12 releases
new 0.1.0-beta.19 | Nov 26, 2024 |
---|---|
0.1.0-beta.10 | Jul 1, 2024 |
0.1.0-beta.7 | Jun 14, 2024 |
0.1.0-beta.4 | Apr 2, 2024 |
0.1.0-alpha.5 | Jan 29, 2024 |
#278 in Science
Used in rdr
2MB
2.5K
SLoC
ccsds
CCSDS Spacecraft Data Stream Decoding
[!WARNING] This project is very much in development, and the API is very likely to change in ways that will things. If you have comments or suggestions regarding the API feel free to file an issue.
The project provides tools for decoding spacecraft downlink telemetry streams conforming
to the CCSDS
recommended specifications (Blue Books)
TM Synchronization and Channel Coding
and Space Packet Protocol
.
Supports:
- Framing
- Stream synchronization
- Pseudo-noise removal
- Reed-Solomon FEC
- Spacepacket decoding
- Telemetry packets, i.e., packets with type 0
- Sequencing
- Packet groups
- Limited support for secondary header timecodes
- CCSDS Day Segmented timecodes
- NASA EOS timecodes for Aqua and Terra spacecrafts
- Provided but not directly used
Examples
The following example shows how to decode an unsynchrozied byte stream of CADUs for
the Suomi-NPP spacecraft. This example code should work for any spacecraft data stream
that conforms to CCSDS TM Synchronization and Channel Coding
and Space Packet Protocol
documents.
use std::fs::File;
use std::io::BufReader;
use ccsds::{ASM, FrameDecoderBuilder, Synchronizer, decode_framed_packets, collect_packet_groups, PacketGroup};
// 1. Synchronize stream and extract blocks (CADUs w/o ASM)
let file = BufReader::new(File::open("snpp.dat")
.expect("failed to open data file"));
let blocks = Synchronizer::new(file, &ASM.to_vec(), 1020)
.into_iter()
.filter_map(Result::ok);
// 2. Decode those blocks into Frames
let frames = FrameDecoderBuilder::default()
.reed_solomon_interleave(4)
.build(blocks);
// 3. Extract packets from Frames
// Suomi-NPP has 0 length izone and trailer
let packets = decode_framed_packets(157, frames, 0, 0);
References:
CCSDS
Space Packet Protocol
TM Synchronization and Channel Coding
TM Synchronization and Channel Coding - Summary of Concept and Rationale
Related
- spacecraftsdb: JSON Spacecraft metadata database
- spacecrafts-rs: Rust create for
spacecraftsdb
- ccsdspy: Python bindings for
ccsds-rs
License
GNU General Public License v3.0
Dependencies
~6–19MB
~222K SLoC