GPS and GNSS Antennas: Choosing the Right Solution

GPS is a term almost everyone recognises, but it describes only one of several global navigation satellite systems (GNSS) now in active use. For engineers and system designers specifying navigation or timing antennas in 2026, the distinction matters — as does understanding which antenna type is best suited to a given application.

GPS, GNSS: What's the Difference?

GPS (Global Positioning System) is the US-operated satellite navigation system that has been in continuous operation since the 1990s. GNSS is the broader category that encompasses GPS alongside GLONASS (Russia), Galileo (Europe) and BeiDou (China). Modern GNSS antennas receive signals from multiple constellations simultaneously, which significantly improves positioning accuracy and reliability — particularly in environments where the sky view is partially obstructed, such as urban canyons, ports and industrial sites.

Antenna Types for Navigation

Patch antennas are the most common GNSS antenna form factor. The ceramic patch design provides a compact, low-profile unit with good sensitivity and typically right-hand circular polarisation (RHCP) — the correct polarisation for receiving GNSS satellite signals.

Helix antennas offer wider sky view and better rejection of ground-reflected multipath interference than flat patch designs. They are used in applications where positioning accuracy is critical and the antenna may be tilted or in motion, such as marine navigation systems or UAVs.

Active vs. passive. Active GNSS antennas include a built-in low-noise amplifier (LNA) to boost the received satellite signal before it is degraded by cable losses. For cable runs longer than a metre or two, or where the cable has high loss per metre, an active antenna is typically required.

GNSS Antennas for Specific Applications

Vehicle and fleet. Vehicle-mount GNSS antennas need to combine a low profile with good sky view. Magnetic-mount patch antennas are common for fleet applications.

Marine and coastal. Marine GNSS antennas must be rated for continuous outdoor exposure — IP67 as a minimum, with UV-stabilised materials and stainless steel hardware. Dual-frequency GNSS antennas supporting L1 and L2 bands are used in marine chart plotting systems requiring the highest available accuracy.

Industrial and infrastructure. For fixed infrastructure applications — including traffic management systems, smart metering with time-of-use requirements, and grid synchronisation — survey-grade GNSS antennas with high rejection of multipath interference are specified.

Asset tracking and IoT. Compact GNSS antennas for asset tracking devices balance physical size with sufficient performance to acquire and maintain a satellite fix.

View Renair's GPS and GNSS antenna range at renair.co.uk/products.

Frequently Asked Questions

What is the difference between GPS and GNSS antennas?

GPS antennas receive signals only from the US GPS satellite constellation. GNSS antennas receive signals from multiple constellations — GPS, GLONASS, Galileo, BeiDou — simultaneously, which improves accuracy and reliability. In almost all professional applications, a multi-constellation GNSS antenna is the better choice.

Do I need an active or passive GNSS antenna?

Active antennas include a built-in amplifier and are needed when the cable between the antenna and receiver is longer than a metre or two, or where the receiver requires a pre-amplified signal. Passive antennas are used for very short cable runs or when the LNA is located elsewhere in the signal chain.

What does RHCP mean and why does it matter for GNSS?

RHCP stands for Right-Hand Circular Polarisation — the signal polarisation used by GNSS satellite transmissions. GNSS antennas need to match this polarisation to receive satellite signals efficiently. Always confirm RHCP when selecting an antenna for navigation use.