Model Satellite CDR Report
Team TALIA 4A • Team #405365 • Fatih Sultan Mehmet University
A comprehensive Critical Design Review documenting the complete satellite system including 5-layer modular payload, active landing system with PID control, and custom smoke visibility mission.
Mission Overview
Mission profile: Ascent → Descent → Separation @200m → 10s Hover @150m → Recovery → Landing
1Primary Mission
- Deploy from rocket at 700m altitude
- Autonomous separation at 200m
- Active landing with PID-controlled motors
- Real-time telemetry at 1-5 Hz + live video
2Custom Missions
- Smoke Capsules: Colored smoke for visibility
- Object Detection: YOLOv4-tiny real-time AI
- Hover at 150m for 10 seconds
- Dual-channel communication (WiFi + NRF24)
My Contributions
System Lead & Operation Control Officer
System Overview
- • 5-layer modular payload architecture
- • Weight distribution & thermal management
- • Post-PDR major design changes
- • Camera & antenna system upgrades
Mechanical Subsystem
- • 6 post-PDR design improvements
- • FDM 3D printing (PETG/ABS)
- • Separation mechanism gears
- • Motor mount optimization
Smoke Capsules (Custom Mission 1)
- • Custom 3D-printed thermal-isolated design
- • KNO3 + Sugar pyrotechnic mixture
- • Electronic fuse activation circuit
- • 100% ignition reliability (10/10 tests)
Integration & Testing
- • 3-phase integration methodology
- • Environmental tests (drop, thermal, vibration)
- • Communication range validation
- • Mission operations planning
Project Management
- • 39/39 requirements compliance
- • Risk identification & mitigation
- • Team coordination (6 members)
- • Schedule & milestone tracking
Operation Control Officer
- • Pre-flight checklists & procedures
- • Real-time mission monitoring
- • GPS-guided recovery coordination
- • Post-flight data analysis
Technical Specifications
5-Layer Payload Architecture
Subsystem Highlights
Active Landing System
PID-controlled counter-rotating BLDC motors reduce descent velocity and provide 10-second altitude hold capability at 150m.
Kp=15.0, Ki=0.5, Kd=8.0
Target: 8-10 m/s descent
Motors cut @5m, 150s timeout, battery monitor
Custom Mission: Smoke Capsules
Custom-designed 3D-printed capsules with thermos-style double-wall thermal insulation, producing colored smoke visible from >500m.
60% KNO3 + 40% Sugar
+ dye + baking soda
~20s burn, >500m visibility
Exterior <40C
100% (10/10 tests)
Electric fuse, 100mA
Dual-Channel Communication
Primary (WiFi - Ch.1)
- • 2.412 GHz bidirectional
- • Telemetry + commands
- • TL-ANT2424B dish antenna
- • ~1 km range
Secondary (NRF24 - Ch.6)
- • 2.437 GHz (25 MHz separation)
- • Async 300KB video download
- • Telemetry relay
- • Bonus mission channel
Live Video
Foxeer Razer Mini (1200TVL) + Eachine DTX03 transmitter with automatic SD card recording. Received via Eachine ROTG01 FPV receiver.
Flight Software State Machine
State machine architecture with EEPROM persistence for power-loss recovery. Handles all mission phases autonomously.
- • YUKSELIS → DUSUS: Altitude decreasing
- • DUSUS → AYRILMA: Alt < 200m
- • EEPROM state persistence
- • KOMUT manual override mode
Ground Station & AI Object Detection
Ground Station (C# WPF)
- • Telemetry panel + graphs
- • GPS map (GMap.NET)
- • Live video feed
- • 3D model visualization (HelixToolkit)
- • Command buttons & manual control
Custom Mission 2: YOLOv4-tiny
- • Real-time object detection
- • RarePlanes dataset (630K images)
- • Aircraft detection class
- • ~10 FPS processing
- • Bounding box overlay
Team TALIA 4A
University: Fatih Sultan Mehmet University
Team ID: 405365 • Date: March 28, 2022
Access the Full Report
Download the complete Critical Design Review document with detailed technical specifications, CAD drawings, circuit diagrams, software architecture, and testing plans.
Download CDR Report (PDF)Team TALIA 4A • March 2022