Antennas for Iridium STL PNT sign and for GNSS-based timing – Inside GNSS

Tallysman Wireless introduced two lightweight, compact Iridium active helix antennas: the chassis HC610 and the embedded HC610E. They receive the STL (Iridium Satellite Time and Location) signals, which are used by STL terminals to provide worldwide position, navigation and timing independent of GPS / GNSS via an encrypted satellite broadcast signal that is strong, secure and can be received indoors. STL signals provide an alternative to extending and authenticating time for applications such as power grids, wireless communications networks and financial systems, as well as for the location of private and public infrastructure.

The HC610 and HC610E are active Iridium antennas that only work in receive mode and allow the installation of Iridium terminals at a distance of several tens of meters from the antenna. The antennas have a precisely tuned spiral element that provides an axial relationship and works without a ground plane. They also have a low-power, low-noise amplifier (LNA) and pre-filter to prevent harmonic interference from high-amplitude signals such as 700 MHz band LTE and other nearby in-band cellular signals.


The HC610 (24g) housing is 33mm wide and 54.2mm high and has a rugged, military grade IP67 plastic housing with an SMA connector on the base and two screw holes for surface mounting.


The embedded HC610E (10g) is 27.5mm wide and 38.7mm high and can be installed in a custom chassis. It offers an MCX socket mounted on the base. An embedded spiral mounting ring is available as an option, with which the antenna can be attached to a flat surface.

Smart GNSS timing antenna

Tallymatics Inc., an associate, announced the TW5382 smart GNSS antenna for highly accurate 5G timing. The TW5382 is a multiband 5G smart GNSS antenna / receiver with multiple constellations delivering 5 ns (1-).

Sigma, clear sky view) timing accuracy. The TW5382 consists of two components: a Tallysman GNSS Accutenna technology antenna and a professional GNSS timing receiver module.

Accutenna technology supports the full bandwidth of the TW5382 receiver, strong multipath reduction and depth filtering in a compact IP69K housing. These features enable the antenna to deliver a strong, clean, right-band, circularly polarized, in-band signal to the receiver.

The professional multi-constellation and multi-signal timing receiver of the TW5382 tracks the signals GPS / QZSS (L1 / L2), GLONASS (G1 / G2), Galileo (E1 / E5b) and BeiDou (B1 / B2). The dual frequency GNSS enables the receiver to minimize the delay in the ionosphere and improve multipath mitigation. Other important features of the GNSS receiver are the support of anti-jamming and anti-spoofing, the monitoring of the autonomous integrity of the timing receiver (T-RAIM) and GNSS extension systems: WAAS (USA), EGNOS (Europe), MSAS ( Japan), and GAGAN (India), all of which provide orbit and clock corrections and health and integrity information.

By tracking multiple constellations, the GNSS receiver can report the Coordinated Universal Time (UTC) estimated by each constellation. The receiver can be configured to output either the GPS, GLONASS, Galileo or BeiDou implementation of UTC. The timing pulse can also be configured to suit the needs of the user.

Tallymatics TW5382 Smart GNSS Antenna

The TW5382 supports an RS-485 communication interface via which the receiver can be configured and monitored.

Finally, the combination of the GNSS antenna and the receiver in a single package ensures that each intelligent antenna produces exactly the same time signal, as every delay in the intelligent antenna cable is practically identical. Only the length of the user’s timing pulse cable (intelligent antenna to user device) needs to be considered, which simplifies the installation of the operator.

Both Tallysman and Tallymatics are owned by Calian, an Ottawa-based consulting firm.

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