ashtech HDS800, Reference Manual

Page: 43 / 678

27
Receiver Description
Specifications
GNSS
Characteristics
• 240 (2 x 120) channels:
– GPS L1 C/A, L1/L2 P, L2C, L5
– GLONASS L1 and L2 C/A
– GALILEO E1 and E5 (including GIOVE-A and GIOVE-B
test satellites)
– SBAS (WAAS/EGNOS/MSAS)
• Fully independent code and phase measurements
• Z-Blade™ technology for optimal GNSS performance
• Ashtech GNSS centric algorithm: Fully independent
GNSS signal tracking and processing (1)
• Quick signal detection engines for fast acquisition and re-
acquisition of GNSS signals.
• Fast and stable RTK solution
• Up to 20 Hz real-time raw data, position and heading
output
• Advanced multipath mitigation technique
• RTK base and rover modes, post-processing.
Real-Time
Accuracy
All mentioned values are RMS. See notes (2) and (3)
SBAS (WAAS/EGNOS/MSAS)
• Horizontal < 50 cm (1.64 ft)
DGPS
• Horizontal < 25 cm (0.82 ft) + 1ppm (4)
RTK
• Horizontal: 1 cm + 1 ppm (4)
• Vertical: 2 cm + 1 ppm (4)
Flying RTK™
• 5 cm + 1 ppm horizontal for baselines up to 1000 km
Heading, Pitch/Roll
• Heading: <0.2 degree/baseline (m) (5)
1. All the available GNSS signals are processed equally and combined for best performance in harsh
environment.
2. Accuracy and TTFF specifications may be affected by atmospheric conditions, signal multipath, and
satellite geometry. Position accuracy specifications are for horizontal positioning. Vertical error is typically less
than twice the horizontal error.
3. Performance values assume minimum of five satellites, following the procedures recommended in this
manual. High multipath areas, high PDOP values and periods of severe atmospheric conditions may degrade
performance.
4. Steady state value after sufficient convergence time.