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SPSx51 Modular GPS Receivers User Guide 111
Specifications 10
Performance specifications
Feature Specification
Measurements • Advanced Trimble Maxwell
™
5 Custom GPS chip
• High-precision multiple correlator for L1/L2 pseudo-range measurements
• Unfiltered, unsmoothed pseudo-range measurements for low-noise, low
multipath error, low-time domain correclation, and high-dynamic response
• Very low noise carrier phase measurements with <1 mm precision in a 1 Hz
bandwidth
• L1/L2 signal-to-noise ratios reported in dB-Hz
• Proven Trimble low-elevation tracking technology
• Trimble EVEREST
™
multipath signal rejection
• 72-channel L1 C/A Code, L1/L2 Full Cycle Carrier. Upgradable to L2C and
GLONASS L1/L2 Full Cycle Carrier. See page 114.
• 72-channel L1 C/A Code, L1/L2/L2C Full Cycle Carrier (SPS751/SPS851).
Upgradable to GLONASS L1/L2 Full Cycle Carrier and L5. See page 114.
(SPS851)
• 4-channel SBAS (WAAS, EGNOS, and MSAS corrections)
Code differential GPS
positioning
1
Horizontal accuracy
Vertical accuracy
1
Accuracy and reliability may be subject to anomalies such as multipath, obstructions, satellite geometry, and
atmospheric conditions. Always follow recommended practices.
±(0.25 m + 1 ppm) RMS, ± (0.8 ft + 1 ppm) RMS
±(0.50 m + 1 ppm) RMS, ± (1.6 ft + 1 ppm) RMS
SBAS (WAAS/EGNOS/MSAS)
Horizontal accuracy
2
Vertical accuracy
2
2
Depends on WAAS, EGNOS, and MSAS system performance.
Typically <1 m (3.3 ft)
Typically <5 m (16.4 ft)
OmniSTAR positioning
VBS service accuracy
XP service accuracy
HP service accuracy
Horizontal <1 m (3.3 ft)
Horizontal 0.2 m (0.66 ft), Vertical 0.3 m (1.0 ft)
Horizontal 0.1 m (0.33 ft), Vertical 0.15 m (0.5 ft)
Location RTK positioning
Horizontal accuracy
Vertical accuracy
±(0.07 m + 1 ppm) RMS, ± (0.23 ft +1 ppm) RMS
±(0.07 m + 1 ppm) RMS, ± (0.23 ft +1 ppm) RMS (SPS551)
±(0.02 m + 1 ppm) RMS, ± (0.07 ft +1 ppm) RMS (SPS651)
RTK positioning
Horizontal accuracy
Vertical accuracy
±(10 mm + 1 ppm) RMS, ± (0.032 ft +1 ppm) RMS (SPS751/SPS851)
±(20 mm + 1 ppm) RMS, ± (0.065 ft +1 ppm) RMS (SPS751/SPS851)
Heading accuracy with
additional SPS551, SPS551H,
SPS751, or SPS851
0.05° RMS (10 m antenna separation)
Does not require shore-based corrections for heading solution
Initialization time
Regular RTK operation
with base station
RTK operation with
Scalable GPS
infrastructure
Initialization reliability
3
3
May be affected by atmospheric conditions, signal multipath, and satellite geometry. Initialization reliability is
continuously monitored to ensure highest quality.
Single/Multi-base minimum 10 sec + 0.5 times baseline length in km, <30 km
Typically, <30 seconds anywhere within coverage area (SPS751 Max and SPS851
only).
Typically >99.9%