KR20020087208A - Wireless image transfer system using satellite of ground bed - Google Patents

Abstract

PURPOSE: A wireless image transmission system using a ground satellite system is provided to read image and character information satellite-transmitted via a cable by mounting a satellite antenna on the ground and a satellite receiver underground. CONSTITUTION: A wireless image transmission system using a ground satellite system includes a ground satellite antenna(100) mounted on the ground for transmitting information data on various images and characters via satellite communication, an image transmitting unit mounted in a subway station for receiving the satellite information data on the images and characters received from the ground satellite antenna, and an image receiving unit mounted in a running passenger train for receiving the satellite information data transmitted from the image transmitting unit to display via a monitor in the passenger train.

Description

Wireless image transmission system using terrestrial satellites {WIRELESS IMAGE TRANSFER SYSTEM USING SATELLITE OF GROUND BED}

The present invention relates to a wireless image transmission system using a terrestrial satellite. More particularly, the present invention relates to a wireless video transmission system for wirelessly implementing satellite information containing images and texts transmitted through satellites on the ground through monitors installed in subway cars.

Recently, due to the serious traffic jams on the roads, public transportation such as subways and buses is being used a lot. In particular, the subway is most widely used as a public transportation, and the number of users is increasing year by year.

Accordingly, additional subway lines are being constructed, and service improvements such as improving the internal environment of subway stations or adding facilities for the convenience of the users are gradually being made.

However, due to the nature of the subway, most of the operating sections consist of underground spaces, so most of the passengers spend time involuntarily to sleep or look at advertisements attached to the interior of the train. many.

In other words, passengers often look at people on the other side of the newspaper or try to force their sleep when there are no newspapers or other attractions.

As a known technique for solving this problem, "application number: 20-2000-0023508, name of the invention: information transmission system for subway electric cars" is presented.

It is designed to allow passengers to acquire various information while boarding by providing video information such as major news, stock information, life information, and advertisements in real time through a terminal installed inside the electric vehicle using the Internet network.

However, the above known technology requires a plurality of servers in order to acquire various video information through a terminal in a vehicle using the Internet, and the servers must satisfy the precondition that they must be connected to each other through a wired / wireless LAN. do.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide passengers with a variety of useful video and text information through each monitor installed in a subway car using a satellite device on the ground. The present invention provides a wireless video information system.

As a technical idea for achieving the above object of the present invention

A terrestrial satellite antenna installed on the ground for receiving information data on various images and texts through satellite communication;

An image transmission transmitting means installed in a subway station and receiving satellite information data of an image and a text received from the terrestrial satellite antenna;

Wireless image transmission system using a terrestrial satellite, characterized in that it comprises a video transmission receiving means installed in the carriage of the electric vehicle in operation and wirelessly receiving satellite information data transmitted from the image transmission transmitting means and displayed on the monitor in each passenger vehicle. This is provided.

1 is a view schematically showing a wireless image transmission system using a terrestrial satellite according to the present invention.

2 is a block diagram of an overall wireless video transmission system.

FIG. 3 is a diagram illustrating a transmitter of the wireless video transmission system shown in FIG. 2.

4 is a diagram illustrating a receiver of the wireless video transmission system shown in FIG. 2.

<Description of the symbols for the main parts of the drawings>

10: satellite antenna 20: coaxial cable

30: wireless video transmission transmitter

40: wireless video transmission receiver

100: ground phase antenna 200: power supply

220: satellite receiver 240: video and text transmission unit

260: transmission channel unit 280: transmission antenna

300: receiving antenna 320: receiving channel unit

340: Image and text receiver 360: Monitor

380: power supply

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

1 is a diagram schematically showing a wireless video transmission system using a terrestrial satellite according to the present invention, Figure 2 is a block diagram of the overall wireless video transmission system. 3 is a diagram showing a transmitter of the wireless video transmission system shown in FIG. 2, and FIG. 4 is a diagram showing a receiver of the wireless video transmission system shown in FIG.

Referring to Figure 1, a variety of satellite information transmitted from the terrestrial satellite image via the satellite image 10 in the ground by the coaxial cable 20 to connect the ground and underground through the wireless image transmission apparatus 30 installed in the subway station And satellite information containing characters. Of course, the wireless image transmission transmitter 30 is equipped with a satellite receiver.

In this state, the wireless image transmission transmitter 30 wirelessly transmits the received satellite information to the monitor in each passenger vehicle through the wireless image transmission receiver 40 installed in the driver's seat of the driving electric vehicle.

Subsequently, referring to the wireless video transmission system shown in FIG. A transmission unit installed in the subway station; It is divided into a receiver installed in the driver's seat of the electric vehicle.

First, the terrestrial antenna unit is provided with a terrestrial satellite antenna 100 for receiving information data on various images and texts through satellite communications on the ground.

The transmitting unit includes a power supply unit 200 for stably supplying power of the transmitting side wireless system; A satellite receiver (220) for receiving and reading satellite information data for various images and texts from the terrestrial satellite antenna (100); An image and text transmission unit 240 for transmitting the satellite reception information data read from the satellite receiver 220 into a passenger car of an electric vehicle; A transmission channel unit 260 for transmitting an image and text data signal output from the image and text transmission unit 240 through a predetermined channel; And a transmission antenna 280 for transmitting the image and text data signals outputted from the transmission channel unit 260 to the receiving side by radio.

At this time, because the coaxial cable 20 is connected between the ground antenna part of the ground and the transmitter installed in the underground station, it is possible to directly receive information data on various images and texts from the satellite communication on the ground.

In addition, the transmission channel unit 260 has an output level of 10mW, is composed of four channels (CH) and is transmitted in the 2.410 ~ 2.470 GHz frequency range, and uses the FM modulation PLL scheme.

In addition, as the transmission antenna 280, a horn antenna (Horn ANT), a grid antenna (GRID ANT), a parabolic antenna (Parabolic ANT) is used.

Preferably, in the present invention, the screen splitter is mounted on the transmitting side of the subway station so that the image and text data according to the screen can be divided and transmitted by using the wireless image transmission transmitter 30.

The receiving unit includes a receiving antenna 300 for receiving an image and a text data signal transmitted from the transmitting antenna 280 by wireless; A reception channel unit 320 for receiving the image and text data received from the reception antenna 300 through a predetermined channel; A video and text receiver 340 for receiving a video and text data selected by the channel from the reception channel 320 and transmitted through satellite communication; A monitor unit 360 for displaying the image and text data output from the image and text receiver 340 through a monitor installed in a vehicle; It comprises a power supply unit 380 for stably supplying the power of the receiving system.

In this case, the reception antenna 300 uses a horn antenna (Horn ANT), a grid antenna (Grid ANT), a parabolic antenna (Parabolic ANT) as a directional antenna.

In addition, the receiving channel unit 320 is composed of four channels (CH) are received in the 2.410 ~ 2.470 GHz frequency range, the reception level is -85dBm.

At this time, the receiving channel unit 320 is assigned to the channel of the station in each station in the train progress direction, four channels are provided to automatically convert the channel cyclically under the control of the automatic selection channel controller do.

In addition, the monitor 360 is preferably installed in each passenger car in the most convenient place to look at the monitor in the passenger seat facing each other.

Preferably, the monitor unit 360 of the present invention can acquire a variety of information through the monitor installed in each passenger vehicle through the wireless image receiver 40 to the image and text data transmitted from the screen divider of the transmitter installed in the subway station have.

Next, referring to FIG. 3, a wireless video transmission apparatus 30 installed in a subway station by a coaxial cable 20 connecting various types of satellite information transmitted from a terrestrial satellite to the ground and the ground through a satellite antenna part 100 on the ground. The satellite receiver 220 reads the satellite information containing the image and text transmitted through the satellite.

The satellite information read by the satellite receiver 220 is transmitted to the wireless image transmission and reception device 40 installed in the driver's seat of the electric vehicle in operation through the transmission antenna 280.

Referring to FIG. 4, the monitor unit 360 installed in each passenger vehicle through the wireless image transmission receiver 40 receives the image and text data signals transmitted from the transmission antenna 280 by wireless. Various images and text information are displayed.

As described above, according to the wireless video transmission system using the terrestrial satellite according to the present invention has the following effects.

First, the wireless image transmission system of the present invention can receive satellite information stably without interference of radio waves by installing satellite receivers on the ground and satellite receivers on the transmitting side of the ground to read image and text information transmitted via coaxial cable. Can be.

Second, the wireless image transmission system of the present invention can reduce the cost of installing the system by wirelessly receiving satellite information on the monitor installed in each passenger car of the running electric vehicle.

Third, in the wireless image transmission system of the present invention, passengers can acquire various information such as weather and living information through images and texts through a monitor installed inside a passenger car even while boarding a subway.

On the other hand, while the technical spirit of the present invention has been described with reference to the accompanying drawings, which is illustrative of the preferred embodiments of the present invention by way of example and not limiting the present invention without departing from the scope of the technical spirit of the present invention Various modifications and combinations will be possible.

Claims (6)

A terrestrial satellite antenna installed on the ground for receiving information data on various images and texts through satellite communication; An image transmission transmitting means installed in a subway station and receiving satellite information data of an image and a text received from the terrestrial satellite antenna; Wireless image transmission system using a terrestrial satellite, characterized in that it comprises a video transmission receiving means installed in the carriage of the electric vehicle in operation and wirelessly receiving satellite information data transmitted from the image transmission transmitting means and displayed on the monitor in each passenger vehicle. . The method of claim 1, wherein the image transmission transmitting means A power supply unit for stably supplying power of a transmission image transmission system; A satellite receiver for receiving and reading satellite information data of various images and texts from the terrestrial satellite antenna; An image and text transmission unit for transmitting the satellite reception information data read from the satellite receiver into the passenger car of the electric vehicle; A transmission channel section for transmitting the video and text data signals outputted from the video and text transmission section through a predetermined channel; And a transmission antenna for transmitting the image and text data signals outputted from the transmission channel unit to the receiving side by radio. The terrestrial satellite according to claim 1 or 2, wherein the terrestrial satellite antenna portion and the image transmission transmitting means are connected by coaxial cable to directly receive information data on various images and texts from the satellite communication on the ground. Wireless video transmission system using. The subway platform of claim 2, wherein the transmission channel unit has an output level of 10 mW, is composed of four channels (CHs), and is transmitted within a frequency range of 2.410 to 2.470 GHz, and uses an FM modulation PLL scheme. Wireless monitoring system for line surveillance. The method according to claim 1, wherein the image transmission receiving means A reception antenna for receiving an image and text data signal transmitted from the transmission antenna by radio; A reception channel unit for receiving the image and text data received from the reception antenna through a predetermined channel; A video and text receiver for receiving a video and text data selected by the channel and transmitted through satellite communication; A monitor unit for displaying the image and text data outputted from the video and text receiver through a monitor installed in the vehicle; Wireless image transmission system using a terrestrial satellite, characterized in that further comprising a power supply for stably supplying the power of the image transmission system of the receiving side. The wireless video transmission system using a terrestrial satellite according to claim 5, wherein the reception channel unit is composed of four channels and is received within a frequency range of 2.410 to 2.470 GHz, and has a reception level of -85 dBm.