Technology

Introduction

As reliance on Global Navigation Satellite Systems (GNSS) grows across critical industries, so does the vulnerability of these systems to challenging environments, signal blockages, and malicious disruptions like jamming and spoofing. Trimble Maxwell 8^™ technology represents a comprehensive suite of hardware and software innovations engineered from the silicon level up to address these emerging threats. At its core, the Maxwell 8 architecture is designed to maximize the quality of measurements from GNSS and onboard sensors, delivering uninterrupted, centimeter-level continuous positioning and orientation solutions. This document explores the foundational elements of Maxwell 8 technology and how they converge to provide industry leading improvements in accuracy, availability, and integrity.

Trimble Maxwell 8 ASIC

The foundation of this technology is the Maxwell 8 baseband GNSS ASIC (Application-Specific Integrated Circuit). Manufactured using an ultra-dense, microscopic architecture, this 8th-generation chip is a massive leap forward, tripling the capacity of its predecessor. Key technical advancements of the ASIC include:

• 700 Channels per Chip: Designed for maximum signal availability, the ASIC tracks all available satellite signals across all constellations (GPS, GLONASS, Galileo, BeiDou, QZSS, IRNSS, and SBAS). Dual antenna receivers utilize a second 700 channel ASIC for full signal support on both antennas.
• High-Resolution Digitization: The architecture integrates high-resolution internal analog-to-digital converters, replacing lower resolution legacy systems. This drastically increases the receiver's dynamic range, ensuring GNSS signals are preserved even during complex interference.
• Future-Ready Architecture: The hardware is designed to support emerging Low Earth Orbit (LEO) PNT constellations, adding redundancy and security to traditional medium (MEO) and Geosynchronous (GEO) signals.

Trimble JammerGuard^™

Trimble JammerGuard is a patent pending, multi-layered anti-jamming mitigation technology built directly into the Maxwell 8 architecture. Its core function is to actively monitor and suppress unwanted radio frequency (RF) interference across all GNSS bands. JammerGuard protects the receiver through several technology pillars:

• RF Front-End Filtering: Strict filtering elements reject out-of-band signals, while high-performance RF stages maintain a high compression point to prevent the receiver from saturating. Automatic voltage-variable attenuators adapt based on received signal strength to block high-power jammers.
• Advanced DSP Jam Mitigation: Hardware-accelerated digital signal processing automatically deploys multiple time-domain notch filters per RF band to remove continuous wave (CW) jamming. It also features a wideband frequency-domain filter that automatically blanks frequencies where high interference energy is detected, helping to suppress wider band signals. Hardware assistance allows the system to near instantaneously deploy filters to mitigate pulse jamming.
• Resilient Tracking Loops: If jamming causes deep signal fades, the system uses specialized Phase Lock Loops (PLLs) and Frequency Lock Loops (FLLs) to maintain tracking at low signal-to-noise ratios. If the primary L1 signal is lost, the receiver seamlessly maintains its lock on secondary signals.
• L5 Assured^™: Engineered for severe jamming environments, L5 Assured maintains positioning integrity using available GNSS signals. Should the L1 frequency be entirely jammed, the system enables both startup and continuous L5-only navigation using GPS L5, Galileo E5a, and BeiDou B2a signals to deliver uninterrupted RTK/RTX fixes without requiring the L1 band.
• Signal agnostic precision positioning: Trimble’s ProPoint engine is agnostic to the system and signals. It can work from single to triple frequency with any combination of satellite systems and signals. Allowing it to continue to deliver centimeter-level positions during severe jamming.

Anti-Spoofing

Trimble Maxwell 8 Technology employs a multi-dimensional defense against fake satellite signal transmission from a local transmitter. The receiver continuously evaluates incoming signals for indicators of deception, including:

• RF-Level Rejection: Advanced tracking algorithms detect if multiple signals are received from the same satellite, isolating and rejecting the spoofed secondary peaks.
• Signal Authentication: The architecture leverages Galileo OSNMA and Trimble RTX-NMA to cryptographically authenticate broadcast GNSS navigation and ephemeris data in real-time.
• Data and Sanity Checks: The receiver monitors orbital parameters for unexpected changes, performs rigorous Receiver Autonomous Integrity Monitoring (RAIM) and other industry and proprietary tests to isolate conflicting measurements and ephemerides.

ProPoint^™ Positioning Engine

The Trimble ProPoint^™ Engine represents the fifth-generation RTK/RTX positioning engine designed to maintain centimeter-level precision and reliable orientation across severely degraded GNSS environments. Moving away from traditional multi-filter combination models, ProPoint utilizes an advanced single-filter extended state architecture that processes raw code and carrier observations from all satellite constellations simultaneously. This constellation-agnostic approach is tightly coupled with onboard Inertial Measurement Unit (IMU) sensor data, allowing the system to blend accelerometer and gyroscope measurements directly into its position and orientation calculations. A quad-core processor unlocks the full potential of both the Maxwell 8 hardware and the ProPoint^™ positioning engine. By pairing the unified filter with adaptive noise modeling and dynamic motion profiles, the engine effectively rejects signal outliers, mitigates multipath reflections, and bridges coverage gaps delivering high-integrity, low latency output even under dense tree canopy, within urban canyons, or during severe atmospheric and jamming disturbances.

Everest Plus^™ Multipath Rejection

Trimble has continued to improve multipath rejection with advancements to Everest^™ Plus. This advanced technology filters out delayed, reflected GNSS signals by incorporating an updated signal tracking discriminator, extracting additional tracking loop hardware metrics, and deploying a neural network to derive and subtract pseudorange multipath errors before they affect the solution. Furthermore, Everest Plus expands protection beyond traditional narrow-band signals to wideband signals (such as GPS L5, Galileo E5A/E5B, BeiDou B3, and GLONASS P-code). Together with the ProPoint^™ engine's code/carrier filtering, this results in an average multipath reduction of over 30% and an overall improvement in positioning accuracy across urban, forested, and high-reflection environments.

IonoGuard^™

Trimble IonoGuard^™ protects centimeter-level RTK and RTX positioning against solar-induced ionospheric disturbances and scintillation by dynamically measuring atmospheric distortions per satellite and transmitting this information to roving ProPoint receivers. This capability is directly amplified by Maxwell 8's hardware advancements. Expanded multi-frequency channel capacity ensures alternative signals remain available if specific frequencies drop, upgraded baseband tracking enables faster recovery during loss-of-lock events, and Everest^™ Plus and Jammerguard filters strip out multipath and jamming noise. This allows IonoGuard to isolate pure atmospheric error ensuring that high-precision survey, mining, and agricultural operations remain uninterrupted especially across equatorial and high-latitude regions.

Sensor Fusion

Driving the platform's advanced sensor fusion capabilities, a newly upgraded Inertial Measurement Unit (IMU) acts as a cornerstone of the modern receiver architecture. Built on advanced MEMS sensor technology integrated directly onto the receiver board, this upgraded sensor delivers significantly higher dynamic range, lower bias drift, and superior noise density compared to legacy components. Rather than treating inertial data as a secondary backup during GNSS dropouts, the ProPoint^™ Engine tightly couples raw 3D accelerometer and gyroscope measurements directly into its primary Extended Kalman Filter alongside satellite observations. This enhanced sensor performance ensures rapid initial dynamic alignment, precise orientation (pitch, roll, and heading), and improved positioning accuracy, maintaining seamless centimeter-level positioning even during GNSS-denied events, such as navigating under bridges or operating beneath tree canopy.

Spectrum Analyser and Toolkit

To provide users with actionable intelligence about their RF environment, Maxwell 8 based receiver includes an advanced onboard web interface RF Spectrum Monitoring and Interference Toolkit. This tool gives users deep visibility into the local interference environment through real-time spectrum analysis and spectrograms. Because the toolkit utilizes the Maxwell 8's upgraded A/D converters, the resulting Fast Fourier Transforms (FFTs) have a vastly superior dynamic range and exhibit fewer visual artifacts than older systems..Operators can view real-time and historical spectrum displays and spectrograms to rapidly isolate external interference or onboard self-jamming caused by neighboring electronic systems. This visibility substantially shortens vehicle integration timelines, reduces troubleshooting overhead, and allows users to compare live signal performance before and after JammerGuard mitigation.

Access to System Metrics & Diagnostics

Beyond spectrum analysis, Maxwell 8 delivers enhanced metrics to significantly improve operational situational awareness. The platform introduces updated messaging that outputs real-time estimates of received signal strength in each band, Automatic Gain Control (AGC) settings, and active jamming and spoofing threat indicators. These metrics along with base station data quality indicators are integrated directly into the receiver’s modernized web interface. This provides operators with a convenient, standalone graphical overview of system health without requiring external software tools.