GSBC

ReHAB-150 II – Küldetés részletei


The mission has three main objectives, one measurement and two test exercise. The main test objective is the flight of the new improved flight computer. We are also planned to measure some environmental values during flight.


Test of the Improved Telemetry System

In the previous test flight development tools were used. These will be replaced with the first version of the telemetry system built by the UPRA FormFactor. The OBC and th COM are built almost the same components tested in the previous fligth and also a Measurement and Data Acquisition card will be used.

UPRA

The modules of the flight computer are built on seperate cards. They all have a 40pin connector for the system bus. The size of this form factor is determined not only to use in ReHAB-150 probe but in the smaller ReHAB-100 concept too.

  • Size of a module: 75x70mm (2.95×2.75 in)
  • Connector: 2×20 pin stacktrough pin header
  • Fastening: 3xM3 holes

OBC

The On-Board Computer (OBC) is based on an STM32F4 AMR cortex microcontroller. The OBC organizes the communication between the modules, collects house-keeping and GPS data and also compiles the telemetry packets.

System events are logged and can be downloaded from the SD card of the OBC. The House-keeping data is also stored on the SD card.

COM

Our Communication Unit (COM) is based on the Silicon Laboratories SI4461 FSK transceiver chip. It can be configurated for the desired frequency, data rate, deviation and modulation.

A different microcontroller will be used than in the first flight which has better performance and has all the preipherals needed.

In this flight we also like to cooperate with the amateur radio community so the parameters and formats of the communication will be chosen for these criteria.

SNW

 

Last time the Measurement and Data Aquistion Unit (SNW – SensorNetWork) didn’t fly. The funciton of the SNW is to collect and preprocess the sensor data. It also has an SD Card for storing the raw sensor data. After recovery the resolution of the measurement could be improved with this raw data.

EPS

 

During the GSBC flight the electrical power will be provided by alkaline non-rechargable batteries. The Electronic Power System (EPS) that provides the stable voltage is the same circuit as used in the previous fligth but manufactured by the UPRA FormFactor for better fitting.


Taking Pictures

In this flight photoshooting will take a big place again. There will be two cameras on board the balloon. One of them is the integrated small resolution module with 180° angle of view, the other is a high resolution wide angle external unit.

Integrated Camera System

The telemetry system has an integrated small resolution CMOS camera module that stores pictures on the SD card of the OBC. The pictures taken by the Integrated Camera System (ICS) are available for every unit of the UPRA system thus the pictures taken could be sent back via the Communication Module during flight.

The Integrated Camera System was tested before and now it is upgraded with a fish-eye lens of a 180° angle of view.

 

Specification:

  • Resolution: 320×200
  • Color: yes
  • Native angle of view: 65°
  • Modified angle of view: 180°
  • Picture format: BMP
  • Connection: Integrated (DCMI)

External Camera System

The probe will also have a standalone high-resolution camera that has its own storage and standalone power supply. The pictures taken by the External Camera System will only be available after the recovery of the capsule. The camera will be monitored by the OBC. The system is designed to not only trigger the shutter but to be able to modify some configurations on the camera too.

The only connection between the telemetry system and the External Camera System (ECS) is the control line, but the camera has its own power supply and storage to be independent from the flight computer. Because the ECS is a secondary module this independece provides more reliablity for the whole system.

Specifications:

  • Resolution: 1280×1024
  • Color: yes
  • Native angle of view: 65°
  • Modified angle of view: 120°
  • Picture format: JPEG
  • Connection: external attachment (OBC-GPIO)

Measure of Environmental Values

 

During the flight in addition to the internal house-keeping data the external environmental parameters will be also measured. These measurements not only important as meteorological data but they will help us to improve our system for the future flights. Collecting external environmental data, better insulation, more precise simulations and test environment could be built. Also we could make our atmosphere model more accurete.

Measured parameters:

  • Temperature
  • Pressure
  • Humidity

The processing of the collected data will be helped by the visual data collected by the cameras so it could be determined if the balloon flown into a cloud or got into the shadow of a cloud.