Abstract:
PURPOSE: A method for sensing an emergency situation and delivering an alarm and a system are provided to collect and store an accelerometer, global positioning system (GPS) information, pulse and body temperature information which is embedded in a smart phone by integrating a pulsimeter and a thermometer having an application and a blue-tooth function, thereby quickly coping with the emergency situation by transmitting related information to a protector and a relief center. CONSTITUTION: A method for sensing an emergency situation and delivering an alarm comprises a data collection storage step (S100), an emergency situation sensing step (S200), an emergency situation notification step (S300), and a warning tone transmission step (S400). The data collection storage step stores one or more information among pulse information of a user, body temperature information, GPS location information of a smart phone, activity information of a smart phone user. The emergency situation sensing step senses the emergency situation of a user by comparing with stored information with pre-stored reference information. The emergency situation notification step transmits the emergency situation of the user to a predetermined receiving station when the emergency situation of the smart phone user is sensed. The warning tone transmission step transmits warning tone to the smart phone of the user. [Reference numerals] (S100) Store the pulse, body temperature, location, and action information of a user; (S200) Detect an emergency situation; (S300) Warn the emergency situation; (S400) Output an alarming sound from a smart phone
Abstract:
본 발명은 위성용 우주분진물 분사장치에 관한 것으로서, 우주분진물을 수거하는 위성에 탑재된 분사장치에 있어서, 상기 분사장치는, 개구된 일단부로 우주분진물이 분사되는 본체와; 상기 본체에 삽입되어 내장되고 그 일단부는 수거된 우주분진물과 접하는 분사면으로 형성된 스프링과; 상기 본체에 설치되고 모터에 의해 회전 구동되는 스크류축과; 상기 스크류축에 의해 본체의 축방향을 따라 이동되면서 스프링을 압축 및 인장시키는 고정핀;을 포함하여 구성된 것을 특징으로 하여, 경제적이고 효율적이다. 위성, 우주, 분진물, 잔해, 분사, 대기권, 스프링, 분사면
Abstract:
A cosmic dust injection system for a satellite is provided to heighten profitability because the expendable fuel like propellant is not used. A cosmic dust injection system for a satellite comprises a main body(110) in which cosmic dust is emitted to one opened end, a spring(150) which is inserted into the main body, whereof one end is formed with the jetting surface contacting with the cosmic dust, a screw shaft(120) which is installed in the main body and rotates with the motor, and a fixation pin(130) which compresses and releases the spring.
Abstract:
A method and an apparatus for determining GEO stationary satellite attitude and orbit using multiple ground based GPS signal transceivers are provided to determine the attitude and the position of a GEO stationary satellite using the GPS signal transmitted from the multiple ground based GPS transceivers. According to an apparatus for determining GEO stationary satellite attitude and orbit, a number of ground base stations transmit a GPS signal by being installed on the ground. A number of antennas receive the GPS signal by being installed on a stationary satellite. A calculation part calculates the attitude and orbit of the GEO stationary satellite by analyzing the GPS signal received by the antennas.
Abstract:
An image correction system for a star sensor and a star sensor system capable of canceling jitter are provided to improve attitude determination of a spacecraft by compensating a distorted image to use the compensated image for attitude control of the spacecraft. An image correction system(20) for a star sensor comprises an optical system(2), a CCD imager(3), a plurality of accelerometers(21), a band-pass signal processing unit(22), and an image compensating and processing unit(23). The optical system condenses light of a star and enlarges/reduces an image of the star. The CCD imager is coaxially mounted with the optical system, and senses the star image that is enlarged or reduced by the optical system. The accelerometers are mounted on the CCD imager to measure acceleration of the jitter of the CCD imager in a direction of at least one azimuthal axis. The signal processor performs double integration on the acceleration information measured by the accelerometers to calculate displacement of the CCD imager in a direction of each azimuthal axis, and calculates amplitude of the displacement in a direction of each azimuthal axis by deducting the minimum from the maximum of the displacement. The image compensating and processing unit corrects the image of the star by extracting coordinates of the star image on an image plane of the CCD imager, deducting the amplitude from the extracted coordinates, and arranging the star image on the deducted coordinates so as to correct the star image.
Abstract:
PURPOSE: An enhanced ground based precise posture determination method of a low-orbit imaging satellite is provided to accurately determine the posture of the satellite by dually using gyro measurement data and star tracker measurement data. CONSTITUTION: Gyro measurement data and star tracker measurement data are obtained in different intervals through a gyro sensor and a star tracker using a dual MIL-STD-1553 bus communication device (S100). The gyro measurement data and the star tracker measurement data are stored and transmitted to a ground station (S200). A posture quaternion estimated value is repeatedly predicted until the star tracker measurement data is received after calculating an angular speed by restoring the transmitted gyro measurement data again (S300). A modified value is calculated by using the posture quaternion estimated value and the star tracker measurement data, and an error posture quaternion is applied as a corrected value by using the modified value (S400). [Reference numerals] (S100) Measured data obtaining step; (S200) Measured data transmitting step; (S300) Angular speed calculating and predicting step; (S400) Correcting step
Abstract:
A method for finding centroid of an adaptive star in a star sensor is provided to improve accuracy and speed in star pattern recognition and pose decision by previously removing unusual stars in a cluster forming process. A method for finding centroid of an adaptive star in a star sensor includes the steps of: compensating dark current in a star image photographed by a CCD(Charge-Coupled Device) in a star sensor; measuring average brightness of a background image corresponding to an outer space from a selected scan window to separate the star image displayed on the CCD from the background image corresponding to the outer space; selecting the minimum effective brightness level from the average brightness of the background image of the outer space; detecting valid pixels above the minimum effective brightness level; forming a cluster with valid pixels above the minimum effective brightness level; removing stars with unusual shape in the cluster; and calculating centroid of the clustered star with a centroid method.