The topic of in this cryptologic history document is the later years of the POPPY satellite ELINT collection system.  While there is a lot of public-domain data about POPPY, previous, and later satellite ELINT systems, I will concentrate on the operations of the POPPY system in about 1973.  In general, the text will stick to the TINS sea story format—first person narration, concepts simple enough to inform the reader without putting him or her to sleep, etc. However, there will be many simplified descriptions that demand a bit more explanation and illustration.  Some of those explanations, and the simulation data that illustrate the principles, may exceed the attention span of readers without any background knowledge of SIGINT or ELINT principles.  

There’s a lot of declassified data about the earlier systems: GRAB and DYNO. I’ve sorted those documents into a bin labeled “Interesting—but not applicable.”  As of 2025, there is hardly any declassified information about the successor to the POPPY system.  As of the date of this document,  NRO has only released the fact that a series of satellites called “PARCAE” were launched between 1976  and 1996 under mission numbers 7108 to 7120.

After the success of the GRAB and Poppy signals collection programs, and with increasing concerns about the Soviet Navy, the Naval Research Laboratory as part of the NRO’s Program C, developed the next system that would collect the needed information on the Soviet Union’s naval fleet. That system, Parcae, was the programmatic follow-on to GRAB and Poppy. Later on, the NRO developed the next generation of Parcae, referred to as Improved Parcae, which added the capability to collect against and recognize selected foreign communications systems.

(NRO Press Release “PARCAE  America’s Ears In Space”)

As I started researching POPPY and the US Navy program, SISS ZULU, I soon found that the NRO had released over a thousand documents in 2024 to fulfill FOIA requests.  These PDF documents are primarily scans of decades-old, printed documents and require processing with Optical Character Recognition (OCR) software to extract quotable text.  The documents were scanned and published in black and white format, so the photographs in most of the documents are not particularly useful.   However, many of the engineering illustrations in the documents are not only historically useful, but also a good example of the way scientific and technical illustration has changed in the last 60 years.

The reference documents I’ve used in this work fall into several categories:

• Public relations releases by NRO or NSA. These documents have good quality illustrations and text written for the general public.  They contain no redactions.
• Technical documents released in response to FOIA requests.   These are generally written for, and by, ELINT professionals and design engineers.  They were highly classified at initial release, and often contain lots of redactions—often several complete pages in length
• Correspondence and operational reports. These may be copies of teletype messages to and from the institutions involved in the POPPY program, or correspondence between high-ranking officers and organization leaders.  Like the technical documents, they were highly classified and contain significant redactions.  They seldom have illustrations other than a few hand-drawn diagrams.
• Technical Operations Group (TOG) meeting summaries.  These reports summarized the monthly TOG meetings between representatives of the NRO, NSA, NSG and Naval Research Laboratory (NRL).  These reports were issued to the represented organizations and to the POPPY ground station commands.  They were highly classified and are often highly redacted.

While I’ve downloaded over a thousand documents and quickly scanned through a few hundred, only a few dozen will be quoted and referenced in this document.  Since I’m concentrating on the early 1970s, when the POPPY system had evolved into a useful ocean surveillance system, you won’t find much detail about the first decade of POPPY operations. There are several reasons for this:

• By the time of the POPPY 7107 launch in 1971, the technology used in the satellites and ground stations was significantly more complex and capable than in the early versions of the satellites and ground facilities.
• As the capabilities of the POPPY system became more advanced, the demands for coverage and results multiplied.  There was a lot of budgetary competition and agency politics involved in the transition to an ocean surveillance system.  I’m a techno-nerd and those things are much less interesting to me than the technology and operations of the POPPY system. 
• Some of the longer history documents cover the budgeting and inter-agency competition in great detail.   I’ll add some links to those documents and those of you interested in that stuff can sift through the hundreds of scanned pages of dubious quality for yourselves.