Deployment Module was the Carrier for the CYGNSS Constellation

The Deployment Module (DM, developed by Sierra Nevada) served as the constellation carrier during launch and deployed the Observatories into their proper orbital configuration once on orbit. It secured the 8 Observatories during launch and released them into orbit based on a sequence initiation command from the launch vehicle. To accomplish this, the DM interfaced with the launch vehicle's standard payload adapter with 2 tiers of 4 Observatories each.

The DM was fabricated and tested by Sierra Navada Corporation. The Observatory separation mechanism on the DM-side was the SNC QwkNut that used a segmented nut actuated by a shape metal alloy trigger. The Observatory side of the separation mechanism was a 5/16" nut housed within the Bolt Retractor assembly. The kinematic interface between the DM and Observatories was a cup/cone triad and four kick-off spring modules. The kick-off springs were "tuned" via shims to provide the required force to meet the separation velocity requirements.

Within the DM was the SwRI-provided Deployment Module Avionics Unit (DMAU). The DMAU provided command and telemetry interface between Ground or Airborne Support Equipment and the Observatories so they could be monitored and tested while integrated on the DM.


Related Papers

The CYGNSS Flight Segment; A Major NASA Science Mission Enabled by Micro-Satellite Technology


Related Links

Sierra Nevada Corporation: Deployment Module

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