1. John Dixon Communications Group Lead Locomotion Phase Lead
Final Slides
John Dixon
Communications Group Lead
Locomotion Phase Lead 1
[John Dixon] [Communications]

2. Data Transmission Requirement
In order to transmit data to successfully achieve GLXP req’s:
Need to have power available to transmit over distance from the Moon to Earth
Power req. to achieve desired data transmission rate
From Lander to Earth:
Power Req: 50 W
Data Rate: 51.2 kbps
From Rover to Lander
Power Req: 5 W 2
[John Dixon] [Communications]

3. SpaceBall Thermal Managment
Nitrogen Gas = high Specific Heat, low mass, efficient heat transporter
Temperature rise without thermal management would cause the SpaceBall’s to overheat almost instantly
Temperature rise over 8 minutes: 0.7K
Thermal System
Nitrogen Gas Mass = 0.01 kg
Absorptivity of Z-93 = 0.17
Energy to be Dissipated = 6500 KJ 3
[John Dixon] [Communications]

4. Thermal Transport Over Time
Steady State Equilibrium Occurs at ~50 seconds
Total Temperature Rise Over 8 min = 0.7K
[Name] [Group]

5. Lander to Earth Transmission
[Name] [Group]

6. Rover to Lander Transmission
[Name] [Group]