Proxim RangeLAN2 7920 Manual de usuario descargar pdf (Pagina 24)

II. OPERATIONAL SPECIFICATIONS

A. COMMUNICATIONS RANGE

An operational test of the communications range of the SMART robot showed

satisfactory results when compared to the advertised range of the Ethernet modems

employed. In an operational test at the Navy beach in Monterey CA generated a line of

sight communications range of over 200m. When the robot was driven over a hill beyond

the line of sight communications was lost at a range of 150m. Further tests at the NPS

softball field showed a line of sight communications range of over 100m and additional

testing will be completed to determine the actual maximum range.

B. ENDURANCE

Run time operational tests were performed to determine the endurance of the

SMART platform with its current battery configuration. The communications system

and the microprocessor are powered by a single 12-volt 3.0 AH battery and the endurance

in operational tests was three to four hours. A 6-volt 1.3AH battery powers the compass

and GPS cards and the endurance for the power supply was tested to be over 4 hours.

The motors for the SMART robot are powered by a 12-volt battery that will last 2-4

hours depending on the terrain and operational tempo. Field operational tests were

limited by the battery endurance of the laptop computer, which limited field operations to

approximately 2-3 hours.

C. HEADING ACCURACY

As a check of the heading accuracy of the compass guidance functionality of the

SMART platform two tests were completed. The first test was a swing-check of the

compass conducted with the robot under static conditions in a controlled environment. A

reference line of 000° magnetic was placed on the classroom floor and compass rose

points were drawn in reference to this mark. The direction of magnetic north was

determined with a generic magnetic compass. The robot was then aligned with the points

and the readout from the onboard magnetic compass was read with the motors off and

operating in all combinations. Results are specified in Table 1, and reflect an accuracy of

±7°.

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Proxim RangeLAN2 7920 Manual de usuario Pagina 24