Introduction » History » Version 4
AUGER, Anne sophie, 03/23/2015 09:43 AM
| 1 | 1 | AUGER, Anne sophie | h1. Introduction |
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| 3 | 3 | AUGER, Anne sophie | The aim of this project is the design study of a Telemetry and Telecommand (TM/TC) link between small aircrafts (ie TB20) and an antenna on top of ISAE building. There are different aspects in this work: |
| 4 | 3 | AUGER, Anne sophie | * regulatory aspects : we must find a frequency band, either license-free or requiering rights of emission |
| 5 | 1 | AUGER, Anne sophie | * link budget aspects : some parameters can be adjusted to reach the wanted performance |
| 6 | 1 | AUGER, Anne sophie | * flight constraints have to be considered in the choice of the equipment to allow a full time link |
| 7 | 1 | AUGER, Anne sophie | |
| 8 | 2 | AUGER, Anne sophie | p=. !Slide1.jpeg! |
| 9 | 1 | AUGER, Anne sophie | |
| 10 | 1 | AUGER, Anne sophie | To summarize the system design constraints, we can fill the mission statement below: |
| 11 | 1 | AUGER, Anne sophie | |
| 12 | 2 | AUGER, Anne sophie | p=. !cahier_des_charges.png! |
| 13 | 1 | AUGER, Anne sophie | |
| 14 | 1 | AUGER, Anne sophie | In order to define the video bit rate required for our application, knowing the aspect ratio (AR=1,78) quality of the encoded video (L=720p) and its frame cadence (FPS=12), we used the following formula: |
| 15 | 1 | AUGER, Anne sophie | |
| 16 | 1 | AUGER, Anne sophie | p=. Bit rate = FPS*5,0692 * L ^1,391^ /(1000*AR) |
| 17 | 1 | AUGER, Anne sophie | |
| 18 | 1 | AUGER, Anne sophie | So |
| 19 | 1 | AUGER, Anne sophie | |
| 20 | 1 | AUGER, Anne sophie | p=. *Bit rate=322 Kbps* |
| 21 | 1 | AUGER, Anne sophie | |
| 22 | 4 | AUGER, Anne sophie | As the link will allow video transmission, we will need an adapted encapsulation protocol, so we must take into account extra bits: we decide to define a bit rate of 500 kbps. |