SEARCH FOR A NEW GORIZONT TROPOSCATTER STATION ON THE YAKUTSK-MAGADAN GORIZONT LINE, USSR

Document Type:

CREST [1]

Collection:

NGA Records (Formerly NIMA) [2]

Document Number (FOIA) /ESDN (CREST):

CIA-RDP78T04759A010400010006-6

Release Decision:

RIPPUB

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Document Creation Date:

December 28, 2016

Document Release Date:

July 31, 2003

Sequence Number:

Case Number:

Publication Date:

February 21, 1974

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File:

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CIA-RDP78T04759A010400010006-6.pdf [3]	100.66 KB

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Approved For Release 2003/08/21 : CIA-RDP78TO4759AO10400010006-6 TOP SECRET O 21 February 1974 Copy 4 N11 DOPY RETURN TO DSh SUBJECT : Search for a new GORIZONT Troposcatter Station $1H U17, H q. on the Yakutsk-Magadan GORIZONT Line, USSR REQUIREMENT NSA/V24/R-175-74 (NPIC Project 340045) 1. In response to the referenced requirement, a search centering on Yudoma-Krestovskaya (60-05N 139-52E) was performed to find indica- tions of a new GORIZONT troposcatter station. Three troposcatter stations, Uts-Maya, Ynykchanskiy and Okhotsk, on the Yakutsk-Magadan GORIZONT line were also examined for changes in antenna types and/or antenna azimuths. All areas were covered by fair-to -good photography from late 2. A search of the area defined by a 10-nautical mile (nm) radius centered on Yudoma-Krestovskaya revealed no indications of a troposcatter station. No significant activity was observed in the area except logging operations. 3. Reanalysis of the troposcatter antenna types and their orien- tations at Okhotsk Troposcatter Station I I confirmed that the original identification of four Type 11/i an accurate. Antenna orientations arel I to Magadan and l Ito Ynykchanskiy. These orientations are nearly identical to those pre- viously reported. Also, the antenna azimuth of the Okhotsk-Ynykchanskiy link ( is identical to a computer-derived azimuth between these two locations. 4. Reanalysis of the antenna types and their orientation was also accomplished at Ynykchanskiy Troposcatter Station West-northwest This reanalysis confirmed the updated description of two Type an two Type IIA troposcatter antennas at this station. The Type II antennas are oriented on a azimuth of to Ust-Maya Troposcatter Station and the ype antennas are oriented on a azimuth of 105 degrees to Okhotsk Troposcatter Station. Also, reanalysis of early photography indicates that no change in antenna types has occurred at this station. The original identification of four Type IIA antennas was based on extremely poor imagery. Type II and Type IIA antennas have always been present. WARNING NOTICE Sensitive Intelligence Sources and Methods Involved. CLASSIFIED BY: 009907 Exempt from General Declassification Schedule of E.O. 1t652, Exemption Category: 5B(2) LA SIFIEDON Y DEC 25X1 25X1A 25X1 D 25X1 25X1 D 25X1 AU ATALL PATE E IMPO IMPOSSIIILETO DETERMINE 2~ EC~R ~~ approved F- or Release 200 /2 ? I P78TO4759A010400010006-6 Approved] For Release 200qin-Q .?l CI~ p1 i'o_O 59AO1040001000 2 x~ I v [~ C u 21 February 1974 z ~C SUBJECT: Search for a new GORIZONT Troposcatter Station on the Yakutsk- Magadan GORIZONT Line, USSR 5. The lack of alterations along the Yakutsk-Magadan GORIZONT line was further substantiated by reexamining the photography of the Ust-Maya Troposcatter Station. This analysis showed that the previous identifi- cation of four Type IIA antennas is in error. The antennas originally installed at this station were two Type II antennas oriented 25X1 D toward Ynykchanskiy Troposcatter Station and two Type IIA antennas, oriented 310 degrees, toward Yakutsk. No changes in antennas have been seen at this station. Thus, the Ust-Maya - Ynykchanskiy GORIZONT Tropo- scatter link is via Type II antennas, which is appropriate for the distance separating the two stations. 6. Further inquiries should be directed to Communications Branch, Missiles and Space Division, Imagery Exploitation Group, NPIC, code 143, Chief, Missiles and pace ivision NPIC Distribution: Cy 1&2 - NSA/V24 3 - NSA/L0/NPIC 4 - CIA/DDI/IRSAI 5 - CIA/IAS 6 - DIADC-1C 7 - DIADS-4A1 (SAO) 8 - NPIC/PSG/RRD/IB/ESS 9 - NPIC/PSG/RRD/TDPB 10&11 - NPIC/IEG/MSD/CB 12 - NISC 13 - AF/INAKB 14 - AFIS/INYD 15 - NPIC/IEG 25X1 A' 25X1A 25X1A 25X1 Approved For Release 2003J06P21Sca478T04759A010400010006-6 Approved For Release 2003/08/21 : CIA-RDP78TO4759AO10400010006-6 Approved For Release 2003/08/21 : CIA-RDP78TO4759AO10400010006-6