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WELCOME. Atharva College of Engineering Mumbai. ATHARVA COLLEGE OF ENGINEERING. Ground-Station Team. Project Guide : Prof. Mrs. Archana Chaudhari Student Members: Aniruddha Khadye Anuj Tiwari Divya Acharya Nikhil Joshi Nirali Khandhar Saurabh Sanghai Swarnkamal Singh Parmar

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slide2
Atharva College of Engineering

Mumbai

ATHARVA COLLEGE OF ENGINEERING

slide3
Ground-Station Team

Project Guide:

Prof. Mrs. ArchanaChaudhari

Student Members:

Aniruddha Khadye

Anuj Tiwari

DivyaAcharya

Nikhil Joshi

NiraliKhandhar

Saurabh Sanghai

Swarnkamal Singh Parmar

Viral Shah

slide4
Project Objectives
  • To setup an autonomous Ground Station at ACE
  • To retrieve TEC data operating on 437 MHz and 145 MHz
  • To receive Satellite Beacon on 145 MHz using VHF receiver.
  • To receive Satellite Telemetry data on 437Mhz using OOK UHF receiver
  • To log and analyze the data received
  • Student Outreach Program
slide6
ACE Ground Station Break Up

Our Ground-Station consists of 3 main parts:

  • Antenna Array
  • Rotor Mechanism
  • Processing Circuit
slide7
Antenna

DESIGN:

  • Parameters obtained from 4nec2 software.
  • Design was for 5 element 145 MHz Yagi-Uda antenna is shown.
  • 5 elements Yagi-Uda was selected for:
  • Better directivity
  • Better sensitivity
  • Low Bandwidth
slide8
FABRICATION:
  • Antenna parameters obtained from NEC aren’t always practically realisable.
  • Values had to be rounded up to achievable margin and the resultant design was again simulated on the software.
  • Best possible parameters were selected based upon their practicality as well as fulfillment of specified criterion.
slide10
Balun
  • Balun is also known as Quarter Wave Transformer.
  • It is used for impedance matching.
  • Length of balun is 1\4th of wavelength.
  • Practically, this value has to divided by velocity factor of the medium so as to account for different velocity of signal in different medium.
slide11
Dipole Bending
  • Plane of polarization should be maintained while folding dipoles.
  • The distance between the folds of the dipoles have to be maintained.
  • For 437MHZ, a 7mm thick mild steel former was used.
  • For 145 MHz a 2 cm diameter wrought iron former was used.
  • Both these formers were customized in the ACE workshop.
slide12
Why LMR 400?

LMR 400

RG 214

Attenuation

8.57 dB/100m at 145 MHz

15.95 dB/100m at 437 MHz

Max Operating Temperature: 75 ˚C

Cost: INR 500/m

  • Attenuation:
    • 5 dB/100m at 145 MHz
    • 8.9 dB/100m at 437 MHz
  • Max Operating temperature: 85 ˚C
  • Cost: INR 85/m
slide13
Why Antenna Rotator?
  • Dynamic Az/El trackingis a necessity for precision in readings and to avoid errors.
  • Manual tracking is not practical given the short Satellite pass duration , strength of signal being received & weight of antenna setup.
  • Though designing a rotor system is an option but you will need to take care of many factors
      • Water Proofing Motor framing
      • Wiring & Insulation
      • Wind load Considerations
      • Most importantly ACCURACY!!

4-Crossed Yagi-Uda Rotator Setup

  • Options Available
    • Yaesu G5500
    • Hygain
    • Kenpro
slide14
Good option : YaesuG-5500
  • Specifications
  • Rotation Range:
      • Elevation: 180°0
      • Azimuth: 450°
  • Maximum Vertical Load
      • :Elevation: 30 kg or less
      • Azimuth:. (200 kg) or less
  • Rotation Time (Non Loaded)
      • :Elevation (180°): 67 sec at 60 Hz
      • Azimuth (360°): 58 sec at 60 Hz
  • Comes with a controller which helps in interfacing with a PC based tracking software
slide15
RCI-SE Board
  • Provides efficient control in both Azimuth and Elevation Planes
  • Compatible with most of the Antenna rotators available
  • This controller board takes care of all the Talking ! (Interfacing )between the PC –Software (Orbitron/Satscape ) and Antenna rotator(Yaesu G5500)
  • 5 relays (Azimuth and Elevation Control)
    • Left
    • Right
    • Up
    • Down
    • AUX, Brake or Speed control.

RCI-SE Controller

  • Specifications:
  • 5 Relays
  • 2 x 8 Bit ADCs
  • LPT Interface Port
slide16
Wouxunvs ADF

WOUXUN- KGUVD1P

ADF 7020

Sensitivity upto -118 dBm

No inbuilt LNA or BFO

VFO is not Field Programmable.

Delicate , requires ESD protection.

Powered by power supply.

External peripheral components required.

No license required.

  • Sensitivity upto -125 dBm
  • Inbuilt LNA & BFO.
  • Field Programmable VFO to offset satellite Doppler shift.
  • Rugged and Robust.
  • Powered by Li-ion battery.
  • Plug and play device.
  • Requires operating license
slide18
LNA ZX 60 33 LN+
  • Frequency 50- 3000Mhz
  • Noise figure; 1.1dB
  • Gain 20.5 dB
  • i/p VSWR 2:1
  • o/p VSWR 1.6:1
  • DC Supply Voltage 5V
  • Supply Current 70mA
  • Operating Temperature -40’C to 85’C
slide19
AD 8302
  • Polarization Measurement Kit (Phase and Gain Detector)
  • 2 Inputs from 1 Crossed Yagi
  • 2 Outputs to be given to µController
slide20
CC 1020
  • It is industrial grade Trans- receiver IC.
  • It is operational over a frequency band of 405MHz to 470 MHz and is tunable.
  • It’s power requirements are low (-118dbm) Signal received at Ground-station would be -110dbm.
  • It supports packet data transmission.
  • Maximum bit rate is 156.2 kbps which is much higher than our requirements.
slide21
Satellite Tracking Software

SATSCAPE:

  • Inbuilt WISP – DDE protocol to interface with compatible rotor system. (Yeasu G-5500)
  • Real time Tracking .
  • Built in Voice Alerts.
  • Wide range of satellites which can be tracked.
  • 3-D Graphic User Interface
  • It’s a FREEWARE !
slide22
Objectives Achieved
  • Crossed Yagi antenna successfully designed, fabricated & characterized.
  • Power link budget implemented.
  • CC 1020 and AD 8302 ordered and procured.
  • Ground-Station Control Room set up.
  • Softwares like 4NEC2, Solid Works, Satscape, Smart RF Studio were studied and used.
slide23
Experiments Conducted
  • AX.25 protocol studied using Slow Scan TV on commercial UHF Band .
  • Morse Code transmission/reception.
  • Radio Telescope was setup to monitor solar radiations.
  • Tracked ISS.
  • Radio propagation conditions were studied at the control room by setting up VHF/UHF monitoring station.
slide24
Student Outreach Program

ACE

  • Blog and Facebook profile was created to reach out to the students & interested people.
  • Blog:

http://acegroundstation.blogspot.com/

  • Facebook Profile Handle:

Ace Satellite Ground-Station

  • Student Interactive Session was conducted.
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