| UNAVCO
 


Knowledge Base

Power Draw Profile for a Trimble NetRS and Iridium System (polar)

Power Draw Profile for a Trimble NetRS and Iridium System

Test Summary

UNAVCO performed a benchtop test to record a high-resolution time history of power consumed by a Trimble NetRS GPS system with Iridium communications. The test system consisted of a Trimble NetRS receiver with Trimble Choke Ring antenna, NAL Research A3LA-I modem with SAF5350C antenna, Flexcharge NC30L12 solar regulator, and an ABB RS1A44 timer switch. This system represents the UNAVCO best-practices polar GPS station as of June 2006.

The test was performed at room temperature. A variable DC power supply was used to deliver 12.0 VDC to the battery input terminals on the power board, with current and voltage recorded at 10 Hz by a data acquisition computer running LabView. The data acquisition routine clipped the current burst signals above 1 amp (12 W) during Iridium data download, however this threshold was usually close to the true peak height of the ~0.1 second pulses. For longer duration, stronger bursts, a conservative visual estimation of the true peak height was made and used in calculating the power consumption during data download.

Test Sequence

  1. Power full system with 12.0 VDC.

  2. Allow components to boot up and assume steady-state operation.

  3. Disconnect Iridium modem for 1 minute.

  4. Reconnect Iridium modem and allow system to return to steady-state operation.

  5. Execute Iridium download script: call Iridium modem and download small GPS data file.

  6. Call was dropped.

  7. Iridium download script redials and second call is initiated. Call is user-terminated.

  8. Turn off entire system. Disconnect Iridium modem.

  9. Turn on system and allow system to reboot and assume steady-state operation (w/o Iridium).

  10. Disconnect power.

Results

  • The average power draw of the GPS receiver, timer switch, and solar regulator combined is 3.35 W.

  • If the Iridium modem is powered with no data download underway, the system average power draw is 4.15 W.

  • When a data download is underway, the average power draw is 6.25 W.

The measured power draw time series is presented in the figure below (right-click and select "View Image" for a larger view).


Attached Files
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Name
Email
Security Code Security Code
Related Articles RSS Feed
Polar Station NetRS Receiver and Iridium Modem Configuration
Viewed 4738 times since Tue, Oct 27, 2009
Power - Calculations for Solar Arrays and Battery Backup
Viewed 71011 times since Wed, Oct 31, 2012
Trimble NetR9 Power Consumption
Viewed 7261 times since Tue, Oct 4, 2011
GNSS Antenna Power Consumption Testing
Viewed 5279 times since Wed, Nov 26, 2014
Communications Hardware Used by UNAVCO in Polar Applications
Viewed 5598 times since Tue, Oct 27, 2009
Equipment Power Usage Testing
Viewed 8911 times since Sun, Mar 28, 2010
Leica GR10 Power Consumption
Viewed 7521 times since Tue, Oct 11, 2011
Power - Wind Power Testing at UNAVCO through 2005, Phase 3
Viewed 3662 times since Sat, Mar 27, 2010
Power - Wind Power Testing at UNAVCO through 2005, Phase 1
Viewed 3509 times since Sat, Mar 27, 2010
Javad Sigma Power Consumption
Viewed 6310 times since Wed, Oct 5, 2011
MENU

Last modified: Monday, 12-May-2014 00:18:29 UTC