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Resolution T
Full-featured, low-cost, embedded GPS Timing Receiver |
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| datasheet |
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Trimble’s Resolution™ T GPS
Timing Receiver is a significant new development in GPS
architecture: the general purpose,
DSP-based software GPS timing
receiver. The development of
Trimble DSP/GPS software was
key to this accomplishment. |
| Precise Timing Where You Need It |
| The receiver is an all-in-view,
12-channel, parallel-tracking,
embeddable GPS receiver designed
to provide precise GPS or
UTC time and synchronization
for many static timing applications.
The timing accuracy will
provide for your current needs
with plenty of headroom for
future requirements. |
| This low-cost, yet highly accurate
and reliable receiver allows the
system integrator to put precise
timing and synchronization into
locations where cost or size is a
limitation. Rather than sharing
time from a single timing source,
with the resultant delays and loss
of accuracy, you now can have
precise time (synchronization) at
every location regardless of how
isolated or remote. |
| Features Flexibility with Software |
| To provide a true softwaredriven
GPS timing receiver, the
Resolution T receiver uses an
off-the-shelf, software programmable,
general-purpose, digital
signal processor (DSP) in place
of the usual custom GPS ASIC.
Using a general-purpose DSP
allows incremental software
improvements to be implemented
throughout the product
life cycle. This is not possible in
custom GPS hardware ASICs,
because most features are permanently
locked in the hardware
design. The Resolution T
receiver can be updated easily
in the field with new features
as they become available. The
modular design also allows for
both reduced integration time
and low implementation risk. |
| The Resolution T receiver
outputs a 1 Pulse-per-second
(1 PPS) timing signal accurate
to within 15 nanoseconds of
GPS or UTC (1 sigma) when
using an overdetermined solution
in a stationary mode. |
| 3 or 5 Volt Antenna Compatible |
| The receiver is designed for 3.3
VDC prime power, but provides
a separate pin on the I/O connector
for powering the antenna
with a user-supplied voltage from
3.0 to 5.5 VDC. |
| The Resolution T Starter Kit
provides everything you need
to start integrating the module
into your application. The kit includes
an active, external 5VDC
Bullet-style antenna, 50 feet of
RG-59 cable, and an AC/DC
power adapter. The starter kit enclosure
includes a mother board
that provides serial output, and a
serial interface cable. A reference
manual and monitor programs
are provided on CD-ROM. |
| Resolution T - Technical Data |
| Performance Specifications
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| General: |
L1 (1575.42 MHz) Frequency, C/A Code, 12-channel,
parallel-tracking receiver, DSP-based |
| Update rate: |
TSIP @ 1 Hz; NMEA @ 1 HZ |
| Accuracy: |
Horizontal Position: <6 meters (50%), <9 meters (90%)
Altitude Position: <11 meters (50%), <18 meters (90%)
Velocity: 0.06 m/sec
PPS: within 15 ns to GPS/UTC (1 Sigma)
<5 ns with quantization error removed |
| Acquisition: |
Reacquisition: <2 sec. (90%)
Hot Start: <14 sec (50%), <18 sec (90%)
Warm Start: <41 sec (50%), <45 sec (90%)
Cold Start: <46 sec (50%), <50 sec (90%)
Cold start requires no initialization. Warm start implies
last position, time and almanac are saved by backup
power. Hot start implies ephemeris also saved. Hot and Warm are shown for comparison purposes and are not
used in timing applications. |
| Sensitivity: |
Acquisition -136 dBm
Tracking -141 dBm |
Operational (COCOM)
Limits: |
Altitude 18,000 m
Velocity 515 m/s
Either limit may be exceeded, but not both |
| Interface Characteristics
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| Connectors: |
I/O: 8-pin (2x4) 2 mm Male Header
RF: Right-angle SMB (SMA optional) |
| Serial Port: |
1 serial port (transmit/receive) |
| PPS: |
3.3 V CMOS-compatible TTL-level pulse,
once per second
Rising edge of the pulse synchronized with
GPS/UTC |
| Protocols: |
TSIP @ 9600 baud, 8 bits
NMEA 0183 v3.0 @ 4800 baud, 8 bits |
| NMEA Messages: |
GGA, VTG, GLL, ZDA, GSA, GSV and RMC
Messages selectable by TSIP command
Selection stored in flash memory |
| Electrical Specifications
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| Prime power: |
+3.3 VDC ±0.3 VDC |
| Power consumption: |
GPS board only: 350 mW @ 3.3 V |
| Ripple Noise: |
50 mV, peak to peak from 1 Hz to 1 MHz |
| Antenna Fault Protection: |
Short-circuit/open detection and protection |
| Environmental Specifications
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| Operating Temperature: |
-40° C to +85° C |
| Storage Temperature: |
-55° C to +105° C |
| Vibration: |
0.008 g²/Hz 5 Hz to 20 Hz
0.05 g²/Hz 20 Hz to 100 Hz
-3 dB/octave 100 Hz to 900 Hz |
| Operating Humidity: |
5% to 95% R.H. non-condensing, at +60° C |
| Altitude: |
-400 to 18,000 m max |
| Physical Characteristics : |
| Dimensions: |
66.3mm L x 32.1mm W x 8.5mm H
(2.6"L x 1.3"W x 0.33"H) |
| Weight: |
12.5 grams (0.4 ounce) |
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