2results about How to "Reduce time to first fix" patented technology

A method and apparatus for acquisition preprocessing includes: estimating and determining the visible satellites of the navigation receiver within a preset time period based on satellite visibility association information of the navigation receiver; and performing acquisition processing based on the estimated visible satellites of the navigation receiver within the preset time period. Embodiments of the present invention reduce the number of satellites searched during cold start, shorten the initial positioning time during cold start, and improve the acquisition efficiency of the navigation receiver.

The invention relates to a large marine organism rapid positioning system, method and device based on an ultra-long period prediction ephemeris, and belongs to the technical field of satellite navigation positioning, marine animal telemetering and low-power-consumption embedded electronics and the technical field of underwater acoustic detection and image intelligent recognition. The system comprises a GNSS receiving module, an ephemeris acquisition and prediction ephemeris generation module, an animal behavior detection module, a signal quality evaluation module, an ephemeris life cycle management module, a rapid positioning module, a communication module, a control and storage module and a power management module. The invention also provides an operation method of the system and a device carrying the system. The system provided by the invention can still have enough precision for supporting and quick positioning under a long-time off-line condition.