JPH03126199A - Information display system for vehicle - Google Patents

Abstract

PURPOSE:To drive a vehicle with a driver more appropriately by also displaying the information of another vehicle traveling in the neighborhood of its own vehicle with that of its own vehicle on a screen on which a road map is displayed. CONSTITUTION:A navigation device A which detects the present location of the vehicle and displays it on the screen with a peripheral map is provided, and the information of its own vehicle is modulated and transmitted from an its own vehicle information transmission means (a) corresponding to position data detected with the navigation device A. Also, an another vehicle information reception means (b) demodulates the data of another vehicle transmitted from another vehicle traveling in the neighborhood of its own vehicle, and receives the information of another vehicle. Furthermore, an another vehicle information synthesizes means (c) synthesizes and displays the information of its own vehicle with the information of another vehicle displayed on the screen with the peripheral map. In such a way, since the position information of another vehicle traveling in the neighborhood of its own vehicle can be displayed on the screen on which the peripheral map is displayed also with the position information of its own vehicle, etc., the driver can drive the vehicle more appropriately.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a vehicle information display system.

(Prior Art) As a conventional device of this type, for example, a traffic signal 50 shown in FIG. The controller controls the display contents of the signal light 52 and controls the progress of vehicles entering the intersection 53.

(Problems to be Solved by the Invention) However, the conventional traffic signals as described above have the following problems.

(1) First, it is not possible to install it at all intersections throughout the country due to installation cost and effectiveness, as well as physical constraints.

(2) Even if your vehicle complies with traffic rules and drives safely, if the other vehicle is careless or ignores traffic lights,
Accidents at the beginning of encounters are inevitable.

(3) Also, when an emergency vehicle such as an ambulance or fire engine approaches, or a public vehicle such as a bus approaches, the relative positional relationship between the other vehicle and your own vehicle cannot be determined.
Failure to properly yield to such vehicles.

Therefore, the present invention has been made in view of the problems described in ``-2'', and its purpose is to display information on other vehicles in the vicinity of the own vehicle along with own vehicle information on the display screen on which a road map is displayed. To provide a vehicle information display system that can also display other vehicle information and provide information on other vehicles so that the driver can drive more appropriately.

(Means for Solving the Problems) In order to solve the problems as described above, the present invention is constructed as shown in FIG.
The vehicle is equipped with a navigation device A that detects the current location of the vehicle and displays the location on a screen together with a surrounding map.

Then, in the own vehicle information transmitting means a, the own vehicle information is modulated according to the position data detected by the navigation device A and transmitted.

Further, the other vehicle information receiving means demodulates other vehicle data transmitted from another vehicle near the own vehicle in accordance with the position data detected by the navigation device, and receives other vehicle information.

Further, in the other vehicle information synthesis display means C, other vehicle information is synthesized and displayed on the screen on which the own vehicle information is displayed together with the surrounding map.

(Function) In this invention, on the screen displaying the surrounding map, the position information of the own vehicle and the position information of other vehicles traveling near the own vehicle are also displayed. Since the driver can obtain information about other vehicles even when driving, the driver can drive more appropriately.

(Explanation of Examples) The present invention will be explained below based on the drawings.

FIG. 2 is an overall configuration diagram showing one embodiment of the present invention.

As shown in the figure, a vehicle information display system 100 to which the present invention is applied includes a navigation device A, an in-vehicle communication device B, and an information processing device C.

Here, the navigation equipment f? jA calculates the vehicle's current position and displays own vehicle information along with a surrounding road map on the entire display screen. That is, GPS (Gro
A satellite utilization device 1, such as a GPS satellite (Bal Positioning System) or Geostar, measures the current position of the vehicle with high precision by receiving radio waves from a GPS satellite via an antenna 1a, or by transmitting and receiving radio waves via a GPS satellite. ing. Note that the positioning error in this case is within 10 m.

Further, the CD-ROM 6 stores detailed map information for the entire country, and surrounding maps are sequentially read out as the vehicle travels.

By the way, reception of radio waves from GPS satellites is blocked in built-up areas, and positioning data can only be obtained from the satellite-based positioning device 1 intermittently.

Therefore, in this case, the current position is calculated using a well-known dead reckoning method, and the optical gyro 2. The output signals of the geomagnetic sensor 3 and vehicle speed sensor 4 are set to 1.
The positioning calculation device 6 consisting of a 6-bit CPU is manually operated,
The current position is calculated based on the positioning data of the satellite-based positioning device 1. In this case, the optical gyro 2 measures the two-dimensional behavior of the vehicle using inertial navigation, the geomagnetic sensor 3 measures the traveling direction of the vehicle, and the vehicle speed sensor 4 measures the distance traveled by the vehicle. Measured.

In addition to the dead reckoning means described above, this embodiment is equipped with a current position calculation means called map matching, and if the travel trajectory for a certain distance traveled in the past is obtained by the dead reckoning means, Locus shape and”-2CD
- The road shape of the corresponding area stored in the ROM 6 is compared and verified, and if the two match with a matching degree over a certain amount, the current position is corrected to the current position calculated by the dead reckoning means.

Note that the positioning error due to this map matching is also within 10 m.

In this way, the navigation device A has obtained the position information, heading information, and traveling speed information of the own vehicle, and this vehicle information is input to the information processing device C together with surrounding road map information.

Note that 7 is a display made of a CRT or the like, and as will be described later, information on other vehicles traveling nearby is displayed on this display 7'2 as well as information on the own vehicle.

On the other hand, the in-vehicle communication device B is a low-power wireless equipment that can communicate with other vehicles several hundred meters away from the own vehicle with a transmission output of about 10 mW, and as described above, the vehicle information, that is, the position information of the own vehicle, is transmitted by the navigation device A.

When the heading information and traveling speed information are manually input to the information processing device C, the information processing device C adds the ID code of the own vehicle, which is a unique number for identifying the vehicle, and these information are transferred to the in-vehicle communication device B. signal processing unit 1 in
Sent to 0.

Then, in this signal processing unit 10, the ID code (=J added) own vehicle information is converted into a Gold code (or M-sequence code) and sent to the transmitter 11.

The transmitter 11 uses these converted codes to transmit 1.2
A spread spectrum (frequency distribution) signal of the GH7 band is generated, and this spread spectrum signal is transmitted from the antenna 13 to other cars in the vicinity via the duplexer 12.

In this way, own vehicle information, that is, own vehicle location information.

The heading information, traveling speed information, and ID code information will be superimposed on a 1.2 GH2 band spread spectrum radio wave with an output of about 10 mW and will be transmitted to the surroundings of the own vehicle.

On the other hand, the antenna 13 receives information about another vehicle equipped with a similar device, that is, the other vehicle's 1.2GH2 band spread spectrum signal, and these signals are transmitted to the duplexer 1.
2 to the receiver 14. And receiver 1
In step 4, signal processing such as amplification and detection is performed to generate the gold code (
Alternatively, the other vehicle information converted into M-sequence code), that is, the other vehicle's position information, heading information, traveling speed information, and ID code information, is detected.

Note that when transmitting and receiving data between a plurality of vehicles using a specific frequency band such as the 1.2 GH band, there is a risk of interference because a large number of vehicle data are transmitted and received at the same time. Therefore, in this embodiment, a spread spectrum communication method as described in "-" is adopted, and each vehicle information is converted into specific encoded information, and the transmitted radio wave is high-speed modulated with the code and transmitted as a spread spectrum radio wave. , on the receiving side, interference is prevented by sequentially decoding the codes.

In this way, the other vehicle information detected by the receiver 14 is input to the information processing device C via the signal processing unit 10, and is used as the own vehicle information already sent from the navigation device A side, that is, the position information of the own vehicle.

It is displayed on the display 7 along with the traveling direction information, the traveling speed information, and the surrounding road map information centered on the own vehicle.

The following is the basic configuration of this embodiment.Next, the in-vehicle communication device B, which is a characteristic part of this embodiment, will be described in further detail with reference to the circuit configuration diagram in FIG.

First, the own vehicle information Co output from the information processing device C
(Position information, heading information, traveling speed information.

ID code information) is manually input to the signal processing unit 10 and sent to the CPU 22 via the I10 controller 21.

Next, in the CPU 22, the own vehicle information is stored in a Gold code (or M-sequence code) in a serial binary code format with a code speed IMbps corresponding to the position data and a code sequence length of 25 fbits, and other information (heading information, traveling speed information). , ID code information) into a composite code Ro.

Then, this superimposed composite code Ro is sent to the frequency synthesizer 30 via the 10 controller 23.

In the frequency synthesizer 30, a prescaler 32 divides the ultra-high frequency signal of 1.2 GH band with a frequency f11 outputted from the voltage controlled oscillator 31, and the divided output Q
PLI (included in the serial binary code composite code Ro corresponding to device information configured from O and I10 controller 23 side), (Phase Loclc Loo)
pp) 33, an analog voltage corresponding to the difference between the two outputs is generated and fed back to the voltage controlled oscillator 31. Thereby, the oscillation frequency ft1 output from the voltage controlled oscillator 31 is controlled.

In this manner, the frequency synthesizer 30 generates a spread spectrum signal in the 1.2 GHz band using the encoded information of the steering wheel based on the Gold code (or M-sequence code) corresponding to the position information of the steering wheel.

Next, this spread spectrum signal is sent to the Bandhus filter 34 to remove high frequency components and limit the spectral distribution of the transmitted radio wave to a predetermined level, and the power amplifier 35 amplifies the output to a level of several tens of milliwatts. be done. Then, the antenna 13 is connected via the duplexer 12.
It is transmitted as a hopping modulated spread spectrum radio wave with a frequency of 1°2 GH7. In this way, the own vehicle information (position information, heading information, traveling speed information, ID code information) is transmitted as repeated information at a predetermined period.

On the other hand, the antenna 13 receives information (
Location information, heading information, traveling speed information.

ID code information) is received as a spread spectrum radio wave, and this other vehicle information is guided to the receiver 14 via the duplexer 12.

The received signal S;° is first filtered by a preamplifier 44 to remove noise components and amplified to a predetermined level, and then filtered by a bandpass filter 45 to remove high frequency components from the output components of the frequency synthesizer 40. It is mixed with the emitted signal in a mixer 46. Thereafter, the received spread spectrum signal is demodulated by taking the correlation between the received signal and the local signal.

Here, I will briefly explain the specific demodulation method.
Since the radio waves transmitted from each vehicle are subjected to spread spectrum modulation based on the position data of that vehicle, the output frequency f1 of the frequency synthesizer 40. is a Gold code (or M-sequence code) R1 for demodulation based on the own vehicle position data output from the signal 5 processing unit 10.
, is controlled according to the above and the studs so that the value corresponds to .

That is, the frequency f output from the voltage controlled oscillator 41
1. The high frequency signal is divided by the prescaler 42, and the divided output Qr and the gold code RI for demodulation are compared by the PLL 43 to generate an analog voltage corresponding to the difference between the two outputs. The frequency f4 of the high frequency signal output from the i7 controlled oscillator 41. The value of is made to correspond to the demodulation code.

By the way, in this embodiment, detection of other cars around the own car is as follows:
As shown in FIG. 4, the vehicle position is set to the origin position 0 of the X and Y coordinates, and the search is performed counterclockwise at 5 m intervals with the origin 0 as the center.

Therefore, the voltage controlled oscillator 41 outputs the next search position coordinate P. Demodulation gold marks corresponding to (n=1, 2, 3, . . . ) are generated sequentially at a period of 1 ms.

That is, as shown in FIG. 4, the own vehicle position is X.

Set the origin 0- of the Y coordinate -1- to Pl*P2r
P3+P7. The demodulated Gold codes R, , corresponding to the positions of . . . are sequentially generated within a radius of 100 m.

Then, the frequency f corresponding to this demodulated Gold code R,
The received signal for which the frequency correlation was obtained with the local oscillator signal of l is!
This will be automatically selected by the F amplifier 47. Then, this received signal is converted into an IF multiplied signal and sent to the IF amplifier 4.
7, and a detector 48 consisting of an FM detector, etc.
Information on other vehicles (heading direction information, traveling speed information, ID code information) superimposed on the received signal is detected, and guided to the signal control unit 10 where it is demodulated. The other vehicle information C4 is sent from the signal processing unit 10 to the information processing device C.

In this way, set the own vehicle position to the origin position, and press X.

Other vehicle search point P on the Y coordinate. is shifted every 5 m with a cycle of 1 ms, and the other vehicle search point P is shifted. Frequency f7. corresponding to the position data. The received signals are sequentially generated by sequentially generating a local oscillation signal, mixed with a large number of spread spectrum received signals, and correlated in frequency, and the received signals are sequentially demodulated, and other vehicle information C is superimposed on the signals. Direction information, traveling speed information, I
D code information) is detected accurately.

In the explanation of Fig. 4, the search point Pn is changed spirally in a counterclockwise direction by coordinate transformation at 5 m intervals with the origin as the center, but in reality, the search point Pn is changed using the road map data around the own vehicle. P that exists on the road "2" and its vicinity. All you have to do is extract only the points and demodulate the received signal.
This allows other vehicle information to be detected efficiently in a short time.

Next, FIG. 5 shows the relative positions of the own vehicle 60 and another vehicle 61 displayed on the display 7.

In the same figure, the direction of the arrow protrusion of the own vehicle 60 and the other vehicle 61 indicates the direction of travel of each vehicle, and the number after each vehicle represents the traveling speed (unit per hour; K m / h) of each vehicle. .

In this way, in this embodiment, the relative situation (position, direction of travel,
(traveling speed) is made so that it can be read visually,
The target vehicle that the driver should pay attention to in relation to the progress of the own vehicle can be clearly identified on the map on the display 7, and the driver can drive more appropriately.

Here, the positional status of the own vehicle 60 and the other vehicle 61 is simply displayed on the display 7, but the information processing device C estimates and calculates the status of the other vehicle approaching the own vehicle. The vehicle may be configured to have its mark blinked or to output a warning of the approach of another vehicle in case the driver is not looking at the display to draw the driver's attention.

This embodiment uses the navigation device A and the in-vehicle communication device B ()1 to transmit own vehicle information to surrounding vehicles, and to separately receive information from other nearby vehicles. The map 1- on Display 7 displays the situation of other cars as well as the own car, allowing the driver to grasp the situation of other cars around the own car, making it easier to judge the situation when overtaking or changing course. can also be used.

It is also possible to grasp the situation even in places with poor visibility, such as curved roads.

Furthermore, since it is possible to accurately detect the approach of an emergency vehicle such as a police force, an ambulance, or a firefighter, or a public vehicle such as a bus, the driver can smoothly take necessary measures.

Further, even when a plurality of cars are traveling as a group for leisure, business, etc., the situation of each other's vehicles can be accurately known, making it easier to travel.

Furthermore, this system can be used to manage the operation of commercial vehicles and provide operational assistance in emergencies if the infrastructure side is developed to access communication networks on both the ground and the ground.

It can be useful for a variety of social needs, such as security measures for VIPs and cash cars, detection and rescue of injured or ill drivers, etc.

(Effects of the Invention) As described in -1-, the vehicle information display system according to the present invention displays information on other vehicles in the vicinity of the own vehicle together with information on the own vehicle on the screen on which the road map is displayed. , the driver can drive more appropriately.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a corresponding diagram of clay 1 of the present invention, Fig. 2 is an overall configuration diagram of an embodiment to which the present invention is applied, and Fig. 3 is a detailed diagram of the in-vehicle communication device in Fig. 2. Circuit diagram, Figure 4 is an explanatory diagram of the operation when other vehicles near the own vehicle are detected centered on the own vehicle position,
FIG. 5 is an explanatory diagram when information on other vehicles is displayed together with own vehicle information on the display screen, and FIG. 6 is an explanatory diagram of a conventional example. A...Navigation device B...In-vehicle communication device C...Information processing device 7...Display 10...Signal processing unit 11... ...Transmitter 12 ...Duplexer 13 ...Antenna 14 ...Receiver

Claims (1)

[Scope of Claims] 1. In a vehicle information display system equipped with a navigation device that detects the current position of a vehicle and displays the detected position on a screen together with a surrounding map, according to position data detected by the navigation device, own vehicle information transmitting means for modulating and transmitting own vehicle information; and demodulating other vehicle data transmitted from other vehicles near the own vehicle according to position data detected by the navigation device, and transmitting other vehicle information. A vehicle information display system comprising: another vehicle information receiving means for receiving information; and another vehicle information synthetic display means for displaying the other vehicle information in a composite manner on a screen on which own vehicle information is displayed together with a surrounding map. .