JPH0814933A - Navigation apparatus - Google Patents

Abstract

PURPOSE:To provide a navigation apparatus which is low-cost and small. CONSTITUTION:A navigation apparatus is constituted so as to be provided with a position-specifying means 2 which receives transmission information transmitted from a base station and which specifies the position of the base station on the basis of the received transmission information and with a map- information display means 3 which displays map information near the base station specified by the position-specifying means. The transmission information which is transmitted from the base station refers to discrimination information which discriminates the base station. The position-specifying means 2 specifies the position of the base station on the basis of the discrimination information. The map-information display means 3 is provided with a storage part which stores the map information near the base station corresponding to respective base stations, and it is constituted so as to display the map information near the base station corresponding to the base station specified by the position- specifying means 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device, and more particularly, to a navigation device which uses a digital cordless telephone to provide guidance to a destination.

[0002]

2. Description of the Related Art Conventionally, as a navigation device for a mobile body, most of them, except for products using geomagnetism, most receive GPS (Global Positioning System) which receives radio waves transmitted from satellites to calculate the current position. Has become.

The GPS stores map information in a memory in advance and receives a predetermined radio wave signal transmitted from an artificial satellite to calculate its own current position based on the received signal, and the calculated current position. Is combined with the map information on the memory and displayed on the display device.

[0004]

However, in such a conventional navigation device, a GPS which receives a radio wave signal transmitted from an artificial satellite is used to calculate the current position of the navigation device. Because it was
There were the following problems.

That is, since the receiving device for receiving the radio waves from the artificial satellite has a high cost, and the cost of the receiving device portion is high in the total cost of the navigation device, the navigation device itself is considerably expensive. It has become a thing.

Further, in a navigation device using GPS, since the device itself becomes large, for example, a digital cordless telephone or a PDA (Personal Digital Assista) is used.
nts: portable information devices) and other small communication devices cannot be applied, resulting in poor usability.

[0007]

An object of the present invention is to provide an inexpensive and compact navigation device.

[0008]

According to the first aspect of the present invention,
As shown in FIG. 1, while receiving the transmission information transmitted from the base station, the position specifying means 2 for specifying the position of the base station on the basis of the received transmission information, and the position specifying means specified by the position specifying means. And a map information display means 3 for displaying map information of the vicinity of the base station.

In addition to the invention described in claim 1, the transmission information transmitted from the base station is identification information for identifying the base station, as shown in FIG. The position specifying means 2 specifies the position of the base station based on the identification information, and the map information display means 3
Has a storage unit for storing map information around the base stations corresponding to the respective base stations, and it is effective to display the map information around the base stations corresponding to the base stations specified by the position specifying means 2. Is.

In addition to the invention according to claim 1 or claim 2, the invention according to claim 3 includes, in the map information displayed by the map information display means 3, as shown in FIG. , The current position, the azimuth at the current position, and an arbitrary position that is the target position, and the input unit 4 based on the map scale of the map information displayed by the map information display unit 3. Based on the azimuth at the current position and the azimuth from the current position to the target position input by the input unit 4, the distance calculation unit 5 calculates the distance between the target position and the current position. Direction calculating means 6 for calculating a direction with respect to
It is effective that the map information display means 3 displays the distance calculated by the distance calculation means 5 and the direction calculated by the direction calculation means 6.

Further, in the invention described in claim 4, as shown in FIG. 2, in addition to the invention described in claim 1 or 2, the map information displayed by the map information display means 3 is displayed. An input unit 4 for inputting an arbitrary position to be a target position, and the target position input by the input unit 4 and the base station based on the map scale of the map information displayed by the map information display unit 3. A distance calculating means 5 for calculating a distance between them, an azimuth detecting means 7 for detecting an azimuth at the current position, an azimuth detected by the azimuth detecting means 7 and a target position input by the input means 4 from the base station. Direction calculation means 6 for calculating the direction from the base station to the target position based on the azimuth with respect to
It is effective that the map information display means 3 displays the distance calculated by the distance calculation means 5 and the direction calculated by the direction calculation means 6.

In this case, in addition to the invention described in claim 1 or claim 2, the map information display means 3 corresponds to map information in the vicinity of each base station. It is effective to have a memory that stores map information around the base station.

According to the sixth aspect of the present invention, as shown in FIG. 3, the position specifying means 2 receives the transmission information transmitted from the base station and specifies the position of the base station based on the received transmission information. And a current position specifying unit 8 for specifying the current position based on the direction of the base station specified by the position specifying unit 2 with respect to the current position, and a map displaying map information around the current position specified by the current position specifying unit 8. Information display means 3, input means 4 for inputting an arbitrary position which is a target position in the map information displayed by the map information display means 3, and map scale of the map information displayed by the map information display means 3. The distance calculation unit 5 calculates the distance between the target position input by the input unit 4 and the current position based on the above, and displays the calculated distance.
And azimuth detecting means 7 for detecting the azimuth at the current position
And based on the azimuth detected by the azimuth detecting means 7 and the azimuth with respect to the target position input from the base station by the input means 4, a direction from the current position to the target position is calculated, and the calculated direction is displayed. And a direction calculation means 5 for performing the calculation.

Further, in this case, as shown in FIG. 3, in the invention described in claim 7, in addition to the invention described in claim 6, the present location specifying means 8 has the base station as a center. It is effective to divide the transmission area into a predetermined number, specify the area where the current position is present based on the direction to the base station from the center of each divided area, and set the center position of the area as the current position.

[0015]

According to the invention described in claim 1, the position specifying means receives the transmission information transmitted from the base station, specifies the position of the base station based on the received transmission information, and The map information display means displays the map information around the specified base station.

That is, in the present invention, since the transmission information transmitted from the base station is used as the navigation information, the device size is reduced and the device is inexpensive as compared with the conventional example using GPS. Is obtained.

According to the invention described in claim 2, in addition to the invention described in claim 1, the transmission information transmitted from the base station becomes identification information for identifying the base station, and the position specifying means is used. The position of the base station is specified based on the identification information, and the map information near the base station stored in the storage unit of the map information display means is displayed by the map information display means.

Thus, in the present invention, the transmission information transmitted from the base station is used as the navigation information, and the map information around the base station to be displayed in the storage unit is stored. Similar to the invention described in 1, the device size can be reduced and an inexpensive device can be obtained as compared with the conventional example using GPS.

According to the invention described in claim 3, in addition to the invention described in claim 1 or 2, the present position in the map information displayed by the map information display means is inputted by the input means. When the azimuth at the current position and an arbitrary position that is the target position are input, the distance calculation means calculates the distance between the input target position and the current position based on the map scale of the map information. The direction calculation means calculates the direction from the current position to the target position, and the map information display means displays the distance calculated by the distance calculation means and the direction calculated by the direction calculation means.

Thus, according to the present invention, the distance information and the direction information from the current position to the target position can be easily obtained based on the input current position.

In this case, according to the invention of claim 4,
In addition to the invention described in claim 1 or claim 2 above, in the map information displayed by the map information display means,
When an arbitrary position that is the target position is input by the input unit, the distance calculation unit calculates the distance between the input target position and the current position based on the map scale of the map information, and the azimuth detection unit. The direction calculation means calculates the direction from the current position to the target position based on the azimuth at the current position detected by, and the map information display means calculates the distance calculated by the distance calculation means and the direction calculated by the direction calculation means. Is displayed.

Thus, in the present invention, the current position is assumed to be the base station position, so that even if the input of the current position is omitted, as compared with the invention described in claim 1 or 2, It can be used easily.

In this case, according to the invention described in claim 5, in addition to the invention described in claim 1 or 2, the map information display means stores map information in the vicinity of each base station. By providing the memory, the map information around the base station is promptly extracted from the specified base station, and the extracted map information is easily displayed.

According to the sixth aspect of the invention, the transmission information transmitted from the base station is received by the position specifying means, and the current position specifying means is operated by the current position specifying means based on the direction of the base station based on the received transmission information. The current position is specified, the map information around the specified current position is displayed by the map information display means, and an arbitrary position which is the target position is input by the input means in the map information displayed by the map information display means. Then, the distance calculation means calculates and displays the distance between the target position input based on the map scale of the map information and the current position, and the direction calculation means calculates the direction from the current position to the target position. Is displayed.

Thus, in the present invention, the present position is accurately detected even if the input of the present position is omitted by specifying the present position by the present position specifying means, and the distance information from the present position to the target position is obtained. Direction information and information can be easily obtained.

Further, in this case, according to the invention described in claim 7, in addition to the invention described in claim 6, the current location specifying means divides the transmission area centered on the base station into a predetermined number. By specifying the region where the current position is based on the direction from the center of each divided region to the base station, the current position can be specified more accurately than when the current position is the base station position.

[0027]

EXAMPLES Examples will be described below with reference to FIGS.

4 to 11 are views showing an embodiment of the navigation device according to the present invention. 4 to 11
In FIG. 3, the same parts as those in FIGS.

First, the structure will be described.

FIG. 4 shows the navigation device 1 of this embodiment.
3 is a block diagram showing the overall configuration of FIG.

In FIG. 4, the navigation device 1 according to the present embodiment has a PHS (Personal Handy phone System).
This is a navigation device 1
Is an antenna 11, a high frequency section 12, a modem section 13, a TD
MA (Time Division Multiple Access) unit 14, speech codec unit 15, PCM (Palse Code Modulatio)
n) Codec unit 16, amplifier 17, speaker 18, microphone 19, display unit 21, map memory 22, control unit 23,
ROM 24, RAM 25, recording / reproducing circuit 26, memory 27,
It is composed of a key input unit 28 and a direction sensor 29.
Incidentally, X is a crystal oscillator provided in the PCM codec section 16.

The antenna 11 transmits / receives voice data to / from a predetermined base station when used as a PHS, and CS-ID (base station identification information) transmitted from the base station when used as a navigation device. ) Is for receiving.

As shown in FIG. 4, the high frequency section 12 includes a changeover switch 31, a receiver 32, and a PLL (Phase Locked Loo).
p) It is composed of a synthesizer 33 and a transmitter 34, and performs frequency conversion processing.

The change-over switch 31 receives the radio wave from the base station based on the control signal from the control section 23.
It is switched to the receiver 32 side, and is switched to the transmitter 34 side when transmitting radio waves to the base station.

When the signal input from the antenna 11 is input via the changeover switch 31 for distributing the transmission / reception, the receiver 32 causes the reception signal to be transmitted by a three-stage mixer.
From 1.9 GHz to around 250 MHz (1stIF), around 10 MHz (2ndIF), and further 1 MHz
Frequency conversion is performed on an IF signal in the vicinity (3rdIF).

The PLL synthesizer 33 outputs a local oscillation signal for frequency conversion in the receiver 32 and the transmitter 34.

The transmitter 34 receives the modulated wave of π / 4 shift QPSK input from the modem section 13 by a two-stage mixer.
The frequency is converted from MHz to around 250 MHz and further to the 1.9 GHz band, and the antenna 11 is switched through the changeover switch 31.
It radiates from.

The modem unit 13 performs a π / 4 shift QPSK modulation / demodulation process. Specifically, at the time of reception, the modem unit 13 demodulates IQ data from the IF signal input from the receiver 32 and further demodulates it. The converted signal is converted into a serial data string and transferred to the TDMA unit 14. On the other hand, at the time of transmission, the data transferred from the TDMA unit 14 is changed to IQ.
Data is created to generate a π / 4 shift QPSK modulated wave, and the π / 4 shift QPSK modulated wave is output to the transmitter 34.

The TDMA unit 14 performs frame synchronization and data transmission / reception processing. Specifically, at the time of reception, a unique word (synchronization signal) is received from the received data sent from the modem unit 13. Extracts and synchronizes the frame, and the control data section in this received data,
Descrambling of the voice data section is performed, control data is transferred to the control section 23, and voice data is transferred to the speech codec section 15, while at the time of transmission,
Control data or the like is added to the voice data transferred from the speech codec unit 15 to create transmission data, and after scrambled or the like, a unique word or the like is added to format and inserted at a predetermined timing of the TDMA frame. And outputs it to the modem unit 13.

The speech codec section 15 performs compression / expansion processing of digital audio data. Specifically, at the time of reception, the ADPCM audio signal (4 bit × 8 kHz = 32 kb) sent from the TDMA section 14 is received.
ps) is a PCM audio signal (8 bit × 8 kHz = 64 k)
bps) to decompress and output to the PCM codec section 16, and at the time of transmission, the PCM audio signal sent from the PCM codec section 16 is AD.
TDM by compressing by encoding into PCM audio signal
It is output to the A section 14.

The PCM codec section 16 performs analog / digital conversion processing. Specifically, at the time of reception, the PCM audio signal sent from the speech codec section 15 is D / A converted and converted. The analog voice signal obtained by the above is output to the amplifier, while the analog voice signal input from the microphone 19 is A / D-converted at the time of transmission, and the PCM voice signal which is the digital voice signal obtained by the conversion is converted into the speech codec. It is output to the unit 15. Also, P
The CM codec unit 16 also controls the volume of the audio signal, the ringer, and the tone signal.

The amplifier 17 amplifies the analog audio signal sent from the PCM codec section 16, and the speaker 1
The speaker 18 outputs the sound to the outside based on the sound signal amplified by the amplifier 17 in the receiver of the PHS.

The microphone 19 is set to P in the transmitter of the PHS.
It is for inputting an audio signal to the CM codec unit 16.

The display unit 21 is composed of a simple matrix liquid crystal display device (LCD: Liquid Crystal Display) and displays a predetermined image instructed by the control unit 23.

The map memory 22 is a memory for storing map information around each base station corresponding to a plurality of base stations.

The control unit 23 outputs various control signals to each unit in the navigation device 1 based on a predetermined program stored in the ROM 24 to control the entire device.

The ROM 24 is a semiconductor memory for storing programs and data used in the navigation device 1, and the RAM 25 stores program data and the like used during program processing of the control unit 23.
A semiconductor memory used as a work area.

The recording / reproducing circuit 26, when used as a PHS, records the message message transmitted from the other party or reproduces the recorded message message of the other party in the absence recording mode. 27 is
When used as a PHS, it is a memory for storing a response message to the other party in the answering machine mode and reproducing the response message in response to an incoming call.

The key input unit 28 is used for the navigation device 1.
For giving instructions based on various operations by the operator.

The azimuth sensor 29 is used in the navigation device 1.
This is a sensor for detecting the direction in which the navigation device 1 is currently facing, with reference to one predetermined direction.

Next, the operation of this embodiment will be described with reference to FIGS.

FIGS. 5 and 6 are flowcharts for explaining the guidance system processing in the navigation device 1 in this embodiment.

The navigation device 1 of the present embodiment has a PH
Since it can also be used as S, it is first checked whether or not the navigation mode switch provided in the key input unit 28 has been pressed, thereby checking whether or not it is used as a guidance system (step S1).

Here, if the navigation mode switch is not pressed in the key input unit 28, the guidance system is not used (step S2) and is used as PHS, while the navigation mode switch is turned on in the process of step S1. If it is pressed, it is determined that the guidance system is used.

When the guidance system use mode is entered, it is checked whether or not it is currently in the area of the public base station (step S3). If it does not belong to any public base station area, the guidance system is used. No (step S4), the fact that it is outside the area is displayed on the display unit 21 (step S5).

In the process of step S3, when it is determined that the public base station is within the area, the CS-ID transmitted from the public base station to the digital cordless telephone including the PHS is detected (step S6). This CS-
The ID is collated with the database information stored in the ROM 24 as shown in FIG. 7, and the position of the corresponding public base station is determined.

That is, in the ROM 24, as shown in FIG. 7, the CS-ID, the position of the CS corresponding to the CS-ID, the data area information of the map information of the CS corresponding to the CS-ID, and the scale information of the map. Etc. are stored, CS
-When the ID is detected, the position of the CS, the map information, the scale of the map, etc. can be immediately known.

Therefore, first, the detected CS-ID
If the detected CS-ID does not exist in the base station registered in the ROM 24 by collating with the database in the ROM 24 based on the above, the state search operation cannot be performed as shown in FIG. 8A. A message 1 (“location search impossible”) is displayed, and the detected CS-ID is in the ROM 24.
In the case where the base station is registered in, the position where the base station exists is recognized as the position where the user is (assuming that the scale of the map is 1 / 50,000, as shown in FIG. Even if the communication area has a radius of 500 m, its own position on the map display is substantially the same because it is within a radius of 1 cm from the base station.) As shown in FIG. 2 (“Shinjuku Station West Exit”) is displayed (steps S7 and S8).

Then, as shown in FIG. 8C, the map information stored in the map memory 22 is displayed on the display unit 21 based on the data area information of the map information of the corresponding base station (step S9). , S10).

Next, the entire circumference is divided into 360, for example, true north is 0 °, true south is 180 °, true east is + 90 °, and true west is -9.
The azimuth information of 0 ° is input by operating the key input unit 28 (step S11), and from the azimuth information input with the specific direction of the navigation device 1 as a reference,
The direction in which the user is currently facing is calculated with respect to the orientation of the map (step S12), and as shown in FIG. 9, the direction in which the user is currently facing is displayed by an arrow (step S12).
13).

At this time, if the azimuth information obtained by the azimuth sensor 29 and the azimuth of the map information are displayed so as to always coincide with each other, the direction in which the user is facing coincides with the direction of the displayed map information. Steps S11 to S13
The processing of can be omitted.

Here, it is checked whether or not the destination is input (step S14). If the destination is not input, the guidance system ends (step S15).

On the other hand, in the processing of step S14, when the destination is input, as shown in FIG. 10, the distance to the destination from the position of the user and the input point and the scale information of the map, the map The direction of the destination with respect to the azimuth is calculated (step S16).

Specifically, if the position coordinates of the user on the map (that is, the position of the base station in this case) is the reference point (0, 0) and the destination is (x, y), the target is from the own position. The distance (r) to the ground is calculated according to [Equation 1] r = √ (x ² + y ² ), and the error of the radius of the transmission area at the base station is taken into consideration, as shown in FIG. A message 3 indicating the distance to the ground ("rm to destination") is displayed (step S17).

When the own direction with respect to the direction of the map obtained previously is (θ ₁ ), the direction (θ ₂ ) to the destination on the map with respect to the direction of the map is [Equation 2] θ ₂ = tan ⁻¹ (Y / x) (0 ° ≦ θ ₂ <360 °).

Next, the direction of the destination with respect to the direction in which the user is facing is calculated from the direction in which the user is facing with respect to the direction of the map and the direction of the destination with respect to the direction of the map (step S18).

That is, the azimuth (θ ₃ ) to the destination on the map with respect to the own azimuth is [Equation 3] (when 0 ° ≦ θ ₂ <270 °) θ ₃ = θ ₂ −90 ° (270 ° ≦ θ ₂ <360 °) θ ₃ = θ ₂ −450 ° is obtained. As a result, as shown in FIG.
The direction of the destination with respect to the direction in which the user is facing is displayed (step S19).

As described above, in the present embodiment, the navigation system is realized by the conventional navigation device using GPS in order to realize the guidance system based on the transmission information (CS-ID) transmitted from the base station as the navigation information. In comparison, the device size can be reduced and an inexpensive device can be obtained.

By assuming the current position to be the base station position, the input of the current position is omitted, and it can be used more easily.

FIG. 12 is a diagram for explaining a method of calculating the current position in another embodiment.

In the above-described embodiment, the guidance system is realized by assuming the current position as the position of the base station, but in this embodiment, as shown in FIG. In the case of the embodiment, the current position is divided into four (A, B, C, D), and by determining which divided area the current position belongs to, the current position is divided into the center position (in this case, the point) of the divided area. a), b, c, or d), which makes it possible to detect the current position more accurately even when the input of the current position is omitted as compared with the above-described embodiment. it can.

As a specific method of determining which divided area the user belongs to, for example, when using the guidance system, a non-directional receiving antenna is normally provided with directivity, and 360 degrees around the current position. By measuring the electric field strength from the base station, the direction of the base station position from the current position can be easily obtained, and the divided area can be specified from the obtained direction.

Therefore, the current position can be obtained more accurately than in the above-mentioned embodiment using the base station as a reference. By the way, although the accuracy is increased by increasing the number of divisions, it is preferable to determine the number of divisions in consideration of a measurement error such as a direction.

Although the above-mentioned embodiment describes the case where the navigation device 1 is applied to a digital cordless telephone, the present invention is not limited to this, and the navigation device 1 is not limited to this.
Of course, it may be used alone.

[0075]

According to the first aspect of the invention, the position specifying means receives the transmission information transmitted from the base station, specifies the position of the base station based on the received transmission information, and specifies the position. The map information display means displays the map information in the vicinity of the base station.

Therefore, in the present invention, by using the transmission information transmitted from the base station as the navigation information, the device size can be reduced and the inexpensive device can be provided as compared with the conventional example using GPS. Obtainable.

According to the second aspect of the invention, the transmission information transmitted from the base station serves as identification information for identifying the base station, and the position identifying means identifies the position of the base station based on the identification information, and a map is created. The map information display means displays the map information around the base station stored in the storage unit of the information display means.

Therefore, in the present invention, the above-mentioned claim 1
In addition to the invention described in, as navigation information,
By using the transmission information transmitted from the base station and storing the map information of the vicinity of the base station to be displayed in the storage unit, as in the case of the above-mentioned invention of claim 1, a conventional example using GPS is provided. In comparison, the device size can be reduced and an inexpensive device can be obtained.

According to the third aspect of the present invention, when the current position, the azimuth at the current position, and an arbitrary position which is the target position are input by the input unit in the map information displayed by the map information display unit, the distance is calculated. The calculating unit calculates the distance between the target position and the current position input based on the map scale of the map information, the direction calculating unit calculates the direction from the current position to the target position, and the map information displaying unit calculates the distance. The distance calculated by the calculation means and the direction calculated by the direction calculation means are displayed.

Therefore, in the present invention, the above-mentioned claim 1
Alternatively, in addition to the invention described in 2, it is possible to easily obtain distance information and direction information from the current position to the target position based on the input current position.

In this case, according to the invention described in claim 4, when an arbitrary position which is a target position is inputted by the input means in the map information displayed by the map information display means, the map scale of the map information is made by the distance calculation means. While calculating the distance between the target position and the current position entered based on
Based on the azimuth at the current position detected by the azimuth detecting unit, the direction calculating unit calculates the direction from the current position to the target position, and the map information displaying unit calculates the distance calculated by the distance calculating unit and the direction calculating unit. Display direction and.

Therefore, in the present invention, by assuming that the current position is the base station position, compared with the invention according to claim 1 or 2, the current position is omitted even if the input of the current position is omitted. Is set as the base station position,
It can be used more easily.

Further, in this case, in the invention described in claim 5, the map information display means is provided with a memory for storing map information in the vicinity of each base station, whereby the above-mentioned claim 1 or 2 is described. In addition to the invention, the map information around the base station can be promptly extracted from the specified base station, and the extracted map information can be easily displayed.

According to the sixth aspect of the invention, the position specifying means receives the transmission information transmitted from the base station, and the present position is specified by the present position specifying means from the direction to the current position of the base station based on the received transmission information. Then, while displaying the specified map information around the present location by the map information display means and inputting an arbitrary position as the target position by the input means in the map information displayed by the map information display means, the distance calculation means The distance between the target position input based on the map scale of the map information and the current position is calculated and displayed, and the direction from the current position to the target position is calculated and displayed by the direction calculation means.

Thus, in the present invention, the current position is specified by the current position specifying means, so that the current position can be accurately detected even if the input of the current position is omitted.
It is possible to easily obtain the distance information and the direction information from the current position to the target position.

Further, in this case, according to the invention of claim 7, the present location specifying means divides the transmission area centered on the base station into a predetermined number, and based on the direction from the center of each divided area to the base station. By specifying the region where the current position is, in addition to the invention described in claim 6 described above, it is possible to specify the current position more accurately than the one in which the base station position is set as the current position.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a navigation device according to claim 1 of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a navigation device according to claim 2 of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a navigation device according to claim 3 of the present invention.

FIG. 4 is a block diagram showing the overall configuration of the navigation device of this embodiment.

FIG. 5 is a flowchart for explaining a guidance system process in the navigation device according to the present embodiment.

FIG. 6 is a flowchart for explaining the guidance system processing in the navigation device of the present embodiment, following FIG.

FIG. 7 is a diagram showing an example of database information stored in a ROM.

8 is a diagram for explaining a guidance system process in FIG.

9 is a diagram for explaining a guidance system process in FIG.

10 is a diagram for explaining the guidance system process in FIG. 6 subsequent to FIG. 9;

11 is a diagram for explaining the guidance system process in FIG. 6 subsequent to FIG.

FIG. 12 is a diagram for explaining a method of calculating the current position in another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Navigation device 2 Position specifying means 3 Map information display means 4 Input means 5 Distance calculating means 6 Direction calculating means 7 Direction detecting means 8 Current location specifying means 11 Antenna 12 High frequency part 13 Modem part 14 TDMA part 15 Speech codec part 16 PCM codec part 17 Amplifier 18 Speaker 19 Microphone 21 Display 22 Map memory 23 Control 24 ROM 25 RAM 26 Recording / playback circuit 27 Memory 28 Key input 29 Orientation sensor 31 Changeover switch 32 Receiver 33 PLL synthesizer 34 Transmitter X Crystal oscillator

Claims (7)

[Claims] 1. A position specifying means for receiving transmission information transmitted from a base station and specifying the position of the base station based on the received transmission information, and the vicinity of the base station specified by the position specifying means. And a map information display unit that displays the map information of the navigation device. 2. The transmission information transmitted from the base station is identification information for identifying the base station, and the position specifying means specifies the position of the base station based on the identification information, and the map information display. The means has a storage unit for storing map information around base stations corresponding to respective base stations, and displays map information around base stations corresponding to the base stations specified by the position specifying means. The navigation device according to claim 1. 3. An input unit for inputting a current position, an azimuth at the current position, and an arbitrary position as a target position in the map information displayed by the map information display unit, and displayed by the map information display unit. Distance calculation means for calculating the distance between the target position input by the input means and the current position based on the map scale of the map information, and the target from the azimuth and the current position at the current position input by the input means. Direction calculating means for calculating a direction from the current position to the target position based on the azimuth with respect to the position, and the map information displaying means calculates the distance calculated by the distance calculating means and the direction calculating means. The navigation device according to claim 1 or 2, wherein the direction is displayed. 4. The input means for inputting an arbitrary position as a target position in the map information displayed by the map information display means, and the map scale of the map information displayed by the map information display means. Distance calculating means for calculating the distance between the target position input by the input means and the base station, azimuth detecting means for detecting the azimuth at the current position, azimuth detected by the azimuth detecting means and the base station. From the base station based on the azimuth with respect to the target position input by the input means from the base station, and the map information display means is calculated by the distance calculation means. 3. The navigation device according to claim 1, wherein the distance and the direction calculated by the direction calculation means are displayed. 5. The navigation according to claim 1, wherein the map information display means has a memory for storing map information around the base station corresponding to identification information around each base station. apparatus. 6. A position specifying means for receiving the transmission information transmitted from the base station and specifying the position of the base station on the basis of the received transmission information, and the base station specified by the position specifying means. A current position specifying means for specifying the current position based on the direction with respect to the current position, a map information display means for displaying map information near the current position specified by the current position specifying means, and a map information displayed by the map information display means An input means for inputting an arbitrary position which is a destination position, and a distance between the destination position input by the input means and the current position based on the map scale of the map information displayed by the map information display means. A distance calculating means for calculating and displaying the calculated distance, an azimuth detecting means for detecting an azimuth at the current position, and an azimuth detecting means for detecting the azimuth at the present position. Based on the azimuth and the azimuth with respect to the target position input by the input means from the base station, the direction calculation means for calculating the direction from the current position to the target position and displaying the calculated direction, Navigation device. 7. The present location specifying means divides a transmission area centered on the base station into a predetermined number,
7. The region in which the current position is present is specified based on the direction of the base station from the center of each divided region, and the center position of the region is set as the current position.
The described navigation device.