General Information

This section describes the purpose and main characteristics of the system.

Purpose

This appendix describes, for educational and historical purposes, the types of algorithms that were considered in the software architecture of a Control Correction Station (CCS) within a Regional Navigation Field Control Point (RPKNP). The appendix explains how such algorithmic groups relate to the following CCS tasks:

  • Reception and preliminary processing of measurement and digital information from navigation receivers included in the CCS and data from equipment determining tropospheric characteristics.
  • Statistical processing of measurement information from navigation receivers.
  • Current analysis of measurement information, including navigation-field integrity control and analysis of navigation receiver quality.
  • Formation of differential correction information (DCI) and control of its quality.
  • Educational description of encoding concepts for measurement and other types of information in data exchange with the Navigation Field Control Center (CKNP).
  • Educational description of DCI encoding concepts in RTCM SC-104 message format for regional-user data exchange.

Characteristics

This appendix also provides an educational overview of how algorithmic functions for processing CCS measurement information may be coordinated, how software functions are related, and how processing stages can be described in sequence.

In the described architecture, data exchange between software functions is represented through a database (DB).

Notation Rules

The notation of parameters used in this appendix is formed according to the following rules:

  • The first subscript indicates the number of the navigation receiver whose measurements are being processed.
  • The second subscript, if present, indicates the number of the NSS (Navigation Spacecraft) to which it corresponds.
  • To distinguish between the stages of processing the same parameter, the last subscript (second or third) is used, containing a conditional number of the function that forms it:
    • 1 - preliminary processing;
    • 2 - filtering of measurement information;
    • 3 - application of corrections accounting for tropospheric delay.
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