JP2006020361A - Communication state analyzing apparatus, communication state analyzing method, and communication state analyzing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately discover at a low cost and in a short period of time a position where a communication state is bad in an area of a mobile telephone system. <P>SOLUTION: A CPU 71 specifies the position of the communication state whose characteristic value meets a prescribed condition according to a program 81 on the basis of each place position information in the area of the mobile telephone system and the prescribed characteristic value showing a radio wave state at communicating a communication circuit of a mobile telephone set among base stations by an imitated circuit at the position. A display 62 displays the position specified by a position specifying means on a map and displays a receiving state of a signal from a GPS satellite at measuring the characteristic value on the map. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication state analysis device, a communication state analysis method, and a communication state analysis program for specifying and displaying a position of a predetermined communication state based on a measured value of a radio wave state at various places in an area of a mobile telephone system It is about.

  When providing a mobile telephone service, it is required that a good communication state can be obtained throughout the communicable area. However, depending on the setting of the antenna direction of the base station, radio wave output, etc., a place with a poor communication state may occur even within the area due to fading, multipath, interference waves, and the like.

  Conventionally, in order to find a position where such a communication state is bad, a lot of workers are sent to various places in the area of the mobile telephone system to measure the radio wave state. Whenever a location with a poor communication status is found, the settings of the antenna direction of the base station, radio wave output, etc. are adjusted to eliminate the location with such a poor communication status, and good communication is possible throughout the area. The state is obtained.

  However, a method of measuring a radio wave state at each place in the area by a large number of workers and finding a position having a poor communication state requires a lot of labor costs. In addition, if it is attempted to perform measurement with a small number of people in order to reduce labor costs, it takes a long time to measure the radio wave condition in the entire area.

  The present invention has been made to solve the above-described problems, and can accurately find a position with a poor communication state in an area of a mobile telephone system at a low cost and in a short time. An object of the present invention is to obtain a communication state analysis device, a communication state analysis method, and a communication state analysis program capable of easily recognizing the positioning accuracy of each point such as a communication failure point.

  In order to solve the above problems, the present invention is configured as follows.

  The communication state analysis device of the present invention is the position information of each place in the area of the mobile telephone system, and when communicating with the base station by the circuit simulating the communication circuit of the mobile telephone at that position Based on a predetermined characteristic value indicating the radio wave state, the position specifying means for specifying the position of the communication state in which the characteristic value satisfies the predetermined condition, the position specified by the position specifying means are displayed on the map, and the characteristic Position display means for displaying on a map the reception state of signals from GPS satellites when measuring values.

  Using this communication status analysis device, even if there are multiple locations in the area with poor communication status, you can easily see them, and you can identify locations with poor communication status in the mobile phone system area at low cost and in a short time. Can be found. Furthermore, the positioning accuracy of each point such as a communication failure point in the area can be easily visually confirmed.

  Further, in the communication state analysis apparatus of the present invention, in addition to the communication state analysis apparatus of the present invention, the position display means displays the reception state of the correction information for DGPS on the map when the characteristic value is measured.

  By using this communication state analyzer, the positioning accuracy of each point such as a communication failure point in the area can be easily visually confirmed.

  Furthermore, the communication state analysis apparatus of the present invention is a communication state analysis apparatus of the present invention, in which the position display means is provided for the size, color, and figure of the image indicating the position according to the reception state of the signal from the GPS satellite. At least one of them is changed.

  The communication state analysis method of the present invention is based on the location information of each place in the area of the mobile phone system and the communication with the base station by the circuit simulating the communication circuit of the mobile phone at that location. Based on a predetermined characteristic value indicating a radio wave state, a step of specifying a communication state position where the characteristic value satisfies a predetermined condition, a step of displaying the specified position on a map, and a GPS at the time of measuring the characteristic value Displaying a signal reception state from a satellite on a map.

  Using this communication status analysis method, even if there are multiple locations in the area with poor communication status, you can easily see them, and you can identify locations with poor communication status in the mobile phone system area at low cost and in a short time. Can be found. Furthermore, the positioning accuracy of each point such as a communication failure point in the area can be easily visually confirmed.

  The communication state analysis program according to the present invention is the location information of each place in the area of the mobile telephone system, and when communicating with the base station by a circuit simulating the communication circuit of the mobile telephone at that position. Based on a predetermined characteristic value indicating the radio wave state, the position specifying means for specifying the position of the communication state whose characteristic value satisfies the predetermined condition, and the position specified by the position specifying means are displayed on the map, This is for causing the computer to function as a position display control means for displaying on the map the reception state of the signal from the GPS satellite when the characteristic value is measured.

  By using this communication status analysis program, even if there are multiple locations in the area with poor communication status, you can easily see them, and you can identify locations with poor communication status in the mobile phone system area at low cost and in a short time. Can be found. Furthermore, the positioning accuracy of each point such as a communication failure point in the area can be easily visually confirmed.

  According to the present invention, it is possible to accurately find a position where the communication state in the area of the mobile telephone system is bad at a low cost and in a short time, and further, the positioning accuracy of each point such as a communication failure point in the area is improved. A communication state analysis device, a communication state analysis method, and a communication state analysis program that can be easily visually recognized can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the communication state measuring device will be described.

FIG. 1 is a block diagram showing a configuration of the communication state measuring apparatus 1.

  In the communication state measuring apparatus 1 shown in FIG. 1, the platform circuit 11 has a circuit simulating a mobile telephone communication circuit such as a mobile phone, a PHS (Personal Handyphone System) machine, etc., and a base station (not shown) by the circuit This is a circuit for measuring a predetermined characteristic value such as a BER (Bit Error Rate) value and an RSSI (Receive Signal Strength Indicator) value indicating the radio wave state when communicating with each other in time series. Note that the circuit simulating the communication circuit of the mobile telephone is a part of the internal circuit of the mobile telephone that is extracted from the baseband circuit that communicates with the base station using a predetermined protocol.

  The GPS receiver 12 is position detecting means for receiving radio waves from a GPS (Global Positioning System) satellite (not shown) and detecting the current position.

  Further, the recording device 13 uses a predetermined characteristic value such as a BER value or an RSSI value measured at a predetermined time interval by the platform circuit 11 as information on the current position detected by the GPS receiver 12 at the measurement time. It is a recording means for sequentially recording in association with a recording medium 21 such as a hard disk device (hereinafter referred to as HDD). Note that the recording device 13 may be realized as a computer having a built-in HDD as the recording medium 21 and receive signals from the platform circuit 11 and the GPS receiver 12 via an interface such as a USB (Universal Serial Bus). Good.

  Next, the operation of the above apparatus will be described.

  The platform circuit 11 attempts to establish a line with the base station, measures a predetermined characteristic value such as a BER value and an RSSI value at a predetermined time interval (for example, 1/10 second interval) at that time, This is sequentially supplied to the recording device 13.

  On the other hand, the GPS receiver 12 receives radio waves from GPS satellites, calculates the current position of the communication state measuring apparatus 1 as needed, and supplies latitude and longitude, which are position information of the current position, to the recording apparatus 13.

  When the characteristic value is supplied from the platform circuit 11 at a predetermined time interval, the recording device 13 records the characteristic value on the recording medium 21 together with the latitude and longitude of the current position at that time. FIG. 2 is a diagram illustrating an example of a format of measurement data recorded on the recording medium 21 of the communication state measurement device 1 illustrated in FIG.

  The communication state measuring device 1 that operates in this way is installed or arranged on a moving body such as an automobile, a motorcycle, a bicycle, and the like, and the mobile body is moved in the area, so that the radio wave state in various places in the area is obtained. Corresponding characteristic values are sequentially recorded on the recording medium 21.

  FIG. 3 is a diagram illustrating an example of the movement locus 32 of the communication state measurement apparatus 1 illustrated in FIG. As shown in FIG. 3, the communication state measuring apparatus 1 is moved in an area 31 so as to pass through the entire region as much as possible, for example, as a movement locus 32. As a result, characteristic values corresponding to the radio wave conditions at various places in the area 31 can be obtained. Therefore, the area 31 has jurisdiction so that the communication state is good throughout the area 31 based on the characteristic values at the various places. It is possible to adjust the setting of the base station (antenna direction, radio wave output, etc.).

  As described above, the communication state measurement device 1 has a circuit that simulates a communication circuit of a mobile telephone, and uses a predetermined characteristic value indicating a radio wave state when communicating with a base station using the circuit in time series. A platform circuit 11 that measures the current position, a GPS receiver 12 that detects the current position, and a predetermined characteristic value (BER value, RSSI value, etc.) measured along the time series by the platform circuit 11 at that time And a recording device 13 for sequentially recording in association with information (latitude, longitude) of the current position detected by the receiver 12. As a result, it is possible to grasp the radio wave state of each place in the area 31 simply by moving the communication state measuring apparatus 1 in the mobile body by installing the communication state measuring apparatus 1 on the mobile body. A bad position can be found in a low cost and in a short time.

  Further, the communication state measuring device 1 can be in another form. FIG. 4 is a block diagram showing a configuration of a communication state measuring apparatus 1A of another form.

  In the communication state measuring apparatus 1A shown in FIG. 4, the platform circuit 11A has a function of measuring a predetermined characteristic value similarly to the platform circuit 11 of FIG. 1, and when a trigger signal is supplied from the GPS receiver 12A. It is a circuit that measures each predetermined characteristic value and supplies it to the recording device 13A. That is, as a result, the recording device 13A records each predetermined characteristic value when the trigger signal is output in association with the current position information.

  The GPS receiver 12A is a device that has a function of detecting the current position in the same manner as the GPS receiver 12 of FIG. 1 and outputs a trigger signal in synchronization with a signal received from a GPS satellite.

  FIG. 5 is a block diagram showing a configuration example of the GPS receiver 12A in FIG. In the GPS receiver 12A shown in FIG. 5, the antenna 101 is an antenna that senses radio waves from GPS satellites. The receiving circuit 102 is a circuit that receives radio waves from each GPS satellite via the antenna 101, demodulates the received signal, and extracts a C / A (Coarse Acquisition) code, a P (Precise) code, and a Y code. .

  Further, the decoding circuit 103 decodes the C / A code and the P (or Y) code that are spread spectrum PN (Pseudo-Noise) codes into data from the GPS satellites, and either code (for example, C / A code) is a circuit that calculates a pseudo distance to each GPS satellite based on the phase of the GPS satellite and outputs a timing signal synchronized with the code sequence of the code used for the calculation of the pseudo distance.

  The arithmetic circuit 104 is a circuit that calculates the current position based on pseudoranges, ephemeris information, almanac information, and the like for at least three GPS satellites obtained by the decoding circuit 103. The process for calculating the current position from these pieces of information may use a well-known method. Further, in order to reduce the error of the current position, pseudo distances from at least four GPS satellites are used.

  The trigger circuit 105 is synchronized with all of the timing signals output from the decoding circuit 103, that is, the timing signals synchronized with the code sequence of the code used for the calculation of the pseudo distance, or actually among the timing signals. This is a circuit that outputs a trigger signal in synchronization with only the timing signal for the pseudo distance used for calculation of the current position.

  Further, the recording device 13A records predetermined characteristic values such as a BER value and an RSSI value in association with the information on the current position detected by the GPS receiver 12A at the measurement time, similarly to the recording device 13 of FIG. The device has a function of sequentially recording on the medium 21, and further records a reception state of a signal (GPS signal) from a GPS satellite in association with information on the current position. FIG. 6 is a diagram showing an example of a format of measurement data recorded on the recording medium 21 of the communication state measurement device 1A shown in FIG.

  Next, the operation of the above apparatus will be described.

  In the GPS receiver 12 </ b> A, the receiving circuit 102 receives a signal from each GPS satellite via the antenna 101. The signal from the GPS satellite includes an L1 signal including a C / A code and a P (or Y) code, and an L2 signal including a P (or Y) code. The receiving circuit 102 demodulates the L1 signal and the L2 signal, extracts the C / A code and the P (or Y) code, and supplies the C / A code and the P (or Y) code to the decoding circuit 103.

  In the C / A code, one PN code is composed of 1023 bits. Since this C / A code has a bit rate of 1.023 MHz, the transmission time of the C / A code is 1 millisecond per PN code.

  The decoding circuit 103 decodes the PN code string from each GPS satellite into data, and supplies the data (ephemeris information, almanac information, and other information) to the arithmetic circuit 104.

  The decoding circuit 103 generates a C / A code or P (or Y) code similar to the C / A code or P (or Y) code from each GPS satellite, and generates the generated C / A code or P ( Alternatively, based on the phase error between the Y) code and the received C / A code or P (or Y) code, the signal transmission time from the GPS satellite to the GPS receiver 12A is calculated, and GPS signal is calculated from the signal transmission time. The pseudo distance between the satellite and the GPS receiver 12A is calculated and supplied to the arithmetic circuit 104.

  Further, the decoding circuit 103 supplies a timing signal to the trigger circuit 105 for each 1PN code of the received C / A code or P (or Y) code.

  The trigger circuit 105 supplies a trigger signal to the platform circuit 11 in synchronization with any of the timing signals. The trigger circuit 105 may output a trigger signal according to a predetermined schedule even when the signal from the GPS satellite is interrupted for a predetermined time or more and the timing signal from the decoding circuit 103 is interrupted for a predetermined time or more. .

  At this time, for example, when a timing signal is generated in synchronization with the PN code of the C / A code, the timing signal has a cycle of 1 millisecond. Therefore, when a trigger signal is output in synchronization with all timing signals, the trigger circuit 105 outputs the trigger signal at a cycle of 1 millisecond.

  On the other hand, there is a delay of 1 millisecond or more from the signal reception to the current position information output due to the computation by the computation circuit 104, and it is difficult for the computation circuit 104 to calculate the current position information in a 1 millisecond cycle. The trigger circuit 105 may output a trigger signal at a rate of once per N timing signals.

  For example, if the time required for the calculation of the current position information by the calculation circuit 104 is 100 milliseconds, the current position information can be calculated at a rate of once every 100 milliseconds, so that it is 100 (N = 100) times. At a rate of once, a trigger signal is output at a period of 100 milliseconds in synchronization with a timing signal corresponding to the PN code used for calculation of the pseudorange used at that time.

  In this case, a trigger signal may be output for any one or a plurality of codes among n (n ≧ 3) GPS satellites. Alternatively, the timing of the trigger signal may be determined by processing the reception timing of codes from a plurality of GPS satellites by averaging or the like.

  Here, the timing signal is periodically selected to generate the trigger signal. However, the decoding circuit 103 does not output the timing signal, and the trigger circuit 105 monitors the code string of the PN code and outputs a predetermined signal. You may make it output a trigger signal with a period.

  When a trigger signal is supplied from the trigger circuit 105 of the GPS receiver 12A, the platform circuit 11 measures a predetermined characteristic value at that time and supplies the measured characteristic value to the recording device 13A. On the other hand, the arithmetic circuit 104 of the GPS receiver 12A calculates the current position at the time of receiving a signal from the GPS based on the pseudo distance corresponding to the trigger signal, and supplies it to the recording device 13A.

  In this way, the current position information is supplied from the arithmetic circuit 104 of the GPS receiver 12A to the recording device 13A, and a predetermined characteristic value at the time of receiving the signal from the GPS satellite used to calculate the current position information. Is supplied from the platform circuit 11 to the recording device 13A.

  Then, the recording device 13A records the current position information (latitude and longitude of the current position) on the recording medium 21 in association with the predetermined characteristic value.

  At this time, the recording device 13A associates the reception state of the signal from the GPS satellite at that time obtained by the receiving circuit 102 of the GPS receiver 12A with the current position information and the predetermined characteristic value. To record.

  As described above, the GPS receiver 12A outputs a trigger signal in synchronization with the signal from the GPS satellite, and the recording device 13A obtains each predetermined characteristic value when the trigger signal is output from the GPS satellite. Since it is recorded in association with the information of the current position at the time of signal reception, there is almost no error between the signal reception position from the GPS satellite and the measurement position of the predetermined characteristic value, and the communication status within the area of the mobile telephone system Can detect the bad position more accurately.

  In addition, since each predetermined characteristic value is measured and supplied to the recording device 13A when the platform circuit 11 is supplied with a trigger signal, the predetermined characteristic value is measured when a signal from a GPS satellite is received. It is possible to reliably reduce the error between the reception position of the signal from the GPS satellite and the measurement position of the predetermined characteristic value. That is, the current position is output after the calculation time by the arithmetic circuit 104 from the time of signal reception, but the characteristic value is measured at the time of signal reception, so the error is reduced.

  Furthermore, since the trigger signal is output in synchronization with either the C / A code and the P (or Y) code from the GPS satellite, it is based on the detection timing of the code used for measuring the distance to the GPS satellite. Since the measurement timing of the predetermined characteristic value is determined, the error between the reception position of the signal from the GPS satellite and the measurement position of the predetermined characteristic value can be reliably reduced.

  Furthermore, the GPS receiver 12A outputs a trigger signal in synchronization with the timing of the code used for measuring the distance to the GPS satellite in any of the code strings of the C / A code and the P (or Y) code. Therefore, the measurement timing of the predetermined characteristic value can be determined at a desired integer (N) times the period of the code string of either the C / A code and the P (or Y) code.

  Furthermore, since the GPS receiver 12A outputs a trigger signal according to a predetermined schedule even when the signal from the GPS satellite is interrupted for a predetermined time or more, even if the reception state of the signal from the GPS satellite is temporarily bad The radio wave condition at each point can be continuously measured according to a predetermined schedule.

  Furthermore, since the recording device 21A records the reception state of the signal from the GPS satellite at the time of measurement of the current position in association with the information on the current position, the reception state of the signal from the GPS satellite is considered in the post-processing. You can know the communication status at each point in the area.

  Further, the communication state measuring device 1 can be in another form. FIG. 7 is a block diagram showing a configuration of a communication state measuring apparatus 1B of still another form.

  In the communication state measuring apparatus 1B shown in FIG. 7, the car navigation system 41 includes a GPS receiver 12A, a vehicle speed pulse sensor 51 that detects a vehicle speed pulse from a rotary encoder attached to an axle, and a gyro sensor that detects a running direction of the vehicle. 52, and a position detection means having a control circuit 53 for calculating the current position based on the current position information from the GPS receiver 12A and information from the vehicle speed pulse sensor 51 and the gyro sensor 52.

  The other components in FIG. 7 are the same as those in FIG.

  Next, the operation of the above apparatus will be described.

  The car navigation system 41 corrects the current position information obtained by the GPS receiver 12A as necessary based on the vehicle speed information obtained by the vehicle speed pulse sensor 51 and the traveling direction information obtained by the gyro sensor 52, and after the correction. The current position information is supplied to the recording device 13A. The car navigation system 41 calculates the current position based on the past position information, the history of vehicle speed information, the history of travel direction information, and the like even when the current position information cannot be obtained by the GPS receiver 12A.

  In addition, the car navigation system 41 supplies the trigger signal from the GPS receiver 12A to the platform circuit 11 as it is, and when the current position information cannot be obtained by the GPS receiver 12A, the car navigation system 41 triggers when calculating the current position. A signal is supplied to the platform circuit 11.

  Since other operations are the same as those in FIG. 4, the description thereof is omitted.

  In addition to the above, the time interval for calculating the current position by the car navigation system 41 may be adjusted according to the vehicle speed obtained from the vehicle speed pulse.

  As described above, since the car navigation system 41 includes the GPS receiver 12A, the vehicle speed pulse sensor 51, and the gyro sensor 52, the current position is accurately measured even when the reception state of the signal from the GPS satellite is temporarily bad. As a result, the radio wave condition at each point can be accurately measured.

  Further, even when the signal from the GPS satellite is interrupted for a predetermined time or more, the car navigation system 41 outputs a trigger signal according to a predetermined schedule, so that the GPS satellite can be used while making the apparatus inexpensive by using the car navigation system. Even when the reception state of the signal from is temporarily poor, it is possible to continuously measure the radio wave state at each point according to a predetermined schedule.

  Further, the communication state measuring device has a DGPS (Differential GPS) receiver as the GPS receiver 12A, and the recording device 13A records the reception state of the correction information at the time of measuring the current position in association with the current position information. You may do it.

  In general, a DGPS receiver acquires correction information based on a measurement error obtained by a GPS receiving base station (not shown) by an FM multiplexing method, etc., corrects current position information based on the correction information, and improves measurement accuracy. Improve.

  Further, the DGPS receiver in this communication state measuring device supplies the recording device 13A as to whether or not the current position information has been corrected using the correction information as the reception state of the correction information, and records the current position and the like. Record them in relation to them.

  In addition, since it is the same as that of the above-mentioned communication state measuring apparatuses 1A and 1B, the description is abbreviate | omitted.

  As described above, this communication state measurement device has a DGPS receiver as a position detection unit, and the recording device 13A records the reception state of correction information at the time of measurement of the current position in association with the current position information. The current position can be measured with high accuracy based on the DGPS, and the communication status at each point in the area can be known in the post-processing in consideration of the reception status of the DGPS correction information.

  Next, a communication state analysis apparatus according to an embodiment of the present invention will be described.

  FIG. 8 is a block diagram showing a configuration of the communication state analyzing apparatus 2 according to the embodiment of the present invention.

  In the communication state analysis apparatus 2 shown in FIG. 8, a computer 61 is a CPU 71 that executes a program stored in a ROM 72 or an HDD 74, such as a ROM 72 that stores a program or data necessary for startup, or a program or data that is temporarily stored when the program is executed. The apparatus includes a RAM 73 that stores data, an HDD 74 that stores various programs and data, an interface 75 such as a USB that exchanges data with an external device, and a drawing circuit 76 that performs a drawing process on the display 62.

  The HDD 74 is a recording medium for storing the communication state analysis program 81, the map data 82 in the area of the mobile telephone system, the measurement data 83 of the radio wave state in the area, and the like.

  Among these, the communication state analysis program 81 is based on the measurement data 83, the position specifying means for specifying the position where the predetermined characteristic value indicating the radio wave condition satisfies the predetermined condition, and the position specifying means. This is a program for causing the computer 61 to function as position display control means for displaying on the map a position where the specified communication state is bad.

  In addition, the measurement data 83 is a predetermined characteristic indicating position information of each place in the area and a radio wave state at the position when communicating with the base station by a circuit simulating a communication circuit of a mobile telephone. Data that contains a value.

  The display 62 is a display device as position display means for displaying a position specified by the computer 61 according to the communication state analysis program 81 on a map.

  Next, the operation of the above apparatus will be described. That is, the communication state analysis method according to the embodiment of the present invention will be described. FIG. 9 is a flowchart for explaining the operation of the communication state analysis apparatus 2 according to the embodiment of the present invention.

  First, the CPU 71 of the computer 61 acquires the measurement data 83 from, for example, the communication state measuring apparatus 1 described above (FIG. 1) according to the communication state analysis program 81 (step S1). At this time, for example, the computer 61 acquires the measurement data 83 from the communication state measurement apparatuses 1, 1A, 1B via the interface 75 and stores it in the HDD 74 as shown in FIG. Alternatively, the computer 61 drives the recording medium 21 detached from the communication state measuring devices 1, 1A, 1B by a recording medium driving device (not shown) and reads, for example, measurement data 83 as shown in FIGS. It may be. Furthermore, the measurement data 83 may be transmitted to the computer 61 from the communication state measurement apparatuses 1, 1A, 1B using wireless communication or the like.

  Next, according to the communication state analysis program 81, the CPU 71 of the computer 61 cannot properly receive and demodulate the measurement values (BER value, RSSI value, etc.) of each point in the measurement data 83 from the base station. Each is compared with a predetermined threshold value indicating a boundary whether or not a telephone call is difficult, that is, whether or not a communication state is poor (step S2).

  Then, the CPU 71 of the computer 61 specifies a position (for example, latitude and longitude) determined to be inferior in the communication state based on the comparison result in step S2 according to the communication state analysis program 81 (step S3).

  Finally, the CPU 71 of the computer 61 controls the drawing circuit 76 in accordance with the communication state analysis program 81, reads out the map data 82 of the area whose communication state is currently measured and analyzed from the HDD 74, and displays a map image of that area. In addition, an image on which an image indicating a position where the communication state is bad (hereinafter referred to as a bad communication point) is superimposed is displayed on the display 62 (step S4).

  FIG. 10 is a diagram illustrating an example of an area map and a communication failure point displayed by the communication state analysis device 2 according to the embodiment of the present invention. In FIG. 10, an image 92 showing three communication failure points is displayed superimposed on an image 91 of the area map.

  Thereby, the worker can check the communication failure point in the area by looking at the display image, and can adjust the setting of the base station having jurisdiction over the area.

  Furthermore, when the reception state of the signal from the GPS satellite and the reception state of the correction information for DGPS as described above are also recorded in the measurement data 83, the CPU 71 follows these in accordance with the communication state analysis program 81. An image showing a position where the reception state of the signal or information is bad may be further superimposed and displayed.

  Further, a GPS measurement error of the communication failure point is obtained based on the reception state, and the size, color, figure, etc. of the image 92 indicating the communication failure point is changed according to the measurement error of the communication failure point. It may be.

  As described above, according to the above-described embodiment, the computer 61 uses the position information of each place in the area of the mobile telephone system and the base station by the circuit simulating the communication circuit of the mobile telephone at that position. Based on a predetermined characteristic value indicating a radio wave state at the time of communication with, a communication failure point whose characteristic value satisfies a predetermined condition is specified, and the display 62 indicates a communication failure point specified by the computer 61. Display on the map. Thereby, even if there are a plurality of communication failure points in the area, they can be easily visually recognized, and a position where the communication state in the area of the mobile telephone system is bad can be found in a low cost and in a short time.

  Further, according to the above embodiment, since the display 62 displays the reception state of the signal from the GPS satellite at the time of measuring the characteristic value on the map, the positioning accuracy of each point such as a communication failure point in the area can be simplified. Visible to.

  Furthermore, according to the above embodiment, since the display 62 displays the reception state of the DGPS correction information at the time of measuring the characteristic value on the map, the positioning accuracy of each point such as a communication failure point in the area can be simplified. Visible to.

It is a block diagram which shows the structure of a communication state measuring apparatus. It is a figure which shows an example of the format of the measurement data recorded on the recording medium of the communication state measuring apparatus shown in FIG. It is a figure which shows an example of the movement locus | trajectory of the communication state measuring apparatus shown in FIG. It is a block diagram which shows the structure of the communication state measuring apparatus of another form. It is a block diagram which shows the structural example of the GPS receiver in FIG. It is a figure which shows an example of the format of the measurement data recorded on the recording medium of the communication state measuring apparatus shown in FIG. It is a block diagram which shows the structure of the communication state measuring apparatus of another form. It is a block diagram which shows the structure of the communication state analyzer which concerns on embodiment of this invention. It is a flowchart explaining operation | movement of the communication state analyzer which concerns on embodiment of this invention. It is a figure which shows an example of the map of the area displayed with the communication status analyzer which concerns on embodiment of this invention, and a communication failure point.

Explanation of symbols

1, 1A, 1B Communication state measuring device 2 Communication state analyzing device 61 Computer (position specifying means, position display control means)
62 Display (position display means)
81 Communication state analysis program

Claims (5)

The location information of each place in the area of the mobile phone system and the predetermined characteristic value indicating the radio wave state when communicating with the base station at the location by the circuit simulating the communication circuit of the mobile phone Based on a position specifying means for specifying a position of a communication state in which the characteristic value satisfies a predetermined condition;
A position display means for displaying on the map the position specified by the position specifying means, and for displaying on the map a reception state of a signal from a GPS satellite at the time of measuring the characteristic value;
A communication state analyzing apparatus comprising: 2. The communication state analyzing apparatus according to claim 1, wherein the position display unit displays a reception state of correction information for DGPS when the characteristic value is measured on the map. The communication according to claim 1, wherein the position display means changes at least one of a size, a color, and a figure of the image indicating the position according to a reception state of a signal from a GPS satellite. State analysis device. The location information of each place in the area of the mobile phone system and the predetermined characteristic value indicating the radio wave state when communicating with the base station at the location by the circuit simulating the communication circuit of the mobile phone On the basis of the position of the communication state in which the characteristic value satisfies a predetermined condition;
Displaying the identified position on a map;
Displaying a reception state of a signal from a GPS satellite at the time of measuring the characteristic value on the map;
A communication state analysis method comprising: The location information of each place in the area of the mobile phone system and the predetermined characteristic value indicating the radio wave state when communicating with the base station at the location by the circuit simulating the communication circuit of the mobile phone Based on a position specifying means for specifying a position of a communication state in which the characteristic value satisfies a predetermined condition, and
Position display control means for displaying on the map the position specified by the position specifying means, and for displaying on the map the reception state of a signal from a GPS satellite at the time of measuring the characteristic value;
Communication state analysis program for making a computer function as a computer.

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