JP2009260651A - Broadcast reception situation investigation support apparatus, and broadcast reception situation investigation support program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for saving power of reception situation investigation of terrestrial digital broadcasting. <P>SOLUTION: The broadcast reception situation investigation support device 1 is provided with: a measurement condition input means 11 for inputting a measurement object relay station for receiving terrestrial digital broadcasting and an examination point; a measuring instrument control means 12 for transmitting a measurement command to an ISDB-T (Integrated Services of Digital Broadcasting Terrestrial) signal analyzer 2 and receiving a measurement result; a storage means for storing a relay station position 24 of the terrestrial digital broadcasting and a delay adjustment amount 25; a distance calculating means 22 for calculating an inter-point distances between an SFN (Single Frequency Network) station and an examination point on the basis of a position of the SFN station comprising the SFN together with the measurement object relay station and an examination point position; a delay time calculating means 23 for calculating a delay time of the terrestrial digital broadcast wave at the SFN station on the basis of the inter-point distance and the delay adjustment amount; a report creating means 32 for creating a measurement result file writing the measurement condition and a measurement result to store it as a report; and a display means 40 for displaying the measurement result, the delay time, and the report. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a broadcast reception situation investigation support device and a broadcast reception situation investigation support program that support an investigator who conducts a reception situation investigation of terrestrial digital broadcasting.

  Conventionally, in domestic terrestrial digital broadcasting, an ISDB-T (Integrated Services of Digital Broadcasting Terrestrial) system based on a modulation system called an OFDM (Orthogonal Frequency Division Multiplexing) system has been adopted. In order to check whether a terrestrial digital broadcast signal (ISDB-T signal) can be received when a terrestrial digital broadcast receiving antenna is installed in a general home in a predetermined area, or to estimate the cause of reception failure, Digital broadcasting reception status survey is being conducted.

FIG. 16 is a diagram schematically showing a measurement method at the time of a conventional terrestrial digital broadcast reception situation investigation. An ISDB-T signal analyzer (measuring instrument) 902 that measures various radio wave characteristics of the ISDB-T signal is mounted on an electric vehicle 903 for moving to each investigation point as an investigation site. The electric vehicle 903 is provided with an antenna ANT having a length of several meters, and the radio wave characteristic of the ISDB-T signal received by the antenna ANT is measured by the ISDB-T signal analyzer 902. The ISDB-T signal analyzer 902 includes a dedicated measuring device for measuring numerical data such as terminal voltage, C / N (Carrier to Noise Ratio), bit error ratio (BER), and delay of OFDM signals. A delay profile measuring device (for example, see Patent Document 1) that measures a profile, an electric field strength calculation device (for example, see Patent Document 2) that calculates the field strength of an OFDM signal, and the like are known. Furthermore, general-purpose spectrum analyzers corresponding to various measurement items are also known.
JP 2006-93760 A Japanese Patent Laid-Open No. 2007-6112

  However, in the conventional reception status survey, the investigator has to operate the ISDB-T signal analyzer corresponding to various measurement items, and these operations are complicated. In addition, the investigator (measurer) spent a lot of time collecting the measurement results at each survey point in a report after completing the measurement work at a plurality of survey points.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technique that can save labor in the investigation of the reception status of digital terrestrial broadcasting.

  The present invention was devised in order to achieve the above-mentioned object. First, the broadcast reception status investigation support apparatus according to claim 1 is a delay of an ISDB-T signal for investigation of a digital terrestrial broadcast reception status. A broadcast reception status investigation support device that is communicably connected to an ISDB-T signal analyzer that measures radio wave characteristics including a profile and supports the reception status investigation, comprising: a measurement condition input means, a measuring instrument control means, and a storage Means, distance calculation means, delay time calculation means, report preparation means, and display means.

  According to such a configuration, the broadcast reception status investigation support device receives input of measurement conditions including the measurement target relay station that receives the terrestrial digital broadcast and the position of the investigation point, by the measurement condition input means. Here, the position of the survey point is, for example, information on the latitude and longitude of the survey point. Then, the broadcast reception status investigation support device receives the measurement result by transmitting the radio wave characteristic measurement command to the ISDB-T signal analyzer by the measuring instrument control means. Thereby, since the radio wave characteristic can be automatically measured by controlling the ISDB-T signal analyzer, the measurer can reduce time and effort for the ISDB-T signal analyzer.

  Further, according to such a configuration, the broadcast reception status investigation support device indicates that the storage means is a relay station that configures an SFN (Single Frequency Network) together with a position of the terrestrial digital broadcast relay station and a predetermined relay station. The position of the SFN station and the delay adjustment amount set in advance for each relay station are stored. Here, the position of the relay station is, for example, information on the latitude and longitude of the relay station. Then, the broadcast reception situation investigation support device uses the distance calculation means based on the position of each SFN station that constitutes the SFN together with the measurement target relay station and the received position of the investigation point, The distance between the two points with the survey point is calculated. Then, the broadcast reception status investigation support device calculates the delay time of the terrestrial digital broadcast wave in the SFN station based on the calculated distance between the two points and the delay adjustment amount by the delay time calculation means. Then, the broadcast reception status investigation support device creates a measurement result file in which the received measurement conditions and the received measurement results are described by a report creation means and stores the measurement result file as a report. As a result, it is possible to reduce the labor and time for preparing the report. Then, the broadcast reception status investigation support device displays the measurement result, the delay time, and the report on the display means. Therefore, the investigator can compare the display of the delay profile as the measurement result and the calculated delay time at the site of the reception point. Also, by making such a comparison, it is possible to examine or estimate the cause of reception failure on site.

  The broadcast reception status investigation support device according to claim 2 is the broadcast reception status investigation support device according to claim 1, wherein the storage means uses an antenna gain as a condition of equipment used for measuring the radio wave characteristics. , Further storing cable loss or booster gain, and the measuring instrument control means, as the measurement result of the radio wave characteristics, numerical data of terminal voltage, C / N and bit error rate, each of delay profile and signal constellation Each of the image data is received, and electric field strength measuring means is further provided.

  According to this configuration, the broadcast reception status investigation support device calculates the converted value of the electric field strength from the received terminal voltage based on the stored conditions of the used equipment by the electric field strength measuring means. Then, the broadcast reception status investigation support device writes the calculated electric field strength in the report in addition to the received measurement result by the report creation means. Therefore, the broadcast reception status investigation support device can determine the electric field strength corresponding to the antenna, cable, or booster used for measuring the radio wave characteristics. Therefore, the researcher can not only measure the electric field strength of the equipment actually used, but also can estimate the electric field strength when the equipment used is changed based on previously stored data.

  According to a third aspect of the present invention, the broadcast reception status investigation support device further includes a creation condition input means in the broadcast reception status investigation support according to the first or second aspect.

  According to such a configuration, the broadcast reception status investigation support device uses the creation condition input means to create a list output file indicating a list of survey results at the plurality of survey points as the report, and to output the list An instruction for a plurality of candidates for the survey point in the file is accepted as a condition for creating the report. Then, the broadcast reception status investigation support device further creates a report describing the measurement results obtained from the respective files stored for each of the survey points based on the accepted creation conditions by the report creation means. To do. Thereby, the effort and time which put together the measurement result in each investigation point in one report can be reduced.

  The broadcast reception status investigation support program according to claim 4 communicates with an ISDB-T signal analyzer that measures a radio wave characteristic including a delay profile of the ISDB-T signal in order to support a reception status investigation of digital terrestrial broadcasting. The position of the relay station of digital terrestrial broadcasting that is connected to the network, the position of the SFN station indicating that it is a relay station that constitutes the SFN together with a predetermined relay station, and a delay adjustment amount that is preset for each relay station. A computer having storage means for storing each of them is caused to function as measurement condition input means, measuring instrument control means, distance calculation means, delay time calculation means, report creation means, and display means.

  According to such a configuration, the broadcast reception status investigation support program accepts input of measurement conditions including the measurement target relay station that receives the terrestrial digital broadcast and the position of the investigation point by the measurement condition input means. Then, the broadcast reception status investigation support program receives the measurement result by transmitting the radio wave characteristic measurement command to the ISDB-T signal analyzer by the measuring instrument control means. Then, the broadcast reception situation investigation support program uses the distance calculation means based on the position of each SFN station that constitutes the SFN together with the measurement target relay station and the received position of the investigation point, The distance between the two points with the survey point is calculated. Then, the broadcast reception situation investigation support program calculates the delay time of the terrestrial digital broadcast wave in the SFN station based on the calculated distance between the two points and the delay adjustment amount by the delay time calculation means. Then, the broadcast reception status investigation support program creates a measurement result file in which the received measurement conditions and the received measurement results are described by a report creation means and stores it as a report. Then, the broadcast reception status investigation support program displays the measurement result, the delay time, and the report by display means.

  According to the invention described in claim 1 or claim 4, by controlling the ISDB-T signal analyzer, radio wave characteristics can be automatically measured and a report can be automatically created. For this reason, it is possible to save labor for the survey of the reception status of digital terrestrial broadcasting.

  According to the second aspect of the present invention, the electric field strength when the equipment used is changed can be estimated at the site of the survey point based on the data stored in advance according to the antenna, cable, or booster used for measuring the radio wave characteristics.

  According to the third aspect of the present invention, since a report describing the measurement results at each designated survey point can be created, it is possible to reduce labor and time for collecting the measurement results at each survey point into one report.

  The best mode (hereinafter referred to as “embodiment”) for carrying out a broadcast reception status investigation support device according to an embodiment of the present invention will be described below in detail with reference to the drawings.

(Broadcast reception status investigation support device)
FIG. 1 is a diagram schematically showing an electric vehicle equipped with a broadcast reception situation investigation support device according to the present invention, and FIG. 2 schematically shows a configuration of the broadcast reception situation investigation support device according to the present invention. It is a block diagram. The broadcast reception status investigation support device 1 supports the reception status survey of terrestrial digital broadcasting, and includes an arithmetic device such as a CPU, a storage device (storage means) such as a memory and a hard disk, and an external device such as a mouse and a keyboard. An input device that detects input of information, an interface device that transmits and receives various types of information via a communication line such as a LAN (Local Area Network), a computer that includes a display device such as an LCD (Liquid Crystal Display), and the like And programs installed on the computer. This broadcast reception status investigation support device 1 is communicably connected to an ISDB-T signal analyzer (measuring machine) 2 through a 10baseT cross cable LAN.

  The ISDB-T signal analyzer (measuring instrument) 2 is mounted on the electric vehicle (radio wave measuring vehicle) 3 together with the broadcast reception state investigation support device 1 and installed in the electric vehicle for investigation of the reception situation of digital terrestrial broadcasting. The radio wave characteristic of the ISDB-T signal received by the antenna ANT is measured. As shown in FIG. 2, the ISDB-T signal analyzer 2 roughly includes an operation display unit 4, a measurement unit 6, and a storage unit 8. The operation display unit 4 includes various buttons for operation by an operator, a display for displaying measurement results, and the like.

  Based on the command from the broadcast reception status investigation support device 1, the measurement unit 6 uses, for example, terminal voltage, C / N, bit error rate (BER), delay profile, signal constellation as the radio wave characteristics of the ISDB-T signal. For example, it is composed of a CPU, a memory, an electronic circuit for measurement, and the like.

  The storage unit 8 stores measurement screen image data such as a delay profile and a signal constellation, and includes, for example, a general hard disk. The ISDB-T signal analyzer 2 is commercially available, and for example, a product name “Digital TV Signal Analyzer R3466N” manufactured by Advantest Corporation can be used.

  The broadcast reception status investigation support device 1 is configured such that the hardware device and software cooperate with each other, and the hardware resources described above are controlled by a program, so that the measurement processing unit 10 illustrated in FIG. 20, the investigation result processing unit 30, and the display means 40 are realized.

  The measurement processing unit 10 performs processing (measurement processing) for controlling the ISDB-T signal analyzer 2 to measure the radio wave characteristics of the ISDB-T signal received by the antenna ANT. Machine control means 12 and electric field strength measurement means 13 are provided.

  The measurement condition input means 11 is an interface device that accepts input of measurement conditions from the outside. The measurement conditions include, for example, information on the measurement target relay station that receives the terrestrial digital broadcast and information on the position of the survey point. The measurement condition 14 input from the measurement condition input unit 11 is stored in a storage device such as a hard disk. In addition, the use equipment condition 15 is stored in a storage device such as a hard disk. The equipment used condition 15 indicates the conditions of the equipment used for the measurement of radio wave characteristics, and in this embodiment, the antenna equipment gain, cable loss, and booster gain are shown. FIG. 5 shows an example of an Excel file in which antenna gain, cable loss, and booster gain are input in advance as the equipment condition 15 to be used.

  The measuring instrument control means 12 shown in FIG. 2 transmits a measurement command for the radio wave characteristics of the ISDB-T signal to the ISDB-T signal analyzer 2 and receives the measurement result. The measurement command includes the measurement condition 14 received from the measurement condition input means 11. The measuring machine control means 12 stores the measurement result (numerical data) 51 received from the ISDB-T signal analyzer 2 and the image data 52 of the measurement result in a storage device such as a hard disk.

  The electric field strength measuring means 13 calculates a converted value of the electric field strength from the terminal voltage acquired as the measurement result 51 based on the use equipment condition 15 stored in a storage device such as a hard disk. The calculated electric field strength is output to the report creation means 32 and the display means 40. As a calculation example, when the terminal voltage is 64 [dBμV] and 17 [dBμV / m] needs to be added according to the use equipment condition 15, the electric field strength is 81 [dBμV / m]. At this time, if it is necessary to add 18 [dBμV / m] according to the use equipment condition 15, the electric field strength is 82 [dBμV / m].

  The situation investigation processing unit 20 executes a process (situation investigation process) for calculating a delay time of the terrestrial digital broadcast wave in the SFN station constituting the SFN together with the measurement target relay station of the terrestrial digital broadcast. Means 21, distance calculation means 22, and delay time calculation means 23 are provided. This situation investigation process makes it possible to compare the delay time with the delay profile measured from the ISDB-T signal.

  Further, in order to execute the situation investigation process, the relay station position 24 and the delay adjustment amount 25 are stored in a storage device such as a hard disk of the broadcast reception situation investigation support apparatus 1, respectively. The relay station position 24 indicates the position of the relay station for digital terrestrial broadcasting, and the position of the SFN station indicating that it is a relay station that forms an SFN together with a predetermined relay station. The position of the relay station is represented by the latitude and longitude of the relay station, for example. The delay adjustment amount 25 indicates a delay adjustment amount set in advance for each relay station. This delay adjustment amount indicates the time for adjusting the timing of transmitting a radio wave set in each relay station so that the delay time of the delayed wave is within the guard interval. Note that the relay station position 24 and the delay adjustment amount 25 are input in advance as an Excel file, for example, and may be input in the same Excel file or may be input in separate Excel files. Also, the relay station position 24, delay adjustment amount 25, measurement condition 14, equipment condition 15 used, measurement result 51, and image data 52 shown in FIG. 2 may be stored in the same storage means, or other The storage means may be distributed and stored.

  The relay station condition input means 21 receives a channel condition for displaying the delay time as a relay station condition. The accepted relay station condition is output to the distance calculation means. In the present embodiment, any one selected from DG, DE, and DP is accepted as a channel condition (channel type) for displaying the delay time. Here, DG indicates general TV, DE indicates educational TV, and DP indicates commercial broadcasting.

  The distance calculation unit 22 calculates the distance between the SFN station and the survey point based on the position of the SFN station that constitutes the SFN together with the measurement target relay station and the position of the survey point received by the measurement condition input unit 11. Each is calculated. The calculated distance is output to the delay time calculation means 23.

  The delay time calculating means 23 calculates the delay time of the digital terrestrial broadcast wave in the SFN station based on the distance between the two points calculated by the distance calculating means 22 and the delay adjustment amount 25 stored in a storage device such as a hard disk. Is to be calculated. For example, of two relay stations, the difference ΔL between the distance between two points with one relay station and the distance between two points with the other relay station is expressed as a radio wave propagation speed (0.3 [km / μsec]. ) Is calculated as a relative delay time difference ΔT between the two relay stations (for example, 10 [μsec]). For example, when the delay adjustment amount of “+30 [μsec]” is set in one relay station, the delay time of the radio wave transmitted from this relay station is 40 [μsec] (= 10 [μsec]. ] +30 [μsec]). The distance between the two points calculated by the distance calculating unit 22 and the delay time calculated by the delay time calculating unit 23 are stored as the calculation result 26 in the same or different storage devices such as hard disks.

  The survey result processing unit 30 creates a report including the measurement results (numerical data, measurement screen image data) by the ISDB-T signal analyzer 2, the calculated electric field strength, and the measurement conditions as a result of the reception status survey. The process (investigation result process) is executed, and includes a creation condition input unit 31 and a report creation unit 32.

  The creation condition input means 31 creates a report including a creation instruction of a list output file showing a list of survey results at a plurality of survey points as a report and a plurality of candidate survey points in the list output file It is accepted as a condition. In the present embodiment, the creation condition input means 31 is a creation instruction for a single sheet output file indicating a survey result at one survey point as a report or a creation instruction for a list output file. And the determination result is output to the report creation means 32.

  The report creation means 32 is a measurement result describing the measurement condition 14 received by the measurement condition input means 11, the calculated electric field strength, the measurement result 51 received from the ISDB-T signal analyzer 2, and the image data 52 of the measurement result. A file is created and saved as a report. The measurement result file (report) is composed of, for example, an Excel file. The created reports 33 are stored in the same or different storage devices such as hard disks. At the time of saving, csv (Comma Separated Values) files are simultaneously saved in the same or different storage devices such as hard disks.

  In the present embodiment, the report creation means 32 creates a cut sheet output file (report) when receiving a creation instruction for a cut sheet output file as a measurement result file from the creation condition input means 31. In addition, when the report creation means 32 receives an instruction to create a list output file as a measurement result file, the report creation means 32 acquires the measurement result from the csv file saved together with the cut sheet output file for each survey point. Create a list output file (report) describing the measurement results.

  The display means 40 displays the measurement result 51 by the ISDB-T signal analyzer 2, the image data 52 of the measurement result, the delay time of the calculation result 26 and the report 33, for example, a hardware such as a liquid crystal display (LCD). And display control means as software for displaying image data and the like so as to be displayed on the display.

  The broadcast reception status investigation support device 1 can be realized by operating a general computer by a program that functions as each of the above-described means. This program (broadcast reception status investigation support program) can be provided via a communication line, or can be written and distributed on a recording medium such as a CD-ROM.

(Example of start screen display of the broadcast reception status investigation support device)
FIG. 3 is a diagram showing a start screen display example of the broadcast reception status investigation support device according to the present invention. On the startup screen, a measurement condition input area 101 and a measurement result display area 102 are provided above and below. Next to the measurement result display area 102, various event buttons are displayed that allow the measurer to perform processing such as measurement, report creation, and report saving by clicking the display button.

  In the measurement condition input area 101, as basic information, information such as the measurement date and time, the measurer (investigator), and the measurement location (address of the survey point, latitude and longitude) are entered into each text box (input field) from a mouse or keyboard. It is displayed for input.

  In the measurement condition input area 101, information on the antenna used, the cable used, the booster used, and the like can be input as a measurement equipment condition (measurement equipment condition) by pull-down or the like.

  Further, in the measurement condition input area 101, as the conditions (measuring machine conditions) of the ISDB-T signal analyzer (measuring machine) 2, measuring machine IP address, preamp (preamplifier) on / off, ATT (attenuator) decibel value, etc. This information is displayed so that it can be input by mouse or pull-down. Note that the measurement conditions input to the measurement condition input area 101 are configured to be stored / read.

  In the measurement result display area 102, for each channel type, as basic measurement items, terminal voltage (measurement result of ISDB-T signal analyzer 2) and electric field strength (calculation result of broadcast reception status investigation support device 1) are recorded. A text box (numerical data display field) is displayed.

  In the measurement result display area 102, CNR (C / N), BER (bit error rate), and optional measurement items that can be selected by the measurer for each channel type (for each DG, DE, and DP). , Multipath (delay profile) and MER (Modulation Error Ratio) check boxes (measurement item selection fields) are displayed respectively.

  Here, for CNR and BER, text boxes for displaying numerical data as measurement results are provided. For Multipath and MER, measurement screen image data as a measurement result is displayed on a window screen different from the startup screen (both screens can be displayed simultaneously). Although not shown on the other window screen, the channel selection field by the measurer, the display command button for displaying the multipath or MER of the selected channel, and the displayed measurement result (measurement screen image) are remeasured. And a re-measurement button. The measurement result of MER is visually displayed by the corresponding signal constellation.

  In addition, in the measurement result display area 102 of the startup screen, reception availability and the receiver BER are displayed as measurement result items that can be input by the measurer for each channel type. When the receiver BER is “0”, “0” is automatically input in the receiver BER column, and “◯ (good reception)” is automatically input in the reception availability column.

  As various event buttons on the startup screen, for example, a measurement button 103, an SFN station display button 104, a cut sheet output button 105, and a list output button 106 are provided. The measurement button 103 instructs the measurement processing unit 10 (see FIG. 2) to operate. That is, when the measurer clicks the measurement button 103, the broadcast reception situation investigation support device 1 transmits a measurement command for the measurement item selected on the startup screen to the ISDB-T signal analyzer 2. A process for receiving the measurement result (measurement process) is executed.

  The SFN station display button 104 instructs the situation investigation processing unit 20 (see FIG. 2) to operate. That is, when the measurer clicks the SFN station display button 104, the broadcast reception status investigation support device 1 calculates the delay time of the terrestrial digital broadcast wave in the SFN station that constitutes the SFN together with the measurement target relay station (situation) (Investigation process) is executed.

  The cut sheet output button 105 and the list output button 106 are for instructing the operation to the investigation result processing unit 30 (see FIG. 2). That is, when the measurer clicks the cut sheet output button 105, the broadcast reception situation investigation support device 1 creates a cut sheet output file (report) at the investigation point. In addition, when the measurer clicks the list output button 106 and selects a plurality of survey points on a window screen (see FIG. 14) different from the start screen, the broadcast reception status survey support apparatus 1 Create an output file (report). In addition, when not distinguishing both, it only describes with an output button.

[Broadcast reception status investigation support device operation]
Next, referring to FIG. 4 (refer to FIGS. 2 and 3 as appropriate), the operation of the broadcast reception status investigation support device 1 will be described. FIG. 4 is a flowchart showing the flow of the terrestrial digital broadcast reception status survey using the broadcast reception status survey support device according to the present invention.

  First, the measurer inputs in advance the measurement conditions (measurement date and time, measurement location information, measurer, measuring instrument conditions, etc.) shown in the measurement condition input area 101 of FIG. 3 on the startup screen (step S1). Further, the measurer inputs (selects) the measurement items (C / N / BER / delay profile / MER) and the measurement channel shown in the measurement result display area 102 in FIG. 3 in advance (step S2). . Thereby, the broadcast reception status investigation support device 1 accepts input of measurement conditions and the like from the outside by the measurement condition input means 11. Note that the order of step S1 and step S2 is arbitrary.

  Subsequently, when the measurer clicks the measurement button 103 shown in FIG. 3 on the startup screen (step S3), the broadcast reception situation investigation support device 1 executes a measurement process (step S4). Thereby, the measurer can check the measurement results (numerical data, measurement screen image data). If the measurer determines that the measurement result does not match the expectation, the measurer clicks the SFN station display button 104 shown in FIG. 3 (step S5). Then, the broadcast reception situation investigation support device 1 executes situation investigation processing (step S6), and displays the delay time of the broadcast wave of the SFN station on the screen. Thereby, the measurer can compare and examine the delay profile and the displayed delay time. It is also possible to remeasure as described above.

  On the other hand, the measurer confirms the measurement result in step S4, and skips step S5 and step S6 when the measurement result matches the expected value. Subsequently, when the measurer clicks the output button (the cut sheet output button 105 or the list output button 106 shown in FIG. 3) (step S7), the broadcast reception state investigation support device 1 executes the investigation result process. (Step S8). Thus, an Excel report corresponding to the clicked output button is displayed (output).

<Measurement process>
FIG. 6 is a flowchart showing details of the measurement process shown in FIG. First, the measuring device control means 12 of the broadcast reception status investigation support device 1 designates the measuring device IP address and port number and executes connection with the ISDB-T signal analyzer 2 (step S11). Then, the measuring instrument control means 12 transmits a measuring instrument initialization command to the ISDB-T signal analyzer 2 (step S12). The measuring instrument initialization command is for initializing the ISDB-T signal analyzer 2 before performing a new investigation (measurement).

  Then, the measuring instrument control means 12 transmits a measuring instrument condition designation command to the ISDB-T signal analyzer 2 (step S13). The measuring instrument condition designation command is for designating measuring instrument conditions such as preamp on / off and ATT (attenuator) decibel values.

  Then, the measuring instrument control means 12 counts the number of selected “channels” (number of measurement channels) in the measurement result display area 102 of the startup screen shown in FIG. 3 (step S14). Then, the measuring instrument control means 12 transmits a channel designation command for designating one of the selected channels to the ISDB-T signal analyzer 2 (step S15). Similarly, the measuring instrument control means 12 transmits a terminal voltage measurement execution command and a result request command (step S16). Then, the measuring instrument control means 12 receives the terminal voltage of the designated channel from the ISDB-T signal analyzer 2, and displays the received measurement result in the text box of the “terminal voltage” item on the startup screen (step S17).

  Then, if the terminal voltage measurement count has not reached the number of measurement channels counted in step S14, that is, if there is an unmeasured channel (step S18: Yes), the measuring instrument control means 12 returns to step S15, and next Send a command to specify the channel.

  On the other hand, when the terminal voltage measurement count reaches the number of measurement channels, that is, when there is no unmeasured channel (step S18: No), the electric field strength measurement means 13 uses the startup screen equipment (used antenna, used cable, If “use booster” is selected from the pull-down (step S19: Yes), an Excel file in which the selected equipment conditions (antenna gain, cable loss, booster gain) are input is read (step S20). Then, the electric field strength measuring means 13 converts the electric field strength according to the terminal voltage and the equipment conditions (Excel file value) (step S21), and the electric field strength (converted value) is converted into the text of the “electric field strength” item on the startup screen. It is displayed in a box (step S22). If the equipment used (the antenna used, the cable used, and the booster used) is not selected on the startup screen (step S19: No), the processing of step S20 to step S22 is skipped.

  Subsequently, the broadcast reception status investigation support device 1 performs C / N measurement processing (step S30), bit error rate measurement as processing for each measurement item selected in the measurement result display area 102 of the startup screen shown in FIG. Processing (step S40), delay profile measurement processing (step S50), and signal constellation measurement processing (step S60) are sequentially executed. Note that the execution order of processing for each measurement item is arbitrary.

≪C / N measurement process≫
FIG. 7A is a flowchart showing details of the C / N measurement process shown in FIG. When the item “CNR” is checked in the channel selected in the measurement result display area 102 of the startup screen shown in FIG. 3 (step S31: Yes), the measuring instrument control means 12 sends the channel designation command to the ISDB. -Transmit to T signal analyzer 2 (step S32). Similarly, the measuring instrument control means 12 transmits a C / N measurement execution command and a result request command (step S33). Then, the measuring instrument control means 12 receives the C / N of the designated channel from the ISDB-T signal analyzer 2, and displays the received measurement result in the text box of the “C / N” item on the startup screen (step S34). ).

  When the number of C / N measurements has not reached the number of measurement channels counted in step S14, that is, when there is an unmeasured channel (step S35: Yes), the measuring instrument control unit 12 returns to step S32. Send a command to specify the next channel. If there is no unmeasured channel (step S35: No), or if the item “CNR” on the startup screen is not checked (step S31: No), the C / N measurement process is terminated.

≪Bit error rate measurement process≫
FIG. 7B is a flowchart showing details of the bit error rate measurement process shown in FIG. The processing from step S41 to step S45 shown in FIG. 7B is the same as the processing from step S31 to step S35 shown in FIG. 7A in which “CNR or C / N” is replaced with “BER”. The description is omitted.

≪Delay profile measurement process≫
FIG. 8A is a flowchart showing details of the delay profile measurement process shown in FIG. When the item “Multipath” is checked in the channel selected in the measurement result display area 102 of the startup screen shown in FIG. 3 (step S51: Yes), the measuring instrument control means 12 sends a channel designation command to the ISDB. -Transmit to T signal analyzer 2 (step S52). Similarly, the measuring instrument control means 12 transmits a Multipath measurement execution command (step S53), and transmits a measurement result screen storage execution command (step S54). Thereby, the ISDB-T signal analyzer 2 stores the measurement result screen displayed on the operation display unit 4 in the storage unit 8.

  And the measuring machine control means 12 copies the measurement result screen (measurement result image data) preserve | saved at the memory | storage part 8 of ISDB-T signal analyzer 2 (step S55). As a result, the broadcast reception status investigation support device 1 stores the copied measurement result screen on the hard disk. The measuring instrument control means 12 reads the measurement result screen (delay profile measurement result image data) saved for the designated channel and displays it on a window screen different from the startup screen (step S56).

  Then, when the number of measurement of the delay profile has not reached the number of measurement channels counted in step S14, that is, when there is an unmeasured channel (step S57: Yes), the measuring instrument control unit 12 returns to step S52, Send a command to specify the next channel. If there is no unmeasured channel (step S57: No), or if the item “Multipath” on the startup screen is not checked (step S51: No), the delay profile measurement process is terminated.

≪Signal constellation measurement process≫
FIG. 8B is a flowchart showing details of the signal constellation measurement process shown in FIG. The processing from step S61 to step S67 shown in FIG. 8B is the same as the processing from step S51 to step S57 shown in FIG. 8A in which “Multipath” is replaced with “MER”, and thus the description thereof is omitted. To do.

<Situation investigation processing>
FIG. 9 is a flowchart showing details of the situation investigation process shown in FIG. When the SFN station display button 104 shown in FIG. 3 is clicked, the broadcast reception status investigation support device 1 displays a channel selection screen for displaying the delay time on a window screen different from the startup screen (step S1). S71). An example of the channel selection screen is shown in FIG.

  In the screen example shown in FIG. 10, a DG display button 201, a DE display button 202, and a DP display button 203 are provided as buttons for selecting a channel. The DG display button 201 is a button for selecting a measurement target relay station that broadcasts the general television and its SFN station. The DE display button 202 is a button for selecting a measurement target relay station that broadcasts educational television and its SFN station. Similarly, the DP display button 203 is a button for selecting a measurement target relay station that broadcasts a commercial broadcast and its SFN station.

  In step S71, with the window screen as shown in FIG. 10 displayed, the operator selects a channel. The screen example shown in FIG. 10 indicates that the DG display button 201 has been selected so that “DG” is displayed in the channel type display area 204. The broadcast reception situation investigation support device 1 reads the Excel file of the relay station for the selected channel by the distance calculation unit 22, acquires the relay station position of each relay station having an SFN relationship, and the delay time calculation unit 23 Then, the delay adjustment amount 25 is acquired (step S72). Then, the distance calculation means 22 calculates the distance between the two points between the survey point and each relay station from the position (latitude / longitude) of the survey point and the position (latitude / longitude) of each relay station (step S73). . Then, the delay time calculating means 23 calculates the delay time of the broadcast wave of each relay station from the calculated distance between the two points and the delay adjustment amount of each relay station (step S74).

  Then, the broadcast reception situation investigation support device 1 displays the calculation result (distance from the examination point, delay time) together with the relay station name (step S75). For example, the window screen shown in FIG. 10 includes a relay station 205, a distance 206 from the investigation point, and a delay time 207 as display items. Here, the distance 206 from the survey point and the delay time 207 indicate calculation results by the broadcast reception status survey support device 1. Accordingly, the measurer can compare and examine the delay amount obtained from the image of the multipath (delay profile) and the calculated delay time.

<Survey result processing (single form)>
FIG. 11 is a flowchart showing details of the investigation result process (single form) shown in FIG. When the cut sheet output button 105 shown in FIG. 3 is clicked, the broadcast reception status investigation support device 1 opens the cut sheet output file by the report creation means 32 (step S81). Then, the report creation means 32 outputs the value of the “measurement condition” text box in the measurement condition input area 101 of the startup screen shown in FIG. 3 to the designated cell of the single sheet output file (step S82). Similarly, the report creation means 32 outputs the measurement result values (terminal voltage, electric field strength, C / N, BER) in the measurement result display area 102 of the startup screen shown in FIG. Step S83).

  If the number of output of numerical data has not reached the number of measurement channels (number of output channels <measurement channel) (step 84: No), the report creation means 32 returns to step S83. On the other hand, when the number of output of numerical data has reached the number of measurement channels (number of output channels ≧ measurement channel) (step 84: Yes), the report creation means 32 displays the measurement result screen (measurement) of “Multipath” and “MER”. The corresponding image file is read for each channel from the folder storing the result image data (step 85).

  Then, the report creation means 32 adjusts the size of the read image and outputs it to the designated cell (step S86). If the number of output times of image data has not reached the number of measurement channels (number of output channels <measurement channel) (step 87: No), the process returns to step S85. On the other hand, if the number of output times of image data has reached the number of measurement channels (number of output channels ≧ measurement channel) (step 87: Yes), the file name is automatically assigned to the open single sheet output file, and the csv file is While saving, a report (measurement result file) as illustrated in FIG. 12 is displayed on the screen.

<Survey result processing (list)>
FIG. 13 is a flowchart showing details of the investigation result process (list) shown in FIG.
When the list output button 106 shown in FIG. 3 is clicked, the broadcast reception situation investigation support device 1 opens each csv file in which the measurement result (survey result) for each investigation point is input by the report creation means 32. (Step S91). Then, the report creating means 32 reads each csv file and displays a window screen of a list of survey spot names as exemplified in FIG. 14 (step S92). In this window screen, when the measurer (operator) selects a plurality of survey spot names to be output as a list as shown by the selection area 301 in FIG. 14 and clicks the output button 302, the broadcast reception status survey support apparatus 1 Then, the list creation file is opened by the report creating means 32 (step S93). Then, the report creation means 32 outputs the “channel”, “terminal voltage”, “field strength”, “C / N”, and “BER” values of the csv file to the designated cell of the list output file. (Step S94).

  And the report preparation means 32 returns to step S94, when the number of output points of numerical data has not reached the number of selections of investigation points (number of output points <number of investigation points selection) (step 95: No). On the other hand, when the number of output points of the numerical data has reached the number of selected survey points (the number of output points ≧ the number of selected survey points) (step 95: Yes), the report creating means 32 displays the opened list output file. A file name is automatically assigned and saved, and a report (measurement result file) as shown in FIG. 15 is displayed on the screen (step 96).

  According to the broadcast reception status investigation support device 1 of the present embodiment, the radio wave characteristics of the ISDB-T signal can be automatically measured by controlling the ISDB-T signal analyzer 2 at the site of the investigation point, and the measurement result file (report) ) Can be created automatically. For this reason, it is possible to save labor for the survey of the reception status of digital terrestrial broadcasting. Also, according to the broadcast reception status investigation support device 1, the delay profile as the measurement result and the calculated delay time can be displayed, so that the measurer can compare and estimate the cause of the reception failure on the spot. You can do it. Furthermore, according to the broadcast reception status investigation support device 1, since the measurement result file (report) can be created as a list output file, it is possible to reduce the time and effort of collecting the measurement results at each investigation point into one report. .

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment. For example, in the broadcast reception status survey, the terminal voltage, C / N, bit error rate (BER), delay profile, and signal constellation are described as being measured, but the measurement items are not limited to these.

  Further, the measurement result file (report) is not limited to those illustrated in FIG. 12 and FIG. 15, and for example, the survey point and the position of the relay station can be mapped to map data and displayed.

  Further, if the broadcast reception status investigation support device 1 includes a GPS receiver and the position information acquired from the GPS receiver is automatically input as the investigation point position of the measurement condition, further labor saving can be achieved.

It is a figure which shows typically the electric survey vehicle provided with the broadcast reception condition investigation assistance apparatus which concerns on this invention. It is a block diagram which shows typically the structure of the broadcast reception condition investigation assistance apparatus which concerns on this invention. It is a figure which shows the example of a starting screen display of the broadcast reception condition investigation assistance apparatus which concerns on this invention. It is a flowchart which shows the flow of the terrestrial digital broadcast reception condition investigation using the broadcast reception condition investigation assistance apparatus which concerns on this invention. It is a figure which shows the example of a screen display of the file by which the equipment condition was input beforehand. 6 is a flowchart showing details of the measurement process shown in FIG. 4. 7 is a flowchart showing details of C / N measurement processing and bit error rate measurement processing shown in FIG. 6. 7 is a flowchart showing details of a delay profile measurement process and a signal constellation measurement process shown in FIG. 6. It is a flowchart which shows the detail of the situation investigation process shown in FIG. It is a figure which shows the example of a screen display of relay station distance and delay time. It is a flowchart which shows the detail of the investigation result process (single form) shown in FIG. It is a figure which shows the example of a screen display of the file for single sheet | seat output in which the investigation result was input. It is a flowchart which shows the detail of the investigation result process (list) shown in FIG. It is a figure which shows the example of a screen display of the list of investigation point names. It is a figure which shows the example of a screen display of the list output file into which the investigation result was input. It is a figure which shows typically the measuring method at the time of the conventional terrestrial digital broadcast reception condition investigation.

Explanation of symbols

1 Broadcast reception status investigation support device 2 ISDB-T signal analyzer (measuring machine)
DESCRIPTION OF SYMBOLS 3 Electric vehicle 10 Measurement processing part 11 Measurement condition input means 12 Measuring machine control means 13 Electric field strength measurement means 14 Measurement conditions 15 Equipment conditions 20 Condition investigation processing part 21 Relay station condition input means 22 Distance calculation means 23 Delay time calculation means 24 relay station position 25 delay adjustment amount 30 survey result processing unit 31 creation condition input means 32 report creation means 33 report 40 display means 51 measurement result 52 image data ANT antenna

Claims (4)

A broadcast reception status investigation support device that is communicably connected to an ISDB-T signal analyzer that measures a radio wave characteristic including a delay profile of an ISDB-T signal to investigate the reception status of a terrestrial digital broadcast and supports the reception status survey. There,
A measurement condition input means for receiving input of measurement conditions including a measurement target relay station that receives digital terrestrial broadcasting and a position of a survey point;
Measuring instrument control means for transmitting a measurement command of the radio wave characteristic to the ISDB-T signal analyzer and receiving a measurement result;
The position of the relay station for digital terrestrial broadcasting, the position of the SFN station indicating that it is a relay station that constitutes an SFN (Single Frequency Network) together with a predetermined relay station, and a delay adjustment amount set in advance for each relay station. Storage means for storing each;
Distance calculation means for calculating the distance between each SFN station and the survey point based on the position of each SFN station that constitutes the SFN together with the measurement target relay station and the received position of the survey point When,
A delay time calculating means for calculating a delay time of the terrestrial digital broadcast wave in the SFN station based on the calculated distance between the two points and the delay adjustment amount;
A report creation means for creating a measurement result file describing the received measurement conditions and the received measurement results and storing the file as a report;
A broadcast reception status investigation support device, comprising: display means for displaying the measurement result, the delay time, and the report. The storage means further stores antenna gain, cable loss or booster gain as conditions of equipment used for measuring the radio wave characteristics,
The measuring instrument control means receives the terminal voltage, C / N and bit error rate numerical data, and the delay profile and signal constellation image data as the measurement results of the radio wave characteristics,
Further comprising electric field strength measuring means for calculating a converted value of electric field strength from the received terminal voltage based on the stored conditions of the used equipment;
2. The broadcast reception status investigation support device according to claim 1, wherein the report creation means describes the calculated electric field strength in the report in addition to the received measurement result. An instruction to create a list output file indicating a list of survey results at a plurality of survey points as the report, and an instruction of a plurality of candidates for the survey points in the list output file are used as the report creation conditions. It further comprises a creation condition input means for accepting,
The report creating means further creates a report describing measurement results obtained from the respective files stored for each of the survey points based on the accepted creation conditions. The broadcast reception status investigation support device according to claim 2. In order to support the investigation of the reception status of terrestrial digital broadcasting, the position of a relay station for terrestrial digital broadcasting is connected to an ISDB-T signal analyzer that measures radio wave characteristics including a delay profile of the ISDB-T signal. A computer having storage means for storing the position of the SFN station indicating that it is a relay station that constitutes an SFN together with the relay station, and a delay adjustment amount set in advance for each relay station;
Measurement condition input means for receiving input of measurement conditions including a relay station to be measured for receiving digital terrestrial broadcasting and the position of the survey point;
Measuring instrument control means for transmitting a measurement command of the radio wave characteristic to the ISDB-T signal analyzer and receiving a measurement result,
Distance calculation means for calculating the distance between each SFN station and the survey point based on the position of each SFN station that constitutes the SFN together with the measurement target relay station and the received position of the survey point ,
A delay time calculating means for calculating a delay time of the terrestrial digital broadcast wave in the SFN station based on the calculated distance between the two points and the delay adjustment amount;
A report creation means for creating a measurement result file describing the received measurement conditions and the received measurement results and storing the file as a report;
Display means for displaying the measurement result, the delay time and the report;
Broadcast reception status investigation support program characterized by functioning as

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