contrib: SDA OCT Standard 3.1.0 class optical terminal and ground station - #99
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jimsweeney wants to merge 1 commit into
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…tion Adds antenna patterns (Gaussian optical), a C-band band profile with a rate table derived from the standard's irradiance and BER requirements, platform definitions with APD receivers and pointing constraints, and network nodes. Every value is tagged spec or assumed in the README.
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Adds
contrib/sda_oct_class_terminal/: a free-space optical terminal of the class defined by the public SDA Optical Communication Terminal Standard 3.1.0, with an optical ground station to close a space-to-ground link, as Spacetime entities:ANTENNA_PATTERNfor the space terminal and the ground station (Gaussian optical apertures)BAND_PROFILEfor one ITU C-band channel, with a rate table derived from the standard's irradiance requirement (OCT-038) and BER requirement (OCT-039)PLATFORM_DEFINITIONfor both ends: transmitter, APD receiver, antenna, pointing and sun-angle constraints, and a 20 degree elevation mask on the ground stationNETWORK_NODEfor both ends, plus a line incontrib/README.mdThe README tags every value as either spec (with the requirement number from the standard) or assumed (a representative value consistent with the standard, to be replaced by a terminal's datasheet), and includes a consistency check: with the assumed 1 W and 20 urad half-angle, the mean irradiance at 5,500 km under 4 urad rms jitter is 48.7 uW/m^2 against the 25 uW/m^2 requirement, 2.9 dB of margin.
One point for the maintainers: the contrib README describes the directory as real hardware used in real networks. This entry is a standards-class terminal rather than a specific vendor's unit, and it says so; if that puts it outside the directory's scope I am happy to move it (for example under an
examplesorstandardssubdirectory) or withdraw it.Validation: every payload block parses under the strict
text_formatparser against the message types generated from this repository's protos (api/common/platform.proto,api/common/channel.proto,api/nbi/v1alpha/resources/antenna_pattern.proto,api/nbi/v1alpha/resources/network_element.proto); thecontrib/loonfiles and theentity_samplestutorial pass the same check.nbictlwas built from source at this revision.🤖 Generated with Claude Code
https://claude.ai/code/session_014wyj5iPSHmtR3vSTvJWKfw