graph display unit displays a correlation graph in which a correlation value between a signal received from at least one GNSS satellite and a replica code is plotted with respect to the frequency or code phase of the replica code.

  Thus, by displaying the correlation graph, the correlation characteristics of signals from each GNSS satellite can be grasped. Then, by displaying this correlation graph and information (satellite position or signal level) indicating the state of each GNSS satellite side by side, it becomes possible to easily compare the state of each satellite and the correlation characteristics. As a result, for example, when a positional deviation occurs, in addition to the information indicating the state of the GNSS satellite, the correlation characteristics of the signal received from the GNSS satellite can be referred to. Can grasp.

  The GNSS reception monitor program preferably displays a positioning result display unit on the display device together with at least one of the sky plot display unit and the signal level display unit, and a correlation graph display unit. The positioning result display unit displays positioning results based on signals received from at least some of the GNSS satellites.

  Thus, by displaying the positioning result in addition to the information indicating the state of each GNSS satellite and the correlation graph, it becomes possible to easily compare the information and correlation characteristics regarding each GNSS satellite and the positioning result. .

  When the operation for selecting a specific GNSS satellite is performed, the GNSS reception monitoring program is selected in the sky plot display unit or the signal level display unit and the correlation graph display unit. Preferably, information about GNSS satellites is highlighted.

  Thus, when a GNSS satellite is selected, information about the signal from the selected GNSS satellite is highlighted, so that in each of the sky plot, signal level, and correlation graph, from the selected GNSS satellite. Information about the signal can be easily identified. This makes it easy to compare the sky plot, signal level, and correlation graph content for signals from the selected GNSS satellite with each other.

  When the operation for selecting a specific GNSS satellite is performed, the correlation graph display unit preferably enlarges and displays the correlation graph related to the selected GNSS satellite.

  Thereby, the correlation graph of the signal received from the selected GNSS satellite can be confirmed in detail.

  The GNSS reception monitor program has a reception mode indicating whether a signal received from each GNSS satellite is being acquired or synchronized, on at least one of the sky plot display unit and the signal level display unit. It is preferable to display information.

  Thereby, it is possible to grasp in more detail the reception status of signals from each GNSS satellite.

  The GNSS reception monitor program is displayed as information on GNSS satellites used for positioning and information on GNSS satellites not used for positioning in at least one of the sky plot display unit and the signal level display unit. It is preferable to vary the method.

  As a result, it is possible to easily grasp which signal is used for positioning. For example, when a displacement occurs in the positioning result, it is possible to appropriately grasp the cause of the displacement of the positioning.

  Preferably, the GNSS reception monitor program displays symbols indicating the position of each GNSS satellite in the sky plot display unit, and displays a leader line from the symbol to display additional information regarding each GNSS satellite. .

  Thereby, it is possible to grasp in more detail the reception status of signals from each GNSS satellite.

  The GNSS reception monitoring program is preferably capable of displaying the reception status display screens for different GNSS receivers side by side on the display device.

  Thus, by displaying the reception statuses of a plurality of GNSS receivers side by side, the plurality of GNSS receivers can be easily compared.

  When the setting related to screen display is changed in any one of the reception status display screens displayed side by side, the GNSS reception monitor program changes the settings of all reception status display screens. It is preferable to change to the same setting as the changed setting.

  Thus, since the display settings of a plurality of reception status display screens can be synchronized, the information displayed on the plurality of reception status display screens can be easily compared. That is, the reception status of each GNSS receiver can be easily compared.

  When the operation for changing the setting of the orientation of the sky plot display unit displayed on any one of the reception status display screens displayed side by side is performed, the GNSS reception monitor program is all It is preferable to change the setting of the orientation of the sky plot display unit displayed on the reception status display screen to the same setting as the changed setting.

  Thereby, since the setting of the direction of the sky plot in each reception status display screen can be synchronized, it is possible to easily visually recognize the layout of the GNSS satellites received by each GNSS receiver.

  The GNSS reception monitoring program performs an operation to change the setting of the display scale or display range of the positioning result display unit displayed on any one of the reception status display screens displayed side by side. Then, it is preferable to change the setting of the display scale or display range of the positioning result display unit displayed on all the reception status display screens to the same setting as the changed setting.

  Thereby, since the display scale or display range of the positioning result in each reception status display screen can be synchronized, it is possible to easily compare the positioning position by each GNSS receiver.

  When the operation for selecting a specific GNSS satellite is performed on any one of the reception status display screens displayed side by side, the GNSS reception monitor program is displayed on all reception status display screens. Preferably, the information regarding the selected GNSS satellite is highlighted.

  Thereby, the information regarding the selected GNSS satellite can be easily identified on each reception status display screen. Therefore, it is possible to easily compare signals from the selected GNSS satellite among a plurality of reception status display screens.

  According to a second aspect of the present invention, there is provided a GNSS reception monitor apparatus configured to display the reception status of signals received by a GNSS receiver from a plurality of GNSS satellites, and having the following configuration. That is, the GNSS reception monitoring device includes a display device. The display device displays a reception status display screen in which at least one of a sky plot display unit or a signal level display unit and a correlation graph display unit are arranged. The sky plot display unit displays the position of each GNSS satellite. The signal level display unit displays the level of a signal received from each GNSS satellite. The correlation graph display unit displays a correlation graph in which a correlation value between a signal received from at least one GNSS satellite and a replica code is plotted with respect to the frequency and phase of the replica code.

  Thus, by displaying the correlation graph, the correlation characteristics of signals from each GNSS satellite can be grasped. Then, by displaying this correlation graph and information (satellite position or signal level) indicating the state of each GNSS satellite side by side, it becomes possible to easily compare the state of each satellite and the correlation characteristics. As a result, for example, when a positional deviation occurs, in addition to the information indicating the state of the GNSS satellite, the correlation characteristics of the signal received from the GNSS satellite can be referred to. Can grasp.

  The GNSS reception monitoring device is preferably capable of displaying the reception status display screens for different GNSS receivers side by side on the display device.

  Thus, by displaying the reception statuses of a plurality of GNSS receivers side by side, the plurality of GNSS receivers can be easily compared.

The figure which shows the whole structure of a GPS receiving monitor apparatus. The figure which shows the example of the reception status display screen displayed on the display apparatus. The figure which shows a mode that the display setting part was displayed. The figure explaining a correlation graph. The figure which shows a mode when the information regarding a specific satellite is selected. The figure which shows a mode that several GPS receiver was connected to the GPS receiving monitor apparatus. The figure which shows a mode when a some reception status display screen is displayed side by side.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which the reception status of a GPS receiver (GNSS receiver) 3 is monitored using a GPS reception monitor device (GNSS reception monitor device) 1 according to the present embodiment.

  A GPS antenna 2 is attached to the GPS receiver 3. The GPS antenna 2 receives signals from a plurality of GPS (Global Positioning System) satellites, and performs positioning using the received signals. The GPS receiver 3 is configured to output the positioning result and the reception status of signals from each GPS satellite to the GPS reception monitoring device 1.

  The GPS reception monitor device 1 includes hardware configured as a general personal computer (PC) and software such as a GPS reception monitor program (GNSS reception monitor program) installed in a storage device included in the PC. ing. Then, the hardware and software cooperate to allow the PC to function as the GPS reception monitor device 1.

  The GPS reception monitor device 1 includes a display device 10 including a liquid crystal display and an input device 13 including a keyboard 11 and a mouse 12. When the information output by the GPS receiver 3 is input to the GPS reception monitor device 1, processing according to the GPS reception monitor program is executed, and the reception status of the GPS receiver 3 is displayed on the display device 10. Thereby, the operator of the GPS reception monitoring device 1 can confirm the reception status of the GPS receiver 3 by looking at the display on the display device 10. In addition, the operator of the GPS reception monitor apparatus 1 can give an appropriate instruction to the GPS reception monitor apparatus 1 by appropriately operating the input device 13.

  Next, a reception status display screen displayed on the display device 10 of the GPS reception monitor device 1 will be described. The GPS reception monitor program is set to generate a reception status display screen based on the acquired information and display it on the display device 10 when the positioning result and reception status of the GPS receiver 3 are acquired. The GPS reception monitor program updates the reception status display screen every time a positioning result and a reception status are newly acquired from the GPS receiver 3. That is, the GPS reception monitoring device 1 of the present embodiment is a real-time monitoring device. But even if it is the structure which updates a reception status display screen after acquiring a new reception status several times, it can be said that it is still a real-time monitoring device.

  An example of the reception status display screen displayed on the display device 10 is shown in FIG. As shown in FIG. 2, the reception status display screen 30 includes a sky plot display unit 31, a signal level display unit 32, a positioning result display unit 33, and a correlation graph display unit 34 in one screen. They are displayed side by side.

  The positioning result display unit 33 displays the positioning result of the GPS receiver. Specifically, the positioning result display unit 33 includes a positioning information display unit 35 and a positioning history display unit 36. The positioning information display unit 35 displays the current time, positioning state, speed, altitude, direction, and the like. In FIG. 2, “single positioning” is displayed as the positioning state, but “DGPS” or the like is displayed when positioning is performed by differential GPS, for example. If radio waves from a sufficient number of satellites cannot be received and positioning has not been performed, “unpositioned” or the like is displayed. The direction is the moving direction of the GPS antenna 2.

  In the positioning history display unit 36, the history of positioning results by the GPS receiver 3 is plotted and displayed on a two-dimensional plane. That is, the locus of the GPS antenna 2 on the two-dimensional plane is displayed. The vertical axis of the positioning history display unit 36 indicates latitude, and the horizontal axis indicates longitude.

  For example, when the GPS antenna 2 is fixed, if the positioning is accurate, the positioning result plotted on the positioning history display unit 36 should not move from the first point. Therefore, when the positioning result plotted on the positioning history display unit 36 is moving, it can be seen that the positioning result is deviated from the actual position (positioning accuracy by the GPS receiver 3 is poor).

  In addition, for example, when positioning is performed while the GPS antenna 2, the GPS receiver 3, and the GPS reception monitor device 1 are mounted on a vehicle and moving, the locus of movement of the vehicle is displayed on the positioning history display unit 36. The In this case, if a map is displayed on the positioning history display unit 36 and overlapped with the map and the positioning result is plotted, it can be determined whether or not the positioning result exists on the road. it can. And when the plotted position has shifted | deviated from on the road, it turns out that the precision of positioning is bad.

  As described above, the positioning accuracy of the GPS receiver 3 can be evaluated by checking the results plotted on the positioning history display unit 36.

  The positioning result display unit 33 includes a display switching tab 37. By switching the display switching tab 37, either the positioning information display unit 35 or the display setting unit 38 is selected. It is configured to display. FIG. 3 shows a state where the display setting tab 38 is displayed by switching the display switching tab 37. The user appropriately inputs the range of the vertical axis (latitude) and the range of the horizontal axis (longitude) of the positioning history display unit 36 to the display range input field 45 provided in the display setting unit 38, thereby positioning history. The range of the two-dimensional plane displayed on the display unit 36 can be set. Thereby, for example, only the positioning history in the desired area can be enlarged and displayed, so that the positioning result can be appropriately evaluated. Although the range of the vertical axis and the horizontal axis is input, for example, a scale (display scale) for displaying on the positioning history display unit 36 may be input.

  In addition to the case where the user designates the display range of the positioning history display unit 36 as described above, automatic scaling for automatically setting the display range can also be designated. To enable this automatic scaling function, the user checks the automatic scaling check box 46. When the automatic scaling function is enabled, the minimum display scale that can accommodate all plot points of the positioning result history is automatically set in the positioning history display unit 36. As a result, the display area of the positioning history display unit 36 can be effectively used to the maximum, and all plots can be displayed at once.

  The signal level display unit 32 displays the signal level of the signal from each GPS satellite received by the GPS receiver 3 as a bar graph. The GPS receiver 3 of the present embodiment has 16 reception channels, and can receive signals from a maximum of 16 GPS satellites. Therefore, a maximum of 16 bar graphs can be displayed on the signal level display section. The channels are assigned numbers from 0 to 15. Below the bar graph, the satellite number (SV) of the GPS satellite receiving the signal in each channel is displayed. Thereby, it is possible to easily grasp from which satellite each channel indicates a signal.

  Among the signals received from the GPS satellites, there are signals that are not suitable for use in positioning, such as a low signal level or a low correlation value with the replica code. Therefore, not all signals received from GPS satellites are used for positioning. Therefore, in order to easily identify the signal level of the signal used for positioning and the signal level of the signal not used for positioning, a bar graph indicating the signal level of the signal used for positioning, and The display method differs depending on the bar graph indicating the signal level of the unused signal. Specifically, the bar graph indicating the signal level of the signal used for positioning and the bar graph indicating the signal level of the signal not used for positioning are displayed in different colors (the color difference is represented by hatching in the drawing). is doing).

  Moreover, the positioning mode of each channel is displayed under each bar graph. Here, the positioning mode indicates whether each channel is acquiring synchronization or tracking, and it is “complement” if synchronization is being acquired, “add” if synchronization is being tracked, etc. Is displayed. By displaying the positioning mode in this way, it is possible to grasp the positioning status in more detail.

  The sky plot display unit 31 displays the position of the GPS satellite in the sky. The position of each GPS satellite is indicated by the position of the symbol 40 in which the satellite number is written. Even if the GPS satellite is present in the sky, if the signal level of the signal from the satellite is low or the correlation value between the signal and the replica is low, the signal from the GPS satellite is It may not be used for positioning. Therefore, the display method is different between the GPS satellite symbol 40 not used for positioning and the GPS satellite symbol 40 used for positioning. Specifically, the GPS satellite symbol 40 that is not used for positioning and the GPS satellite symbol 40 that is used for positioning are displayed in different colors, similar to the color coding of the bar graph in the signal level display section 32. Thereby, it is possible to easily grasp at which position the positioning is performed based on the signal from the GPS satellite.

  Further, a lead line is displayed on the symbol 40 of each GPS satellite, and additional information can be displayed at the end of the lead line. Specifically, a leader line check box 41 is displayed in the sky plot display portion, and when a user checks the leader line check box 41, a leader line is displayed on the symbol 40 of each GPS satellite. Thus, additional information is displayed at the tip of the lead line. The user can select what information is displayed as the additional information by selecting one of the additional information selection radio buttons 42. In this embodiment, as the additional information, the carrier-to-noise ratio (C / N0) of the signal from each GPS satellite, the positioning mode (Mode) of each GPS satellite, the azimuth (Azi), the elevation angle (Elev), the channel number ( ChNo) and correlation value (Corr) can be selected.

  The sky plot display unit 31 can set the azimuth as to which azimuth is to be displayed upward when displaying the position of the GPS satellite. Specifically, when the user checks the north reference check box 43, the position of the GPS satellite is displayed with the upper direction on the screen facing north (north up). On the other hand, for example, when positioning is performed by mounting a GPS antenna on an automobile, it may be desired to confirm the position of the GPS satellite with reference to the traveling direction of the automobile. In such a case, by clearing the north reference check box 43, the position of the GPS satellite is displayed so that the upper direction of the screen corresponds to the traveling direction of the mobile object equipped with the GPS antenna (heading up) ).

  As described above, the signal level of each GPS satellite and the position of each GPS satellite are displayed on one screen at the same time. Since the signal level of the satellite being used can be examined, the cause of the deviation can be grasped. That is, for example, it can be immediately grasped that positioning is performed using a signal having a low signal level. In this case, it can be determined that the signal having the low signal level is the cause of the displacement of the positioning result.

  In addition, it can be said that the signal level display part 32 and the sky plot display part 31 are displaying similar information in that both display information indicating the state of the GPS satellite that received the signal. . Therefore, the sky plot display unit 31 and the signal level display unit 32 may be configured to display only one of them. In this case, the user may be able to select which of the sky plot display unit 31 and the signal level display unit 32 is displayed.

  By the way, even if a signal with a high signal level is used, the positioning position may be shifted. Accordingly, it is necessary to display information that can grasp the positioning situation in addition to the comparison of the signal level.

  Therefore, the GPS reception monitor program of the present embodiment displays the correlation graph display unit 34 in addition to the above display. Thereby, as shown in FIG. 2, the sky plot display part 31, the signal level display part 32, the positioning result display part 33, and the correlation graph display part 34 are displayed side by side in one screen.

  As shown in FIG. 2, the correlation graph display unit 34 displays a correlation graph of signals received by each channel. As shown in FIG. 4, this correlation graph three-dimensionally depicts the relationship between the correlation value between the replica code and the carrier of the signal received from the GPS satellite, the frequency of the replica code, and the code phase of the replica code. It is a graph.

  In FIG. 2 and the like, correlation graphs are displayed for all channels (0ch to 15ch), but it is not necessary to display correlation graphs for all channels in this way. For example, only the correlation graph of the channel used for positioning may be displayed. Thus, if the number of channels for displaying the correlation graph is limited, a space for displaying the correlation graph can be provided and the correlation graph can be displayed in a large size, so that the correlation graph is easy to see.

  Here, when the GPS satellite can be normally captured or tracked, the correlation graph has a clean conical shape like the correlation graph of the first channel (Ch1) in FIG. On the other hand, when the GPS satellite cannot be normally captured or tracked (for example, when an interfering wave or the like is received), the correlation graph is distorted as in the correlation graph of the fifth channel (Ch5) in FIG. The shape will be. In this way, by looking at the shape of the correlation graph, it can be determined whether or not the GPS satellite has been normally tracked or captured.

  In this embodiment, the correlation graph display unit 34 is displayed along with the sky plot display unit 31, the signal level display unit 32, and the positioning result display unit 33 in one screen (reception status display screen 30). Therefore, the display contents can be compared with each other. As a result, when a displacement occurs in the positioning result, the display contents can be compared and judged in a composite manner, and the cause of the displacement can be examined.

  For example, when a displacement occurs in the positioning position, the signal level display unit 32 and the correlation graph display unit 34 are compared, and whether the correlation graph of each channel has a distorted shape in addition to the magnitude of the signal level. That is, it is possible to determine whether or not positioning is performed using an unnecessary signal such as an interference wave.

  In addition, if the sky plot display unit 31 and the correlation graph display unit 34 are compared and the correlation graph obtained from a plurality of satellites in the north direction has similar distortions, those signals are in the south direction. It can be determined that the building is reflecting (multipath). In this case, if a map is displayed on the positioning history display unit 36, it is confirmed whether or not a large building that causes the multipath actually exists in the south direction by looking at the map. You can also.

  Moreover, in the GPS reception monitor program of this embodiment, in order to facilitate the mutual comparison of the sky plot display unit 31, the signal level display unit 32, and the correlation graph display unit 34 as described above, the user performs an appropriate operation. When a specific GPS satellite is selected, information on the selected GPS satellite is highlighted on the sky plot display unit 31, the signal level display unit 32, and the correlation graph display unit 34.

  For example, it is assumed that the user operates the mouse 12 and performs a click operation after the mouse pointer is overlaid on the number 24 GPS satellite symbol displayed in the sky plot display unit 31. In this case, the 24th GPS satellite is selected by the user. Then, as shown in FIG. 5, the symbol of the 24th GPS satellite is highlighted. On the plane of FIG. 5, the thickness of the line is increased as an expression for highlighting the symbol. However, the present invention is not limited to this. The symbol can be emphasized by an appropriate method.

  Further, the signal of the 24th GPS satellite is received by the twelfth channel in the example of FIG. Accordingly, the bar graph of the signal level of the twelfth channel is highlighted on the signal level display unit 32, and the correlation graph of the twelfth channel (Ch12) is highlighted on the correlation graph display unit 34 (see FIG. 5). The method of highlighting the signal level bar graph and the correlation graph is not limited to the example of FIG. 5, and can be highlighted by an appropriate method such as displaying a mark indicating that the signal level has been selected.

  Similarly, when the bar graph of the signal level display unit 32 is selected or when the correlation graph of the correlation graph display unit 34 is selected, the sky plot display unit 31, the signal level display unit 32, and the correlation graph display unit are displayed. At 34, information about the selected GPS satellite is highlighted.

  As described above, by highlighting information on the selected GPS satellite, information is compared with each other on the three display units (sky plot display unit 31, signal level display unit 32, correlation graph display unit 34). Becomes easier. A plurality of GPS satellites may be selected at the same time.

  Another method for highlighting the correlation graph when a GPS satellite is selected is to display only the correlation graph of the channel corresponding to the selected GPS satellite, and the channel corresponding to the GPS satellite that has not been selected. The correlation graph may not be displayed. In this way, by not displaying the correlation graph relating to the unselected GPS satellites, there is room in the drawing area of the correlation graph display unit 34, so that the correlation graph relating to the selected GPS satellites can be displayed greatly enlarged. In this case, since the correlation graph regarding the selected GPS satellite can be confirmed in detail, it is particularly preferable.

  As described above, the GPS reception monitor program of the present embodiment displays the reception status display screen 30 on the display device 10 included in the GPS reception monitor device 1 configured as a personal computer. The reception status display screen 30 displays a sky plot display unit 31, a signal level display unit 32, and a correlation graph display unit 34 side by side. The sky plot display unit 31 displays the position of each GPS satellite. The signal level display unit 32 displays the level of the signal received from each GPS satellite. The correlation graph display unit 34 displays a correlation graph in which the correlation value between the signal received from each GPS satellite and the replica code is plotted with respect to the frequency and phase of the replica code.

  Thus, by displaying the correlation graph, the correlation characteristics of the signals from each GPS satellite can be grasped. The correlation graph and information (satellite position and signal level) indicating the status of each GPS satellite are displayed side by side so that the status of each satellite can be easily compared with the correlation characteristics. Become. As a result, for example, when there is a deviation in positioning, it is possible to refer to correlation characteristics of signals received from the GPS satellite in addition to information indicating the state of the GPS satellite. Can grasp.

  In addition, the GPS reception monitor program of this embodiment displays the positioning result display unit 33 on the display device 10 together with the sky plot display unit 31, the signal level display unit 32, and the correlation graph display unit 34. The positioning result display unit 33 displays positioning results based on signals received from at least some of the GPS satellites.

  Thus, by displaying the positioning result in addition to the information indicating the state of each GPS satellite and the correlation graph, it becomes possible to easily compare the information and correlation characteristics regarding each GPS satellite with the positioning result. .

  In addition, when an operation for selecting a specific GPS satellite is performed, the GPS reception monitor program of the present embodiment causes the selected GPS to be selected in the sky plot display unit 31, the signal level display unit 32, and the correlation graph display unit 34. Highlight information about the satellite.

  Thus, when a GPS satellite is selected, information about the signal from the selected GPS satellite is highlighted, so that in each of the sky plot, signal level, and correlation graph, from the selected GPS satellite. Information about the signal can be easily identified. This makes it easy to compare the contents of the sky plot, signal level, and correlation graph with respect to the signal from the selected GPS satellite.

  In the GPS reception monitor program of this embodiment, when an operation for selecting a specific GPS satellite is performed, it is more preferable that the correlation graph regarding the selected GPS satellite is enlarged and displayed on the correlation graph display unit 34. .

  Thereby, the correlation graph of the signal received from the selected GPS satellite can be confirmed in detail.

  In addition, the GPS reception monitor program of this embodiment causes the signal level display unit 32 to display reception mode information indicating whether a signal received from each GPS satellite is being acquired or synchronized.

  As a result, the reception status of signals from the respective GPS satellites can be grasped in more detail.

  In addition, the GPS reception monitor program according to the present embodiment uses the sky plot display unit 31 and the signal level display unit 32 to display information on GPS satellites used for positioning and information on GPS satellites not used for positioning. Are different.

  As a result, it is possible to easily grasp which signal is used for positioning. For example, when a displacement occurs in the positioning result, it is possible to appropriately grasp the cause of the displacement of the positioning.

  In addition, the GPS reception monitor program of the present embodiment displays a symbol 40 indicating the position of each GPS satellite in the sky plot display unit 31 and also displays a leader line from the symbol 40 to provide additional information regarding each GPS satellite. Is displayed.

  As a result, the reception status of signals from the respective GPS satellites can be grasped in more detail.

  Next, a modification of the above embodiment will be described. In the following description, components that are the same as or similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and description thereof is omitted.

  In the above embodiment, the reception status of one GPS receiver is displayed by one GPS reception monitoring device. However, there are cases where it is desired to evaluate a plurality of GPS receivers at the same time and compare the performance. Therefore, in this embodiment, as shown in FIG. 6, a plurality of GPS receivers 3 can be connected to one GPS reception monitor device 1. Although FIG. 6 shows a state in which two GPS receivers 3 are connected to the GPS reception monitor device 1, the number of GPS receivers 3 connected to the GPS reception monitor device 1 is not particularly limited.

  In this modified example, as shown in FIG. 7, the GPS reception monitor program displays the reception status display screens 30 for the reception statuses of the respective GPS receivers 3 side by side in one screen. However, the reception status display screens 30 may be arranged on the left and right, for example, or may be arranged in a grid pattern, for example. In short, it is only necessary that the reception status display screens 30 relating to different GPS receivers 3 are simultaneously displayed in one screen.

  In this way, by simultaneously displaying the reception statuses of the plurality of GPS receivers 3 in one screen, the performance can be evaluated while comparing the plurality of GPS receivers 3.

  Further, in this modification, the GPS reception monitor program changes the above-mentioned changes in all reception status display screens 30 when the user changes the screen display setting in any of the reception status display screens 30 arranged vertically. The specified settings are applied.

  For example, in the sky plot display unit 31, the user can set north up and heading up as described above. Here, for example, when the user sets the heading up by unchecking the north reference check box 43 on the upper reception status display screen 30, the heading up is automatically set on the lower reception status display screen 30. The Thus, by synchronizing the orientation of the sky plot on the plurality of reception status display screens 30, it is possible to easily visually recognize the traps of the GPS satellites where the plurality of GPS receivers 3 are receiving signals. Can do.

  Further, for example, in the positioning result display unit 33, the user can set the range of the two-dimensional plane displayed on the positioning history display unit 36 as described above. Here, for example, when the user inputs the display range of the positioning history display unit 36 in the display range input field 45 on the upper reception status display screen 30 and changes the display range, the lower reception status display screen 30 The display range of the positioning history display unit 36 is automatically changed to the same value as the changed display range (the display range of the upper positioning history display unit 36). As described above, by synchronizing the display range of the positioning history display unit 36 with the plurality of reception status display screens 30, it is possible to easily compare the positioning results of the plurality of GPS receivers 3.

  Further, in the positioning result display unit 33, as described above, automatic scaling can be designated. Here, for example, when the user activates the automatic scaling function by checking the automatic scaling check box 46 on the upper reception status display screen 30, the upper positioning result display unit 33 displays the positioning result history. The minimum display scale that fits all plot points is automatically set. In this case, the display scale of the positioning history display unit 36 on the lower reception status display screen 30 is automatically set to the same value as the automatically set display scale (the display scale of the upper positioning history display unit 36). Changed to As a result, the positioning history display unit 36 (in the above example, the upper positioning history display unit 36) of the GPS receiver 3 to be used as a reference can be used to the maximum extent possible, and a plurality of reception status display screens 30 can be used. Since the display scale of the positioning history display unit 36 can be synchronized, it is possible to more easily compare the positioning results of the plurality of GPS receivers 3.

  In addition, when automatic scaling is designated on any reception status display screen 30, the upper and lower reception status display screens 30 are matched to the display scale with the larger minimum display scale of the upper and lower reception status display screens 30. The display scale of the positioning history display unit 36 may be changed. That is, in this case, a minimum scale is set so that both all the plot points included in the upper positioning history display unit 36 and all the plot points included in the lower positioning history display unit 36 are accommodated. By doing in this way, especially when comparing the positioning position of a fixed point, the size of the positioning position can be easily visually confirmed.

  It should be noted that the synchronization of the display range (or display scale) of the positioning history display unit 36 between the plurality of reception status display screens 30 can be canceled. That is, a display range can be set individually for each positioning history display unit 36, or automatic scaling can be performed independently for each positioning history display unit 36.

  By the way, the GPS reception monitor apparatus 1 of this embodiment is a real-time monitor, and the data output from each GPS receiver 3 is not processed. Accordingly, in the signal level display unit 32, the display order of the bar graphs representing the signal levels remains in the format output from the GPS receiver 3. Similarly, in the correlation graph display unit 34, the display order of the correlation graph remains in the format output from the GPS receiver 3. Here, in what order the signal reception status data is output depends on the specifications of the GPS receiver 3. For example, some GPS receivers are configured to output data in the order of channels, while other GPS receivers are configured to output data in ascending order of satellite numbers. For this reason, even if it is the information regarding the same GPS satellite, the display positions of the bar graph and the correlation graph may be different on the upper and lower reception status display screens 30. Therefore, for example, even when trying to compare the signal level of a signal received from a specific GPS satellite with respect to a plurality of GPS receivers 3, the bar graph positions on the plurality of reception status display screens 30 are different. There is a problem that it is difficult to do.

  Therefore, in this modification, when the user selects information on a specific GPS satellite on any of the plurality of reception status display screens 30, the GPS reception monitor program selects the selected GPS on all reception status display screens 30. Information about satellites is highlighted. For example, when the user selects a bar graph related to the GPS satellite having the satellite number 24 on the upper reception status display screen 30, the selected bar graph is highlighted and the satellite is displayed on the lower reception status display screen 30. The bar graph for the number 24 GPS satellite is automatically highlighted. The same applies when a correlation graph is selected by the user. Thereby, even if it is a case where the reception condition of the GPS receiver 3 from which an output format differs is different, the information regarding the same GPS satellite can be compared easily.

  As described above, the GNSS reception monitor program of this modification can display the reception status display screens 30 for different GPS receivers 3 side by side on the display device 10.

  Thus, by displaying the reception statuses of the plurality of GPS receivers 3 side by side, the plurality of GPS receivers 3 can be easily compared.

  In addition, the GPS reception monitor program according to the present modification displays all the reception status displays when the settings related to the screen display are changed on any one of the reception status display screens 30 displayed side by side. The setting on the screen 30 is changed to the same setting as the setting after the change.

  Thus, since the display settings of the plurality of reception status display screens 30 can be synchronized, the information displayed on the plurality of reception status display screens 30 can be easily compared. That is, the reception status of each GPS receiver can be easily compared.

  Further, the GPS reception monitor program of the present modification is an operation for changing the setting of the orientation of the sky plot display unit 31 displayed on any one of the reception status display screens 30 displayed side by side. Is performed, the setting of the orientation of the sky plot display unit 31 displayed on all the reception status display screens 30 is changed to the same setting as the changed setting.

  Thereby, since the setting of the direction of the sky plot in each reception status display screen 30 can be synchronized, it is possible to easily visually recognize the trap of the GPS satellites received by each GPS receiver.

  In addition, the GPS reception monitor program of the present modified example sets the display scale or display range of the positioning result display unit 33 displayed on any one of the reception status display screens 30 displayed side by side. Is changed, the setting of the display scale or display range of the positioning result display unit 33 displayed on all the reception status display screens 30 is changed to the same setting as the setting after the change.

  Thereby, since the display scale or display range of the positioning result on each reception status display screen 30 can be synchronized, the positioning position by each GPS receiver can be easily compared.

  In addition, the GPS reception monitor program according to the present embodiment, when an operation for selecting a specific GPS satellite is performed on any one of the reception status display screens 30 displayed side by side, On the reception status display screen 30, information on the selected GNSS satellite is highlighted.

  Thereby, the information regarding the selected GPS satellite can be easily identified on each reception status display screen. Therefore, it is possible to easily compare signals from the selected GPS satellites among a plurality of reception status display screens.

  The preferred embodiments and modifications of the present invention have been described above, but the above configuration can be modified as follows, for example.

  GPS is used as the GNSS, but other GNSS may be used.

  In the above embodiment, the correlation graph is a three-dimensional graph, but is not limited thereto. For example, the correlation value may be drawn as a two-dimensional graph with the vertical axis representing the correlation value and the horizontal axis representing the frequency of the replica code. Further, for example, it may be drawn as a two-dimensional graph with the correlation value as the vertical axis and the code phase of the replica code as the horizontal axis. In short, it is only necessary to display a graph showing the relationship between the correlation value and the frequency or code phase of the replica code.

  The layout of the reception status display screen 30 shown in the drawing is an example, and is not limited to this. In short, sky plots, signal levels, positioning results, correlation graphs, and the like may be displayed on one screen.

  Although the GNSS reception monitoring apparatus has been described as being configured with software and hardware, a part or all of the functions of the GNSS reception monitoring apparatus may be configured with dedicated hardware.

  In the positioning result display unit 33, the accuracy of the positioning result can be determined as long as the positioning history display unit 36 is displayed. That is, the display of the positioning information display unit 35 and the display setting unit 38 may be omitted.

1 GPS reception monitoring device (GNSS reception monitoring device)
3 GPS receiver (GNSS receiver)
DESCRIPTION OF SYMBOLS 10 Display apparatus 30 Reception condition display screen 31 Sky plot display part 32 Reception level display part 33 Positioning result display part 34 Correlation graph display part

Claims (14)

A GNSS reception monitor program for displaying on a GNSS reception monitor device the reception status of signals received by a GNSS receiver from a plurality of GNSS satellites,
At least one of a sky plot display unit that displays the position of each GNSS satellite and a signal level display unit that displays the level of a signal received from each GNSS satellite;
A correlation graph display unit for displaying a correlation graph in which a correlation value between a signal received from at least one GNSS satellite and a replica code is plotted with respect to the frequency or code phase of the replica code;
A GNSS reception monitor program for displaying a reception status display screen for displaying a plurality of messages on a display device included in the GNSS reception monitor device. A GNSS reception monitor program according to claim 1,
A positioning result display unit that displays positioning results based on signals received from at least some of the GNSS satellites, at least one of the sky plot display unit and the signal level display unit, and a correlation graph display A GNSS reception monitor program for displaying on the display device together with a display unit. A GNSS reception monitor program according to claim 1 or 2,
When an operation for selecting a specific GNSS satellite is performed, information on the selected GNSS satellite is highlighted in at least one of the sky plot display unit and the signal level display unit and the correlation graph display unit. GNSS reception monitor program characterized by the above. A GNSS reception monitor program according to any one of claims 1 to 3,
When an operation for selecting a specific GNSS satellite is performed, the correlation graph display unit enlarges and displays the correlation graph related to the selected GNSS satellite. A GNSS reception monitor program according to any one of claims 1 to 4,
Reception mode information indicating whether a signal received from each GNSS satellite is being acquired or synchronized is displayed on at least one of the sky plot display unit and the signal level display unit. A GNSS reception monitoring program. A GNSS reception monitor program according to any one of claims 1 to 5,
In at least one of the sky plot display unit and the signal level display unit, the display method is different between information on a GNSS satellite used for positioning and information on a GNSS satellite not used for positioning, A GNSS reception monitoring program. A GNSS reception monitor program according to any one of claims 1 to 6,
A GNSS reception monitor program for displaying a symbol indicating the position of each GNSS satellite in the sky plot display unit and displaying a leader line from the symbol to display additional information regarding each GNSS satellite. A GNSS reception monitor program according to any one of claims 1 to 7,
A GNSS reception monitoring program, wherein the reception status display screens for different GNSS receivers can be displayed side by side on the display device. A GNSS reception monitor program according to claim 2,
In any one of the reception status display screens displayed side by side, when the settings related to the screen display are changed, the settings of all the reception status display screens are set to the same settings as the settings after the change. A GNSS reception monitor program characterized by changing. A GNSS reception monitor program according to claim 9,
When an operation for changing the setting of the orientation of the sky plot display section displayed on any one of the reception status display screens displayed side by side is performed, the setting is displayed on all reception status display screens. The GNSS reception monitor program, wherein the setting of the direction of the sky plot display unit is changed to the same setting as the changed setting. A GNSS reception monitor program according to claim 9 or 10,
When an operation for changing the setting of the display scale or display range of the positioning result display unit displayed on any one of the reception status display screens displayed side by side is performed, all reception status displays are displayed. A GNSS reception monitor program that changes the setting of the display scale or display range of the positioning result display unit displayed on the screen to the same setting as the changed setting. A GNSS reception monitor program according to any one of claims 8 to 11,
When an operation for selecting a specific GNSS satellite is performed on any one of the reception status display screens displayed side by side, information on the selected GNSS satellite is displayed on all reception status display screens. GNSS reception monitor program characterized by highlighting. A GNSS reception monitoring device that displays the reception status of signals received by a GNSS receiver from a plurality of GNSS satellites,
A display device,
At least one of a sky plot display section that displays the position of each GNSS satellite, or a signal level display section that displays the level of a signal received from each GNSS satellite;
A correlation graph display unit for displaying a correlation graph in which a correlation value between a signal received from at least one GNSS satellite and a replica code is plotted with respect to the frequency or code phase of the replica code;
A GNSS reception monitoring device, wherein a reception status display screen in which the messages are arranged is displayed on the display device. A GNSS reception monitoring apparatus according to claim 13,
A GNSS reception monitoring device, wherein the reception status display screens for different GNSS receivers can be displayed side by side on the display device.

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