CGGTTS

Rust package to parse and generate CGGTTS data.

License

This library is part of the RTK-rs framework which is delivered under the Mozilla V2 Public license.

CGGTTS

CGGTTS is a file format designed to describe the state of a local clock with respect to spacecraft that belong to GNSS constellation, ie., a GNSS timescale.
Exchanging CGGTTS files allows direct clock comparison between two remote sites, by comparing how the clock behaves with respect to a specific spacecraft (ie., on board clock).
This is called the common view time transfer technique. Although it is more accurate to say CGGTTS is just the comparison method, what you do from the final results is up to end application. Usually, the final end goal is to have the B site track the A site and replicate the remote clock. It is for example, one option to generate a UTC replica.

CGGTTS is specified by the Bureau International des Poids & des Mesures (BIPM): CGGTTS 2E specifications

This library only supports revision 2E, and will reject other revisions.

Features

• serdes
• scheduler: unlock CGGTS track scheduling

CGGTTS track scheduling

If you compiled the crate with the scheduler feature, you can access the Scheduler structure that helps you generate synchronous CGGTTS tracks.

Synchronous CGGTTS is convenient because it allows direct exchange of CGGTTS files and therefore, direct remote clocks comparison.

The Scheduler structure works according to the BIPM definitions but we allow for a different tracking duration. The default being 980s, you can use shorter tracking duration and faster CGGTTS generation. You can only modify the tracking duration if you can do so on both remote clocks, so they share the same production parameters at all times.

System Time delays

A built in API allows accurate system delay description as defined in CGGTTS.

Getting started

This library only supports revision 2E, and will reject other revisions.

Add "cggtts" to your Cargo.toml

cggtts = "4"

Use CGGTTS to parse local files

use cggtts::prelude::CGGTTS;

let cggtts = CGGTTS::from_file("data/CGGTTS/GZGTR560.258");
assert!(cggtts.is_ok());

let cggtts = cggtts.unwrap();
assert_eq!(cggtts.header.station, "LAB");
assert_eq!(cggtts.tracks.len(), 2097);