DR + GPS
STARTER KIT REFERENCE MANUAL
Lassen DR + GPS Reference Manual 124
Antenna short detected.
Condition cause: Hardware failure.
Effect before Action: No GPS positions.
Soft Event Detected: Hardware signal queried at one Hz.
Soft Event Cleared: Hardware signal queried at one Hz.
Action: DR functions without GPS positions.
Failure to connect to GPS DSP.
Condition cause: Hardware failure.
Effect before Action: No GPS positions.
Soft Event Detected: No response from DSP within 5 seconds.
Action: DR functions without GPS positions.
RTC disagreed with GPS time
Condition cause: Low battery voltage while powered down.
Effect before Action: Long time to first fix.
Soft Event Detected: Not implemented in ROM15.
Gyro Failure.
Condition cause: Hardware failure.
Effect before Action: Position goes in circles.
Soft Event Detected: Tested with ADC at startup. Also tested at standstill;
average gyro values (one-second averages) are
collected over ten seconds at standstill. If average is not
between 0.75 V and 4.25 V, declare detection.
Soft Event Cleared: Cleared at reset.
Action: Gyro labeled “bad”. DR suspended. Speed measurement
continues and tacho continues to be calibrated.