1 / 34

Detailed Design Review

This project aims to create a bidirectional telemetry system enabling real-time flight data transmission to ground, integrating with control systems and on-board camera triggering. The system design includes two Digi X-Tree radios with high throughput, a PC GUI application for data display, and thorough testing protocols. Battery and mounting considerations are also detailed, along with software application requirements for reporting and controlling UAV variables.

higginsj
Download Presentation

Detailed Design Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Detailed Design Review R09230 Project Family P10231 - UAV Telemetry

  2. Outline • Mission Statement • Customer Needs • Deliverable Summary • System Architecture • Subsystem Design • Bill of Materials • Risk Assessment

  3. Mission Statement Carried on UAV Airframe C The goal of this project is to create an open source, multi platform, bidirectional telemetry system. Interface with Control System(P10236) Send flight data to ground Remotely Trigger On-Board Camera

  4. Deliverables Wireless System for Bidirectional Communication between control system and ground PC GUI Application that displays flight data multi platform, open-source, in real-time

  5. System Design

  6. Radio Goals: Two radios that send and receive data with high throughput and data integrity. The radios should be transparent to both the control system and base station as if it were a physical connection. This “radio as a wire” concept allows interchangeability of various radios using different wireless technologies.

  7. Radio Components Radio: 2 Digi Xtends PKG 900 MHz. Ground Antenna: 65’’ 8.1 dBi Omni-directional antenna. UAV Antenna: 6’’ 2.1 dBi Omni-directional antenna.

  8. Specifications

  9. c Speed of Light L Wavelength f Frequency Pr Power Received Pt Power Transmitted Gr Receiving Antenna Gain Gt Transmitting Antenna Gain R Distance Between Antennas Analysis

  10. Analysis

  11. Testing Transfer of Serial Data: • Connect computer to each radio • Transmit data using simple terminal program • Tester confirms data is accurate • Repeat at both available baud rates to confirm proper orientation

  12. Testing Range: • Place one radio in a high place and the another on a mobile platform • Send data back and forth between the radios using an automated program • Move away with the mobile radio until you can no longer receive data.

  13. Interface Radio >> Controller DB 9 M/F cable Molded Radio >> Computer Serial Cable USB to Serial Adapter

  14. Power Supply Power solution must... sustain radio communication throughout flight time. not interfere with other on-board power systems. Components: Battery: 11.1V 5500mAh Li-Poly Lipo Battery Pack

  15. Specifications

  16. Analysis Current requirement for radio: Battery Current mA x Time hours=mAh 900 mA x 1 Hour=900 mAH Battery Life: Battery Current Rating /Current Draw = Run Time 5500 mAh/900 mA=6.11 hours

  17. Testing • Battery Life: • Connect battery across a ten ohm resistor and monitor its output voltage until it drops below the level that is accepted by the radio • The time it takes the voltage to drop below the acceptable amount is the approximate run time of the battery

  18. Interface Battery >>Radio: • Barrell power connector , size type M (5.5mm x 2.1mm barrell type connector) • Battery output cables will be soldered to connector

  19. Mounting and Packaging The Mounting and Packaging solution must... securely attach the aerial radio and power systems to UAV C. provide protection to onboard components in the event of a hard landing. add minimal weight to the system. add minimal size to the system. allow for easy access to components.

  20. Mounting and Packaging

  21. Specifications

  22. Analysis m1 = 0.2 kg m2 = 0.364 kg k1 = 1310 N/mm k2 = 592 N/mm Vi = 6 m/s • Assumptions: • Motion of system is considered to be free vibration • Foam acts a linear spring • PCB in radio is analogous to PCBs used in phones • m1 and m2 are homogenous • Damping can be neglected • Can simplify to a system with two degrees of freedom

  23. Analysis FBD 1 FBD 2 Mass and stiffness Matrices Equations of motion Normalized stiffness Matrices Natural Frequency Matrix Eigenvector Matrix Kt = M-1/2KM-1/2 w = [w1 w2]T P = [v1 v2]

  24. Analysis . Initial conditions for modal coordinates Displacement of modal coordinates Displacement Response Displacement Response

  25. Analysis . Max Temperature: Assumptions: • Radio is well insulated • Energy usage is 1 Watt • Ambient Temperature is 37.8 C • Run time is 45 minutes Insulation Eg=2700 J mradio=0.2kg DTmax=42.2 C Radio Eg Eg = mcpDT

  26. Testing . Overheating: • Run the system in an environment that is insulated similarly to our system. • Monitor the temperature of the radio while it is running. • If the radio stays within its operating temperature for longer then the planned flight time we can be sure it will not overheat in the UAV.

  27. Interfaces . • System >> UAV C • System will be attached to UAV C using Industrial strength Velcro. • Housing >>Battery/Radio • Industrial strength Velcro will be used to secure the battery/radio to the housing

  28. Software Software application must... report all flight data through a visual interface. track and log UAV control variables. transmit remote shutter command. support multiple computing platforms. maintain open source concepts. refresh at acceptable rate.

  29. Software Design

  30. GUI Design Flight Plan

  31. GUI Design Flight Info

  32. GUI Design Data View

  33. Bill of Materials Bill of Materials

  34. Risks Risk Management

More Related