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


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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.

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RF Communications Jonathan Parkhurst Space Sciences Laboratory University of California, Berkeley

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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

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

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

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

~16.7 cm (1/4 wavelength)

deployed after the sat

is in orbit


High-Rate S-Band Downlink

Emhiser Digital Transmitter

Model Number EDTC -09E1A502-00


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

Solar

Patch

Panel

Antennas

  • PC board material separating

  • two copper plates

  • Dimensions a, b, x’, y’ adjusted

  • to give antenna characteristics


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


Anechoic Box


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