Javad JNSGyro-4T, Operator'S Manual

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4-6 JNSGyro-4T Operator’s Manual www.javad.com
O P E R A T I O N
Using MinPad
4
Information Modes
The JNSGyro-4T system has two information modes: Normal and Extended
Information Mode (EIM).
Normal
In normal mode, the STAT LED of each board indicates the number of
tracked satellites and the position's computation status.
Extended Information Mode (EIM)
Extended Information Mode is used for JNSGyro-4T testing purposes.
In this mode, the system 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. The STAT LED color for
delimiter is calculated from the colors of other STAT LED blinks.
–Orange: at least one blink is orange.
–Red: no orange blink and at least one red blink.
–Green: all other cases.
• Sufficient data for position computation.
• GPS S/N ratios are good (Table 4-2).
• GLONASS S/N ratios are good (Table 4-2).
• Oscillator's frequency offset is less than three ppm.
• Oscillator's Allan Variance is better than 2.7e-10.
• Continuous tracking time is more than 15 minutes.
In EIM, the STAT LED blinks seven times per cycle. Each blink could
be orange, red, or green.
• Orange – information for test unavailable.
• Green – system passed the test.
Table 4-2. Signal-to-Noise (S/N) «Good» Ratios
CA/L1 P/L1 P/L2
GPS 51 39 39
GLONASS 51 49 40