1. http://tycho.usno.navy.mil/gpscurr.html, ‘Current GPS constellation’, accessed November 2009
2. Optimal binary sequences for spread spectrum multiplexing (Corresp.)
3. IS-GPS-200 Revision D: ‘Navstar global positioning system interface specification’, December 2004
4. GPS receiver architectures and measurements
5. Tsui, J.B.Y.: ‘Satellite constellation’, Fundamentals of GPS receivers: a software approach, 2nd(John Wiley & Sons 2002), p. 30–50