2results about How to "Frequency synchronization" patented technology

This invention provides a ubiquitous network frequency offset estimation method, system, medium, and terminal. The method includes the following steps: receiving wireless signals from multiple carriers of multiple satellites; constructing the satellite-to-ground geometric relationship between each satellite and the terminal; constructing a frequency offset estimation equation based on the wireless signals and the satellite-to-ground geometric relationship; and obtaining a frequency offset estimate based on the frequency offset estimation equation. The ubiquitous network frequency offset estimation method, system, medium, and terminal of this invention can achieve accurate frequency offset estimation even in the absence of GNSS signals in the ubiquitous network, thereby ensuring the continuity and reliability of the ubiquitous network.

The utility model discloses a high frequency induction heating power supply for pipeline anticorrosive layer peeling, including three -phase rectifier bridge, first power module, second power module, first controller and second controller, and first power module and second power module are connected in parallel on the output of three -phase rectifier bridge, and the output of first power module is connected with first induction heating coil, and the output of second power module is connected with second induction heating coil, two controllers pass through respective driver control respective power module output high frequency alternating -current, first controller and second controller communication connection, the utility model discloses to adopt the upper passageway structure, and each group power module can connect induction heating coil and work simultaneously, has improved pipeline anticorrosive layer peeling efficiency, and two groups of power module can control output frequency through respective controller, and simultaneously, through the connection of two controllers, also can form master -slave control, makes the frequency synchronization of two power module output.