JP2518153B2 - Field strength measurement system for mobile communication - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication field strength measuring system for measuring a service area of a base station which communicates with a mobile body.

[0002]

2. Description of the Related Art When wirelessly communicating with a moving body such as an automobile, the moving body usually belongs to a predetermined base station and communicates with the base station. in this case,
Since it is necessary for the base station to know how far the service can be carried out, it is necessary to know the service area. The service area is measured to measure the intensity distribution.

When measuring such a service area, conventionally, the self-contained navigation sensor consisting of a vehicle speed sensor and a geomagnetic sensor is used as a position measuring means to measure the electric field strength while confirming the measuring position. The electric field strength is measured by receiving a radio wave to be measured, performing statistical processing, and calculating a statistical amount. The relative position information and statistics obtained by this are stored as a pair of data on the magnetic tape.

[0004]

However, in such a conventional device, since there is only relative position information obtained only by the self-contained navigation sensor, it is converted to absolute position information and the service area of the service area is converted. There is a problem in that it is necessary to make a decision, and a great deal of human labor is required for the work. Therefore, it was impossible to immediately display the measurement result directly on the map. In addition, since it has only relative position information, it was difficult to apply it to different map scales and different map databases. The present invention has been made in view of such a situation, and is to accurately measure absolute position coordinates and perform service area measurement based on the measured values.

[0005]

In order to solve such a problem, the present invention provides first position measuring means for obtaining relative position coordinate data by a self-contained navigation sensor and absolute position coordinate data by GPS. a second position measuring means, and a receiving unit for receiving a radio wave to be measured in the running point during the travel of the moving body, the measured field strength by statistical processing at the receiving unit
Divide the obtained statistics into predetermined intervals and
A statistical processing unit that outputs only a specific value of the metric;
Navigation system control unit for interpolating relative position coordinate data obtained by the second position measuring unit and absolute position coordinate data obtained by the second position measuring unit to obtain accurate position information at the traveling position, and statistics. A control unit for storing the processed value based on the position information obtained by the navigation system control unit and a display unit for displaying the position information obtained by the navigation system control unit are provided. Also, radio waves from satellites are received by the GPS reception unit via the GPS antenna, and latitude and longitude information is analyzed from this reception result to obtain absolute position information, and the relative position information detected by the self-contained navigation sensor is also calculated as absolute position information. It converts to absolute position information based on the position information, matches the converted absolute position information with the information in the map data, measures the latitude and longitude, receives the radio wave of the measurement target via the measurement antenna, and processes the statistics. The statistic is measured by using the statistic, the statistic is measured while running, and the statistic is divided into sections, and the latitude / longitude information and the statistic corresponding thereto are stored in the storage unit as a pair of data.

[0006]

The GPS receiving unit detects the absolute position information by the GPS, the self-contained navigation sensor detects the relative position coordinates, and supplies them to the navigation system control unit to interpolate each other. As a result, the relative position coordinates are obtained. Is converted to absolute position coordinates. On the other hand, the radio wave to be measured is measured, and the statistically processed value is stored in the data storage unit together with the obtained position information.

[0007]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, the GPS reception unit 2 receives radio waves from a satellite via the GPS antenna 1, analyzes latitude / longitude information from the reception result, and sends the analysis result to the navigation system control unit 3. This latitude and longitude information is absolute position information, but this position information is very accurate for military use because it can use radio waves from a sufficient number of satellites, but there are limits to the satellites that can be used in the private sector. The information obtained does not provide the necessary and sufficient accuracy.

For this reason, the information of the conventional self-contained navigation sensor 6 is also used to improve the measurement accuracy. That is, relative position information is also sent from the self-contained navigation sensor 6 to the navigation system control unit 3, and the navigation system control unit 3 interpolates these two position information with each other to obtain the relative position information obtained by the self-contained navigation sensor 6. By converting the absolute position information based on the absolute position information obtained from GPS to map position matching with the absolute position information, the latitude and longitude with high accuracy are measured. Then, the latitude / longitude information is supplied to the control unit 8.

Also, in conjunction with this, GP
The radio wave to be measured is received by the receiving unit 10 via the measuring antenna 9 provided separately from the S antenna 1, and the statistical processing unit 1
In step 1, the statistical amount obtained by statistically processing the strength of the radio wave is supplied to the control unit 8.

At this time, it is ideal if the statistics supplied to the control unit 8 are continuous, but it is economically problematic to record everything in relation to the memory capacity.
Therefore, the statistic obtained while traveling is divided into predetermined sections, and the statistic of the section is, for example, 1 of the electric field strength.
Only the 0% value, 50% value, and 90% value are supplied to the control unit 8 as statistics. In this way, the measured value ranges from the worst value to a practically sufficient value, so when using statistics, it is sufficient to use an appropriate value according to the purpose,
In this way, the required statistical value can be secured even with a limited memory capacity. When only a memory having a smaller capacity can be obtained, only the median value or the value at the center distance of the measurement section may be recorded.

In the control unit 8, the latitude / longitude information and the statistic amount are treated as a pair of data and sent to the data storage unit 12 to store the data. At the same time, the control unit 8 sends the data to the navigation system control unit 3. The navigation system control unit 3 immediately displays the sent data on the display unit 4 in the navigation system 7 by adding the information of the map data 5.

Next, when it is necessary to confirm and correct the data after the measurement is completed, the data is sent from the data storage unit 12 to the control unit 8 and at the same time, the map data 5 is sent to display the data on the map. Confirm and correct the numerical information (latitude / longitude / statistics) in. Then, the data is sent again to the data storage unit 12 and stored therein.

[0013]

As described above, according to the present invention, the position information by GPS is interpolated by the position information by the self-contained navigation, the accuracy of the position information is improved, and the position information obtained in this manner is related to the measurement object. Since the electric field strength is measured, the service area can be investigated with high accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

 1 GPS antenna 2 GPS receiving unit 3 Navigation system control unit 4 Display unit 5 Map data 6 Self-contained navigation sensor 8 Control unit 9 Measuring antenna 10 Receiving unit 11 Statistical processing unit

Claims (2)

(57) [Claims] 1. A first position measuring means for obtaining relative position coordinate data by a self-contained navigation sensor, a second position measuring means for obtaining absolute position coordinate data by GPS, and a traveling position at which a moving body is traveling. It is obtained by statistically processing the receiving unit that receives the radio wave to be measured and the strength of the radio wave measured by the receiving unit .
The statistic of the section is divided into predetermined sections.
Among them, a statistical processing unit that outputs only a specific value, the relative position coordinate data obtained by the first position measuring unit, and the absolute position coordinate data obtained by the second position measuring unit are mutually interpolated. A navigation system control unit that obtains accurate position information at the traveling position, a control unit that stores the statistically processed value based on the position information obtained by the navigation system control unit, and the navigation system control unit An electric field strength measuring system for mobile communication, comprising: a display unit for displaying the obtained position information. 2. A GPS receiving section receives radio waves from a satellite via a GPS antenna, analyzes latitude and longitude information from the reception result to obtain absolute position information, and relative position information detected by an autonomous navigation sensor. Is converted to absolute position information based on this absolute position information, the converted absolute position information is matched with the information of the map data to measure the latitude and longitude, and the radio wave of the measurement target is received via the measurement antenna. Perform statistical processing to measure the statistic, measure this statistic while traveling, divide into sections, and store latitude / longitude information and the corresponding statistic as a pair of data in the storage unit. A characteristic field strength measurement system for mobile communication.