GNSS Antennas for Reliable Positioning and High Precision Applications

What Is a GNSS Antenna

A GNSS antenna is an RF antenna designed to receive signals from global navigation satellite systems such as GPS, BeiDou, Galileo and GLONASS. It is a critical part of any positioning system because the receiver can only calculate position accurately when the incoming satellite signals are received with sufficient quality.

GNSS antennas are used in a wide range of products, including vehicle terminals, tracking devices, surveying instruments, mapping systems, UAVs, industrial equipment and high-precision RTK platforms.

BAT Wireless provides GNSS antenna solutions for both standard positioning and high-precision applications, with options for different frequency bands, structures, cables, connectors and mounting methods.

GPS Antennas and Multi Constellation GNSS Antennas

The terms GPS antenna and GNSS antenna are often used together, but they are not identical.

A GPS antenna is designed primarily to receive signals from the GPS constellation. A multi-constellation GNSS antenna can support several navigation systems, including GPS, BeiDou, Galileo and GLONASS.

Using multiple constellations can increase the number of available satellites and improve positioning availability, especially in environments where part of the sky is blocked by buildings, terrain or other structures.

For modern positioning devices, multi-constellation GNSS is increasingly common because it provides greater flexibility than a GPS-only system.

Active GNSS Antennas and Passive GNSS Antennas

GNSS antennas can generally be divided into active and passive designs.

A passive GNSS antenna contains the antenna element itself but does not include an integrated low-noise amplifier. It can be suitable when the antenna is positioned close to the GNSS receiver and cable loss is limited.

An active GNSS antenna includes a low-noise amplifier, or LNA, to strengthen the received satellite signal before it travels through the coaxial cable.

Active antennas are commonly used when:

• The antenna is installed away from the receiver
• A longer RF cable is required
• Cable loss needs to be compensated
• The system requires more installation flexibility

The correct choice depends on the receiver architecture, cable length and system-level RF design.

GNSS Antennas for Vehicle Telematics

Vehicle telematics is one of the most common GNSS applications.

GNSS provides positioning information for fleet management, navigation, vehicle tracking and connected transportation systems. Cellular communication is often used at the same time to transmit location and operating data to remote servers.

A vehicle GNSS antenna therefore needs to perform reliably in a complex RF environment.

The vehicle body contains large metal surfaces that can affect antenna characteristics. Installation position, ground conditions, cable routing and nearby cellular or Wi-Fi antennas may all influence performance.

For this reason, vehicle antenna selection should consider the complete telematics system rather than only the GNSS specification.

Combination antennas integrating Cellular and GNSS can also be used to simplify vehicle installation and reduce the number of separate antenna housings.

GNSS Antennas for IoT Tracking and Smart Mobility

GNSS is widely used in IoT tracking devices and smart mobility systems where accurate location information needs to be combined with wireless data communication.

Typical applications include:

• Asset tracking
• Logistics terminals
• Shared mobility devices
• Remote monitoring equipment
• Transportation infrastructure
• Smart city terminals

In these products, antenna size and installation space may be limited. Engineers therefore need to balance mechanical integration with signal reception.

Compact patch antennas, embedded designs and external GNSS antennas can all be considered depending on the application.

High Precision GNSS and RTK Antennas

Some positioning applications require much higher accuracy than standard GNSS can provide.

RTK, or Real-Time Kinematic positioning, uses carrier-phase measurements and correction data to achieve centimeter-level positioning under suitable conditions.

An RTK antenna typically needs stable multi-band and multi-constellation reception.

Important design factors can include:

• Multi-frequency support
• Phase-center stability
• Multipath resistance
• Antenna placement
• Signal quality
• Environmental conditions

RTK antennas are commonly used in surveying, mapping, precision agriculture, UAVs, construction and autonomous equipment.

For high-precision systems, the antenna should be evaluated together with the receiver and the complete installation environment.

What Affects GNSS Antenna Performance

GNSS signals are relatively weak when they reach the Earth, so antenna integration is especially important.

Several factors can affect performance.

Sky visibility
The antenna should have the clearest practical view of the sky.

Nearby metal
Metal structures can alter the antenna radiation pattern and increase multipath effects.

Cable loss
Long coaxial cables can reduce signal strength before the signal reaches the receiver.

LNA performance
For active antennas, amplifier gain and noise figure influence the RF signal chain.

Other wireless systems
Cellular, Wi-Fi and other transmitters operating in the same device can create additional RF integration challenges.

Mounting position
The final installation location can significantly affect satellite visibility and signal quality.

How to Choose the Right GNSS Antenna

The first step is to confirm which satellite constellations and frequency bands the receiver supports.

Next, determine whether the system requires standard positioning or high-precision multi-band GNSS.

Engineers should also consider:

• Active or passive design
• Antenna dimensions
• Cable length
• Connector type
• Mounting method
• Required gain
• LNA specifications
• Mechanical environment
• Other RF systems in the device

A standard vehicle tracker and a high-precision surveying receiver have very different antenna requirements, even though both use GNSS.

The antenna should therefore be selected according to the complete application.

Custom GNSS Antenna Solutions from BAT Wireless

BAT Wireless provides standard and customized GNSS antenna solutions for vehicle telematics, IoT tracking, surveying, mapping, smart mobility and high-precision positioning applications.

Depending on project requirements, customization can include frequency coverage, antenna structure, cable length, RF connector, mounting method and mechanical configuration.

BAT Wireless can also support antenna selection and RF integration according to the actual receiver, device structure and operating environment.

For products that require multiple wireless technologies, BAT Wireless also provides Cellular, Wi-Fi, Bluetooth, LoRa and Combination Antenna solutions.

Building More Reliable GNSS Positioning

Reliable GNSS positioning depends on more than the receiver alone.

The antenna, cable, LNA, mounting position, surrounding structures and satellite visibility all affect system performance.

For vehicle navigation, IoT tracking, surveying, mapping, smart mobility and RTK applications, selecting the right GNSS antenna early in the product design process can help reduce RF integration problems and improve positioning stability.

Whether the project requires a compact GPS antenna, active multi-constellation GNSS antenna or high-precision RTK solution, the antenna should be matched to the actual frequency, mechanical and positioning requirements.