Products on Show
DAY 2: Advanced triple-band antenna and smart GNSS signal splitter provide RTK and PPP accuracy
Tallysman is at ADAS & Autonomous Vehicle Technology Expo in Stuttgart to demonstrate its RTK (real-time kinematics) and PPP (precise point positioning) accurate antennas, featuring a tight radio frequency phase center variation (L1/L2/L5, etc), strong multipath mitigation, wide bandwidth to support all constellations and their spread spectrum signals, as well as deep filtering to mitigate near band signals.
According to Tallysman, the placement of a GNSS antenna in an automotive application is critical. Key considerations include the facts that surface currents on a metallic roof can interfere with the weak GNSS signals, poor implementation can increase reflections from below and above the antenna, and proximity to other radio frequency transmitters or digital devices/cables can degrade the GNSS performance.
Tallysman’s ADAS-class GNSS system (receiver, antenna and corrections) can provide positions accurate to ~0.1m. This positioning information will be available to the sensor fusion algorithm to enable lane keeping and situational awareness and provide navigation information.
Tallysman’s automotive-grade TWA928LXF antenna supports all GNSS constellations (GPS (QZSS)/GLONASS/Galileo/Beidou and Navic). The TWA928LXF is a triple-band antenna and also supports L-Band corrections.
Tallysman also manufactures a full-band machine control GNSS antenna that supports all the frequencies and signals listed above and adds QZSS (L6), Galileo (E6) and Beidou (B3) support. Galileo and QZSS broadcast GNSS corrections in the (L6/E6) frequency band (1,257-1,300MHz). Galileo’s GNSS (GPS/Galileo) High Accuracy Service correction service will provide global coverage and accuracy of <0.2m (95% CI after convergence). The QZSS regional GNSS constellation will also broadcast Centimeter Level Augmentation Service (CLAS) correction in the L6 frequency band.
Furthermore, when a user (vehicle) is out of cellular coverage, the worldwide Iridium Low Earth Orbit (LEO) Communication constellation is used. Commercial off-the-shelf modems and phones are available from Tallysman. Iridium antennas are offered in active (receive only) and passive (transmit and receive) models and must be certified by Iridium.