Tallysman TWA928L Embedded GNSS Antenna

Tallysman TWA928L Embedded Autonomous Vehicle GNSS Antenna + L-Band

The patent pending TWA928L embedded GNSS antenna for autonomous vehicles employs Tallysman's unique Accutenna® technology, providing high gain over GPS (L1/L2/L5), QZSS (L1/L2/L5), GLONASS (G1/G2/G3), Galileo (E1/E5a/E5b), BeiDou (B1/B2/B2a) and NavIC-L5, including the satellite-based augmentation system (SBAS) available in the region of operation [WAAS (North America), EGNOS (Europe), MSAS (Japan), or GAGAN (India)], as well as L-band correction services.



The TWA928L AccuAuto embedded GNSS antenna has been designed to meet the demanding needs of the autonomous vehicle market. It features a patented Tallysman® Accutenna® technology multi-constellation and multi-frequency antenna element. This antenna features an integrated ground plane, radome, and underside cover that provides mist and condensation protection. The bottom cover also supports the antenna cable and mitigates cable vibration to ensure the antenna has a long service life, while the ground plane improves antenna performance. All TWA928L electronic components are Automotive Electronics Council (AEC) certified, designed to perform under the most challenging environmental conditions, such as extreme temperatures (-40 °C to +125 °C) and continuous shock and vibration.

Filtering out-of-band and in-band radio frequencies is a key requirement of a high-quality antenna. To prevent out-of-band noise from saturating the antenna, the TWA928L has a deep pre-filter. This feature enables reliable GNSS signal reception in challenging urban environments where inter-modulated signal interference from LTE and other cellular bands is common.

Other key components are precision-tuned, twin circular dual-feed (Patented Accutenna® Technology), stacked patch elements. The signals from the two orthogonal feeds are combined in a hybrid combiner, amplified in a wide-band LNA, then band-split for narrow filtering in each band and further amplified prior to recombination at the output. These features allow the TWA928L antenna to offer an excellent axial ratio, enabling multipath mitigation, leading to a very tight antenna phase center.

Tallysman’s TWA928L antenna is ideally suited for Real-Time Kinematic (RTK) and Precise Point Positioning (PPP) positioning, for autonomous vehicle navigation and guidance, and other applications where accuracy and precision matters.


  • Autonomous vehicle navigation
  • Precision GNSS positioning
  • Mission-critical GNSS timing & synchronization
  • RTK / PPP surveying systems
  • Safety & security


  • Integrated ground plane
  • Light, compact, and robust design
  • Low noise preamp < 2.5 dB typ.
  • Axial ratio: < 2.0 dB typ.
  • Tight phase centre variation (PCV)
  • High-gain LNA: 28 dB typ.
  • Low current (30 mA)
  • Low noise figure (2.5 dB)
  • ESD circuit protection: 15 kV
  • Invariant performance from 2.5 to 16 VDC
  • REACH, RoHS, AEC compliant


  • Great multipath rejection
  • Increased system accuracy
  • Great signal-to-noise ratio


Calian GNSS (formerly Tallysman Wireless) offers a warranty of 1-3 years on all of it’s products. The warranty ensures that the products are free from defects of materials or workmanship and conform to Calian’s specifications under normal use. Embedded antennas are covered by a one (1) year standard warranty. All housed antennas and accessories (inline amplifiers, splitters, and bias tees) manufactured after January 1, 2020 are covered by a three-year warranty. The warranty is covered in more detail on the Calian GNSS Warranty page.

Why Buy from Us?

In business since 2004, Canal Geomatics is an authorized dealer for Calian GNSS and has established itself as an industry-leading distributor of high-precision positioning products in North America. Our mission is to find the best solution for each unique application and extend premium support to ensure the long-term success of our customers. We offer both volume and reseller discounts for the majority of our product lines.


The TWA928L embedded GNSS antenna is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.