Differential relay method and device for global navigation satellite system

Abstract

The invention relates to the technology of communication, and discloses a differential relay method and device for a global navigation satellite system. According to the invention, the method comprises the steps: enabling a transmission region of a server to be divided into a plurality of grid units, setting at least one differential relay in each grid unit; calculating a difference correction number of each differential relay through the server, and transmitting the position information of each relay and the difference correction numbers to a user terminal, so that the user terminal employs the position information and the difference correction number of the differential relay nearest to the user terminal for differential positioning, thereby facilitating the use of differential services. Moreover, the server can meet the demands of a large number of users only if the server calculates a fixed number of difference correction numbers, thereby improving the coverage and usability of the differential services. In addition, the user terminal does not need to upload the position information of the user terminal to the server, can carry out differential positioning through obtaining the difference correction number of the nearest differential relay according to the position information of each differential relay, and guarantees the crypticity of a user.

Description

technical field [0001] The invention relates to communication technology, in particular to a differential relay method and device for a global navigation satellite system. Background technique [0002] With the development and popularization of satellite positioning technology, computer network technology and communication technology, the public's demand for location-based services is becoming more and more prominent. However, the inventors of the present invention have found that the current positioning service also has the following disadvantages: [0003] 1. When a GNSS (Global Navigation Satellite System, Global Navigation Satellite System) user terminal uses traditional GNSS differential services, it must upload the current NMEA (National Marine Electronics Association, National Marine Electronics Association) GGA position information of the GNSS user terminal. NMEA is also the data transmission standard NMEA 0183, which defines the standard information output by the r...

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Problems solved by technology

Therefore, uploading the NMEA GGA position information makes the personal information of the GNSS user terminal potentially leaking

[0004] 2. In the future, GNSS differential services will be oriented to a large number of publics at different levels and with different needs, while traditional GNSS differential service platforms have limited terminal capacity (generally, the maximum capacity is 300-600), and data processing and user access will also cause a load on the central service platform Pressure, communication blockage and data delay cause user terminals to be unable to obtain GNSS differential services, and even cause the GNSS differential service platform to crash

At present, there is no GNSS differential service platform with large capacity and large concurrency at the level of one million, ten million or even one hundred million at home and abroad

[0005] 3. Traditional GNSS differential services generally broadcast GNSS differential correction information through Internet (Internet) or UHF (Ultra High Frequency) / VHF (Very High Frequency) radio stations. There is a signal coverage hole

There is a large spatial distance between the user terminal and the reference station and data center, and the communication link will also cross operators, which will inevitably increase the data transmission delay

[0007] 5. When the traditional GNSS differential service platform is an internal private network, it is inconvenient to directly provide GNSS differential services to the public. GNSS user terminals must use a customized SIM card (Subscriber Identity Module card, referred to as "SIMcard") to obtain GNSS differential information, which improves the Threshold for public users to access GNSS differential services

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