P17571: Sunspot Radio Telescope
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Detailed Design

Table of Contents

Team Vision for Detailed Design Phase

Plans of the Detailed Design Phase

Our overall team plan for this phase was to, as always, improve on the designs posited in the previous phase. A major new goal of this phase was to make preparations for MSDII by creating a variety of documentation as well as uploading and organizing files on EDGE.

The computer engineering team found the complete Arduino code from our predecessor team at the beginning of the phase, and their goals quickly shifted to accommodate this new development. The team planned to spend time delving into the code to better understand its purpose. In addition, with the arrival of the UPS, the team planned to explore the potential for integrating UPS functionality into the Arduino software.

The electrical engineering team planned to order a remote antenna switch based off our previous analysis. Given this addition to the overall system, a change to the electrical schematic would be required. The team also planned to work with the mechanical engineer to plan out the placement and mounting of the newly arrived UPS within the available project space in the PC box.

Accomplishments of the Detailed Design Phase

The computer engineering team integrated the UPS into the system and made sure that it performed with the correct functionality. They also studied and were able to confirm that the code found at the end of last phase and beginning of this one was in fact close to the latest code from that last team that can be flashed down to the Arduino to control the dish motor and actuator. The FTP script that was found on the E-Callisto website was integrated and tested.

The electrical engineering team received the UPS and remote antenna switch. The team implemented both devices into the electrical schematic, creating a more complete picture of our overall system. In addition, the team cleaned up some of the wiring in the PC box with the help of the mechanical engineer, taking the opportunity created by shortening some of the cables from the PC box to the dish.

The mechanical engineer designed a housing for the remote antenna switch. The remote antenna switch will reside in the smaller box along with the eCallisto box and two of the four calibration methods (50-ohm termination and the calibration kit). This housing will ensure a stable connection between the remote antenna switch and the calibration devices while providing an easier mounting method.

Progress Report

Objectives for this phase

Objectives Met

Objectives Not Met

Decisions Made this Phase

Further questions for Customer/Guide

Drawings, Schematics, Flow Charts, Simulations

Remote Antenna Switch Case Housing

RAS Device (Model made from manuf. schematic)
public/Photo Gallery/RAS.PNG
Bottom-half of RAS Housing, slotted hole allows for the front SMA port to shift while its 2 left SMA ports go into their respective holes.
public/Photo Gallery/housingslot.PNG
Top-half of RAS Housing, area cut out for the wiring from the rest of system
public/Photo Gallery/Topcase_RAS.PNG
Top-down View of Assembly
public/Photo Gallery/TopHousing.PNG
Front View of Assembly
public/Photo Gallery/FrontHole.PNG
Items to note:

UPS Mounting Inside PC Box

Mounting choices are currently under development. Design Requirements:

Current UPS constraint ideas:

Upper Level System Block Diagram

For a full sized image of the above block diagram, click the image above.

Circuit Schematic

For a full sized image of the above schematic, click the image above.

Code Requirements

Bill of Material (BOM)

Cost Report

http://edge.rit.edu/edge/P17571/public/Detailed%20Design%20Documents/Cost%20report%201.0/costs%202.0.png

Bill of Materials

http://edge.rit.edu/edge/P17571/public/Detailed%20Design%20Documents/Cost%20report%201.0/BOM%203.0.png

Parts List

http://edge.rit.edu/edge/P17571/public/Detailed%20Design%20Documents/Cost%20report%201.0/parts%20list%203.0.png

Test Plans

A unified list of detailed test plans has been created in this test plan, which was driven by the Engineering Requirements below. As tests are performed/refined, this document will be modified accordingly to provide a centralized document for test plans and results.
ER No. Source From CR Importance (1-5, 5=highest) Category Requirements Unit Ideal Value Acceptable Value Planned Test Test Results Details
ER1 CR1, CR12 5 Mechanical Device housing weatherproofing IPx Rating IPx7W IPx4* Leave System running overnight in various weather conditions Incomplete Wiring is still under progress
ER2 CR1, CR12 4 Mechanical Environment temperature °F 68-75 10-95* Leave System running overnight in various weather conditions Incomplete Wiring is still under progress
ER4 CR7, CR11, CR12 5 Mechanical Feed horn antenna bandwidth range MHz 30-900 50-890 Send a signal at the high and low end of the bandwidth Incomplete Feedhorn has not been purchased yet.
ER5 CR6, CR12 4 Electrical UPS operating time minutes 15 10 Fully charge UPS and attach to system then remove power cable. Undocumented Exceeded expectations
ER6 CR1, CR2, CR8, CR11, CR12 5 Electrical Remote antenna autocalibration precision % error 5* 10* Input antenna frequency with known output, compare it to measured. Incomplete Obtained switch, awaiting cables
ER7 CR10, CR12 2 Electrical Low noise amplifier gain dB * * - Incomplete Temporarily on hold, as it might not be in budget.
ER8 CR1, CR2, CR3, CR4, CR5, CR9 CR12 5 Software Remote data collection & transfer rate to Zurich Mbps 25* 23* Send data from computer to Zurich on their FTP and observe. Complete Sent a file from system computer to Zurich with login provided.
ER9 CR1, CR2, CR4, CR5, CR12 5 Software E-Callisto Sampling Rate Samples/sec 1 10 Take a data set and see if the data is precise enough over a time span. Complete System Spec sheet.
ER10 CR1, CR2, CR8, CR11 4 Software No. of times system is calibrated per day calibrations/day 1 2 Check System log and scheduler to see how many times system was calibrated In Progress Pending test plan/procedure
ER11 CR1, CR2, CR4, CR12 4 Software Error checking accuracy for data collection % error 1 5 Send a corrupt data file to server and see if the system detects it. In Progress Need to verify corrupt file, if not detected, won't be used by Zurich.
ER12 CR1, CR3, CR5, CR6, CR7, CR8 CR9, CR10, CR12 3 Misc Project Cost Dollars ($) <500 500 None In Progress Adhearing to budget and have set aside funds for aspects needing money
ER13 CR1, CR3, CR5, CR6, CR7, CR8 CR9, CR10, CR12 5 Software Arduino code can operate Motor and LA to high accuracy % Pos. Error <1% 1% Attatch the motor, LA, power to system, check if Radio Eyes operates In Progress Awaiting 1st upload to arduino
Change Log:
  1. Removed ER3 because UPS was ordered to fit the enclosure.
  2. Updated ER5 progress with UPS basic UPS test result
  3. Updated ER6 progress with arrival of antenna switch
  4. Updated ER 10 and 13 with discovery of arduino code

Risk Assessment

Risk ID Category Risk Item Effect Cause Likelihood, L (1-3) 3=most Severity, S (1-3) 3=Worst Importance, L*S (1-9) 9=most Action to Minimize Risk Owner
R1 Technical Improper feedhorn installation Feedhorn may have loose mounting or be unable to be assembled. Heating or cooling during drilling. 1 3 3 Use heat sink and lubricant during feedhorn installation Mechanical Engineer
R2 Technical Unreliable internet connection to Zurich Packets of information could be dropped Severe thunder storms or overcast weather 3 1 3 Provide data backup until Zurich server confirms reception Computer Engineer
R3 Technical Dish may be too heavy for motors/actuators Tracking functionality is lost, manual repairs required Ice buildup, power depletion, errors in measurements 1 2 4 Provide flags and warnings to warn users of imminent disruption Computer Engineer
R4 Technical File transfer system error Zurich server receives incomplete data High frequency of power interrupts beyond design of UPS 1 2 2 Provide data backup until Zurich server confirms reception Computer Engineer
R5 Technical Auto-calibration error Incorrect data analysis, manual repairs required Drift of control systems over time 2 3 6 Provide recurring updates to autonomous calibration results Computer Engineer
R6 Technical TeamViewer software error Remote operation made difficult or impossible Incorrect data structures and / or program speed 3 1 3 Use cross-platform coding techniques Computer Engineer
R8 Technical RadioEyes/LabView incompatibility Additional time required for integration solution Incorrect data structures and / or program speed 1 2 2 Use cross-platform coding techniques Computer Engineer
R9 Technical Feedhorn selection may carry unexpected collaterals (integration) RX levels may become inefficient for extraction from raw signal Mismatching impedance and frequency response 2 2 4 Perform extensive testing on feed/dish assembly Electrical Engineer
R10 Technical eCallisto software error Data may be corrupted or incorrect; Zurich may not recieve data at all Improper program setup / unforeseen program error 1 2 2 Perform extensive software testing and provide data backup Computer Engineer
R11 Technical Internal EM interference within subsystems May cause errors in computer operation or other subsystem operation Improper magnetic shielding on power lines near vulnerable systems 1 2 2 Isolate magnetic interference, or place wiring more carefully Electrical Engineer
R12 Technical Improper power management One or more subsystems failing due to internal power loss Power delivery system insufficient to meet power needs 1 3 3 Perform extensive power system simulations Electrical Engineer
R13 Technical Internal subsystem overheating Damage to one or more subsystems Improper cooling systems or lack of temperature sensor 2 3 6 Place temperature sensors in overheat locations Mechanical Engineer
R14 Resource Scarcity of integration and/or testing facilities Project receives unexpected delays waiting for facilities Primary facilities are 1 hour away. 2 1 2 Establish carpools and overlap schedules to ensure effective use of lab All
R15 Resource Insufficient budget to meet all project requirements May need to take performance hits to accommodate cheaper budget Limited funds (~$500) 1 1 1 Design and build where possible All
R16 Resource Destruction of "Suntracker" project hardware Loss of unique designed hardware, project delays Incorrect assumptions about input levels and tolerances 1 3 3 Implement strict guidelines for interacting with unique hardware All
R17 Resource Inadequate space to assemble and test Team may not be able to prove that the project works Necessary space or devices not easily available 1 3 3 Ensure that proper space or devices are reserved well in advance All
R18 Resource Theft of system components Irreplaceable components may be lost Improper storage of materials 1 3 3 Lock physical project materials in a locker All
R20 Resource Critical team member or project sponsor becomes unavailable Project will be more difficult to complete without assistance from team member or guidance from sponsor Team member or sponsor is injured or unavailable 1 1 1 Obtain guidance from faculty advisors; Maintain team awareness All
R21 Resource Insufficient manufacturing tools available One or more subsystem additions may not be able to be completed Limited budget and/or resources of RIT or sponsors 1 2 2 Prioritize subsystems based on accessibility All
R27 Resource Missing parking code Rewrite code Code not found 3 1 3 Contact prior team Computer Engineer
R23 Safety Team member injury during construction Slowed rate of project work while team member recovers Improper safety measures taken during construction and use 1 2 2 Observe proper safety rules during device construction and operation All
R24 Environmental/Social Other unwanted data could be intercepted Zurich server recieves incorrect data Improper selection of device reciever frequency 1 2 2 Observe proper FCC rules and regulations Computer Engineer
R25 Environmental/Social Transmission of RF data could cause interference Remote operation difficulty, conflict with TV/radio stations Improper selection of device transmittal frequency 1 2 2 Observe proper FCC rules and regulations Computer Engineer
R26 Environmental/Social Remote log-in to unit may pose security threat Sensitive data may restrict remote login Malicious actor obtaining password/login information 1 3 3 Ensure strict security in regard to username/ password information All

Change Log:

  1. Removed Risk 7: UPS Incorrect AC Power due to leakage currents and parasitics
  2. Removed Risk 19: Insufficient Data Storage. FIT file estimation improved.

Action Items for MSD II

The action items that we have to address moving forward include: MechEng:

CompSci:

ElecEng:

General:

Plans for next phase


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