To perform positioning by a computing device, a position request transmitted by a terminal is received. The positioning request includes target access point information obtained by the terminal. Then a plurality of first geographic grids related to a location of the terminal is determined based on the target access point information. A positioning sequence of the plurality of first geographic grids is determined according to access point information corresponding to the plurality of first geographic grids and the target access point information. The positioning sequence indicates distances between the plurality of first geographic grids and the terminal. The location of the terminal is then determined based on the positioning sequence of the plurality of first geographic grids and location information of the plurality of first geographic grids.

In a method of revising an unstable location fingerprint database for an area, a plurality of initial location fingerprint databases, comprising at least a stable location fingerprint database and an unstable location fingerprint database, are accessed. Signal measurement data is collected together with motion-based data from each of a plurality of portable devices transiting a portion of the area of the unstable location fingerprint database. Reference positions associated with locations in the unstable location fingerprint database are determined by using the stable location fingerprint database to process the collected signal measurement data and the motion-based data into the reference positions. The reference positions and the signal measurement data are employed to revise unstable data in the unstable location fingerprint database.

In a method of maintenance of a location fingerprint database for an area, signal measurement data is collected together with motion sensor data from each of a plurality of portable devices transiting a portion of the area of the location fingerprint database. The motion sensor data is collected by a sensor assembly in each of the plurality of portable devices. Offline non-causal processing is used to process the collected motion sensor data into reference positions associated with the portion of the area. The collected signal measurement data is employed together with the reference positions to update the location fingerprint database.

A method includes obtaining first movement information of a to-be-located device. The method also includes obtaining a target time threshold based on the first movement information. The method further includes obtaining a first scan timestamp corresponding to a target time and a first media access control MAC address, where the target time is a fingerprint collection time of a first fingerprint or a maximum value of a scan timestamp corresponding to at least one MAC address included in the first fingerprint. The first MAC address is included in the first fingerprint. The method additionally includes, if a difference between the target time and the first scan timestamp is greater than the target time threshold, determining that access point information corresponding to the first MAC address is residual access point information.

The location of a mobile device may be determined based on information that includes the signal strength of nearby radiation sources. The system may disregard information associated with radiation sources that are determined to be mobile.

A method, apparatus and computer-readable storage medium are provided that maintain a database including information identifying of one or more mobile devices. Each mobile device of the one or more mobile devices is configured to enable positioning based on radio signals. The positioning enabled by the respective mobile device is considered to be at least partially unexpected.

A method is disclosed that includes obtaining one or more pieces of spoofing information indicative of a data set enabling positioning based on radio signals sent by a respective radio node. The data set is further indicative of one or more parameters based on which said positioning is performed and/or controlled and which is considered to be at least partially unexpected. The method further includes aggregating spoofing information based on the one or more parameters of the respective data set of the one or more pieces of spoofing information; and providing at least a part of the aggregated spoofing information for usage in a positioning. A corresponding apparatus, computer-readable storage medium and system are also disclosed.

A method is disclosed that includes obtaining one or more pieces of threat information indicative of a data set enabling positioning based on radio signals sent by a respective radio node. The data set is further indicative of one or more parameters based on which said positioning is performed and/or controlled and which is considered to be at least partially unexpected. The method also includes utilizing the one or more pieces of threat information in a positioning. In order to obtain the one or more pieces of threat information, the method includes at least one of: obtaining the one or more pieces of threat information by using an application programming interface; or obtaining the one or more pieces of spoofing information by using a push method. A corresponding apparatus, computer-readable storage medium and system are also disclosed.

A map data correcting method for correcting map data used in a vehicle using a controller includes executing a first correction process of uniformly offsetting the map data as a whole to reduce a first error that is a general position error of the map data and executing a second correction process of reducing a second error that is a position error still remaining in the map data even after uniformly offsetting the map data as a whole.

An integration navigation device and method in which wireless signal strength data collecting and processing module obtains first position information of a target to be detected; a MEMS sensor data collecting and processing module obtains, according to state change information of the target to be detected, second position information of the target to be detected; a data integration module integrates the first position information and the second position information and feeds back the integrated result to the wireless signal strength data collecting and processing module and the MEMS sensor data collecting and processing module to perform data processing of the next moment.