Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991


Antennas operated by the ASF Satellite-Tracking Ground Station

AS3: 11-Meter Antenna, 2013

RGS 11-Meter Features

  • Tracker is command uplink capable
  • Computerized, full hands-off pass support capability
  • Latitude: 64.858875394, WGS 84_G1674
  • Longitude: -147.854115119, WGS 84_G1674
  • Elevation at feed 670 ft msl
  • 11m aperture, Cassegrain feed with S-Band feed at prime focus, X-Band feed at Cassegrain focus
  • 8400 three-axis pedestal with 7 deg third axis
  • L-3 Datron antenna control assembly

X-Band Receiving System

  • X-Band telemetry system G/T – 35.4 dB/deg K
  • Three independent, separately-tuned data channels
  • RHC & LHC selectable for all data channels
  • Freq Range 7600-8500 MHz (in 100 KHz increments)
  • Zodiac Data Systems Cortex Multi Mission High Rate Data Receiver with selectable data rates
  • Tracking channel, Single-Channel Monopulse autotrack mode

S-Band Receiving System

  • S-Band telemetry system G/T - 21 dB/deg K
  • Three independent, separately-tuned data channels
  • Freq Range 2200-2400 MHz
  • Zodiac Data Systems Cortex Multi Mission Low Rate Data Receiver with selectable data rates
  • Tracking channel, Single-Channel Monopulse autotrack mode

S-Band Command System

  • RGS 11m S-Band Uplink System
  • Freq Range 2025-2120 MHz
  • Power range 50 to 300 watts
  • Modulation:  
         Transmit Data - 2kbps data BPSK on a 16 kHz subcarrier, linearly PM on uplink
         Transmit Ranging - 1.7 MHz subcarrier summer with data

Satellite Tracking Data System

  • Wallops Turret System

Digital Recording Capability

  • Fully automated, hands-off, capture to disk for all X- and S-Band data
  • Programmable Telemetry Processor (PTP) providing direct capture to disk for S-band downlink

AS1: 11-Meter Antenna, 1995

RGS 11.28-Meter Features

  • Latitude: 64.858712150, WGS 84_G1674
  • Longitude: -147.857595161, WGS 84_G1674
  • Elevation at feed 672 ft msl
  • 11.28m aperture, Cassegrain feed with S-Band feed at prime focus, X-Band feed at Cassegrain focus
  • 3316 three-axis pedestal with 7 deg train axis
  • 3860 antenna controller
  • Computerized, full hands-off pass support capability
  • Tracker command uplink capability has been installed

X-Band Receiving System

  • X-Band telemetry system G/T - 34 dB/deg K
  • Three independent, separately tuned data channels
  • RHC & LHC selectable for all data channels
  • Freq Range 8000-8500 MHz (in 100 KHz increments)
  • Zodiac Data Systems Cortex Multi Mission High Rate Data Receiver with selectable data rates
  • Tracking channel, pseudo-monopulse autotrack mode

S-Band Receiving System

  • S-Band telemetry system G/T - 22 dB/deg K
  • Three independent, separately-tuned data channels
  • Freq Range 2200-2400 MHz
  • Zodiac Data Systems Cortex Multi Mission Low Rate Data Receiver with selectable data rates
  • Tracking channel, E-Scan autotrack mode

S-Band Command System

  • RGS 11m S-Band Uplink System
  • Freq Range 2025-2120 MHz
  • Power range 50 to 200 watts
  • Modulation:
    Transmit Data - 2kbps data BPSK on a 16 kHz subcarrier, linearly PM on uplink
    Transmit Ranging - 1.7 MHz subcarrier summer with data

Satellite Tracking Data System

  • 2209 Tracking Data Formatter (TDF)
  • 7701 Carrier Doppler Measurement System (CDMS)

Digital Recording Capability

  • Fully automated, hands-off, capture to disk for all X- and S-Band data
  • Programmable Telemetry Processor (PTP) providing direct capture to disk for S-band downlink

AS2, 9.1-Meter Antenna, 2017

RGS 9.1-Meter Features

  • Computerized, full hands-off pass support capability
  • S-Band uplink; S-Band and X-Band downlink
  • 9.1m aperture, Cassegrain feed with S-Band feed at prime focus, X-Band feed at Cassegrain focus
  • 3440 three-axis pedestal with 2.5 deg tilt axis
  • Latitude: 64.859460942, WGS 84_G1674
  • Longitude: -147.849742331, WGS 84_G1674
  • Elevation at feed - 758 ft msl
  • AC4100 antenna controller

X-Band Receiving System

  • X-Band telemetry system G/T - 32 dB/deg K
  • RHCP & LHCP selectable for all data channels as a group
  • Freq Range 8025-8400 MHz
  • QPSK/UQPSK
  • Bit synch/Signal conditioner support for:
    • 105 Mbps QPSK [ERS-2 & RSAT]
    • 100 Mbps QPSK [Envisat]
    • 85 Mbps QPSK [RSAT]
    • 60 Mbps QPSK
    • 6 Mbps QPSK
  • Tracking channel, pseudo-monopulse autotrack mode
  • Cortex Multi Mission High Rate Data Receiver

S-Band Receiving System

  • S-Band G/T - 21 dB/deg K
  • S-Band EIRP - 57.3 dBW
  • Dual-polarization supporting data and track channel
  • Freq Range 2200-2400 MHz
  • Demods for AM, PM, FM, & BPSK
  • QPSK/UQPSK
  • Data Rates - 10 kbps to 4 Mbps BIO-L
  • 10kbps to 8 Mbps NRZ-L

Digital Recording Capability

  • Fully automated, hands-off, capture to disk for all X-band and S-band data
  • Sony ID-1, High density Digital Recorder available for X-band data
  • Direct Capture System (DCS) 4 channel direct capture to disk up to 150 Mbps
  • Programmable Telemetry Processor (PTP) providing direct capture to disk for S-band downlink

Get SAR Data

Get SAR Data

Select and download SAR data online using Vertex.

Use the ASF API for downloading SAR data via a command line.