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Polar Services - Remote Station Engineering - Instruments
Technical Notes
Sensor Instruments Currently Used By UNAVCO In Remote Polar Applications
GPS RECEIVERS
| Photo |
Manufacturer |
Part Number |
Description |
Status |
 |
Trimble |
NetRS Manufacturer specs [PDF] |
Reference station receiver, 3 year internal memory at 30s sample rate (1GB),
Linux based, L2C tracking, robust internet communications. See above link for power draw
information.
|
Operational since 2004. Deployed in:
-Antarctica and Greenland POLENET networks, using Iridium and point-to-point radio comms.
-Two Mt. Erebus sites (CONZ and MACZ) using point-to-point radio comms.
-EarthScope PBO network. |
GPS ANTENNAS
| Photo |
Manufacturer |
Part Number |
Description |
Status |
 |
Trimble |
GNSS Choke Ring 59800-00 Manufacturer specs |
Dorne-Margolin Choke Ring w/o radome, capable of tracking all GNSS constellations. Replaces old Trimble P/N 29659-00.
Weight: 10 lb
Cube: 0.5 (∅ 16"x6")
ANTENNA MODEL IS PROJECT-SPECIFIC. |
Well-characterized global standard antenna for geodetic measurements. Used in Earthscope PBO Network.
Deployed in Greenland and Antarctica for the POLENET project. |
 |
Southern California Earthquake Center |
SCIGN radome for Trimble Choke Ring Radome and supplier information |
Short or tall sizes. Available for different antennas.
Short Model:
Weight: 5 lbs
Cube: 1.5 (∅ 17"x10")
USE OF RADOME AND RADOME MODEL IS PROJECT-SPECIFIC. |
Legacy radome used in SCIGN, Earthscope PBO, and TAMDEF networks. Deployed in Greenland and Antarctica
for the POLENET project (short model). |
 |
Trimble |
Zephyr Geodetic 41249-00 Note: UNAVCO will likely begin using the Zephyr 2
GNSS antenna, but this antenna has not yet been tested. |
Cost effective, geodetic quality antenna.
ANTENNA MODEL IS PROJECT-SPECIFIC.
Weight: 5 lb
Cube: 0.5 (∅ 16"x4") |
Used in global Geodetic networks as well as selected geodetic sites in Antarctica.
Also used for Antarctic and Arctic glaciological applications. |
GPS ANTENNA ACCESSORIES
| Component |
Photo |
Manufacturer |
Part Number |
Description |
| External GPS Antenna Cable |
 |
RPC Manufacturing Solutions |
PPS-RF-006 revA (unsheathed)
PPS-RF-007 revA (sheathed) |
Custom length Times Microwave LMR-400 cable assembly
with Type N male crimp-on connectors. Right-angle connector used at GPS antenna, straight connector
used at enclosure. N-TNC adapter used for Zephyr Geodetic antenna. Typical lengths are 100 ft. or 50 ft. Can also be sheathed in flexible conduit
(e.g. McMaster-Carr 7581K42) for protection from wildlife. LMR-400 antenna cable tested flexible to -40C.
Weight (100 ft.):
5 lb unsheathed
15 lb sheathed
Cube (100 ft.):
0.5 unsheathed
1 sheathed |
| Internal GPS Antenna Cable |
 |
RPC Manufacturing Solutions |
PPS-RF-005 revC |
4 ft. cable assembly with Type N male crimp-on connectors. Connects GPS receiver
to bulkhead connector on enclosure wall. |
| GPS Antenna Bulkhead Connector |
 |
Pasternack |
PE9128 |
N-N thru bulkhead connector with O-ring seal and female contacts is pass-thru for comms antenna cable on enclosure wall. |
WEATHER STATIONS
| Photo |
Manufacturer |
Part Number |
Description |
Status |
 |
Vaisala |
WXT-520 WXT520AAB0BC10B0
Manufacturer specs [PDF] |
Versatile weather station: Pressure, Temperature, Humidity, Precipitation, Wind Speed and Direction.
No moving parts, custom-configurable. Internal heater is disabled to save power, rime ice can
interfere with ultrasonic wind speed data. Ultrasonic wind sensor also does not function below -45C. Use
with serial port surge protector (see Communications
section for part information). See Structural
section for mounting adatper for aluminum pipe frame.
UNAVCO recommends a low sampling rate (30 or 60 minutes) for met instruments to avoid potential problems
with the NetRS receiver due to memory usage. Average power draw is <0.05W. |
Easily integrated with Trimble NetRS GPS receiver, met data stream injected into GPS data files. Deployed
at multiple Antarctic locations. Simple and relatively low-cost, but only moderate survivability in polar conditions. |
Last modified Wednesday, 09-Dec-2009 04:30:44 UTC
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