Abstract: A clock error prediction method includes: obtaining historical satellite clock error data of a preset time period which includes broadcast ephemeris clock error data and precise ephemeris clock error data; obtaining corrected precise ephemeris clock error data based on the broadcast ephemeris clock error data; obtaining a single-day clock speed of each satellite through fitting based on single-day clock error data in the corrected precise ephemeris clock error data of each satellite; obtaining a clock speed time sequence of each satellite based on the single-day clock speed of each satellite; obtaining a clock speed change rate of each satellite through fitting based on the clock speed time sequence of each satellite; and obtaining a predicted clock error of each satellite in a preset future time period based on an initial clock error value, a clock speed, and the clock speed change rate of each satellite.

Abstract: Positioning method and apparatus provide two services: a first, common positioning service and a second, high-precision positioning service to an upper-layer application through permission control and an independent reporting channel design. For a common application, a positioning result can be reported with a first, common precision through a common reporting channel. For a high-precision application, a positioning result with a higher level of precision can be reported through a high-precision reporting channel. In this way, the channel for obtaining the positioning result by the common application is isolated from the channel for obtaining the positioning result by the high-precision application, thus improving output security of the high-precision positioning result and satisfying security requirements of different countries or regions.

Abstract: A low-power-consumption positioning method includes an electronic device sending first setting information to a server, where the first setting information is used to indicate the server to broadcast positioning assistance data to the electronic device at a first time interval (for example, 1 second). The electronic device resolves high-precision positioning information based on the positioning assistance data. When the electronic device meets a first preset condition, the electronic device may send second setting information to the server. The second setting information instructs the server to broadcast the positioning assistance data to the electronic device at a second time interval (for example, 60 seconds). The first time interval is shorter than the second time interval.

Abstract: An air current generator includes an outer casing, a power unit, an air temperature control device, and an ionizing airflow generator. The air temperature control device is electrically connected to the power unit for generating a temperature-controlled air within the air ventilating cavity of the outer casing. The ionizing airflow generator includes an ionizing airflow unit which includes a first electrode set as an electrode terminal disposed within the outer casing at a position close to an air inlet, and a second electrode set disposed within the outer casing at an air outlet, wherein a voltage of the second electrode set is higher than a voltage of the first electrode set to generate an electrostatic force for drawing a flow of air from the air inlet to the air outlet so as to guide the temperature-controlled air within the outer casing to the exterior of the outer casing through the air outlet.

Abstract: An air purifier for removing particles in air includes an outer casing, and an ionizer module. The ionizer module includes a power unit and an ionizing electrode unit, electrically connected to the power unit. The ionizing electrode unit includes a first electrode set as an electrode terminal disposed within the outer casing at an air inlet, a second electrode set disposed within the outer casing at an air outlet, and a third electrode set disposed within the outer casing at a position between the first and second electrode set, wherein a voltage of the third electrode set is higher than a voltage of the first electrode set for drawing the air from the first electrode set to the second electrode set via the second electrode set while dirt particles contained in the air is trapped on the second and the third electrode sets.