GNSS & GPS Modules

Global navigation satellite system (GNSS) is the collective term for the network of satellite constellations that provide positioning, navigation, and timing data to receivers on the ground. Modern GNSS modules are designed to receive signals from multiple constellations simultaneously, including GPS, GLONASS, Galileo, and BeiDou, improving positioning accuracy, reliability, and availability across a wide range of environments and applications. These semiconductors output position data in standard formats, most commonly NMEA 0183 sentences via serial interfaces, and communicate with host systems through UART, I2C, or SPI connections depending on the design requirements of the application.

GNSS modules are available in surface mount and through-hole form factors, making them suitable for integration into both compact PCB designs and larger development platforms. Whether you’re building a high-precision industrial positioning system, a low-power IoT tracker, or an embedded navigation device, the right module depends on the constellation support, interface type, power budget, and form factor your design demands. RS Australia stocks a wide range of GNSS and GPS modules from leading manufacturers, giving engineers and electronics procurement teams a reliable source for both evaluation and production quantities.

What is a GNSS and GPS Module?

A GNSS and GPS module is an integrated electronic component that receives signals from orbiting navigation satellites and uses them to calculate an accurate position fix, typically expressed as latitude, longitude, and altitude. The module continuously tracks signals from multiple satellites across one or more constellations, processes the timing data embedded in those signals, and outputs a position solution at a defined update rate.

The four main global navigation satellite constellations that GNSS modules can receive from are:

• GPS (United States): The original and most widely supported global navigation satellite system, operated by the US Department of Defense. GPS provides global coverage and remains the baseline constellation for the majority of GNSS receiver designs.
• GLONASS (Russia): The Russian global navigation satellite system, which operates alongside GPS to increase the total number of visible satellites at any given location. Dual GPS and GLONASS reception improves fix availability and accuracy, particularly at high latitudes and in environments with partially obstructed sky views.
• Galileo (European Union): The European Union's global navigation satellite system, designed to provide high-accuracy civilian positioning independent of US or Russian infrastructure. Galileo offers improved accuracy over GPS alone and is increasingly supported in modern multi-constellation GNSS modules.
• BeiDou (China): China's global navigation satellite system, which has expanded from regional to global coverage. BeiDou support in a GNSS module adds further redundancy and improves positioning performance in regions where BeiDou satellite geometry is particularly strong, including across the Asia-Pacific.

It’s important to distinguish between bare GPS integrated circuits (ICs) and integrated GPS receiver modules, as the two serve different design purposes:

• Bare GPS ICs: A die-level component that provides the core baseband processing function but requires external support circuitry, including an oscillator, RF front-end, and flash memory, to operate. These are suited to experienced RF designers who need precise control over the supporting architecture.
• Integrated GPS Receiver Modules: A self-contained unit that combines the oscillator, flash memory, RF front-end, and often a patch antenna connector within a single module footprint. This integration significantly reduces design complexity and RF engineering burden, making receiver modules the practical choice for the majority of embedded and product development applications.

This integration significantly reduces the design complexity and RF engineering burden for the host system, making receiver modules the practical choice for the majority of product development and embedded applications.

Position data is output as NMEA 0183 sentences via UART or serial interface, which is the established industry standard for GNSS data communication and is supported by virtually all mapping, navigation, and tracking software platforms.

How GNSS and GPS Modules Work

GNSS satellites transmit navigation signals continuously on defined radio frequencies. The primary civilian signal band is L1 at 1.57542 GHz, which is supported by virtually all GNSS receivers. Multi-band modules additionally receive L2 and L5 signals, which enables more precise pseudo-range measurements and significantly improves positioning accuracy by allowing the receiver to correct for ionospheric delay errors that affect single-band receivers.

Each satellite broadcasts a signal that contains precise timing information and ephemeris data describing the satellite's orbital position. The receiver uses this data to calculate the time taken for the signal to travel from the satellite to the GPS antenna, converting that travel time into a distance measurement known as a pseudo-range.

To calculate a three-dimensional position fix, the receiver must acquire signals from at least four satellites and solve for latitude, longitude, altitude, and clock error simultaneously through a process called trilateration. Here’s how that process works internally:

• Signal Reception: The RF front-end receives the incoming satellite signal and passes it through a low-noise amplifier (LNA) to boost the signal while minimising added noise.
• Signal Downconversion: A mixer downconverts the amplified signal from its original high carrier frequency to a lower intermediate frequency that’s easier to process accurately.
• Digitisation: An analogue-to-digital converter (ADC) converts the downconverted signal from an analogue waveform into a digital data stream that the baseband processor can work with.
• Baseband Processing: The baseband processor correlates the digital signal against known satellite codes to identify which satellites are in view, extracts the precise timing data embedded in each signal, and calculates the pseudo-range to each satellite.
• Position Calculation: With pseudo-range measurements from at least four satellites, the processor applies trilateration to solve for a three-dimensional position fix, outputting latitude, longitude, altitude, and a corrected clock value.
• Oscillator and Memory Support: Throughout this process, the on-board oscillator provides the stable timing reference the receiver needs for accurate signal acquisition and pseudo-range calculation. On-board flash memory retains configuration settings, firmware, and satellite almanac data across power cycles, allowing the receiver to reacquire satellites faster on subsequent start-ups.

Cold start time to first fix (TTFF) can be reduced dramatically through Assisted GNSS, or A-GNSS. In A-GNSS operation, a pre-loaded satellite almanac, delivered via a network connection or pre-programmed into the module’s flash memory, tells the receiver where to expect satellites to be in the sky at a given time and location. Rather than scanning the full sky for signals from a cold start, the receiver can go directly to the expected satellite positions, reducing TTFF from several minutes to just a few seconds. This capability is particularly valuable in IoT, automotive, and asset tracking applications where fast, reliable position acquisition after power cycling is a core performance requirement.

Features and Benefits of GNSS & GPS Modules

GNSS and GPS modules vary considerably in capability, and the features that matter most depend on your application's demands around accuracy, power, update rate, and integration complexity. The following covers the key features available across the range and what each one means in practice.

• Fix Status LEDs: Onboard status indicators signal whether the module is actively searching for satellites, has achieved a position fix, or has entered a power conservation mode. This real-time visual feedback simplifies development and field diagnostics without requiring a serial connection to interrogate the module’s output.
• Multi-Constellation Tracking with Configurable Channel Counts: Modules with high channel counts, such as 72-channel receivers, can track satellites across multiple constellations simultaneously. More tracked satellites means a more robust position fix, faster reacquisition after signal loss, and improved performance in challenging environments such as urban canyons or areas with partial sky obstruction.
• High-Frequency Location Updates: Modules with high position update rates deliver more frequent fixes per second, which is essential in applications where the tracked object is moving rapidly and positional latency would degrade system performance, such as in drone navigation, vehicle telematics, or real-time asset tracking.
• High-Sensitivity Acquisition and Tracking: Modules with high tracking sensitivity, such as the -167 dBm tracking sensitivity available on u-blox modules, can maintain a position fix in environments where signal levels are weak, including indoors, in dense urban environments, and under heavy foliage. High acquisition sensitivity also reduces the time needed to achieve an initial fix from a cold start.
• Ultra-Low Power Operating Modes: Power-optimised operating modes, including periodic tracking and power saving states, allow GNSS modules to be used in battery-powered IoT devices, asset trackers, and wearables where minimising current draw is as important as positioning performance. Some modules can drop to microamp-level current consumption in standby while retaining the ability to resume tracking quickly.
• Low Dropout Rates: Reliable signal tracking with minimal position fix dropout ensures consistent, uninterrupted data output in applications where gaps in positioning data are unacceptable, such as fleet management, precision agriculture, and safety-critical navigation systems.
• External Antenna Support: SMA and U.FL connector options allow an external active antenna to be connected, improving signal reception in installations where the module is housed inside an enclosure or deployed in an environment with limited sky visibility. External antenna support is essential for most industrial and automotive integration scenarios.
• On-Board Flash Memory: Integrated flash memory retains firmware, configuration parameters, and satellite almanac data across power cycles. This eliminates the need for full reconfiguration on each power-up, supports faster TTFF through A-GNSS, and allows custom module configurations to be preserved reliably in production deployments.
• Multiple Interface Support with Augmentation Systems: UART, I2C, SPI, and GPIO interfaces give designers flexibility in how the module connects to the host processor. Support for augmentation systems including SBAS, QZSS, and WAAS further improves positioning accuracy by providing differential correction data, particularly valuable in precision applications across Australia and the Asia-Pacific region.
• Compact Form Factor: Small module footprints enable integration into space-constrained designs including wearables, handheld devices, and compact embedded systems without requiring significant PCB real estate or compromising the overall product form factor.

Industrial and Commercial Applications of GNSS and GPS Modules

GNSS and GPS modules are embedded across a broad range of industries and product categories wherever accurate positioning, navigation, or timing is a core system requirement. From safety-critical industrial platforms to everyday consumer devices, their versatility makes them one of the most widely deployed module types in electronics design.

Industrial and Professional Applications

• Asset Tracking, Fleet Management, and Telematics: GNSS modules are the core positioning component in vehicle tracking systems, fleet management platforms, and mobile asset monitors. Combined with cellular or satellite communication hardware, they enable real-time location reporting, route optimisation, geofencing, and driver behaviour monitoring across commercial vehicle fleets and high-value asset pools.
• UAV and Drone Navigation: Drones rely on GNSS modules for stable autonomous flight, waypoint navigation, return-to-home functions, and geofencing compliance. High update rate and multi-constellation support are particularly important in UAV applications, where positional accuracy and fix continuity directly affect flight safety and mission reliability.
• Precision Agriculture and Land Surveying: RTK-enabled GNSS modules support centimetre-level positioning accuracy for autonomous agricultural guidance systems, soil sampling equipment, and precision spraying platforms. The same high-accuracy positioning capability underpins land surveying instruments, mapping drones, and GIS data collection equipment where positional integrity is a fundamental requirement of the output data.
• Maritime and Offshore Positioning: GNSS modules provide vessel positioning, route monitoring, and navigation support across commercial shipping, offshore platforms, and recreational marine applications. Multi-constellation support improves fix availability at sea and in high-latitude operating areas where satellite geometry can be challenging.
• Time Synchronisation for Telecoms and Data Centres: GNSS modules are used as precision timing sources for synchronising telecoms base stations, data centre networks, and financial transaction systems. The highly accurate timing signals embedded in satellite transmissions provide a cost-effective, traceable time reference that supports network synchronisation to nanosecond-level precision.
• Military and Medical Devices: In defence applications, GNSS modules support soldier navigation systems, vehicle positioning, and guided systems requiring robust, jamming-resistant positioning. In medical applications, they enable location-aware devices and emergency response systems where accurate, reliable positioning is directly tied to patient safety outcomes.

Consumer and Embedded Applications

• Smartphones, Tablets, and Laptops: GNSS receiver chips are integrated into virtually all modern mobile devices, providing location services for mapping, navigation, and location-aware applications. Compact die-level ICs and highly integrated modules make it possible to embed GNSS capability within the tight space and power constraints of consumer electronics.
• Wearables, and Portable Navigation Devices: Ultra-low power GNSS modules enable continuous or periodic position tracking in wearable fitness devices, sports watches, and personal navigation equipment, where battery life is the dominant design constraint alongside positioning performance.

Buy GNSS and GPS Modules Online from RS Australia

RS Australia is a trusted distributor of GPS and GNSS receiver modules, stocking a comprehensive range to meet the needs of engineers, embedded designers, and electronics procurement teams across a wide range of industries and applications. Our range spans GPS ICs, GPS receiver modules, GNSS receiver chips, and fully-integrated GNSS GPS modules, covering standard single-constellation receivers through to high-precision multi-constellation designs with RTK capability. Key brands available include Wurth Elektronik, STMicroelectronics, and Quectel, giving you access to proven, production-ready components trusted by embedded designers and system integrators worldwide.

Beyond GNSS and GPS modules, RS Australia stocks a broad selection of wireless communication modules to support your broader embedded design requirements. If your application requires short-range device connectivity, our Bluetooth modules enable reliable wireless communication between nearby devices with minimal power overhead. For designs that need wide-area network connectivity, our cellular modules support data transmission across 4G and 5G networks. Where local network connectivity is the requirement, our Wi-Fi modules provide seamless integration into existing wireless infrastructure.

Browse the full RS Australia range of GPS and GNSS modules online. Ordering is straightforward through the RS website, with nationwide delivery across Australia and next working day dispatch available where applicable. Credit account options are available for qualifying customers. For full details on shipping options, lead times, and delivery to your location, visit our delivery page.