JPS5950378A - Device for confirming position of moving body - Google Patents

Abstract

PURPOSE:To confirm easily a position of the own station, by utilizing a mobile radio, etc. in which an automobile becomes a mobile station, ena executing a radio wave communication between a fixed station whose position is already known and the own station (mobile station). CONSTITUTION:When an FM modulating signal FO is transmitted from a fixed statin A, an FM modulating signal FO' is sent back synchronously from a mobile station in accordance with said transmission. A distance to the mobile station B is derived in a CPU5, by detecting a beat frequency fR based on a phase difference tR between the transmitting signal FO and the receiving signal FO', and deriving the time required for propagation of the receiving radio wave. A radio wave arrival direction from the mobile station B is measured by a direction finder 2. The CPU5 calculates a relative position of the mobile station B, derives an absolute position of the mobile station B which makes a position of a fixed station A an absolute reference, and transmits it to the mobile station B together with a map signal from a map signal generator 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile object position confirmation device that performs position confirmation of a mobile object such as an automobile by wireless communication.

Conventionally, in order to ask for guidance in unfamiliar areas, the distance traveled from the starting point of the car and the distance! ,) While detecting changes in direction as the vehicle travels, the vehicle's position on the two-dimensional coordinates is calculated moment by moment, and displayed on the screen of a display on which a road map of the planned area is set in advance. A device that displays the current position in 7 lines has been developed, but such a device is a complicated system that includes a rate sensor such as a gyroscope, a distance sensor, and an arithmetic processing unit with 9 displays. In addition to having to carry it on a car, it is also necessary to prepare a large number of special maps for each region.

The present invention has been made in consideration of these points, and aims to simplify on-vehicle equipment and to enable highly accurate location confirmation of the own vehicle by using a mobile radio system using a vehicle as a mobile station. By using this method, radio communication can be performed between a fixed station whose location is known (using a relay station for mobile telephones may be considered) and the own station (mobile station). The present invention provides a moving body position fN@M recognition device that allows easy confirmation.

The mobile object position confirmation device according to the present invention performs communication 7 using specific radio waves between a mobile station and a fixed station, calculates the distance 7 of the mobile station from the propagation time of the radio waves transmitted and received at the fixed station, and The direction in which the radio waves arrive from the station is detected and the relative position of the mobile station is determined (υ). From the measurement results, the position of the mobile station on the map with the fixed station as the absolute reference is calculated. is sent to the mobile station along with regular map information, and the current location is displayed on the mobile station's display.
It was made to be done.

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

In the mobile object position confirmation device according to the present invention, as shown in FIG. A wireless communication device 1 that detects a beat frequency caused by a phase difference caused by the time it takes for radio waves to propagate; a direction finder 2 that uses a directional antenna to detect the direction in which radio waves arrive at the other station; Based on the map data storage medium 3 in which specific map data is stored, and the map data extracted from the storage medium 3, slow scanning is performed.
The distance of the mobile station B is determined from the beat frequency 71-1 detected by the map signal generator 4 which generates the signal Y and the radio communication device 1, and the distance to the mobile station B is detected by the direction finder 2. Measure the relative position of mobile station B from both directions, and from the measurement results, determine the position of mobile station B on the map using the position of fixed station A as an absolute reference, and calculate the absolute position 1α of mobile station B. The data is transmitted together with the map signal to the mobile station B through the wireless communication device 1, and is also configured by the C'PU 5, which performs the overall control on the fixed station A side.

Also, mobile station Bil! In 1, the current position is displayed based on the wireless communication device 6 that performs radio wave communication 7 with the fixed station A, and the absolute position data and map signal of the mobile station B sent from the fixed station A. The CPU 8 controls the wireless communication device 6 and the display 7.

Furthermore, in the wireless communication equipment R11c of the fixed station Aill, as shown in FIG.
, triangular wave signal generation circuit ■2, and oscillation frequency fl f o
A modulator 13 that modulates the Y triangular wave signal, and a transmitter 1 that transmits the FM modulated signal FOχ to the mobile station B.
4, a receiver I5 that receives the same FM modulated signal returned from the mobile station B in response to the transmission, and a beat frequency detection circuit that detects the beat frequency fR of the transmitted signal FO and the received signal F6. It consists of 16. Also,
Although not particularly shown, the wireless communication device 6 on the mobile station B side receives the FM modulated 11M signal FOk (F) from the fixed station AE-, etc., and synchronizes and returns the same FM modulated signal F6 to the fixed station A. It is configured to be 几℃.

In the mobile object position confirmation device according to the present invention configured as described above, in response to a position confirmation request from the mobile station B (for example, made by normal wireless communication by conversation), the fixed station A
When the mobile station 371 synchronizes with the FM modulation signal F and sends the FM modulation signal F, the fixed station A transmits the transmission signal FO and the reception signal F6. As shown in Fig. m3, the transmission signal F and the reception signal FO depend on the propagation time of the transmission and reception radio waves between the fixed station A and the mobile station B.
By detecting the beat frequency fR based on the phase difference tR, the propagation time required for the transmitted and received radio waves can be determined.
In the PU 5, the distance to the mobile station B can be determined by calculation. Actually, since it is suitable for simultaneous transmission and reception at the same frequency fO, the frequency component of the signal Fo' returned from mobile station B is expressed as fO + Δf.
It is set in advance to be shifted by Δf from O.

In addition, in the mobile object position confirmation device by IJIJIC,
Unlike the conventional Renida device, which uses directional radio waves to scan and measure the distance to the other party using waves and reflections from the other party, it uses mobile radio, etc., which uses a car as a mobile station. Communication of radio waves using a specific frequency signal between a fixed station and a mobile station using existing equipment 7
Since the distance measurement is performed in advance, the distance between a fixed station and a mobile station can be easily and accurately measured without the need for special equipment such as radar. I can do it -! It looks like a radar with j + h I, there is no possibility that measurement outside the range is impossible,
First, it should be possible to measure distances over a wide range where wave communication is possible.

At the same time, the fixed station A uses the direction finder 2 to detect the mobile station B.
The direction of arrival of the radio waves 'k6+11 of l- et al. is determined. that time,
The radio wave reception status of each element can be switched by rotating one homologous antenna 360° horizontally to determine the direction in which the radio waves are strongest, or by using an antenna with multiple elements arranged in each antenna in advance. Yo! There are means for sequentially switching and for detecting the element receiving the strongest radio waves and measuring the direction.

As above [6! ! Based on the determined distance and direction of the movement 8B, the CPU 5 calculates the relative position of the mobile station B,
Arithmetic processing is performed to determine the absolute position 2 of station B in two-dimensional coordinates that are used as an absolute reference for positioning the fixed station, and the result is used together with the map signal from the map signal generator 4 to the wireless communication device 1'. Mobile station B transmits TfC through g. In addition,
The map is created using the position of fixed station A as a reference, and the arithmetic processing to determine the absolute position of mobile station B is performed according to the scale of the map. .

Further, when reading map data from the map data storage medium 3, the absolute position of the mobile station B or the data of the existing area are read out under the control of the CPU and the map signal generator 4
I'm going to have a good time.

71) Then, at mobile station B 1lill, fixed station A
7) Based on the position signal and map signal of the own station sent from the station, the mark of the own station device M is displayed on the map displayed on the screen of the display 7, as shown in FIG. let

As described above, in the mobile object position confirmation device according to the present invention, the current position of the mobile station B on the map can be displayed on the display 7 of the mobile station B, and the driver can see the position of the own vehicle in °C.
This will make it easier to confirm (a) so that it can be done accurately. - Furthermore, in the mobile object position confirmation device according to the present invention, the fixed station A
A means for transmitting additional information such as road information and traffic information is provided on the side, and when transmitting location and map information to mobile station B,
At the same time, mobile station B receives the latest road information in the area.
It is possible to have the company provide services. Note that the additional information may be notified by voice using the microphone of the IfQ-free communication device 6 of the mobile station B, or by the display 70.
It may also be displayed in characters on the screen.

Furthermore, the mobile object position confirmation device according to the present invention is provided with a means for specifying a destination by specifying a destination on a map displayed on the screen VC of the display device 7 at the mobile station B, 14 data χ is transmitted to the fixed station A, and the fixed station A side calculates the current position It of the mobile station B based on the sent destination position data. The optimal course on the map leading to the destination is determined by computer processing, and the data of the determined optimal course is transmitted to the mobile station BIC.
The current location will be displayed on the V display 7 screen.

It is also an oral skill to have the user display a guide showing the optimal course to reach the destination.

As described above, the mobile object position confirmation device according to the present invention includes means for transmitting wireless radio waves between a fixed station and a mobile station and measuring the distance to the mobile station from the phase difference of the received radio waves; A direction detection means for detecting the arrival direction of radio waves from a mobile station, and a means for determining the absolute position on a map with a fixed station as a reference position from the distance and direction of the mobile station that have been measured in detail. , the information on the location found in ft is map information,
It is constructed by means for transmitting information to a mobile station by radio, and means for causing a display to display the current position of the mobile body based on the transmitted information.
It has the excellent advantage of being able to confirm the current position of a moving object with high precision and effectively simplifying on-vehicle equipment. Moreover, especially in the present invention, equipment such as mobile telephones can be used as is, and the use of the equipment can be expanded.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing an example of a practical implementation of a mobile object position confirmation device according to the present invention, FIG. 2 is a block ratio diagram showing an example of a configuration of a wireless communication device on the fixed station side in the same embodiment, and FIG. 4 is a diagram showing the characteristics of transmitted and received radio waves, and FIG. 4 is a diagram showing an example of the screen display state of the display device in the same embodiment. 1.6...Wireless communication device 2...Direction finder 3...
・J sequential data storage medium 4...Map signal generator 5
, 8...CI)U 7...Representative for display device applicant
Kiyoshi Karasui Figure 2 To CPU5 Figure 3 Funeral Figure 4

Claims (1)

[Claims] means for performing wireless radio communication between a fixed station and a mobile station, transmitting and measuring the distance to the mobile station from the phase difference of received radio waves; and direction detecting means for detecting the direction of arrival of radio waves from the mobile station; There is a means for requesting the absolute position on a map with the fixed station as the reference position based on the distance and direction of the mobile station that has been carefully measured, and wirelessly transmitting the information on the determined position along with the map information to the mobile station. means for transmitting by f
'L'''C A means for causing a display to display the current position of the moving body based on the received information.