1 Weekly Summary Weekly Summary Formation Flight AEM4332 Spring Semester March 7,2007 Masao SHIMADA

2 Subsystems [ Formation Flight] Last Week

3 Relative orbit control and Navigation ▪ Decided to use GPS to determine the satellite's location in orbit. ▪ Used STK to create a scale model of possible orbits for our satellites which kept them within our specified distance of 300 meters. ▪ Wrote Matlab code to determine the required delta V needed to get into the orbit, and to determine the separation distances between the space shuttle and the satellite.

4 Last Week Configuration & Structural Design ▪ Changed some dimensions on the Solid Works model of the satellite structure as well as modeled thrusters. ▪ Discussed the transmission method to be used for transmitting the pictures.

5 Last Week Attitude Determination & Control ▪ Sensors for Attitude determination --- Earth sensor, Gyro sensor, and magnetic sensor. ▪ Optimal & lead-compensator control designs of zero-momentum attitude angle by disturbance torque (roughly simulated on Matlab)

6 Last Week Thermal Control ▪ Thermal Mathematical Model (CubeSat) Electrical Power Supply ▪ Power distribution ▪ Estimate the mass for solar arrays+ batteries and primary batteries

7 Last Week Systems Integration & Management ▪ Trade study between recoverable and non- recoverable satellites. ▪ Found information on the orbiter's robot arm and determined the feasibility of using the shuttle to capture our satellite.

8 Next Week Subsystems [ Formation Flight]

9 Next Week Relative orbit control and Navigation ▪ Find out what the safety regulations are for proximity operations near the space shuttle so that we can determine the final orbit. ▪ Determine the delta V to both get into orbit, and to return to the shuttle. ▪ Determine the tank size necessary for the spacecraft by taking into consideration the flow rate for each thruster and the estimated number of maneuvers necessary in order to keep it within orbit specifications.

10 Next Week Configuration & Structural Design ▪ Continue to modify the spacecraft structure to obtain a favorable configuration. ▪ Continue to model and place the hardware.

11 Next Week Attitude Determination & Control ▪ Trade study of Sensors ---Angle, Angular velocity (Gyro), and Acceleration sensors.

12 Next Week Thermal Control ▪ Thermal Mathematical Model --- Difference approach to unsteady analysis ▪ Trade study of Thermal control elements Electrical Power Supply ▪ Study power regulation for satellite ▪ List the pros & cons between solar array & primary battery for trade study ▪ Determine power budget for continous and non- continous operation (if applicable)

13 Next Week Systems Integration & Management ▪ Recovery equations ▪ Finish finding safety guidelines for maneuvering close to the shuttle.

14 Formation Flight Questions