Prospectair's magnetic system consists of a single magnetometer mounted in a stable foil (bird) 20 meters below the helicopter. When flown by an experienced pilot, the towed bird technique provide very good resolution since the terrain can be followed very closely and, more importantly, because no compensation is required for helicopter movement.
Model | Geometrics G-822A Airborne High Sensitivity Magnetometer |
Operating principle | Self-oscillating split-beam Cesium Vapor (non-radioactive) |
Operating range | 20k – 100k nT |
In flight sensitivity | 0.05 nT |
Sampling rate | 30 Hz (approximately every 1 meter) |
Operating temperature | -35°C to +50°C |
Operating altitude | Up to 30 000 feet (9 000 m) |
Max tolerated Magnetic Diurnal | 25 nT in a straight-line chord over 5 minute |
Aerodynamic magnetometer noise | 0.5 nT |
Sensor terrain clearances | 60 – 100 feet (18.3 – 30.5 m) |
Model | Terra TRA3000/TRI-40 radar altimeter |
Operating range | 40 – 2 500 feet (12.2 – 762 m) |
Accuracy | 1 ft (0.3 m) |
Sampling rate | digital record of 1 Hz |
Model | Gem Systems GSM-19 |
Resolution | 0.01 nT |
Sampling rate | 0.5 Hz |
GPS | NOVATEL model PROPAK V-3 |
Real-time position accuracy | ± 2 m |
Sampling rate | 30 Hz |
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