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The Geometrics high sensitivity Cesium Vapor Magnetometer model G-858  MagMapper has been integrated with the Trimble ag114 GPS for single man-carry operation.  This superb duo provides unprecedented ability to perform magnetometer surveys without prior layout of the survey grid, saving substantial time, effort and money.

Trimble Navigation, in conjunction with Geometrics, has produced the first commercially available nonmagnetic Differential GPS receiver for close-in magnetometer use.  The modified ag114-GPS is essentially an agricultural product that uses subscription-based private differential correction services to calculate sub-meter positions in real-time.  Steering information to allowing users to survey on a predetermined grid is accomplished using the Parallel Swathing Option Lightbar. We have adapted this technology to provide sub-meter navigation and position fix of magnetometer survey data in real time. 

Our MagMap96 data processing software then uploads the combined data from the magnetometer and linearly interpolates the positions, providing each magnetometer reading with its own Lat/Long or UTM coordinate location.  Subsequent plotting and analysis of the data with  geographical coordinate system is then provided by both MagMap96 and Surfer for Windows from Golden.

Differential Corrections are supplied by either the Racal or Omnistar satellite system, allowing  operation at most latitudes without the use of a basestation or  radio link!   This frees the operator from annoying loss of differential correction due to radio link dropouts caused by line of site interference.

The primary applications for this technology are environmental survey and mining exploration programs.  Because of the requirement for centimeter accuracy for some applications (such as archeology and UXO/EOD surveys) it may not be suitable for all operations.  Nevertheless, it represents an easy upgrade path for  existing and new G-858 users who wish to expand their survey capabilities and minimize costs.

Features:
  • Lightweight Non-magnetic Backpack with      sensor/antenna poles & battery tray
  • VERY HIGH SENSITIVITY - 0.004 nT/ûHz RMS and       
  •   HIGH ACCURACY  - <1m rms 
  • Removes the need for laying out lines  and surveying grid prior to survey  - Saves time and money!

Specifications:

MAGNETOMETER

Operating Principle:Self-oscillating split-beam Cesium Vapor (non-radioactive)

Operating Range:20,000 to 100,000 nT

Operating Zones:The earth's field vector should be at an angle greater than 6ø from the sensor's equator and greater than 6ø  away from the sensor's long axis.  Automatic hemisphere switching.

Sensitivity:<0.008 nT/ûHz rms.  Typically 0.05 nT P-P at a 0.1 second or 0.005 nT at 1 second sample rate.

Heading Error:  ñ1.0 nT (over entire 360ø spin and tumble)

Absolute Accuracy:<2 nT throughout range

Output:RS-232 at 9600 Baud

Mechanical:Non-Magnetic all aluminum backpack with battery tray. Total weight with mag, GPS and batteries is 35 lbs.

Power:24 to 32 VDC, 0.75 amp at turn-on and 0.5 amp thereafter, with GPS is additional 0,75 amp, or three hours  operation per pack.

 

AG132 DGPS

Receiver:Integrated 12-channel receiver/dual-channel MF differential beacon receiver/satellite differential  receiver

Differential Correction:Built-in virtual reference station (VRS) ensures satellite differential correction uniformity. RTCM SC-104 and NMEA-0183 differential     correction input

Weight:0.76kg (1.68 lb)

Size:14.5cm W x 5.1cm H x 19.5cm D (5.7"W x 2.0"H x 7.7" D)

Accessories

Standard:MagMap96 Utility Software,  operation manual and ship  case

Optional:Expanded capacity Battery Packs, Surfer for Windows
[Land] [MagCarts] [G-858] [G-856] [AG114] [859]