摘要:
Provided is a Global Positioning System (GPS) signal repeater and a GPS receiver of a stationary orbit satellite, and a method for positioning a stationary orbit satellite using the same. The GPS signal repeater includes: a GPS receiver for receiving an L-band GPS signal transmitted from a GPS satellite; a low-noise amplifier for removing noise of the received L-band GPS signal and maximally amplifying a desired signal; a frequency transformer for transforming the amplified L-band GPS signal into an up-link frequency band; a high power amplifier for amplifying the transformed up-link frequency band GPS signal; and a transmitter for transmitting the amplified signal to a stationary orbit satellite.
摘要:
A satellite simulation model system based on an interface standard model is disclosed. The system includes a satellite subsystem standard model for simulating operations of physical satellite subsystems; a flight software module for generating a control signal changing operation state of the satellite subsystem standard model; an interface standard model for converting data transmitted from the satellite subsystem standard model and the flight software module into data to receiving components and transmitting the converted data to the receiving components; and a model managing unit for generating the satellite subsystem standard model and the interface standard model as independent component objects and controlling each component object to perform satellite simulation.
摘要:
Disclosed are a die-attaching paste composition and a method for hardening the same. The present invention provides the die-attaching paste composition applied at a thickness of 200 μm or less on a printed circuit board (PCB), including liquid or solid epoxy, acrylate, a flexing agent, an organic filler and a UV-initiator. The method for hardening a die-attaching paste of the present invention includes carrying out a B-staging process by irradiating a UV-ray to the die-attaching paste composition. According to the present invention, a processing time may be more shortened and storage of the die-attaching paste may be more significantly improved when a B-staging process using UV rays is applied than when a conventional thermal crosslinking method is used, and therefore a manufacturing cost in the conventional assembly industries may be decreased. Also, the B-staging process may be uniformly carried out and physical properties of the die-attaching paste may be adjusted to desired characteristics since the UV exposure to the die-attaching paste is easily controlled.
摘要:
Provided are an apparatus and a method for verifying a reception and execution status of telecommand in a satellite control system. The inventive apparatus for informing a satellite control system of a reception and execution status of telecommand in a satellite comprises a telecommand receiver for receiving a telecommand signal transmitted from a satellite control system, a link control unit for extracting a command transfer frame from the telecommand signal received in the telecommand receiver, judging whether or not the extracted command transfer frame is valid, and providing corresponding link verification telemetry information to a telemetry transmitter, a telemetry information database for storing a set of telecommand execution verification telemetry mnemonics or measured values, a telecommand/telemetry unit, when the telecommand is executed, for acquiring an execution verification telemetry mnemonic responding to the telecommand from the telemetry information database, and the telemetry transmitter for generating a telemetry transfer frame having the link verification telemetry information provided by the link control unit and the telecommand execution verification telemetry mnemonic acquired by the telecommand/telemetry unit as data field, and sending the generated telemetry transfer frame to the satellite control system.
摘要:
A dual printing mask is used for coating a die adhering paste of a predetermined pattern on a substrate uniformly during a semiconductor packaging process. This dual printing mask includes a metal mask layer having a predetermined pattern of openings so as to receive a paste for adhering a semiconductor die onto a substrate, and a mesh layer integrally attached on the metal mask layer.
摘要:
A liquid crystal display (LCD) includes a first insulating substrate, a second insulating substrate arranged opposite to the first insulating substrate, a liquid crystal layer arranged between the first insulating substrate and the second insulating substrate, a spacer which defines and maintains a substantially uniform gap between the first insulating substrate and the second insulating substrate, and a high molecular weight layer which is provided on a surface of the second insulating substrate and attaches the spacer to the second insulating substrate.
摘要:
Disclosed is a command planning apparatus of a low-earth orbit satellite, and a low-earth orbit satellite control system including the same. The present invention automates the process of executing the command plan for converting the satellite task schedule planned on the ground into telecommands available by the satellite in the low-earth orbit satellite control system, and automatically selects a data set established by the parameters related to the execution task of the satellite according to the mapping rule.
摘要:
Disclosed is a liquid crystal display comprising a first substrate made of an insulating material; pixel electrodes formed on the first substrate, the pixel electrodes having a first aperture pattern; a second substrate made of an insulating material and provided opposing the first substrate at a predetermined distance; a common electrode formed on the second substrate, the common electrode having a second aperture pattern; and a liquid crystal layer made of liquid crystal material that is injected between the first and second substrates, wherein either or both of the pixel electrodes and the common electrode include stepped portions that protrude a predetermined distance away from the substrates, between apertures of the first and/or second aperture patterns.
摘要:
An internal voltage generator for memory bank peripheral circuitry, a semiconductor memory device having the internal voltage generator, and a method for generating an internal voltage are provided. A switchable internal voltage generating circuit according to the present invention includes a control section and an internal voltage generating circuit. The control section generates a control signal in response to a bank activation command and a bank activation signal for enabling memory banks. The internal voltage generating circuit receives a reference voltage, and responds to the control signal to output an internal voltage equal to the reference voltage. The control signal is enabled when the bank activation command and the bank activation signal are concurrently enabled. The bank activation signal is generated in response to a bank address. The internal voltage can be supplied only to peripheral circuits of the banks selected by the bank address, thereby preventing unnecessary power consumption, effectively controlling the internal voltage, and always properly supplying the internal voltage.
摘要:
A dynamic random access memory device includes a mode register set, a refresh period selector, and a bit organization selector. The mode register set outputs decoded signals having values according to a user-stored value in the mode register set. The mode register set can be accessed in response to an address externally supplied when a mode set command is applied. The refresh period selector generates a plurality of refresh period select signals in response to the decoded signals. A refresh counter in the device generates a sequence of row addresses having a timing according to a refresh period determined from an activated refresh period select signal. The bit organization select circuit generates a plurality of bit organization select signals in response to the decoded signals from the mode register set. A data output multiplexer in the device selects some of the read data bits according to a bit organization determined by one of the bit organization select signals.