A test device determines a Global Navigation Satellite System (GNSS) signal propagation delay in a GNSS signal distribution system (GSDS) for a radio access network, and can further perform long-term tests on a GSDS without having access to a GNSS satellite. The test device includes a GNSS receiver and a clock that can be re-tuned to accommodate performing tests on the GSDS.

A test device determines a Global Navigation Satellite System (GNSS) signal propagation delay in a GNSS signal distribution system (GSDS) for a radio access network, and can further perform long-term tests on a GSDS without having access to a GNSS satellite. The test device includes a GNSS receiver and a clock that can be re-tuned to accommodate performing tests on the GSDS.

A communication method and a communications apparatus are provided. The communication method includes: sending, by a terminal device, a first indication message, where the first indication message is used to indicate a first time type and/or a first time precision, or the first indication message is used to indicate an access network device to send time information to the terminal device; receiving, by the terminal device, the time information; and synchronizing, by the terminal device, a time of the terminal device based on the time information. Correspondingly, a communications apparatus is further provided. According to the embodiments of this application, the terminal device can obtain, based on requirements of different application scenarios, a time type and/or time precision preferred by the terminal device.

An electronic timepiece includes a communication unit receiving identification information for identifying a radio station from the radio station, a storage unit storing a database having, as a record, the identification information and time difference information indicating a time difference associated with the identification information, a timekeeping unit in which a set time difference being a time difference with respect to a reference time is set, a first time difference correction unit correcting the set time difference to the time difference information associated with the identification information received by the communication unit, an operation unit accepting user operation, a second time difference correction unit correcting the set time difference according to the operation, and an update processing unit updating the database by changing the time difference information to the set time difference corrected by the second time difference correction unit.

A method including powering on a controller and an unmanned aerial vehicle (UAV). Setting a clock time on the controller to an initial time. Connecting the UAV to a global positioning satellite (GPS). Linking the controller and the UAV and comparing the initial time to a time from the GPS. Setting the clock time of the controller and the UAV so that the controller and the UAV have a same time.

A method including powering on a controller and an unmanned aerial vehicle (UAV). Setting a clock time on the controller to an initial time. Connecting the UAV to a global positioning satellite (GPS). Linking the controller and the UAV and comparing the initial time to a time from the GPS. Setting the clock time of the controller and the UAV so that the controller and the UAV have a same time.

A portable electronic apparatus includes a case, a solar cell disposed in the case, a GPS antenna as an antenna section disposed in the case, including a base as a nonconductive member and a conductive body disposed on a surface of the nonconductive member, and adapted to receive a positioning satellite signal, and a circuit board disposed in the case, and electrically connected to the solar cell and the antenna section, and the antenna section overlaps the solar cell in a planar view viewed from a normal direction of light receiving surfaces of the solar cell.

A portable electronic apparatus includes a case, a solar cell disposed in the case, a GPS antenna as an antenna section disposed in the case, including a base as a nonconductive member and a conductive body disposed on a surface of the nonconductive member, and adapted to receive a positioning satellite signal, and a circuit board disposed in the case, and electrically connected to the solar cell and the antenna section, and the antenna section overlaps the solar cell in a planar view viewed from a normal direction of light receiving surfaces of the solar cell.

An electronic timepiece includes a radio wave receiver which receives radio waves from a positioning satellite, a communicator which performs communication with an external device, a storage which stores predicted positional information of the positioning satellite acquired from a source other than the positioning satellite, and a processor configured to update the predicted positional information stored in the storage by causing the communicator to acquire the predicted positional information from the external device at or after a specified timing corresponding to an update period of the predicted positional information, the specified timing being a timing before an end of an effective period of the stored predicted positional information, and the update period being determined in advance in the external device.

An electronic timepiece includes a radio wave receiver which receives radio waves from a positioning satellite, a communicator which performs communication with an external device, a storage which stores predicted positional information of the positioning satellite acquired from a source other than the positioning satellite, and a processor configured to update the predicted positional information stored in the storage by causing the communicator to acquire the predicted positional information from the external device at or after a specified timing corresponding to an update period of the predicted positional information, the specified timing being a timing before an end of an effective period of the stored predicted positional information, and the update period being determined in advance in the external device.