Abstract: A rheostat includes a connection port, a variable resistor, a controller and a display. The connection port is electrically connected to a computer and configured for receiving a control signal of the computer. The variable resistor is electrically connected to a circuit board. The controller is electrically connected to the connection port and the variable resistor and is configured for changing a resistance value of the variable resistor according to the control signal. The display is electrically connected to the controller and displaying the resistance value.

Abstract: A dual VGA connectors testing system includes an exchanging module and a controlling module connected to the exchanging module. The exchanging module includes a number inputting terminals and a number of outputting terminals.

Abstract: An SVID data test system is applied on a test device and a display device, and the test device is electrically connected to a tested device via an SVID interface, and the display device via a serial interface. The system receives SVID signals, analyzes the SVID signals to obtain nine bit real signals, and performs parallel encoding on the nine bit real signals to obtain nine bit parallel signals. The system further converts the nine bit parallel signals to nine bit serial signals, transmits the serial signals in sequence to the display device, and parses the nine bit serial signals to obtain a packet in hexadecimal and controls the display device to display the packet in response to the display command.

Abstract: A data read and write device for a USB port of a 1-Wire device includes a USB interface and a 1-wire host. The USB interface includes a USB buffer and a USB connector, and converts a USB command sent by a host computer to a 1-Wire command. The USB buffer is installed in a microcontroller, and the USB connector is connected to the host computer. The 1-Wire host includes a group of DIO pins and a connector connected to the microcontroller. The 1-wire host controls one of the DIO pins to transfer the 1-Wire command to a 1-Wire slave, receives feedback data of the 1-Wire slave, and temporarily storing the feedback data into the USB buffer. The microcontroller sends the feedback data to the host computer.

Abstract: A calculating method for deducing all possible scenarios of satellite members and possibilities thereof in a low earth orbiting (LEO) satellite constellation is described, which is achieved mainly by relying on the spherical geometry analysis and probabilities and statistics technologies, in an attempt to rapidly and precisely obtain the concerned scenarios and possibilities thereof observed on the earth ground. With any user-defined orbital parameters and a position of an observation station for the scenarios on the earth ground inputted, all the possible scenarios and possibilities thereof can be obtained with the calculating method.

Abstract: An algorithm for deducing all possible scenarios of satellite members and possibilities thereof in a low earth orbiting (LEO) satellite constellation is described, which is achieved mainly by relying on the spherical geometry analysis and probabilities and statistics technologies, in an attempt to rapidly and precisely obtain the concerned scenarios and possibilities thereof observed on the earth ground. With any user-defined orbital parameters and a position of an observation station for the scenarios on the earth ground inputted, all the possible scenarios and possibilities thereof can be obtained with the algorithm.