Abstract:
PURPOSE: An apparatus and a method for measuring the antenna gain of the earth station using the sun are provided to measure the antenna gain of the satellite navigation ground station without using the standard antenna or the satellite mount relay. CONSTITUTION: A gain-to-noise temperature ratio calculator(180) uses the reception noise power measurement result value at the state where the antenna tracing the sun to produce the antenna G/T ratio. The noises temperature measuring unit(140) measures the noise temperature in the signal transceiving through antenna. The antenna gain calculator(170) uses the G/T ratio and noise temperature value to produce the antenna gain. A loss measurement unit(130) measures the signal loss value created in the RF(Radio Frequency) cable for the power feed of antenna. The antenna gain calculator reflects the signal loss value to produce the antenna gain.
Abstract:
1. 청구범위에 기재된 발명이 속한 기술분야 본 발명은 GPS 신호 중계 장치 및 정지궤도 위성의 GPS 수신 장치와, 그를 이용한 정지궤도 위성의 위치 결정 방법에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은 GPS 신호를 정지궤도 위성까지 전송할 수 있는 간단한 GPS 신호 중계장치를 지상에 4개 이상 설치하고, 정지궤도 위성에서 GPS 신호가 수신가능하도록 하여 GPS를 정지궤도 위성의 위치결정에 이용하도록 하기 위한, GPS 신호 중계 장치 및 정지궤도 위성의 GPS 수신 장치와, 그를 이용한 정지궤도 위성의 위치 결정 방법을 제공하는데 그 목적이 있음. 3. 발명의 해결방법의 요지 본 발명은, 상기 정지궤도 위성의 GPS 수신 장치에서 상기 GPS 신호 중계 장치로부터 GPS 신호를 수신받아, 상기 정지궤도 위성의 위치를 결정하는 방법에 있어서, GPS 위성으로부터 수신되는 L-밴드(band) GPS 신호를 상향링크 주파수 대역으로 각각 변환한 후, 각 할당된 주파수 대역을 사용하여 상기 정지궤도 위성으로 전송하는 GPS 신호 전송단계; 및 상기 정지궤도 위성으로 수신되는 상기 상향링크 주파수대역의 GPS 신호를 L-band GPS 신호로 생성하고, 상기 생성된 L-band GPS 신호에서 GPS 위성들을 하나만 선택하고 복수의 GPS 위성정보 및 이들의 전파이동시간을 이용하여 상기 정지궤도 위성의 위치를 계산하는 위치 계산단계를 포함한다. 4. 발명의 중요한 용도 본 발명은 GPS를 이용한 정지궤도 위성의 위치 결정 시스템 등에 이용됨. GPS, 정지궤도 위성, 위치 계산, GPS 중계기, GPS 위성, 주파수 대역
Abstract:
A TTC(Tracking,Telemetry and Command) duplexing device for stable satellite control performance is provided to realize a duplexing function by using an IF(Intermediate Frequency) equipment between a signal conversion processing equipment and an RF(Radio Frequency) processing equipment, thereby stably receiving telemetering data from a satellite as sending telecommanding data to the satellite. A data transmitter/receiver(110) receives telemetering data from an external satellite(300), and sends telecommanding data to the satellite(300). An RF processor(120) up-converts IF signals received from duplexed signal conversion processors(130,131) into RF signals to deliver the RF signals to the transmitter/receiver(110), and down-converts RF signals received from the transmitter/receiver(110) into IF signals to deliver the IF signals to the signal conversion processors(130,131). The duplexed signal conversion processors(130,131) convert baseband signals received from duplexed external satellite control centers(200,201) into IF signals to deliver the IF signals to the processor(120), and convert the IF signals received from the processor(120) into baseband signals to deliver the baseband signals to the control centers(200,201). An IF switching unit(150) sets links for transceiving the telemetering and telecommanding data between the processor(120) and the processors(130,131). A control and monitor unit(140) controls and monitors a state of the switching unit(150).
Abstract:
A broadband GPS jamming detection system and a method thereof are disclosed. The broadband GPS jamming detection system according to an embodiment of the present invention comprises: a local oscillator maintaining unit which maintains multiple local oscillators; a frequency band selection unit which selects a frequency band to detect, as a radio frequency (RF) signal is received; an oscillating signal output unit which allows the output of an oscillating signal output from a local oscillator which is distinguished by the selected frequency band among multiple local oscillators; and an intermediate frequency signal producing unit which produces an intermediate frequency signal using the RF signal and the oscillating signal. [Reference numerals] (110) GPS broadband antenna; (120) Frequency band selection unit; (130) Local oscillator maintaining unit; (140) Oscillating signal output unit; (150) Intermediate frequency signal producing unit
Abstract:
PURPOSE: A device and a method to check a hybrid direction are provided to precisely find the direction using a phase difference method with only two antennae while the ambiguity is removed by using an amplitude or signal intensity method. CONSTITUTION: A device to check a hybrid direction comprises a rotation unit (130) having the LP antenna of the m (the m is the natural number) and dipole array antennae of the n (the n is the natural number more than 2); and a signal processing unit (180) grasping a direction by finding a point where an azimuth between the dipole array antennae is zero while rotating to the rotation unit in a direction in which a signal strength of the LP antenna is relatively greater. [Reference numerals] (110) Dipole array antenna (with LNA); (120) LP antenna (with LNA); (130) Rotation unit; (131) Rotation shaft; (140) Antenna rotation control unit; (150) Phase compensating; (160) Display unit; (170) RF/IF convertor; (180) Signal processing unit; (190) Central processing and controlling unit; (AA) Electric wave
Abstract:
PURPOSE: An apparatus for searching a distress signal and a controlling method thereof are provided to transmit a distress signal or distress information to a searching and rescuing team in real time. CONSTITUTION: A beacon receiving unit(210) receives a distress signal from a distress beacon device. A decoding unit(220) decodes the distress signal and grasps the distress information. A display unit(240) displays the grasped distress information.
Abstract:
PURPOSE: A satellite tracking and data communications method of an uplink station and an apparatus thereof for tracing the satellite of the maximum number of the uplink station are provided to efficiently trace a plurality of satellites by using visible time information. CONSTITUTION: A tracking data generator(141) generates the tracking data of the visible satellite among a plurality of satellites. A tracking priority determiner(143) decides the trace priority based on the signal transmission time limit calculated from visible satellite tracking data. An optimum tracking priority determiner(145) decides the optimum priority.
Abstract:
A system and a method for steadily controlling a satellite through automatic switch are provided to perform satellite control consecutively even if failure occurs in a TTC system. A satellite(100) collects data while orbiting around earth. Collected data are transmitted. A main part control system(200) receives a result for a corresponding task. A remote command is transmitted to the satellite. The main part control system comprises a main part TTC(Tracking, Telemetry and Command) system(210) and a main part satellite operating system(230). The main part satellite operating system receives the telemetry from the main part TTC system.
Abstract:
A device and a method for tracking a satellite of a mobile satellite ground controlling system are provided to transmit a remote command signal from ground to the satellite and a remote measurement signal from the satellite exactly by obtaining an angle of direction and an angle of elevation accurately using the tracking device. A device for tracking a satellite of a mobile satellite ground controlling system includes a GPS receiver(10), a horizontal device(20), an antenna part(30), and a mobile device(50). The GPS receiver receives position coordinate signal about the tracking device. The horizontal device obtains a tilt angle of the tracking device. The antenna part adjusts a true north direction of an antenna(32) according to the position coordinate signal and transfers the tilt angle signal. The mobile device sets current position information by aligning a position coordinate transferred from the GPS receiver and the antenna part.