1 May 18, 2007Team # 7103: METEOR Instrumentation Platform M.E.T.E.O.R. Instrumentation Platform Matt Lipschutz Rashmi Shah Adam Gutterman Jessica DeSignor Rick Frisicano Peter Rozwood Sponsor:

2 May 18, 2007Team # 7103: METEOR Instrumentation Platform Overview MMicrosystems EEngineering and TTechnology for the EExploration of OOuter Space RRegions Balloon Platform Rocket Picosat Track Objective: Develop a low-cost balloon- assisted in-air rocket launch system capable of placing small (~1kg) satellite payloads into a low- earth orbit (LEO).

3 May 18, 2007Team # 7103: METEOR Instrumentation Platform Instrumentation Platform Project Objective: –Further develop an independent balloon-lofted computational platform capable of monitoring the environment and communicating in near real time with ground control stations Key Customer Needs: –Transition component infrastructure to MSP430 microprocessor –Design and implement RF power amplifier for video transmission –Design and implement custom portable microcontroller-based OSD –Develop modular transient thermal model –Analyze and redesign legacy components such as radios and sensors

4 May 18, 2007Team # 7103: METEOR Instrumentation Platform System Block Diagram

5 May 18, 2007Team # 7103: METEOR Instrumentation Platform Packaging Created geometric models of main components, circuit boards, and assemblies. Arranged items to fit inside 8”x8”x3.5” envelope for future fit into the Glider (METEOR 07108)

6 May 18, 2007Team # 7103: METEOR Instrumentation Platform Exploded Model

7 May 18, 2007Team # 7103: METEOR Instrumentation Platform Thermal Analysis Created transient thermal model of the instrumentation platform during flight using ANSYS Workbench software Set up important properties as parameters that can be easily modified to investigate multiple scenarios Set variable and steady-state properties to initial default values selected though research

8 May 18, 2007Team # 7103: METEOR Instrumentation Platform Thermal Simulation Results With the initial set of parameters, the results predict that the electronics do not dissipate enough heat to keep the platforms internal temperature in a safe operating range. The internal temperature drops below -40°C at approximately 52,000ft.

9 May 18, 2007Team # 7103: METEOR Instrumentation Platform Controller and Sensors MSP430: Primary functions: –Process ground control commands –Data collection: GPS: position, altitude, speed, heading Sensors: temperature, pressure, humidity and accelerometer –Generate data packets for the following: Transmission to ground based receivers Video text overlay Future Improvements –Develop a standard data package for radio transmission to ground control –On board data storage

10 May 18, 2007Team # 7103: METEOR Instrumentation Platform Controller Flowcharts

11 May 18, 2007Team # 7103: METEOR Instrumentation Platform Inputs: NTSC Video signal (1vp-p, 3.5MHz baseband), 8-bit custom serial communication (max frequency 1MHz) Output: NTSC Video signal with data from serial displayed on bottom of screen On-Screen-Display (OSD)

12 May 18, 2007Team # 7103: METEOR Instrumentation Platform W 2 R I T M E T E O R 4 Collate to binary value Calculate decimal value Character Generation

13 May 18, 2007Team # 7103: METEOR Instrumentation Platform OSD Program Flowcharts

14 May 18, 2007Team # 7103: METEOR Instrumentation Platform Video Transmitter Flowchart The purpose of the transmitter is to transmit the video signal from the Instrumentation Platform to ground MAX MHz Quadrature Transmitter Internal registers allow for IF frequency tuning to 120MHz – 125MHz Upconverts to a RF frequency of MHz on the 70cm band Includes a tuning voltage V GC from 0.5V to 2.5V to provide an output power of 8dBm – 30dBm RA07H4047M power amplifier module takes an input power of 20dBm and outputs at least 7W of power

15 May 18, 2007Team # 7103: METEOR Instrumentation Platform MAX2370 Evaluation Kit Design taken from MAX2370 EV Kit (left) and customized to fit our needs

16 May 18, 2007Team # 7103: METEOR Instrumentation Platform Video Transmitter PCB Layout 4 Layer Board –Top layer (top left) –Bottom layer (top right) –Inner power layer +3V –Inner ground layer 50 ohm traces for matching

17 May 18, 2007Team # 7103: METEOR Instrumentation Platform Radio Data Link Facilitates communication between platform and ground –Downlink: Sent position reports and sensor data Can be received directly with specialized receivers Data posted automatically to Internet using existing infrastructure: required only a URL to access –Uplink: Received commands from ground station and sends them to central processor

18 May 18, 2007Team # 7103: METEOR Instrumentation Platform Radio Data Link: Block Diagram & Notable Features Range: 100+ miles Redundancy –Extra GPS and circuitry: Position reports are still sent even if central microprocessor fails –Low-power non- directional beacon for short-range tracking (range ~0.4 mi)

19 May 18, 2007Team # 7103: METEOR Instrumentation Platform Data Radio Results Designed redundancy setup was insufficient and failed in flight Transmitter system did not report position data reliably; final position unknown Extensive search failed to locate IP using only non-directional beacon frequency Future work: move backup position reporting system to completely independent power source to aid recovery in case of similar failure

20 May 18, 2007Team # 7103: METEOR Instrumentation Platform Power System Design Improved Efficiency: –Linear: 3.3V at 20% efficiency to 80% efficiency using new switcher (from 18V) –Linear: 12V at 75% efficiency to 95% efficiency using new switcher (from 18V) Surface mount parts (latest switching power supplies) New voltage rails (+/-12, +5, +3.3) all use switching voltage regulators Low cost: $50.43 out of a $10,000 group budget Have the ability to supply all components including the 3A requirement on the +12 V rail

21 May 18, 2007Team # 7103: METEOR Instrumentation Platform Power System Schematic

22 May 18, 2007Team # 7103: METEOR Instrumentation Platform Power System PCB Layout

23 May 18, 2007Team # 7103: METEOR Instrumentation Platform Power System Performance 3.3, 5, and +12 V rails were within 1/100 volts of accuracy. –12 was within.5 V of accuracy Improvements: –adding a power switch –Replacing –12 V regulator with one that can run off of +18 V instead of +12 and can power exactly –12 V instead of –11.5 V –Adding a set of holes on all four sides of the board for attachment onto the platform frame. Other than those improvements, the power system ran as expected.

24 May 18, 2007Team # 7103: METEOR Instrumentation Platform QUESTIONS ?