RF Communications
Download
1 / 11

RF Communications Jonathan Parkhurst Space Sciences Laboratory University of California, Berkeley - PowerPoint PPT Presentation


  • 122 Views
  • Uploaded on

RF Communications Jonathan Parkhurst Space Sciences Laboratory University of California, Berkeley. RF Communications Agenda. AGENDA Requirements Communications Overview UHF (Low-Rate) System S-Band (High-Rate) System Patch Antenna Issues. RF Communications Requirements.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' RF Communications Jonathan Parkhurst Space Sciences Laboratory University of California, Berkeley' - lajos


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

RF Communications

Jonathan Parkhurst

Space Sciences Laboratory

University of California, Berkeley


Rf communications agenda
RF Communications Agenda

AGENDA

  • Requirements

  • Communications Overview

  • UHF (Low-Rate) System

  • S-Band (High-Rate) System

  • Patch Antenna Issues


Rf communications requirements
RF Communications Requirements

UHF Communications (low rate)

  • uplink telemetry commands

  • 1.2 kbps

  • S-Band Communications (high rate)

    • downlink science and telemetry data

    • 1Mbps

Circular Polarization


Rf communications overview
RF Communications Overview

Low-rate Command Link

UHF, 450 MHz,

FM, 1.2 kbps, No coding

High-rate Telemetry and Science Data Link

S-band, 2200-2290 MHz

FM, 1 Mbps, Reed-Solomon coding

CINEMA

BGS Helix Antenna

BGS 11m Antenna

MOC at UCB/SSL


Low rate uhf uplink
Low-Rate UHF Uplink

AstroDev He-100 radio

Operating Frequency: 450 MHz

Data Rate: 1200 bps(max)

Power Usage (RCVR) < 200 mW

Receiver Sensitivity: -104.7dBm, for a

bit error rate of 10E-3


Uhf antennas on the satellite
UHF Antennas on the Satellite

~16.7 cm (1/4 wavelength)

deployed after the sat

is in orbit


High rate s band downlink
High-Rate S-Band Downlink

Emhiser Digital Transmitter

Model Number EDTC -09E1A502-00


High rate s band downlink cont
High-Rate S-Band Downlink (cont)

Emhiser Digital Transmitter

Model Number EDTC -09E1A502-00

Frequency Range: 2200.5 - 2299.5 MHz

Input Voltage: +12 VDC

Temperature Operating Range: -20 C - +70 C

Size: 3.5” x 2.5” x 1.0”

Output Power: 5 W

Bit Rate: 1 Mbps


S band patch antennas
S-Band Patch Antennas

Solar

Patch

Panel

Antennas

  • PC board material separating

  • two copper plates

  • Dimensions a, b, x’, y’ adjusted

  • to give antenna characteristics


Antenna development plan
Antenna Development Plan

  • Analytical estimations to determine directivity,

  • input impedance, degree of polarization, and

  • resonant frequency (iterative process)

  • Network Analyzer

  • Anechoic Box / Anechoic Chamber (UCSF)

  • Far-field testing using 11m dish



ad