# GPS Block IIF 3D model

> Shape built from published dimensions and pictures; details simplified.

Free 3D model of GPS Block IIF, a satellite, built from published dimensions by Space Radar. 10,088 triangles, 54 kB glTF, MIT.

- **Class:** Satellites
- **Mission:** Navigation
- **Triangles:** 10,088
- **File:** gps-iif.glb, 54 kB, glTF 2.0 binary (meshopt)
- **Look:** Flat colours
- **Size:** 13 m across
- **Made:** Built from dimensions
- **Added:** 2026-10-13
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/gps-iif.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/gps-iif.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=gps-iif
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** GPS Block IIF 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/gps-iif/

## How it was made

Built in code from published dimensions and photographs, with no image-to-3D generator and no one else’s mesh. 3D model: built by Space Radar from published dimensions and a US Air Force painting of a GPS Block IIF satellite.

built by this project in code (the private tool model-from-images: assemble.py, from a yaml of primitives), from the cited dimensions and the pictures under `references`; no image-to-3D model was used, and no published mesh (NASA's 3D Resources on GitHub, 1 583 paths read 2026-10-13, has none of this craft; the survey of 2026-10-13 found no agency model of it under usable terms)

## Dimensions

- Bus 1: 2.5 m
- Bus 2: 2.1 m
- Bus 3: 1.8 m
- Span: 13.11 m

Source: eoPortal, https://www.eoportal.org/satellite-missions/gps, OPENED 2026-10-13, 'Table 1: GPS Block specifications', column Block IIF: 'Dimensions (m)' '2.5 x 2.1 x 1.8'; 'Span including solar arrays (m)' '13.11'; 'Primary Contractors' 'Boeing North American'; and its text: 'The first GPS Block IIF satellite (SVN-62) launched on May 27, 2010. The launch vehicles provided direct insertion into the GPS orbit, meaning the apogee kick motor used in earlier generations was not needed.' Air & Space Forces Magazine, https://www.airandspaceforces.com/weapons-platforms/gps/, OPENED 2026-10-13: '(IIF) 9.6 x 6.5 x 12.9 ft, span incl solar panels 43.1 ft' (43.1 ft is 13.1 m: the span agrees; its body numbers do not agree with eoPortal's and are not used). ESA (F. Dilssner and others, 'Estimation of azimuthal satellite antenna PCVs', IGS Workshop 2012, https://files.igs.org/pub/resource/pubs/workshop/2012/Poland%202012%20-%20P09%20Dilssner%20PR4.pdf, OPENED 2026-10-13), 'GPS satellite antenna assembly': 'Beam-forming assembly consisting of 12 helical elements, 2 concentric circles, 4 inner elements, equally spaced. Azimuth of inner elements wrt +Y axis: IIA: 67.5, 157.5, 247.5, 337.5 deg; IIF: 22.5, 112.5, 202.5, 292.5 deg'; '12 element helix design common to all GPS and GLONASS antenna types'. THE US SPACE FORCE'S OWN FACT SHEET WAS NOT OPENED: losangeles.spaceforce.mil answers 403 to a plain request and to a reader (tried 2026-10-13); a search engine's extract of it gives '98 in wide, 80 in deep, 88 in high'. NOT CITED, read off the Air Force's painting: three panels a wing and the frame that holds them, the wing's width (1.8 m), the antenna deck as an eight-sided white plate, the size of the helices and of both rings, the long antenna at the deck's middle, the group of four at the deck's edge, the boom with a canister at its end. Which of the three body numbers lies along which axis is OURS: the 1.8 m along the Earth axis.

## References

- [Navstar-2F](https://commons.wikimedia.org/wiki/File:Navstar-2F.jpg), US Air Force (Public domain (USAF; a work of the US federal government))