Systems Engineering

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SE7 LunarGEM Requirements

Part 1:
Column topics:
1. Is the requirement stated properly? Y/N
2. What is the requirement position? P-parent, C-child, P&C-parent & child, O-orphan 3. Is the requirement’s rationale good or bad? G/B with good defined as understandable and clearly justifies the specific requirement. 4. Is the requirement functional, non-functional or a constraint? F/NF/C 5. Is this requirement verifiable? Y/N

6. Should this requirement even be a requirement? Y/N
7. Were specific standards, say from NASA, referenced in the requirement or rationale? Y/N

| Questions Regarding Requirements|
Requirement| 1| 2| 3| 4| 5| 6| 7|
1.1.1.1| The spacecraft shall be launched to Earth orbit using a launch vehicle selected by the NASA Discovery Program.| Y| Child| G| F| Y| Y| N| 1.1.2.1| The launch vehicle shall place the Orbital Transfer Vehicle (OTV) on a trans-lunar trajectory from Low Earth Orbit (LEO) to Low Lunar Orbit (LLO).| Y| Child| G| F| Y| Y| Y| 1.1.3.1| The spacecraft shall maintain communications in transit to lunar orbit.| N| Child| B| F| Y| Y| N| 1.1.3.2| The OTV spacecraft shall perform course corrections during trans-lunar coast| Y| Child| G| F| Y| Y| N| 1.1.4.1| The OTV shall provide the delta V required enter lunar orbit| Y| Child| B| F| Y| N| N| 1.1.5.1| Lunar seismic vehicles shall separate from the OTV after lunar orbit insertion and descend to the surface of the moon| Y| Child| G| F| Y| Y| N| 1.1.6.1| The lunar landing sites shall be selected based on recommendations of the mission science team| Y| Child| G| NF| N| N| N| 1.1.7.1| The lunar seismic vehicle shall secure the seismometers to the moon’s sub-regolith rock| N| Child| G| F| N| Y| N| 1.1.8.1| The seismometers shall be calibrated once emplaced on the lunar surface| N| Child| B| F| N| Y| N| 1.1.9.1| Once calibrated, the lunar seismic network shall operate for six months, with the potential for an extended mission| Y| Child| G| C| Y| Y| N| 1.2.1| LunarGEM shall deploy a globally-distributed network of seismometers on the moon| N| Child| G| F| N| N| N| 1.2.2| LunarGEM seismometers shall be five times as sensitive to seismic waves as the Apollo passive seismometers| Y| Child| B| C| Y| Y| N| 2.1.1.1.1| The spacecraft shall be compatible with the all launch vehicle interfaces and comply with size restrictions of the payload fairing| N| Child| G| C| Y| Y| N| 2.1.1.1.2| The structure of the seismic vehicle shall withstand descent, landing, and placement on the lunar surface| N| Child| B| C| N| Y| N| 2.1.1.2.1| The mass of LunarGEM shall be within the capacity of the launch vehicle selected by the NASA Discovery Program| Y| Child| G| C| N| Y| N| 2.1.1.3.1| The thermal control subsystem (TCS) shall monitor and control temperatures of components on the lunar seismic vehicles and the OTV| N| Child| B| F| N| Y| N| 2.1.1.4.1| The Guidance Navigation and Control (GNC) subsystem of the OTV shall monitor and control the attitude and trajectory of the OTV| N| Child| B| F| N| Y| N| 2.1.1.4.2| The GNC subsystem of each seismic vehicle shall monitor and control the descent trajectory and vehicle orientation| N| Child| B| F| N| Y| N| 2.1.1.5.1| The communication subsystem shall provide data uplink and downlink between Earth-based groundstations and the LunarGEM spacecraft| Y| Child| G| F| Y| Y| N| 2.1.1.5.2| The communication subsystem shall forward recorded data from each seismometer to Earth ground stations| N| Child| B| F| N| Y| N| 2.1.1.6.1| The OTV propulsion subsystem shall provide attitude and course correction burns for the OTV| Y| Child| G| F| Y| Y| N| 2.1.1.6.2| The OTV propulsion subsystem shall provide the delta V necessary for lunar orbit insertion|

| Y| Child| B| F| Y| Y| N|...
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