We hope this presentation has shown how a constellation of spacecraft in lunar halo orbits could provide communication and navigation support for missions to the Moon. Using halo orbits has several distinct advantages with savings in payload mass and operations costs. Low-energy transfers would allow many spacecraft to be launched on a single vehicle to a halo orbit. These spacecraft could separate and be distributed to various mission orbits for very little ΔV. Liaison Navigation could provide autonomous orbit determination for the constellation and reduce operations costs.
A very low-cost technology demonstration mission could be conducted using two small spacecraft to validate the BLT and Liaison Navigation techniques discussed here. These small satellites could then be used to provide data relay for the first round of robotic lunar exploration missions, such as a possible RLEP-2 mission to the south pole of the Moon.
This constellation could actually alleviate some of the demands on Earth-based networks such as the DSN instead of adding additional burden. Also, this type of operation could be performed by a commercial enterprise in a manner similar to the COTS program where commercial entities provide a resupply service to the ISS. That would further reduce the funds and work needed by NASA to perform this task. For more information, feel free to contact us or read our publications.

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