JPH10209945A - Information reporting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information reporting system based on small power radio equipment in a spread spectrum system for transmitting data such as chart symbols to the limited area. SOLUTION: Concerning the operation of a radio transmission station. an identification code is set by a flow chart 2 (S2), spread spectrum transmission is set (S4), information is transmitted by setting a timer (S5-S7), the timer is measured (H1) and in the case of time-up, transmission is continued. By the radio communication equipment for receiving information, it is judged whether a spread spectrum signal is received or not (H2), when that signal is received, the identification code is discriminated (H3), when there is the code, the presence/absence of a chart symbol is judged (H4), and when there is the symbol, chart data and position information for displaying them are memorized (S4-S13) and displayed (S14). It is judged whether or not these data are to be outputted to the electronic chart display of the external equipment (H5) and when it is required, they are outputted and displayed on the electronic chart display (S15). The presence/absence of the other information is judged (H6), when there is any other information, it is displayed (S17), the necessity of output to the outside is judged (H7) and when it is required, that information is displayed on the external equipment (S18).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an information notification system by wireless communication using a low-power wireless communication device.

[0002]

2. Description of the Related Art Conventionally, information communication services by wireless communication include television broadcasts, radio broadcasts, and specific broadcasts such as road traffic information and ship route information. As image broadcasts, weather faxes and the like are transmitted. I have. Such information notification requires extensive facilities, and the information is received and used in a wide range.

[0003] In the field of communication, there are various regulations depending on the transmission power, and a license corresponding to the transmission power is required for use. Among them, a wireless communication device with a specific low power is unnecessary as a license. This wireless communication device with a specific low power has a maximum output of 10 mW and a frequency band of 430 MHz to 2.4 GHz.
Communication was being carried out in the FM band on the band. 19
20MHz at frequency 236MHz in 1996
It has become possible to use a specific low-power wireless communication device by in-band spread spectrum. Therefore, the communication area of the conventional specific low-power wireless communication device can be greatly expanded.

[0004] For road traffic guidance of automobiles in land transportation, Ca
r Navigation System. On the other hand, for nautical vessel navigation, charts were stored on the first CD-ROM in Japan compiled and published in March 1995 based on the specifications prescribed by the International Hydrographic Organization. By using the navigational electronic chart display system mounted on the ship, this chart can be combined with a ship positioning system such as GPS or radar image and the chart information, and the position and wake of the ship are always displayed as an image. be able to.

[0005] The situation of the sea changes even when the electronic chart system for navigation is used. Therefore, a navigation warning may be issued. By the way, if you picked up the ones issued in 1996 slightly in numerical order, 532 South coast of the Korean Peninsula, east of Jeju Island, a working tower (65 meters high, 50 meters wide, with float) sinking, 143 on the 23rd
0, 33-34.2N, 127-30.3E, N
O. Survey work by the ORIENT EXPLORER, which sailed a 3,800-meter long electric wire in the Sea of Okhotsk, 1052, July 8 to November 30, 52-04
N, 143-24E, 52-49N, 143-24E,
52-49N, 143-51E, 52-28N, 144
Navigation warnings such as the sea surface surrounded by -02E, 52-04N, and 144-02E have been issued.

[0006]

In recent years, in addition to a method of writing a chart with a pencil using a ruler, a compass, or the like to display the position of a ship during navigation, a CD storing a chart is also used.
-An electronic chart display system for reading a ROM and displaying a chart has been developed and put into practical use. However, on the sea, regulations such as cautionary areas or navigation prohibition may be temporarily imposed for the safety of voyage, so that it is necessary to display a new chart chart or the like on the nautical chart or to describe the nautical chart. The present invention provides a system for informing a radio communication device of a user who is on a ship or a shore where information requiring such temporary regulation on the sea or the shore is required.

[0007]

SUMMARY OF THE INVENTION In an information notification system comprising a fixed wireless transmission station of a low power wireless communication device for transmitting information data and a wireless communication device of a user receiving the information data, a fixed wireless transmission station is provided. The transmission mode is a spread spectrum system, a timer means for repeating transmission and suspension of information data at preset intervals, an identification code transmission means for adding an identification code to the information data and transmitting the information data, and A plurality of fixed wireless transmission stations equipped with nautical information notifying means for inputting and transmitting nautical chart information including nautical charts relating to the safe navigation of vessels and information information on the marine situation are installed at predetermined intervals along the shoreline. The information transmitting side, the radio communication device of the ship receiving the information data, a means for detecting an identification code for information notification from a received signal, and a transmission when the identification code is detected. Means for temporarily storing the information data, and displaying the information data on a display, outputting the information data from an information data output terminal to an external device including an electronic chart display, and displaying the information data on the display unit of the external device. This is an information notification system that transmits and receives information data to and from a wireless communication device that converts and displays the data.

[0008] The map data of the chart to which the position information is added is added to the information data of the voyage information notifying means, the map data of the chart is organized into compressed information data by the data compression means, and the compressed information data is converted into a MODEM signal. When the plurality of fixed wireless transmission stations provided with means for transmitting and receiving the identification code of the information data from the received signal, the wireless communication device of the ship determines whether or not the signal is a MODEM signal, and determines whether or not the signal is a MODEM signal. If there is, the compressed information data is temporarily stored in the memory, and the compressed information data is converted into the original chart data by the decompression means, and output to an electronic chart display of an external device connected to the output terminal of the wireless communication device, and the map of the chart is output. Is an information notification system that transmits and receives information data to and from a wireless communication device that is displayed based on the position information.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flowchart showing a typical operation of an information notification system using a wireless communication device according to the present invention. The figure will be described. FIG. 1A is a flowchart on the transmitting side, and FIG. 1B is a flowchart on the receiving side. Explanation will be made from the transmitting side. Process the transmitter on the transmission side S
In step S2, an initialization code is set, and in step S2, an identification code is set by DTMF or MODEM. In this case, the description will be made using the DTMF signal. When the signal form is assigned to fixed radio transmitting stations installed at predetermined intervals along the shoreline in four digits using hexadecimal numbers from 0 to 9 and A to F, a code indicating information notification is represented by “＄”.
Then, a three-digit hexadecimal number “＄ ***” is assigned and set from 4096 types so that the wireless transmitting station can be specified. However, * is a number or character from 0 to 9 and A to F. As an example, a wireless transmission station for information communication on Jogashima Island in Kanagawa Prefecture has an identification code such as “$ B3C”.
In step S3, the transmission mode is set to spread spectrum, and in step S4, the transmission timer is turned on. Transmission timer is 30
Second transmission, pause for 2 minutes and 30 seconds.

In step S5, the DTMF identification code is transmitted first, followed by the symbol and number of the chart to be broadcast. Nautical charts are figures and symbols to be described in nautical charts as shown in Table 1, and are roughly divided into 22 types from A to V, and each symbol has a number classified into several tens of types. Is represented. FIG. 5 shows a typical example. In the figure, C-1 represents a contour line, G-1 is an anchorage, K-6 is a light boat, L-20.
Is a wreck buoy, O-11 is a wreck exposing a part of the hull, O
-18 is a tide chart and ripples, and P-6a is a chart chart of a separated traffic system and the like.

[Table 1]

[0011] This chart is a chart which is written on the chart for a certain period of time as a temporary measure when an item not described in the chart occurs. And the three-digit number data of the lower class are transmitted to notify the navigation warning. This chart chart “A
To V-** "with reference to FIG.
The combination of the symbol "6" and the number is transmitted. In step S6, the latitude and longitude of the position information for displaying the chart chart are transmitted. Thereafter, in process S7, other information such as a chart figure notifying a range that needs to be limited on the sea, an ocean current, a tide speed,
Transmits weather forecasts, etc. The elapsed time is measured in the decision box H1, and when three minutes set by the timer have passed, the process proceeds to step S3.
Return to and execute transmission again.

Next, the operation of the receiver of the ship station which is provided with the chart display system of the electronic chart display for navigation and receives this navigation alert will be described with reference to FIG. 1 (b). In step S8, the settings of the receiver are initialized. In the decision box H2, the synchronization between the spread signal of the receiver and the spread spectrum signal in the received signal is detected to determine whether or not the received signal has been received. When the received signal is detected, assuming that the identification code of the DTMF is, for example, the sea area of Jogashima in the decision box H3, “＄ B3
C "is detected, and if not, the process returns to the decision box H2. Upon detection, a decision box H4 for detecting a chart symbol is used to determine whether there are alphabets A to V in the chart symbol. If the above-mentioned "K-**" is set, the alphabet K is stored in the processing S9, and then the number "-**" which is further classified in the chart symbol is detected in the processing 10, and the symbol is detected in the processing 11 Memorize the lower number of.

In step S12 following step S11, the latitude and longitude position information of the marine position on which the transmitted chart is to be entered is detected, and in step S13 the latitude and longitude of the position information are stored. Next, in process S14, classification symbols and numbers of the chart chart,
The latitude and longitude of the position information are displayed, and the process moves to the decision box H5. On the other hand, if there is no chart in the decision box H4, the flow jumps to the decision box H5. In the decision box H5, it is determined whether or not to output the chart symbol information to the external output terminal, and in the output, in step S15, the chart chart is displayed at the position of the latitude and longitude detected and received on the chart screen displayed on the navigational electronic chart display or the like. Is displayed. This is because the chart charts stored in the electronic chart display and the alphabets A to V and lower numbers to be classified corresponding to the chart charts are stored in advance, and the corresponding charts correspond to the symbols to be classified and the lower numbers. The chart chart is read and the chart chart is displayed at the latitude and longitude position on the chart displayed on the navigation electronic chart display. Judgment box H5
If it is unnecessary, the process moves to the decision box H6.

Next, the presence or absence of other information is determined in a determination box H6. If there is, the other information is stored in step S16, and if not, the process returns to the decision box H2. Processing S17
To display other information stored in. Next, it is determined in a decision box H7 whether or not the information is to be output to the navigation electronic chart display. If it is unnecessary, the process returns to the decision box H2. It returns to H2 and executes reception again. Since the other information data may include a map on a marine chart, the external output signal is converted into a MODEM signal and output from the MODEM terminal.

FIG. 2 is a configuration diagram of a wireless communication device used in the information notification system of the present invention. The figure will be described. 1
Is an antenna, 2 is a transmitter, 3 is a receiver, 4 is a controller, 5
Denotes a storage unit, and 6 denotes a display unit. 7 is a low-frequency amplifier, 8 is a speaker, 9 is an output terminal for external audio equipment, 10 is a microphone, 11 is an input terminal, 12 is a DTMF / MODEM modem, 13 is a GPS antenna, 14 is a GPS receiver and The control unit 15 is a MODEM terminal for outputting information data.

The operation of the wireless communication device shown in FIG. 2 will be described from the transmitting side. Although the transmission mode is a spread spectrum system, it is better to cover a wide area on the sea, but on the land, the FM system or the AM system can be used if the range of several hundred meters is sufficiently useful. In the storage unit 5, a transmission timer for restricting transmission, identification code data, and information notification data are input and stored in advance. In this case, the transmission timer is transmitted every three minutes, the transmission period is within 30 seconds, and the remaining time is paused. The control unit 4 reads out and sets the transmission timer and the identification code from the storage unit 5, reads out the information data in advance and reads out the information notification data stored in the memory, and stores the identification code data in the DTMF / MODEM modulation / demodulation unit 1
2. Organize into DTMF or MODEM signals in 2. The transmission unit 2 transmits the identification code and the information notification data. The information notification data may be input from the microphone 10 in the case of voice or the like. In the case of data accompanied by image processing, the data can be captured and transmitted from the computer or the like through the input terminal 11.

The operation of the wireless communication device that receives the transmitted information notification data will be described. The signal detected and received by the receiver 3 is input to the DTMF / MODEM modulator / demodulator 12 to determine the presence or absence of an information notification identification code. Here, the case where the identification code is a DTMF signal will be described. Assuming that the code of the information notification is “Δ”, the DTMF signal of the radio transmission station in Jogashima is a “$ B3C” signal, and if the received identification code is not a “$ ***” code, it is invalidated and discarded. The identification code is in the range from “$ 000” to “$ FFF”. If the DTMF detected by receiving the transmission signal is the identification code of the information notification wireless communication station, the signal is taken in. If the signal is an audio signal through the low frequency amplifying unit 7, the sound is output from the speaker 8; Is output from the control unit 4 to the display unit 6 to be displayed, is converted into a MODEM signal, and is output from the MODEM terminal 15 of the control unit 4 to a computer (not shown) or an electronic nautical chart display (not shown). It is converted into a chart chart by a memory storing symbols and numbers and displayed. The signal input from the antenna 13 is converted into latitude and longitude position information by the GPS reception and control unit 14, output from the MODEM terminal 15 of the control unit 4 to the navigational electronic chart display, and converted to the latitude and longitude position of the chart. Display own ship mark.

FIG. 3 shows DS (Direct Spray).
It is a block diagram for demonstrating the spread / despread part of the communication state of the transmitter and receiver of the spread spectrum by the d) system. The figure will be described with reference to the spread spectrum signal of FIG. 21 is a primary modulation circuit of the A transmitting station, 22 is a spread modulation circuit, and 23 is a spread code generation circuit. Also 2
Reference numeral 4 denotes a B transmitting station in the area of the A transmitting station. By modulating the primary modulation circuit 21 of the A transmitting station becomes primary modulated signal (A) in FIG. 4 and outputs to spreading modulation circuit 22, the spread code F _SS from the spread code generator 23 to the spreading modulation circuit 22 The signal is input and second-modulated to form a spread spectrum signal shown in FIG. 4B, which is amplified and output as a transmission signal F _1S from the antenna A1. There is no particular limitation on the type of primary modulation, and frequency modulation FM and PSK (Phase Shift Key) are not limited.
ing). In the secondary modulation (spreading modulation), PSK modulation is generally performed using a pseudo noise code (PN code). The PN code is as random as possible and needs a certain period to extract the code on the receiver side.
Further, the B transmitting station 24 also transmits at the same frequency as the A transmitting station by the spread spectrum communication device.

Next, the C radio communication device will be described. In the figure, A2 is an antenna, 25 is a receiving circuit, 26 is a despreading circuit, 27 is a spreading code generating circuit, 28 is a narrow band filter,
29 is a synchronization detection circuit for initial acquisition / synchronization tracking / holding. Reference numeral 30 denotes a demodulation circuit. The reception signal from the antenna A2 despreads the transmission signal F _1S detected by the reception circuit 25 in the despreading circuit 26 using the spreading code from the spreading code generation circuit 27. The spread code generating circuit 27 makes the spread code of the A transmitting station coincide with the spread code of the C wireless communication device by the synchronization detection circuit 29 which executes from the initial acquisition to the synchronization tracking and holding of the spread code detected from the received signal. . This synchronization state is maintained, and the PN code, which is the spreading code, becomes the same as the spreading code F _SS of the A transmitting station. However, in the antenna A2, not only the transmission signal _F1S from the A transmission station but also the radio wave _F2S of the B transmission station 24 shown in FIG. 4C and the radio wave from other general stations Fn. Therefore, the despread signal is despread by the despreading circuit 26 using the PN code synchronized with the PN code of the transmitting station A, thereby obtaining a despread signal as shown in FIG. When the output is removed through a narrow band filter 28 to remove most components other than the transmission signal F _1S , a waveform as shown in FIG. 4E is obtained. This signal is demodulated into an original signal by passing through a demodulation circuit 30 and output. In particular, in the case of a low-power wireless communication device, there is an advantage that communication using the spread spectrum method is more resistant to noise and the communication area is expanded as compared with other communication modes.

Next, transmission and reception of information data of a marine chart will be described. The map of this nautical chart is displayed on the navigational electronic chart display.If a landfill or the like with a different terrain from that of the conventional nautical chart is made, the latitude and longitude and area of that position are displayed on the nautical chart. Since the map has to be written, it cannot be processed with the display data based on the chart. Since the map of this marine chart is a pixel signal based on a line image, even if it is transmitted at 9600 bps with a MODEM signal, the data amount is large and the transmission / reception time is long. Therefore, the information data is transmitted as compressed information data in a state where the chart figure is converted into a MODEM signal. The flowchart in FIG. 1 corresponds to other information.

[0021] When the compressed information data of the map on the chart is received by the radio communication device of the ship, it is first stored in a memory, and then the compressed data is decompressed and converted into map data on the chart.
Data compression and decompression are commonly used in personal computers and the like, and a description thereof will be omitted. The display of the wireless communication device is limited to the display of the latitude and longitude in the map data. The map data on the chart is transmitted from the MODEM terminal 15 of the control unit 4 to a computer or an electronic chart display for displaying the chart, and the map is displayed on the chart at the latitude and longitude position in the received signal on the chart.

[0022]

According to the information communication system of a radio communication device according to the present invention, in addition to a navigation method using a navigation chart, a sea area for use as a navigation alarm for a vessel equipped with a newly developed electronic chart display system. Low-power radio communication of specified location information and temporarily required chart symbols, tidal currents, current velocities, weather information, etc. in the case of warning alerts where sea areas specified by shipwrecks and workboats are off-limits for a certain period of time. An information notification transmitting station that transmits the information is provided, and the ship station that receives the information captures the chart symbols and various information and displays it directly on an electronic chart display, etc., and outputs an audio alert from the speaker to warn by warning. Has the advantage of being able to respond quickly.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation of an embodiment of a wireless communication device and an information notification system according to the present invention, in which (a) is a flowchart of a transmitting operation of a transmitting station, and (b) is a receiving operation of a wireless receiver. It is a flowchart of FIG.

FIG. 2 is a block diagram of an embodiment of a wireless communication device for an information notification and notification system according to the present invention.

FIG. 3 is a block diagram for explaining transmission and reception of spread spectrum in one embodiment of the wireless communication device for the information notification system according to the present invention.

FIG. 4 is a diagram showing a spread spectrum signal.

FIG. 5 is a diagram showing a representative example for explaining a chart diagram.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 transmission unit 3 reception unit 4 control unit 5 storage unit 6 display unit 7 low-frequency amplification unit 8 speaker 9 output terminal 10 microphone 11 input terminal 12 DTMF / MODEM modulation / demodulation unit 13 GPS antenna 14 GPS reception and control unit 15 MODEM terminal 21 Primary modulation circuit 22 Spread modulation circuit 23 Spread code generation circuit 24 Transmitting station B 25 Receiving circuit 26 Despread circuit 27 Spread code generation circuit 28 Narrow band filter 29 Initial acquisition / synchronization tracking / hold synchronization detection circuit 30 Demodulation circuit

Claims (2)

[Claims] An information broadcast system comprising a fixed wireless transmission station of a low power wireless communication device for transmitting information data and a wireless communication device of a user receiving the information data, wherein the fixed wireless transmission station sets a transmission mode. Timer means for repeating transmission and suspension of information data at a preset interval using a spread spectrum method, identification code transmission means for adding an identification code to information data for transmission, and safety of a ship in a delivery area of information data. An information transmitting side in which a plurality of fixed wireless transmitting stations equipped with nautical information notifying means for inputting and transmitting nautical information including nautical chart information and nautical status information relating to navigation are arranged at predetermined intervals along the shoreline; A radio communication device of a vessel that receives the information data, a means for detecting an identification code for information notification from a received signal, and information data transmitted when the identification code is detected. Means for temporarily storing, and displaying the information data on a display, outputting the information data from an information data output terminal to an external device including an electronic chart display, and converting the information data into video data on a display unit of the external device. An information notification system for transmitting and receiving information data to and from a wireless communication device to be displayed. 2. The voyage information notifying means according to claim 1, wherein map data of a marine chart to which position information is added is added to the information data of said voyage information notifying means, and the map data of said marine chart is organized into compressed information data by data compression means. The plurality of fixed wireless transmission stations having means for converting data to a MODEM signal and transmitting the same, and the wireless communication device of the ship, when detecting the identification code of the information data from the received signal, determines whether or not the MODEM signal,
If the compressed information data is a MODEM signal, the compressed information data is temporarily stored in the memory, and the compressed information data is converted into the original map data of the chart by the decompression means, and the converted data is output to the electronic chart display of the external device connected to the output terminal of the wireless communication device. An information notification system for transmitting and receiving information data to and from a wireless communication device that outputs and displays the information based on the position information of a map of a marine chart.