US Declassifies Information on JUMPSEAT Spy Satellites
The US National Reconnaissance Office has declassified information about a fleet of spy satellites operating between 1971 and 2006.
I’m actually impressed to see a declassification only two decades after decommission.
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Clive Robinson • February 4, 2026 1:53 PM
@ Bruce, ALL,
It was not the success the US hoped for.
As the article notes the CCCP were the first to use such a highly elliptical orbit, and they learned a few things that with hindsight should have been known or suspected before any satellite was put up in that orbit.
Firstly that in effect the orbit was “to high” thus had the issue of distance and noise both natural and man made.
1.1, The distance made any signal at the antenna a lot lower than would be received in a near or low earth orbit. Thus quite a lot lower compared to “natural noise.
1.2, Natural noise from the earth would be much smaller than background noise from space. As the antennas were actually “electrically small” for much of the EM Spectrum then in use a lot of space based natural noise got into the antennas at all but very high frequencies that were not used for very much by the CCCP. They had decided to use “Over The Horizon Radar” based in the HF bands and any Ham radio operator from the time can tell you about “The Woodpecker”.
1.3, Another issue was “jamming umbrella’s” it’s something that humans witness first hand at night on roads and similar. Put simply If you are standing on top of a hill several miles away, if I shine a narrowly focussed bright light in your direction you are effectively blinded. Whilst I can carry on using low level lights pointed directly at others I want to communicate with in the field I’m operating in, you can not see what I’m doing.
1.4 The basic physical design of the satellite was not very good. The spin stabilized system causes all sorts of problems when you have to “de-spin” the comparatively physically large antenna array. In effect it causes any signal received to be modulated by the rotation correction system. More modern systems that use spin stabilisation do it in a different way.
Thus these satellites whilst they gave a lot of information it was a sort of “third prize” as they did not give the level of information that was hoped for.
It’s why in part SpaceX / Starlink are putting thousands of satellites in as low an orbit hight as they can make them commercially effective.
For one it makes them quite difficult to jam as the Iranian’s have found thus were getting quite up tight about a couple of weeks back. Likewise Starlink ground terminals are small and can use very low power and tight “phased array” signals that make them inherently “Low Probability of Intercept”(LPI) made even worse for the Iranian government by the types of modulation used.
It’s known that Musk is looking into other LPI technology some of which will work in ways that the current 3GPP GSM design committees are looking at for future 6G systems.
Fun information apparently Hellon Rusk want’s to put up close to a million satellites into low earth orbits. More than a hundred times the number he’s already got in operation currently, regardless of the very real risks involved.
Supposedly to put AI-In-Space… It’s actually a very bad idea, as the heat from the work involved will be at best difficult to radiate off and well the shear physical mass involved will make such “Data Centers in space” very problematic for the very very short life time they will have.