New embedded triple-band GNSS antennas for autonomous autos – Inside GNSS
Tallysman Wireless announces a new line of AccuAuto antennas designed for autonomous vehicles, among others, to provide strong clean code and phase signals that enable high-precision real-time kinematics (RTK) and precision point positioning (PPP) navigation.
The AccuAuto vehicle antenna embedded in Tallysman has a multi-constellation and multi-frequency antenna element, an integrated ground plane, a radome, and an underside cover that provides fog and condensation protection. The bottom cover also supports the antenna cable and reduces cable vibration to ensure the antenna has a long life while the ground plane improves antenna performance. The antennas have a deep pre-filter that minimizes out-of-band noise and maximizes in-band termination. This feature enables reliable GNSS signal reception in challenging urban environments where intermodulated signal interference from LTE and other cellular radio bands is common.
The products follow developments in the automotive industry to provide driver assistance (e.g. lane keeping) and autonomous vehicle navigation when the accuracy requirement is <0.1 meter (i.e. high-precision GNSS phase positioning).
The triple-band TWA928 supports GPS / QZSS-L1 / L2 / L5, GLONASS-G1 / G2 / G3, Galileo-E1 / E5a / E5b, BeiDou-B1 / B2 / B2a and NavIC-L5 signals and frequency bands . t = The TWA928L supports L-band correction services.
Further components are precisely coordinated, double-circular, double-stacked patch elements. The signals from the two orthogonal feeds are combined in a hybrid combiner, amplified in a broadband LNA, then band-split for narrow filtering in each band and further amplified at the output before recombination. These properties allow the TWA928 antenna to offer excellent axial ratio, which allows for multipath reduction and results in a very narrow antenna phase center.