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User Defined Data

User Defined Data. Formerly known as Enhanced Validation Test Plan (EVTP) in previous SimGEN versions Allows the use of user generated ASCII text files to supplement or modify the data specified in the GPS Constellation GPS satellite motion Navigation Data Ionospheric delay

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User Defined Data

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  1. User Defined Data • Formerly known as Enhanced Validation Test Plan (EVTP) in previous SimGEN versions • Allows the use of user generated ASCII text files to supplement or modify the data specified in the GPS Constellation • GPS satellite motion • Navigation Data • Ionospheric delay • Tropospheric delay User Defined Data (enable and drop-down)

  2. User Defined Data - Files • Satellite Orbital Data: Used to define the motion of the simulated GPS satellites. (File extension is .EPH) • Satellite Ephemeris Data: Used to define the broadcast Navigation Data sets for satellite ephemeris and clock parameters. This file has the same format as the orbital data file. (File extension is .EPH). • Almanac Nav Data: Used to define the broadcast almanac data for the satellite orbits. (File extension is .ALM). • Almanac Upload: Used to define the broadcast almanac data for the satellite orbits after an upload. (File extension is .ALM). • Global Nav Data: Used to define certain Navigation Data fields, in particular the UTC parameters and ionospheric coefficients. (File extension is .GBL) • Ionospheric Delay: Used to define the ionospheric delay characteristics over a given period for each satellite explicitly, using a simple quadratic expression. (File extension is .ION). • Tropospheric Delay: Used to define the tropospheric delay characteristics over a given period for each satellite explicitly, using a simple quadratic expression. (File extension is .TRO). • Nav Data Modification: Used to overwrite selected elements of the broadcast Navigation Data message for specified GPS satellites. (File extension is .NAV). • IEEE Control Messages: Used to transmit commands to the signal generator hardware at specified times. (File extension is .HW_MSG).

  3. User Defined Data • Files are ASCII based and can be edited with any text editor • Operation as follows: • In normal operation SimGEN uses the information specified in the GPS Constellation file to determine the selection and signal characteristics of the satellites to be simulated when running a scenario. • When User Defined Data is enabled for a scenario, then the information contained in these files supersedes the satellite characteristics normally applied, otherwise these are as specified by the GPS Constellation file • For example: If only the almanac nav data was assigned, the satellite would be simulated as normal, except for the broadcast almanac data, which would be as defined in the user defined data file (*.alm). • All file formats described in the SimGEN User Manual, Chapter 24 User-defined data (EVTP)

  4. User Defined Data Examples Satellite Orbital and Ephemeris Data Almanac Nav and Upload Data

  5. User Defined Data Examples (cont.) Global Navigation Data Navigation Data Modification

  6. User Defined Data Examples (cont.) Ionosphere Delay Troposphere Delay

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