Application Note AN-AGNSS-2510

GNSS Ephemeris Data — FTP Access via AGNSS Casting Service

1. Introduction

This application note describes how to access high-rate GNSS ephemeris (broadcast ephemeris) data through the DATAGNSS AGNSS casting service. The data is pulled in real-time from the upstream AGNSS source and made available via a public FTP server, refreshed every 5 minutes.

Target audience: GNSS receiver firmware developers, base station operators, and positioning algorithm engineers who need up-to-date satellite ephemeris for assisted GNSS (A-GNSS) or real-time positioning.

2. FTP Server Information

To obtain login credentials, contact info@datagnss.com and reference this application note (AN-AGNSS-2510). A dedicated account will be provisioned for your organization.

3. Available Data Files

All files listed below are updated every 5 minutes from the upstream AGNSS source.

4. Access Methods

4.1 Command Line (curl)

# List available files
curl --user <username>:<password> ftp://agnss.datasource.ltd:21/

# Download a single file
curl --user <username>:<password> \
  ftp://agnss.datasource.ltd:21/HD_GPS.hdb \
  -o HD_GPS.hdb

# Batch download all .hdb files
curl --user <username>:<password> ftp://agnss.datasource.ltd:21/ \
  | grep ".hdb" \
  | awk '{print $NF}' \
  | xargs -I{} curl --user <username>:<password> \
    ftp://agnss.datasource.ltd:21/{} -o {}

4.2 Windows File Explorer

Type directly into the address bar:

ftp://<username>:<password>@agnss.datasource.ltd:21

Press Enter — the remote directory appears as a local folder for browsing and copying.

4.3 FTP Client (FileZilla / WinSCP / etc.)

5. Limitations

• Download only — upload and delete operations are not permitted.
• Max 2 concurrent connections per IP address. Additional connections will be rejected.
• Plain FTP (no FTPS/TLS) — data is transferred in cleartext. Suitable for automated ingestion pipelines behind firewalls.

6. Revision History

7. Contact

For access requests, technical questions, or support inquiries:

DATAGNSS Co., Ltd.
Email: info@datagnss.com

Please reference AN-AGNSS-2510 in your correspondence.