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Weekly SummaryWeekly SummaryFormation Flight

AEM4332Spring Semester

March 7,2007

Masao SHIMADA

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Subsystems [Formation Flight]

Last Week

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Last Week

Relative orbit control and Relative orbit control and NavigationNavigation

▪ 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.

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Last Week

Configuration & Structural Configuration & Structural DesignDesign

▪ 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.

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Last Week

Attitude Determination & ControlAttitude 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)

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Last Week

Thermal ControlThermal Control ▪ Thermal Mathematical Model (CubeSat)

Electrical Power SupplyElectrical Power Supply

▪ Power distribution

▪ Estimate the mass for solar arrays+ batteries and primary batteries

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Last Week

Systems Integration & Systems Integration & ManagementManagement

▪ 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.

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Next Week

Subsystems [Formation Flight]

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Next Week

Relative orbit control and Relative orbit control and NavigationNavigation

▪ 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.

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Next Week

Configuration & Structural Configuration & Structural DesignDesign

▪ Continue to modify the spacecraft structure to obtain a favorable configuration.

▪ Continue to model and place the hardware.

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Next Week

Attitude Determination & ControlAttitude Determination & Control ▪ Trade study of Sensors

---Angle, Angular velocity (Gyro), and Acceleration sensors.

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Next Week

Thermal ControlThermal Control ▪ Thermal Mathematical Model --- Difference approach to unsteady analysis

▪ Trade study of Thermal control elements

Electrical Power SupplyElectrical 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)

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Next Week

Systems Integration & Systems Integration & ManagementManagement

▪ Recovery equations

▪ Finish finding safety guidelines for maneuvering close to the shuttle.

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Formation Flight

QuestionsQuestions