Reactive Rendezvous and Docking Sequencer

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$599,794.00
Award Year:
2011
Program:
SBIR
Phase:
Phase II
Contract:
NNX11CB29C
Award Id:
n/a
Agency Tracking Number:
095357
Solicitation Year:
2009
Solicitation Topic Code:
S5.04
Solicitation Number:
n/a
Small Business Information
CO, Boulder, CO, 80302-5233
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
361720787
Principal Investigator:
Christopher Grasso
Principal Investigator
(720) 720-8897
christopher.a.grasso@earthlink.net
Business Contact:
Christopher Grasso
President
(720) 394-8897
christopher.a.grasso@earthlink.net
Research Institution:
Stub




Abstract
Mars Sample Return poses some of the most challenging operational activities of any NASA deep space mission. Rendezvous of a vehicle with a sample canister in order to return the canister to Earth requires a variety of complex mathematical processing on a changing data set, coupled with the need to safely and effectively handle a large range of off-nominal conditions and spacecraft faults. Light speed delay isolates the spacecraft from real-time operator intervention, while inertial and situational uncertainties demand reactivity not required of typical spacecraft sequencing systems. These mission features call for a new class of sequence capability: Reactive Rendezvous and Docking Sequencer (RRDS).RRDS melds the rule-based reactivity needed for rendezvous and docking with sequence characteristics common to more traditional missions. Rules watch for conditions in order to react to the current situation, allowing a wide range of complex activities and safety-related responses to be concisely represented without complex procedural programming. Responsibility for commanding elements aboard the spacecraft is divided among sequenced state machines called managers, coordinated together by a flight director which the ground commands.Underlying flight software for navigation, thruster allocation, inertial checking, attitude estimation and control, contact detection, docking mechanisms, and the like receive direction from the managers. This mediated control causes the system to reactively operate in modes with proper ordering of activities. Reactive operations are represented explicitly by states and transitions defining the managers, and do not require use of explicitly timed activities.Phase II of this SBIR will produce a Class B version of the underlaying VML 2.2 flight software capable of executing the RRDS state machines. It will also produce Class C versions of the associated VML compiler and Offline VM execution system for deployment onto flight projects.

* information listed above is at the time of submission.

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