摘要:
The present invention is providing an emergency illumination system based on combined LED lamps, comprising: combined LED lamps, a power driver of the lamps, an electromagnetic sensors, an emergency controller, a storage battery and an emergency charger; said external power supply, electromagnetic sensors, power driver of the lamps and conventional illumination LED lamps are in turn connected to form a conventional illumination load circuit; said external power supply, electromagnetic sensors, emergency charger, storage battery are in turn connected to form an emergency illumination charging circuit; magnetic catheter in said electromagnetic sensors serving as a start switch connects with said emergency controller; said emergency controller connects to the storage battery and emergency illumination LED lamps respectively thereby forming an emergency illumination load circuit; It is an uninterrupted illumination system, which comprise a dual-use lamp consisting of conventional illumination, and emergency illumination.
摘要:
The present invention provides GPS receivers with clock calibration for fast reacquisition of GPS signals after waking up from a sleep state or coming out of signal blockage. In a preferred embodiment, a GPS receiver comprises a local clock based on an oscillator, e.g., crystal oscillator. The GPS receiver calculates a clock calibration value based on a computed oscillator count for the period during which the GPS receiver is in the sleep state or the signal is blocked. This clock calibration value is used to calibrate the local clock after the GPS receiver wakes up or comes out of signal blockage for fast reacquisition of GPS signals.
摘要:
The present invention is providing an emergency illumination system based on combined LED lamps, comprising: combined LED lamps, a power driver of the lamps, an electromagnetic sensors, an emergency controller, a storage battery and an emergency charger; said external power supply, electromagnetic sensors, power driver of the lamps and conventional illumination LED lamps are in turn connected to form a conventional illumination load circuit; said external power supply, electromagnetic sensors, emergency charger, storage battery are in turn connected to form an emergency illumination charging circuit; magnetic catheter in said electromagnetic sensors serving as a start switch connects with said emergency controller; said emergency controller connects to the storage battery and emergency illumination LED lamps respectively thereby forming an emergency illumination load circuit; It is an uninterrupted illumination system, which comprise a dual-use lamp consisting of conventional illumination, and emergency illumination.
摘要:
The present invention provides GPS receivers with clock calibration for fast reacquisition of GPS signals after waking up from a sleep state or coming out of signal blockage. In a preferred embodiment, a GPS receiver comprises a local clock based on an oscillator, e.g., crystal oscillator. The GPS receiver calculates a clock calibration value based on a computed oscillator count for the period during which the GPS receiver is in the sleep state or the signal is blocked. This clock calibration value is used to calibrate the local clock after the GPS receiver wakes up or comes out of signal blockage for fast reacquisition of GPS signals.
摘要:
The present invention provides methods and systems that enable a mobile navigation receiver to accurately determine its trajectory with non-current ephemeris in stand-alone mode. In an embodiment, the receiver computes the position for the same location using non-current ephemeris and current ephemeris at different time instances. The receiver then determines a position correction by finding the difference between these two computed positions, and applies this correction to the trajectory generated with non-current ephemeris to obtain a more accurate trajectory. In another embodiment, the receiver computes an initial position of the receiver using non-current ephemeris and finds the difference between the computed initial position and an accurate approximation of the initial position. The receiver then shifts the subsequent receiver trajectory computed using non-current ephemeris by the difference to obtain a more accurate trajectory.
摘要:
The present invention provides methods and systems that enable a mobile navigation receiver to accurately determine its trajectory with non-current ephemeris in stand-alone mode. In an embodiment, the receiver computes the position for the same location using non-current ephemeris and current ephemeris at different time instances. The receiver then determines a position correction by finding the difference between these two computed positions, and applies this correction to the trajectory generated with non-current ephemeris to obtain a more accurate trajectory. In another embodiment, the receiver computes an initial position of the receiver using non-current ephemeris and finds the difference between the computed initial position and an accurate approximation of the initial position. The receiver then shifts the subsequent receiver trajectory computed using non-current ephemeris by the difference to obtain a more accurate trajectory.