GPS Prn Assignments

Satellite Cross Identification

Analytical Graphics (AGI) keeps an up-to-date history of the GPS satellites, including a PRN history for all satellites on their FTP site. The table below is a readable version of this file. The file can be accessed here:

ftp://ftp.agi.com/pub/Catalog/Almanacs/SEM/GPSData.txt

Rows in bold are currently active GPS satellites. Other rows are GPS satellites that are no longer active. The SVN number for a satellite is always unique, but the PRN for a satellite can be reused. When a GPS satellite is no longer in service, its PRN is given to a new GPS satellite.

Last updated: 4/21/2021 9:27:13 PM
PRN	SVN	Block	Active	Active start	Active stop
1	32	GpsBlockIIA		Feb 01, 1993	Mar 19, 2008
1	49	GpsBlockIIRM		Apr 02, 2009	May 23, 2010
1	63	GpsBlockIIF	Active	Jul 23, 2011
2	13	GpsBlockII		Apr 07, 1991	May 14, 2004
2	61	GpsBlockIIR		Nov 14, 2004	Dec 23, 2007
2	61	GpsBlockIIR	Active	Dec 26, 2007
3	11	GpsBlockI		Apr 07, 1991	Apr 10, 1994
3	33	GpsBlockIIA		Apr 10, 1996	Aug 04, 2014
3	69	GpsBlockIIF	Active	Nov 02, 2014
4	34	GpsBlockIIA		Nov 19, 1993	Nov 05, 2015
4	74	GpsBlockIII		Oct 12, 2019	Oct 21, 2019
4	74	GpsBlockIII	Active	Oct 24, 2019
5	35	GpsBlockIIA		Sep 30, 1993	Mar 28, 2009
5	50	GpsBlockIIRM	Active	Aug 23, 2009
6	3	GpsBlockI		Apr 07, 1991	May 31, 1992
6	36	GpsBlockIIA		Apr 01, 1994	Feb 23, 2014
6	67	GpsBlockIIF	Active	May 22, 2014
7	37	GpsBlockIIA		May 30, 1993	Dec 22, 2007
7	48	GpsBlockIIRM	Active	Mar 21, 2008
8	38	GpsBlockIIA		Nov 22, 1997	Nov 28, 1997
8	38	GpsBlockIIA		Dec 13, 1997	Nov 01, 2014
8	38	GpsBlockIIA		Jan 10, 2015	Mar 28, 2015
8	72	GpsBlockIIF	Active	Jul 19, 2015
9	39	GpsBlockIIA		Jul 04, 1993	May 21, 2014
9	68	GpsBlockIIF	Active	Aug 05, 2014
10	40	GpsBlockIIA		Aug 11, 1996	Jul 18, 2015
10	73	GpsBlockIIF	Active	Nov 06, 2015
11	8	GpsBlockI		Apr 07, 1991	May 09, 1993
11	46	GpsBlockIIR		Jan 08, 2000	Nov 12, 2020
12	10	GpsBlockI		Apr 07, 1991	Mar 24, 1996
12	58	GpsBlockIIRM	Active	Nov 24, 2006
13	9	GpsBlockI		Apr 07, 1991	Apr 24, 1994
13	43	GpsBlockIIR		Aug 24, 1997	Aug 31, 1997
13	43	GpsBlockIIR	Active	Sep 14, 1997
14	14	GpsBlockII		Apr 07, 1991	Apr 15, 2000
14	41	GpsBlockIIR		Dec 22, 2000	Jul 11, 2020
14	77	GpsBlockIII	Active	Nov 13, 2020
15	15	GpsBlockII		Apr 07, 1991	Nov 19, 2006
15	55	GpsBlockIIRM	Active	Oct 27, 2007
16	16	GpsBlockII		Apr 07, 1991	Oct 05, 2000
16	56	GpsBlockIIR	Active	Feb 07, 2003
17	17	GpsBlockII		Apr 07, 1991	Feb 25, 2005
17	53	GpsBlockIIRM	Active	Oct 02, 2005
18	18	GpsBlockII		Apr 07, 1991	Aug 17, 2000
18	54	GpsBlockIIR		Feb 17, 2001	Mar 07, 2018
18	34	GpsBlockIIA		Mar 10, 2018	Oct 11, 2019
18	34	GpsBlockIIA		Jan 06, 2019	Apr 06, 2019
18	75	GpsBlockIII	Active	Mar 14, 2020
19	19	GpsBlockII		Apr 07, 1991	Sep 13, 2001
19	59	GpsBlockIIR	Active	Mar 27, 2004
20	20	GpsBlockII		Apr 07, 1991	Oct 06, 1996
20	20	GpsBlockII		Nov 10, 1996	Dec 08, 1996
20	51	GpsBlockIIR	Active	Jun 03, 2000
21	21	GpsBlockII		Apr 07, 1991	Jan 29, 2003
21	45	GpsBlockIIR	Active	Apr 09, 2003
22	22	GpsBlockIIA		Feb 26, 1993	Jun 01, 2003
22	22	GpsBlockIIA		Jun 05, 2003	Aug 08, 2003
22	47	GpsBlockIIR	Active	Dec 28, 2003
23	23	GpsBlockIIA		Apr 07, 1991	Feb 15, 2004
23	60	GpsBlockIIR		Jul 01, 2004	Mar 13, 2020
23	76	GpsBlockIII	Active	Jul 12, 2020
24	24	GpsBlockIIA		Jul 25, 1991	Sep 14, 2009
24	24	GpsBlockIIA		Dec 24, 2009	Nov 06, 2011
24	65	GpsBlockIIF	Active	Oct 09, 2012
25	25	GpsBlockIIA		Mar 22, 1992	Aug 22, 2009
25	25	GpsBlockIIA		Sep 15, 2009	Dec 20, 2009
25	62	GpsBlockIIF	Active	May 24, 2010
26	26	GpsBlockIIA		Jul 16, 1992	Jan 08, 2015
26	71	GpsBlockIIF	Active	Mar 29, 2015
27	27	GpsBlockIIA		Sep 27, 1992	Aug 12, 2011
27	27	GpsBlockIIA		Dec 18, 2011	Oct 08, 2012
27	66	GpsBlockIIF	Active	May 20, 2013
28	28	GpsBlockIIA		Apr 26, 1992	Aug 17, 1997
28	28	GpsBlockIIA		Sep 07, 1997	Sep 07, 1997
28	28	GpsBlockIIA		Nov 08, 1997	Nov 08, 1997
28	44	GpsBlockIIR	Active	Aug 26, 2000
29	29	GpsBlockIIA		Jan 03, 1993	Oct 25, 2007
29	57	GpsBlockIIRM	Active	Dec 25, 2007
30	30	GpsBlockIIA		Oct 03, 1996	Jul 22, 2011
30	35	GpsBlockIIA		Aug 13, 2011	May 03, 2013
30	64	GpsBlockIIF	Active	Feb 24, 2014
31	31	GpsBlockIIA		Apr 11, 1993	Oct 26, 2005
31	52	GpsBlockIIRM	Active	Oct 04, 2006
32	32	GpsBlockIIA		Dec 11, 1992	Jan 24, 1993
32	23	GpsBlockIIA		Jun 30, 2007	Jan 27, 2016
32	70	GpsBlockIIF	Active	Feb 11, 2016

Navigation blog entries

Gps Basics
The basics of how GPS works with some technical content.

How Long Can You Use an Almanac?
GPS position data is contained in almanac files. Learn how long you can use these for analysis.

Selection of my published papers

Understanding GPS Navigation in Contested Environments
Review of GPS errors, their source and how we can mitigate them. Review of terrain datums and their operational usage and an overview of alternative navigation techniques.

Operational Considerations for Improved Accuracy with an IOC Galileo Constellation
This paper looks at how the Galileo operators can improve the performance of an initial Galileo constellation by managing their ephemeris and clock errors. Keeping those errors small can help keep initial positioning errors small, even when large DOPs are present.

Long term prediction of GPS accuracy - Understanding the Fundamentals
Topics on prediction methods for GPS and how long GPS errors can be predicted. Starting from an understanding of the elements of prediction, including almanac use and ephemeris and clock errors, I look at the statistics of GPS position error predictions under various scenarios.

Statistical Analysis of Military and Civilian Navigation Error Data Services
This paper examines the difference between ephemeris and clock errors generated using civilian data versus those generated using military data. The different data sources result from civilian GPS receiver and military GPS receiver.