Key Features
and Benefits

• 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 manufac-
turing provides reliable
low-cost products

Thunderbolt GPS Disciplined Clock
Precise GPS Clock for Wireless Infrastructure

The Thunderbolt™GPS
Disciplined Clock is Trimble’s
latest offering for GPS synchro-
nization 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 appli-
cations in the wireless industry.
Among its uses are synchronizing
the E911 positioning infrastruc-
ture and maximizing bandwidth	Trimble’s Thunderbolt GPS Disciplined Clock in enclosure, and board form.
for wireless local loop.

The architecture is compara-
ble 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 refer-
ence 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 tim-
ing. A single microprocessor per-

forms both the GPS navigation
and oscillator disciplining func-
tions. 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 measure-
ments 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 tech-
niques make the Thunderbolt
GPS Disciplined Clock an
extremely cost-competitive
timing solution for volume
synchronization applications.

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