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Attention:

Magnetic compensation flight procedures are required after each new installation of the magnetic sensors.

Summary

Magnetic measurements provide the direction of the geomagnetic field. Therefore, 2 Cesium Magnetometers are mounted in a nose boom and a tail boom. In addition, a Fluxgate Magnetometer for attitude compensation is installed. The sensor system is controlled by an external unit (AADC II) mounted in a rack. Magnetic base stations with Overhauser magnetometers are used for ground reference of the airborne measurements.

Sensor-Info: aircraft:bt-67:magnetics, 6815


Manufacturer RMS Instruments, Scintrex Ltd., RMS Instruments
Model see subdevices
Serial No. n/a
Type magnetometer

Contacts

Name Institution Role
Graeme Eagles Alfred-Wegener Institute of Polar and Marine Research Device Contact

Available devices and Specifications

Name Model Serial Number
Automatic Aeromagnetic Digital Compensator AADCII 9903860
Cesium Magnetometer CS-3 9511042
Cesium Magnetometer CS-3 9503008
Cesium Magnetometer CS-3 9810135
Cesium Magnetometer CS-3 9808131
Cesium Magnetometer CS-3 1203404
Fluxgate Magnetometer TFM100G1E 110
Fluxgate Magnetometer TFM100G1E 999
Overhauser Magnetometer GSM-19 GSM-19 52498
Overhauser Magnetometer GSM-19 GSM-19 62673

Specifications of RMS Compensator AADC II (without mounting)

Dimension Compensator (L x W x H)

483 x 440 x 178 mm

Weight

12.5 kg

Power Supply

28 VDC

Data interface

serial interface (RS-232)


Specifications of CS-3 Scintrex Cesium Magnetometers (without mounting)

The CS-3 magnetometers are installed at the tips of the noseboom and the tailboom. Length of the noseboom from the tip of the aircraft is about 3.3 m.

Dimension Sensor Head (Diameter x L)

63 x 160 mm

Weight

1.15 kg

Dimension Sensor Electronics (Diameter x L

63 x 350 mm

Weight

1.5 kg

Power Supply

24 - 35 VDC


Specifications of Billingsley Fluxgate Magnetometer (without mounting)

Dimension Fluxgate (L x W x H)

83 x 35 x 32 mm

Weight

0.1 kg

Power Supply

15 - 34 VDC

Data interface

serial interface (RS-232)


Specifications of GEM Overhauser Magnetometer

Dimension Sensor (Diameter x L)

75 x 175 mm

Weight Sensor

1.0 kg

Dimension Console (L x W x H)

223 x 240 x 69 mm

Weight Sensor

2.1 kg

Data interface

serial interface (RS-232)


Position

CS-3 Cesium Magnetometers are mounted in a tail and a nose boom respectively. Additionally, a fluxgate magnetometer is mounted close to the aileron. Electronics are stored in a rack.

Data logging, storage and archiving

Logged parameter

Parameter Sensor Output Type Unit
magnetic field compensated magnetic field nT
magnetic field raw magnetic field nT
magnetic field uncompensated magnetic field nT
magnetic field total magnetic field nT
magnetic field x-component magnetic field nT
magnetic field y-component magnetic field nT
magnetic field z-component magnetic field nT

Rawdata storage on board

During flight magnetometer data are stored within the aircraft onboard DMS system. Magnetic base stations record data independantly and continously.

Data archiving on land

After the flight CS-3 and Fluxgate magnetometer data are accessible via the land system of the aircraft data managment system (DMS). Base station data of the GEM Overhauser magnetometers are downloaded frequently and are made accessible via the external devices file system of the aircraft data managment system (DMS).

DMS

Module name

B707 Magnetic

Device name

Magnetic

Parameters

4DIF(F) front [nT]; 4DIF(R) rear [nT]; Compensated grad 1 [nT]; Compensated mag front [nT]; Compensated mag rear [nT]; Error code; ErrorText; Magnetic ASCII; Mode code; Scan Number [0.1 s]; Status; Total field (Fluxgate) [nT]; Uncompensated grad 1 [nT]; Uncompensated mag front [nT]; Uncompensated mag rear [nT]; X-component (Fluxgate) [nT]; Y-component (Fluxgate) [nT]; Z-component (Fluxgate) [nT]


Documentation



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