Tallysman offers embedded triple-band GNSS antenna - GPS World : GPS World

2022-03-14 03:30:19 By : Mr. Jerry Lin

Tallysman Wireless Inc. has added the low-profile triple-band HC997EXF to its line of embedded helical GNSS antennas, and the TWA928LXF to its AccuAuto line. Both feature the company’s eXtended Filtering (XF).

The HC997EXF is designed for precise positioning, covering the GPS/QZSS-L1/L2/L5, GLONASS-G1/G2/G3, Galileo-E1/E5a/E5b, BeiDou-B1/B2/B2a, and NavIC-L5 frequency bands. It also covers 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 low-profile helical antenna is packaged in a light (11 g) and compact form factor (60 mm wide and 25 mm tall). Its precision-tuned, high-accuracy helical element provides an excellent axial ratio and operates without a ground plane. These features make the HC997EXF suitable for lightweight unmanned aerial vehicle (UAV) navigation and a wide variety of precision applications.

The HC997EXF antenna base has a flying lead and a variety of connectors. To facilitate installation, Tallysman provides an optional embedded helical mounting ring that traps the outer edge of the antenna circuit board to the host circuit board or any flat surface. Tallysman provides support for installation and integration of its embedded helical antennas to ensure optimal performance.

Another new XF antenna, the TWA928LXF, is part of Tallysman’s  AccuAuto autonomous vehicle family of compact and rugged embedded antennas.

The triple-band TWA928LXF 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, including L-band correction services.

The TWA928LXF vehicle antenna features a patented Tallysman Accutenna technology antenna element, 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 that the antenna has a long service life, while the ground plane improves antenna performance.

All AccuAuto antennas are built with Automotive Electronics Council (AEC) certified electronic components designed to perform under the most challenging environmental conditions, such as extreme temperatures, shock and vibration.

eXtended Filtering enables the HC997EXF antenna to mitigate new and existing radio frequency bands that interfere with GNSS signals. The custom XF filtering has been tested to mitigate new (Europe and Japan) and existing LTE signals, enabling the XF antennas to produce clean and pure GNSS radio frequency data.

For example, in North America, the planned Ligado service, which will broadcast in the frequency range of 1526 to 1536 MHz, could affect GNSS antennas that receive space-based L-band correction service signals (1539–1559 MHz).

Similarly, LTE signals or their harmonics, such as the new LTE bands in Europe–Band 32 (1452–1496 MHz)–and Japan–Bands 11 and 21 (1476–1511 MHz)–have affected GNSS antennas and receivers.

Lastly, the Inmarsat satellite communication uplink (1626.5–1660.5 MHz), commonly used on maritime vessels, can also affect nearby GNSS antennas.

Tallysman Wireless also has added eXtended Filtering (XF) to its TW3800 series of Accutenna precision antennas, and will be rolled out to all of Tallysman’s product lines.

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