SDR-BASED APRS TRACKER SDR-BASED APRS TRACKER INTRODUCTION What - - PowerPoint PPT Presentation

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SDR-BASED APRS TRACKER SDR-BASED APRS TRACKER INTRODUCTION What - - PowerPoint PPT Presentation

Feb 09, 2023 409 likes •537 views

EOSS PRESENTATION SDR-BASED APRS TRACKER SDR-BASED APRS TRACKER INTRODUCTION What APRS application to aid trackers in payload recovery Primary Features Software based (no traditional radios) Simultaneous reception of APRS packets

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SLIDE 1

SDR-BASED APRS TRACKER

EOSS PRESENTATION

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SLIDE 2

What

  • APRS application to aid trackers in payload recovery

Primary Features

  • Software based (no traditional radios)
  • Simultaneous reception of APRS packets on multiple frequencies
  • Offline maps
  • Landing predictions
  • Receive only, nothing is transmitted over the air or uploaded to the

Internet

  • Light weight user interface leverages a web browser

INTRODUCTION

SDR-BASED APRS TRACKER

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SLIDE 3

WHAT’S IN THE KIT

  • NooElec SDR (USB stick)
  • Kansung Computer
  • i5 Dual Core CPU
  • 8GB RAM
  • 500GB Hard Drive (mechanical)
  • AC-to-DC power supply
  • GPS Puck
  • 12v Pigtail Barrel Connector
  • 2 x USB Extension Cables (long and short)
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SLIDE 4

WHAT YOU NEED TO PROVIDE

  • 2m Antenna
  • Coax
  • Should terminate with SMA male
  • 12v Power
  • Power isolator/conditioner [optional]

IN THE VEHICLE*

* Note: Use the AC-to-DC power supply when at home.

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SLIDE 5

THE SCALE PROBLEM

Frequencies:

144.340MHz 144.905MHz 145.535MHz 145.645MHz 145.710MHz 145.765MHz Top Bottom

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Top Bottom

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Top Bottom

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Top Bottom

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Top Bottom

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SLIDE 6

Presentation Data Storage Data Acquisition

CORE CONCEPT

SDR-BASED APRS TRACKER

Database

APRS Packets

144.390MHz 144.340MHz 144.905MHz ...

APRS Packets

145.645MHz 145.710MHz 145.535MHz

  • ...

Graphical Interface

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SLIDE 7

BLOCK DIAGRAM

SDR-BASED APRS TRACKER

SDR GnuRadio Dire Wolf Aprsc

2m Antenna

Web Server

Database OpenStreetMap database and tile server

Web Clients

Web browser on device

  • f choice

(ex. tablet, laptop, phone) Clients:

  • TrackPoint
  • APRSISCE
  • YAAC
  • Xastir

APRS-IS

Read Only

  • Channelize
  • LP filter
  • FM demod
  • Downsample
  • Software TNC
  • 1200 baud
  • AFSK demod
  • Apache
  • SSL (https)
  • USB stick
  • 2MHz spectrum

width

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SLIDE 8

HOW TO CONNECT THINGS

2m Rx Antenna SDR USB Stick 12v Power GPS Puck EOSS-xx

IN THE VEHICLE

DC-DC

Automotive?

ON

1 2

Join Wifi Network https://eosstracker.local/

3

SMA Female

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SLIDE 9

DEMO

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SLIDE 10

BACKUP SLIDES

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SLIDE 11

HOW TO CONNECT THINGS

2m Rx Antenna SDR USB Stick GPS Puck EOSS-xx

AT HOME - GETTING PREDICT FILES

ON

1 2

Join Wifi Network https://eosstracker.local/ https://www.eoss.org/predict

3

SMA Female

Home Network

AC-DC

Power Brick