Abstract:
A method for generating a pulse width modulation (PWM) signal, by a processor communicatively coupled to a system memory element, is provided. The method computes, by the processor, a coarse adjustment PWM output signal and a modified fine adjustment input signal, using a low speed clock rate; performs, by the processor, a fine adjustment to the coarse adjustment PWM output signal, using a high speed clock rate, based on the modified fine adjustment input signal; and generates an increased resolution PWM output signal, by the processor, based on the fine adjustment.
Abstract:
Systems and methods are described for synchronizing data in a mobile platform. In one embodiment, a method for synchronizing data in a mobile platform is provided. The method includes: receiving a first synchronization signal at a first remote interface unit from a signal generator; receiving a second synchronization signal at a second remote interface unit from the signal generator; and executing a synchronization state machine of the first and second remote interface units based on the first and second synchronization signals to synchronize outputs of the first and second remote interface units.
Abstract:
A method for using an access triggered architecture for a computer implemented application is provided. The method receives a set of data at a designated functional block associated with a system memory location; performs an operation at the designated functional block, using the set of data, to generate a result, wherein the operation is performed each time information is received at the designated functional block; and returns the generated result to the system memory location.
Abstract:
Systems and methods are described for synchronizing data in a mobile platform. In one embodiment, a method for synchronizing data in a mobile platform is provided. The method includes: receiving a first synchronization signal at a first remote interface unit from a signal generator; receiving a second synchronization signal at a second remote interface unit from the signal generator; and executing a synchronization state machine of the first and second remote interface units based on the first and second synchronization signals to synchronize outputs of the first and second remote interface units.
Abstract:
A method for performing high-integrity data transmission is provided. The method obtains a first set of data at a first transmitter and a second set of data at a second transmitter; develops a first key for the obtained first set of data and a second key for the obtained second set of data; and when the first key matches the second key, provides a receiver indication of validity of the first set of data. In certain embodiments, the method stores the first key and the second key within a predetermined window of time. In some embodiments, when the first key matches the second key, the method also synchronizes operation of the first transmitter and the second transmitter.
Abstract:
A printed circuit board assembly (PCBA) may include a printed circuit board (PCB), a socket mechanically and electrically coupled to the PCB, and an integrated circuit package electrically coupled to the socket. The PCBA also may include a thermal cover comprising a thermally conductive material and a thermal strap thermally coupled to the thermal cover. The thermal cover may be thermally coupled to the integrated circuit package and mechanically urge the integrated circuit package in contact with the socket, and the thermal strap may include a thermally conductive material.
Abstract:
A rotor assembly for deployment within a momentum control device that enables near-zero revolutions per minute (RPM) sensing, and method for making same, are provided. The provided rotor assembly utilizes a magnet coupled to the rotor shaft and a stationary sensor element to detect magnetic flux from the magnet and derive reliable near zero RPM therefrom.
Abstract:
Methods and apparatus are provided for a controlled motor assembly for use in a reaction wheel assembly (RWA). The controlled motor assembly is optimized to work with an AC motor, and includes a filter configured to inhibit electrical and electromagnetic noise from being coupled between a spacecraft power bus and a power bus internal to the RWA, as well as an arrangement of power switch elements providing a path for motor phase currents associated with the AC motor. A digital control system is implemented to receive a command input, position sensor feedback and to retrieve parameters associated with the AC motor from a memory device. Based on the command input, the position sensor feedback and the parameters associated with the AC motor, the digital control system controls activation for the arrangement of power switch elements, and generates data output.
Abstract:
A method for calibrating a motor, the motor comprising a permanent magnet synchronous motor, is provided. The method generates a rotating magnetic field using a voltage vector, the rotating magnetic field configured to rotate at a constant angular velocity independent of an actual rotor position, and the rotating magnetic field rotating in a first direction; identifies, by a processor, timing data associated with a plurality of digital Hall effect sensors; computes, by the processor, accurate positions for each of the plurality of digital Hall effect sensors, using the timing data and the constant angular velocity; creates a reference table in system memory, by the processor, the reference table comprising the accurate positions; and during operation of the motor, calculates accurate angular velocity values for the motor, using the reference table.
Abstract:
A printed circuit board assembly (PCBA) may include a printed circuit board (PCB), a socket mechanically and electrically coupled to the PCB, and an integrated circuit package electrically coupled to the socket. The PCBA also may include a thermal cover comprising a thermally conductive material and a thermal strap thermally coupled to the thermal cover. The thermal cover may be thermally coupled to the integrated circuit package and mechanically urge the integrated circuit package in contact with the socket, and the thermal strap may include a thermally conductive material.