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Thunderbolt precision gps 10MHZ frequency&time standard
Thunderbolt GPS Disciplined Clock
Precise GPS Clock for Wireless Infrastructure
The Thunderbolt GPS Disciplined Clock is Trimble s latest offering for GPS synchronization devices targeting the wireless infrastructure. This fourth-generation GPS clock combines an 8-channel GPS receiver, control circuitry and a high-quality ovenized oscillator on a single board, providing increased integrity and reliability at a lower size and cost.
The GPS clock s level of integration makes it a perfect solution for precise timing applications in the wireless industry. Among its uses are synchronizing the E911 positioning infrastructure and maximizing bandwidth for wireless local loop.
The architecture is comparable to systems currently used to maintain the tough CDMA holdover specification. This makes the Thunderbolt GPS clock a natural for a CDMA
clock, the digital standard for cellular phones.
Trimble s approach is unique. The Thunderbolt GPS Clock outputs a 10 MHz reference signal and a 1 PPS signal with an over-determined solution synchronized to GPS or UTC time. The 10 MHz reference accommodates applications requiring sub-microsecond timing.
A single microprocessor performs both the GPS navigation and oscillator disciplining functions. The GPS receiver is driven directly by the 10 MHz output signal of the oscillator. This is calibrated against the incoming GPS signal, with the resulting clock and frequency measurements fed into the oscillator frequency control algorithm.
The T-RAIM (Time-Receiver Autonomous Integrity Monitor) algorithm is used to monitor satellites to ensure signal integrity.
Matching the Thunderbolt GPS Clock with Trimble s Bullet antenna creates a system that provides reliable performance in hostile environments. The system can be easily calibrated for different cable lengths.
The high level of integration and volume production techniques make the Thunderbolt GPS Disciplined Clock an extremely cost-competitive timing solution for volume synchronization applications.
* Ovenized quartz oscillator provides clean 10 MHz (1 PPS) signal that maximizes bandwidth
* Combined GPS receiver and ovenized oscillator minimizes size and cost
* High volume manufacturing provides reliable low-cost products
IMG_5011.jpg picture by flyingbest
IMG_5004.jpg picture by flyingbest
General L1 frequency, CA/code (SPS), 8-channel
PPS accuracy UTC 20 nanoseconds (one sigma)
10 MHz accuracy 1.16 x 10-12 (one day average)
10 MHz stability See graph below
Power consumption 15 watts cold; 10 watts steady state
Note: For more details about the power supply, please refer to:
http://trl.trimble.com/dscgi/ds.py/Get/File-10001/ThunderBoltBook2003.pdf
