Time domain electromagnetic induction (Multi Period Sensing – Bi-Polar)
Magnetic Influence Mine resistant
4. Major Components
Control Box - new ruggedised MkII electronics and connectors
Sensor Head:
STMR - Sensor Head (complete with integral carrier, mounting points and Transmit (TX) cable). Width determines number of individual Receive (RX) coils.
Power and Auxiliary Connectors
PC based Display Software
Operation and Software Protocol Manuals
Threshold based Marking System Trigger controlled by PC application
Physical Data
5. Sensor Head
Type
Mono-loop RX
Line Replaceable Units (LRUs) are individual RX modules
Transmit (TX) coil and cable are incorporated in Sensor Head support structure
Dimensions
Small head, 2100x400x320mm (outside dimensions)
Large head, 3500x400x320mm (outside dimensions)
Note: Dimensions above include Carrier structure
Weight
Approx. 30 kg (2100 unit)
Approx. 50 kg (3500 unit)
Housing Material
Fibreglass and Hollow Core Polypropylene – “Space Frame”
Colour
US FED STAN 595B 33446 - "Desert TAN 686"
6. Receive (RX) Coils
Type
Two Monoloop Coils per RX module (= 2 streams of data per Rx module)
Separate RX modules
Dimensions
400x280x30mm per RX module (outside dimensions)
Max Coils
10 RX modules (=20 individual Rx coils in regards to resolution)
(The large 3500mm head is required for the maximum 10 x Rx modules )
Weight
1.26 kg per Rx coil (includes two mono-loop windings and a common cable and connector)
Material
ABS RX Coil Housing with foam inserts
Colour
Black or white
7. Control Box
Type
6U EDAK Mil Spec Enclosure
Dimensions
535x500x350mm (with transport cover in place)
535x435x350mm (in operation)
Weight
Approx. 25 kg
Colour
US FED STAN 595B 33446 - "Desert TAN 686"
8. Cable length
Max (std) length: 6 m
Functional Characteristics
9. Power
24VDC, 5A (max)
10. Operating Frequency
1.25 kHz +/-3% PRF, 6 pulses per cycle
11. Transmit Power
450V, 15A (peak)
12. Data Link
100 MB/s Ethernet to host PC (or any system capable of TCP/IP communication).
13. Assembly
Modular PCB design - Fast, simple field replacement of major components
System Protection
14. Power Supplies
Protection against input voltage transients as per ISO7637
Will only operate when battery voltage within specified safe limits of approx 20V to 30V.
Overload of internal voltage rail will initiate shutdown of both power supplies to prevent overheating.
Overload indicated to user by flashing the ‘Power IN’ LED on front panel.
15. Transmitter
Protection against intentional and unintentional Power up and Power down occurrences without damage to transmitter
Over-current triggers immediate TX shutdown.
Protection against noise induced timing errors
16. Recovery
Protection against intentional and unintentional Power up and Power down occurrences without damage to transmitter
17. Wiring Interconnections
All critical timing wiring connections continually checked for valid connection. Any connection error prevents TX enabling, or initiates immediate TX shutdown.
Similar to F1A4 operating independently for each RX coil.
Selectable modes:
Off,
Fixed (locks in the current settings)
Tracking (continually monitors and updates settings)
Noise Cancel
Searches ±3% about the nominal operating frequency for quietest operating point.
Drift compensation
Selectable AC, DC and Pseudo DC modes for drift compensation.
21. Positioning
GPS
Updates the data with the NMEA time stamp every 1 sec (±0.5ms)
Latitude and Longitude can be added to data for reference, updated every 1 sec.
Road Wheel (accessory)
System has ability to interface to Quadrature encoder and include data in output stream.
Processes the quadrature signals so direction can be inferred.
Distance data is passed inside data packets to host application and can be linked to display. Display scrolls at same rate as road wheel tics.
Note: Calibration method required
22. Output Format
Data packets output from the Ethernet connection include the following:
Time stamp (hh:mm:ss)
Distance (road wheel, ticks)
Status for each sensor slot
3 unprocessed data channels for each Rx coil (G, S, C)
Note: S & C are ground compensated channels.
Note: G is a raw data channel.
Minelab provides a PC application that controls the array, displays real time data, records data and replays collected data.
The log data is available in XML format.
Automatic Target Recognition
23.Detection
Detection for marking purposes is available.
Signals exceeding a preset threshold (operator adjustable in the application software) will generate a trigger for the marking system via the COM port of the PC running the ‘water fall’ display.
Channel drift tracking is provided by selectable modes of coupling (AC, pseudo DC, constant DC).
Environmental Standards
24. Humidity
Operating
10% to 90% RH (MIL-STD-810F-507.4)
Storage
0% to 100% RH (MIL-STD-810F-507.4)
25. Temperature
Operational
-30oC to +60oC (MIL-STD-810F-502.4/501.4 Procedure I & II)
Storage
40oC to +80oC (MIL-STD-810F-501.4/502.4 Procedure I & II)
Temperature Change
System will withstand sudden temp change (greater than 10oC per minute) within low and high storage temperatures. (MIL-STD-810F-503.4 Procedure I)
26. Moisture
IP65 (cables exempt when not connected to mating receptacles) (MIL-STD-810F-506.4 Procedure I)
27. UV Resistance
1 year visually and 5 years mechanically
28. Chemical Resistance
Withstands, without surface damage, short term exposure to:
Detergent
Vehicle fuels and lubricants
Note: Slight surface discolouration after short term exposure to fuels is possible.
Ground vehicle (MIL-STD-810F-514.5 Procedure I & III)
Detection Capabilities
30. Max recommended vehicle speed
Tested at 15 km/hr (currently limited by the fastest filter and maximum sample rate)
Sampling at 200Hz at 15kph gives a resolution of 2.1samples / cm.
Significantly faster speeds are possible with a degradation of signal to noise ratio trade-off
31. Sensor Head Height
50mm minimum ground clearance
up to 500mm above surface (if near-surface AT mine threat)
32. Max Detection Depth
Minimum Metal Anti Personal Mine Detonator
(NVESD Io Target)
220mm (below array)
DSTO Anti Tank Mine simulant (metal case)
1600 mm (below array)
Note: There are selectable Rx timings for optimisation of detection depth with respect to varying target characteristics. The same Tx timing is used for all Rx timings
33. Ground
Suitable for use in all soils with minimal reduction in sensitivity.
Technology as used in the Minelab F1A4 hand-held detector
34. Cross Track Resolution
Approx +/- 100 mm
Display Software
35. System
MS Windows 2000/XP
36. Real Time Display
“Waterfall” display of all Rx channels with optional marking overlay.
Data from max 20 Channels is logged for customer processing and displayed.
2D or 3D line plots of nominated Rx channels available.
37. Software Functions
Configure Array
At start up, parameters are read from a file on the controller.
Control Array
Commands are sent via the TCP/IP link to control:
Data logging
Noise cancel
Coupling
LPF
GB mode
Sampling rate
Rx timings
Distance reset
Shut down.
Real Time Display
As in 37 above, linked to distance from road wheel.
Log Array Data
Time stamp; distance; and{G, S, C, Q} channels
Replay logged files
Allows application of post processing algorithms
System Diagnostics
Subsystems are continually verified.
Power Supply monitors voltage rails, state, control lines, GPS connectivity and temperature.
There is no automatic self test of actual detection operation: a manual test with a metallic object is specified to test coil sequencing and signals.
Marking System
Manual prompting is from the waterfall display of all the Rx channels.
There are facilities available that automatically send a trigger out on the COM port of the host.
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