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36 Copernicus GPS Receiver
MTBF
The Mean Time Between Failures (MTBF) of the GPS receiver module was
calculated based on parts count - serial reliability using Telecordia Analysis and
Industry field data for the PCB and Trimble Navigation's field return data (i.e. similar
product or technology parts). This is generally referred to as the Trimble Navigation
Reliability Database, and it consists of the following components:
• Repair Center Data and Field Assessment Analysis
• Supplier FIT goals collected through Commodities Engineering
• Commercial Databases (i.e. Telecordia and MIL-STD-217)
• Trirnble Navigation's Internal Qualification Test Data
• Assumed Duty Cycle, 8760 hours per year
• MTBF at Rated Duty Cycle, 819050 hours MTBF