Method, apparatus, and related device for identifying GNSS pseudolite data

An apparatus, comprising:

• a processor and a memory, wherein the memory is configured to store a computer program, and the processor is configured to invoke the computer program stored in the memory, wherein the computer program instructs the processor to:
• receive, a first piece of first data from an access network device, wherein the first piece of first data comprises first ephemeris information and/or first almanac information;
• receive, a plurality of pieces of first data from a plurality of different access network devices, wherein each of the plurality of different access network devices acquires the plurality of pieces of first data from a first satellite, the plurality of pieces of first data comprises the first piece of first data and at least one of a plurality of pieces of first ephemeris information or a plurality of pieces of first almanac information in the plurality of pieces of first data correspond to the first satellite;
• and
• determine, abnormal first data based on the plurality of pieces of first data to detect global navigation satellite system (GNSS) pseudolite data, wherein the abnormal first data is determined as an outlier in the plurality of pieces of first data, wherein the outlier is determined based on at least of:
• a difference between the first piece of first data and a median of the plurality of pieces of first data is greater than a pre-defined threshold, or
• by clustering the plurality of pieces of first data into majority and minority classes and identifying a minority class as abnormal,
• wherein, prior to the determining, a piece of ephemeris information that does not satisfy a periodicity requirement is excluded from the plurality of pieces of first data;
• and updating the plurality of pieces of first data by excluding the abnormal first data identified as GNSS pseudolite data for performing time synchronization.

A system, wherein the system comprises:

• a target device comprising a first processor and a first storage medium;
• and
• an access network device comprising a second processor and a second storage medium configured to store second instructions to be executed by the second processor to cause a network manager to:
• send, a first piece of first data to the target device, wherein the first piece of first data comprises at least one of first ephemeris information or first almanac information;
• and
• wherein the first storage medium is configured to store instructions to be executed by the first processor to cause a service manager to:
• receive, the first piece of first data from the access network device;
• receive, a plurality of pieces of first data from a plurality of different access network devices, wherein each of the plurality of different access network devices acquires the plurality of pieces of first data from a first satellite, the plurality of pieces of first data comprises the first piece of first data and at least one of a plurality of pieces of first ephemeris information or a plurality of pieces of first almanac information in the plurality of pieces of first data correspond to the first satellite;
• and
• determine, abnormal first data based on the plurality of pieces of first data to detect global navigation satellite system (GNSS) pseudolite data, wherein the abnormal first data is determined as an outlier in the plurality of pieces of first data, wherein the outlier is determined based on at least one of the:
• a difference between the first piece of first data and a median of the plurality of pieces of first data is greater than a pre-defined threshold, or
• by clustering the plurality of pieces of first data into majority and minority classes and identifying a minority class as abnormal,
• wherein, prior to the determining, a piece of ephemeris information that does not satisfy a periodicity requirement is excluded from the plurality of pieces of first data;
• and updating the plurality of pieces of first data by excluding the abnormal first data identified as GNSS pseudolite data for performing time synchronization.