Javad Prego, Operator'S Manual

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4-6 Prego Operator’s Manual www.javad.com
O P E R A T I O N
Using the MinPad
4
Normal
In normal mode, the STAT LED indicates the number of tracked
satellites and the position computation status.
Extended Information Mode (EIM)
Extended Information Mode is used for receiver testing purposes. In
this mode, the receiver continues to work as usual, but the STAT LED
indicates the following “extended” information:
• Delimiter – An easily distinguishable double-blink that shows the
overall status of tests performed in EIM. Its color is calculated from
colors of other blinks. It is orange if at least one of blinks is orange.
It is red if no other blinks are orange and there is at least one red
blink. It is green in all other cases.
• Enough data for position computation.
• GPS S/N (signal to noise) ratio is good (see
Table 4-2).
• GLONASS S/N ratio is good (see Table 4-2).
• Oscillator frequency offset is not more than 3 ppm.
• Oscillator's Allan Variance is better than 2.7e-10.
• Continuous tracking time is more than 15 minutes.
Table 4-2. Signal-to-Noise (S/N) “Good” Ratios
CA/L1 P/L1 P/L2
GPS 51 39 39
GLONASS 51 49 40