Gonets / Strella constellation Monitoring:                                                                                                  Updated (13/03/2010 21:31:37 -0000)

Status = Work In Progress.

Gonets is a Russian low earth orbit, store and forward data communications system. It uses satellites which downlink in the 259.5-265.2 MHz, 387-390 MHz and 1541.0-1541.9 MHz. Uplinks are (from sources on the Internet) 312-315 MHz and 1624.5-1643.4 MHz. The satellite orbits are 1,400 km high inclined at 82.5, with only some of the satellites carry digital store and forward payloads. Data rates are 2.4 Kbps for the uplink and 9.6 Kbps for the downlink, with GMSK modulation. Strella satellites are basically the military equivalent of Gonets.

Maik at SatelliteWelt has a page listing some Gonets downlink frequencies here

www.uhf-satcom.com

The table below was created by Hans Oeben - previous work by xBr and #hearsat members (counterstrike, r00t, pjm, gonzo, Kodar, KJN, Freq).

Object		Satellite 	Catalog Constell.	Freq.		Beep	Freq.		Information and
name:		Designator:	nr.:	group:		1:		sec.:	2:		Remarks:			
Cosmos 2341	1997-017A	24772	Parus		149.9100	n/a	399.9200	No activity heard
Cosmos 2398	2003-023A	27818	Parus		149.9100	n/a	399.7600	No activity heard
Cosmos 2279	1994-024A	23092	Parus		149.9400	n/a	399.8400	
Cosmos 2454	2009-038A	35635	Parus		149.9400	n/a	399.8400	
Cosmos 2366	1999-045A	25892	Parus		149.9400	n/a	399.8400	No activity heard
Cosmos 2378	2001-023A	26818	Parus		149.9400	n/a	399.8400	No activity heard
Cosmos 2336	1996-071A	24677	Parus		149.9700	n/a	n/a		No activity heard
Cosmos 2389	2002-026A	27436	Parus		149.9700	n/a	399.9200	No activity heard
Cosmos 2407	2004-028A	280380	Parus		149.9700	n/a	399.9200	
Cosmos 2414	2005-002A	28521	Parus		149.9700	n/a	399.9200	
Cosmos 2346	1997-052A	24953	Parus		150.0300	n/a	400.8000	No activity heard
Cosmos 2361	1998-076A	25590	Parus		150.0300	n/a	400.0800	No activity heard
Cosmos 2429	2007-038A	32052	Parus		150.0300	n/a	400.0800	
Cosmos 2353	1998-036B	25364	Strela-3	244.5125	29	261.0350	 
Cosmos 2384	2001-058A	27055	Strela-3	244.5125	n/a	261.0350	No activity heard. 
Cosmos 2385	2001-058B	27056	Strela-3	244.5125	07	261.0350	 
Gonets D1-8	2001-058E	27059	Strela-3	244.5125	54	261.0350	Changed Cosmos 2386
Cosmos 2390	2002-036A	27464	Strela-3	244.5125	12	261.0350	 
Cosmos 2391	2002-036B	27465	Strela-3	244.5125	22	261.0350	 
Cosmos 2400	2003-037A	27868	Strela-3	244.5125	31	261.0350	 
Cosmos 2401	2003-037B	27869	Strela-3	244.5125	45	261.0350	 
Cosmos 2408	2004-037A	28419	Strela-3	244.5125	17	261.0350	 
Cosmos 2409	2004-037B	28420	Strela-3	244.5125	37	261.0350	 
Cosmos 2437	2008-025B	32954	Strela-3	244.5125	50	261.0350	 
Cosmos 2438	2008-025C	32955	Strela-3	244.5125	04	261.0350	 
Cosmos 2439	2008-025D	32956	Strela-3	244.5125	35	261.0350	 
Cosmos 2451	2009-036A	35498	Strela-3	244.5125	08	261.0350	 
Cosmos 2452	2009-036B	35499	Strela-3	244.5125	n/a 	261.0350	No activity heard
Cosmos 2453	2009-036C	35500	Strela-3	244.5125	33	261.0350	 
Gonets D1-1	1996-009A	23787	Gonets		264.400	17	n/a	no	
Gonets D1-2	1996-009B	23788	Gonets		263.000	32	n/a	no	
Gonets D1-3	1996-009C	23789	Gonets		265.1375	49	no		After 04/11 ID-beep change from 33sec --> 49 sec.
Gonets D1-4	1997-006D	24728	Gonets		264.7500	33	no	
Gonets D1-5	1997-006E	24729	Gonets		261.0375	n/a	no		"No ID-Beep, only databeeps in range of USSR"
Gonets D1-6	1997-006F	24730	Gonets		264.900	47	n/a	no	 
Gonets D1-7	2001-058D	27058	Gonets		263.000	43	n/a	no	 
Cosmos 2386	2001-058C	27057	Gonets		264.900	58	n/a	no		Gonets D1-8 
Gonets D1-9	2001-058F	27060	Gonets		262.9125	n/a	no		"No ID-Beep, only databeeps in range of USSR"
UNID		UNID		Unid	Unid		261.0375	n/a	no		"No ID-Beep, only databeeps in range of USSR"

Gonets and Strella transmissions are relatively short and finding them is difficult. #hearsat members use SDR-14 receivers to watch 1MHz of spectrum in order to locate the transmission bursts from the satellites, these bursts when out of range of a ground station are 300-500mS long. The pictures below show two waterfall plots of the frequencies in use by Gonets, as can be seen, the bursts are short, but the GMSK modulation sidebands can clearly be seen. There is no doubt that without the SDR-14 these signals would take a lot longer to locate. Even with a commercial spectrum analyser, because the lack of waterfall display functions, the signals would only appear for <1 second, and would be impossible to catch.

www.uhf-satcom.com
www.uhf-satcom.com

User terminals for Gonets. On the left is a typical antenna, on the right is the modem / interface unit.

www.uhf-satcom.com www.uhf-satcom.com

Update 23/12/2005 08:30

2 distinct transmissions were heard, one on 265.945MHz with short PSK bursts, and 262.914MHz with GMSK as per the other Gonets in the series.

295.945MHz

262.914MHz

Please contact uhf-satcom.com if you have any updates or corrections to the info on this page.