KR100897451B1 - Mobile Station of controlling Power Source according to Height Data - Google Patents

Abstract

Disclosed is a mobile communication terminal in which power is automatically turned off according to the altitude of an airplane. The GPS (Global Positioning System) signal repeater provided in the plane receives a GPS signal from the satellite and amplifies it. The amplified GPS signal is transmitted to the mobile communication terminal in the plane. The mobile communication terminal extracts location information of the airplane from the received GPS signal, and compares the current altitude value included in the obtained location information with a reference value. When the altitude value exceeds the reference value, the power of the mobile communication terminal is automatically cut off.

Description

Mobile station of controlling power source according to altitude {Mobile Station of controlling Power Source according to Height Data}

1 is a diagram illustrating a network system for calculating an altitude at which a mobile communication terminal is located by using a GPS signal according to a preferred embodiment of the present invention.

2 is a block diagram illustrating a mobile communication terminal for calculating an altitude using a GPS signal according to a preferred embodiment of the present invention.

3 is a user interface screen showing a menu displayed for inputting a reference value to a conditional unit according to a preferred embodiment of the present invention.

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

100,100a, 100b, 100c, 100d: satellite

200: GPS signal repeater 300: mobile communication terminal

310: position input unit 320: conditional

330: calculator 340: power supply

The present invention relates to a communication system using a mobile communication terminal, and more particularly, to a communication system for calculating a position using a mobile communication terminal in an airplane, and automatically turning off the power of the mobile communication terminal according to a result of the calculation. It is about.

State-of-the-art devices are used on airplanes. In addition, state-of-the-art devices can cause malfunctions due to the influence of minute electromagnetic waves. In particular, during communication, various communication equipments may receive incorrect information from the control tower due to interference from electromagnetic waves. In the case of a mobile communication terminal, more than two generations of communication methods are used, which basically means a transition from an analog radio to a digital radio.

In the case of digital wireless communication through a mobile communication terminal, the mobile communication terminal transmits a signal through an antenna through channel coding and digital modulation, and when received, converts the received signal into voice or video through digital demodulation and demultiplexing. do.

Therefore, the mobile communication terminal uses a predetermined frequency band when transmitting and receiving a signal, and when such a mobile communication terminal is used in an airplane, it causes a malfunction of various equipments provided in the airplane. In order to suppress the generation of unwanted electromagnetic waves generated in an airplane, the guide broadcast is used to guide passengers to turn off the power of the mobile communication terminals of passengers.

However, it is not possible to individually check whether the power is turned off for each passenger, and sometimes a mobile communication terminal is used during an actual flight.

Accordingly, an object of the present invention is to provide a mobile communication terminal capable of receiving a GPS signal from a satellite and automatically turning off the power according to the altitude of the plane.

The present invention for achieving the above object of the present invention is a position for receiving the GPS signal transmitted from the satellite, received from the GPS signal repeater provided in the plane, and extracting the location information of the plane from the received GPS signal An input unit; Conditional unit for setting a reference value for the altitude value of the airplane; An operation unit for receiving the position information of the plane from the position input unit and a reference value from the conditional unit, and outputting a power control signal according to the altitude of the plane included in the position information; And a power supply unit configured to receive a power control signal output from the operation unit and cut off a supply power according to the power control signal.

According to the present invention, the altitude of the plane is confirmed in real time, and the power of the mobile communication terminal used by the passenger is automatically cut off according to the altitude of the plane.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. Hereinafter, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

Example

1 is a diagram illustrating a network system for calculating an altitude at which a mobile communication terminal is located by using a GPS signal according to a preferred embodiment of the present invention.

Referring to FIG. 1, a network system using a GPS signal has at least four satellites 100a, 100b, 100c and 100d and a GPS signal repeater provided in the plane 120.

GPS network system is a global positioning system using satellites (100a, 100b, 100c, 100d) and receives the radio waves from satellites (100a, 100b, 100c, 100d) that know the exact location and measures the time required to the observation point. It is a system to find the position of observation point.

The satellites 100a, 100b, 100c, and 100d that transmit GPS signals are arranged on six orbits inclined at an equatorial angle of 55 degrees, and each of four or five satellites is disposed about 20200 km from the surface of the earth. In addition, the revolving period of the satellites 100a, 100b, 100c, and 100d is set to 11 hours 58 minutes to revolve the earth twice a day. In addition, four or more satellites (100a, 100b, 100c, 100d) are always tracked anywhere on the earth, and each satellite (100a, 100b, 100c, 100d) is equipped with a cesium or rubidium atomic clock and satellites (100a). , 100b, 100c, and 100d) are coincident.

Position measurement using GPS uses triangulation. First, the distance between the satellites (100a, 100b, 100c, 100d) and the GPS signal repeater provided in the plane 120 is measured, and the position of the GPS signal repeater is determined using the measured distance. The distance from the satellites 100a, 100b, 100c, and 100d to the plane 120 measures the time difference between the time of occurrence and the reception of a code signal, which is a GPS signal generated by each of the satellites 100a, 100b, 100c, and 100d. Then calculate by multiplying the speed of light here.

Each satellite 100a, 100b, 100c, 100d transmits GPS signals simultaneously using two different frequencies. That is, a frequency signal of 1.57542 GHz, which is an L1 carrier, and a frequency signal of 1.2276 GHz, which is an L2 carrier, are used. Information transmitted through such a carrier includes a pseudo-random noise (PRN) code.

The PRN code is configured to be unique for each satellite 100a, 100b, 100c, and 100d. That is, the PRN codes used in the satellites 100a, 100b, 100c, and 100d are configured differently. Preferably, the PRN code is a Coarse Acquisition (C / A) code. The C / A code consists of 1023 chips and is transmitted at a rate of 1.023 Mbits per second. The order of the C / A codes is repeated every 1/1000 second. The C / A code is transmitted superimposed on the L1 carrier.

In addition, in order to determine the position of the plane 120 based on the positions of the satellites 100a, 100b, 100c, and 100d, it is necessary to determine the precise positions of the satellites 100a, 100b, 100c, and 100d in addition to the distance data. To this end, the GPS signal repeater provided in the airplane 120 uses orbital force (Ephemeris) transmitted from the satellites (100a, 100b, 100c, 100d).

The GPS signal repeater provided in the plane 120 observes four satellites 100a, 100b, 100c, and 100d to measure a distance and calculates a position based on the measured distance, which solves four unknowns. This requires four observations. The four unknowns needed to calculate the position are the spatial coordinates Ux, Uy, Uz and the clock error Cb.

In particular, errors that may occur during position measurement include range errors, geometric errors due to satellite positioning, and errors due to selective availability.

First, the distance error means an error of the measured distance between the satellites 100a, 100b, 100c, and 100d and the GPS signal repeater of the plane 120. This includes errors caused by satellite clock errors, satellite orbit errors, atmospheric propagation delays, and electromagnetic noise in the receiver.

In consideration of the above-described error, the process of determining the position of the plane 120 is performed in the following four steps.

First, the GPS signal repeater tracks the satellites 100a, 100b, 100c, and 100d in an optimal arrangement. That is, the satellites 100a, 100b, 100c, and 100d of the arrangement in which the geometric error according to the arrangement situation of the satellites 100a, 100b, 100c, and 100d are minimized are tracked.

The distance to the satellites 100a, 100b, 100c, 100d is then measured for the satellites 100a, 100b, 100c, 100d whose position is tracked.

Subsequently, correction processing is performed on correction values of errors due to the ionosphere or the atmosphere, orbits and navigation data of the satellites 100a, 100b, 100c, and 100d.

Finally, the position of the observation point is calculated based on the corrected data.

2 is a block diagram illustrating a mobile communication terminal for calculating an altitude using a GPS signal according to a preferred embodiment of the present invention.

Referring to FIG. 2, the GPS signal repeater 200 receiving the GPS signal from the satellite 100 amplifies it and transmits the same to the mobile communication terminal 300 in the plane. The mobile communication terminal 300 receives the amplified GPS signal and uses it as data for calculating the altitude of the airplane. Therefore, when the altitude of the plane calculated by the mobile communication terminal 300 exceeds the reference value, the mobile communication terminal 300 automatically turns off the power.

The mobile communication terminal 300 illustrated in FIG. 2 includes a location input unit 310, a conditional unit 320, an operation unit 330, and a power supply unit 340.

The location input unit 310 receives a GPS signal transmitted from the GPS signal repeater 200. Also, location information is extracted from the received GPS signal. The position input unit 310 may be provided with a radio frequency (RF) system to receive a GPS signal. That is, the position input unit 310 may be provided with a duplexer (Duplexer) for receiving the GPS signal received from the antenna, and separates transmission and reception in terms of frequency. In addition, the location input unit 310 extracts the location information of the plane using the received GPS signal. The extracted location information is input to the calculator 330. The location information includes the current altitude value of the plane.

In addition, the conditional unit 320 sets a reference value at which the mobile communication terminal 300 starts to be turned off, and transmits the set reference value to the operation unit 330. The setting of the reference value is performed by the user of the mobile communication terminal 330 using the keypad and the displayed screen or by updating the input reference value. In addition, the mobile communication terminal 300 may be preset and used.

The calculating unit 330 compares the position information received from the position input unit 310 with the reference value input from the condition unit 320 and controls the operation of the power supply unit 340. The location information received from the location input unit 310 includes information on the altitude of the current plane. The altitude value included in the location information is compared with the reference value, and when the altitude value exceeds the reference value, the calculation unit 330 outputs a power control signal to the power supply unit 340.

When the power supply unit 340 receives the power control signal from the operation unit 330, the power supply unit 340 cuts off the power supplied to the components of the mobile communication terminal 300. Therefore, the power supply of the mobile communication terminal 300 is cut off by the power control signal, and the mobile communication terminal 300 enters the off state.

3 is a user interface screen showing a menu displayed for inputting a reference value to a conditional unit according to a preferred embodiment of the present invention.

Referring to FIG. 3, a user may set an automatic power off function provided in a mobile communication terminal by selecting a menu, and input or update a necessary reference value.

When the user selects the auto power off menu, the auto power off screen is displayed on the interface screen 400. The automatic power off screen includes a function selector 420 and an altitude inputter 440.

The function selector 420 may select whether to select or cancel the auto power off function. On the left side of the function selection unit 420, an indication indicating setting or canceling of the auto power off function is displayed. Also, on the right side of the instruction, a selection window for checking whether the current auto power off function is set or not is displayed. Therefore, the user can select the auto power off function through key input or the like.

The altitude input unit 440 is provided to set a reference value used for the condition unit 320 shown in FIG. 2. On the left side of the altitude input unit 440, an indication indicating input and display of a reference altitude value is displayed. In addition, the reference value for the currently set altitude is displayed on the right side of the indication. The reference value input window allows the user to check the reference value and to input or update a new reference value.

Accordingly, the input reference value is transmitted to the conditional unit, and the mobile communication terminal is controlled in the power supply state according to the GPS signal received from the GPS signal repeater provided in the plane.

According to the present invention as described above, if the altitude of the plane in real time, and the altitude value exceeds the reference value, the power of the mobile communication terminal can be automatically turned off. Therefore, phenomena such as signal interference of communication equipment and the like caused by the use of the mobile communication terminal during flight can be prevented, and malfunctions of various equipments provided in the plane can be prevented.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. I will be able.

Claims (1)

A position input unit for transmitting a GPS signal received from a satellite, received from a GPS signal repeater provided in an airplane, and extracting location information of the airplane from the received GPS signal; Conditional unit for setting a reference value for the altitude value of the airplane; An operation unit for receiving the position information of the plane from the position input unit and a reference value from the conditional unit, and outputting a power control signal according to the altitude of the plane included in the position information; A power supply unit which receives a power control signal output from the operation unit and cuts off power supply according to the power control signal; A function selection unit configured to select or release an automatic power-off function for shutting off the supply power according to the altitude of the plane; And A mobile communication terminal comprising an altitude input unit for receiving the reference value from a user.

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