INTERGEO 2025 | Unicore Launches UM98XC Series: All-Constellation Multi-Frequency High-Precision RTK GNSS Modules Supporting L-Band & CLAS

At INTERGEO 2025 in Frankfurt, Germany, Unicore unveiled its UM98XC series—a new  family of high-precision RTK GNSS modules supporting all-constellation, multi-frequency  signals and satellite-based augmentation. Designed as an all-in-one solution, the series targets precision agriculture, UAVs, and surveying and mapping applications.

Key Features

•        Integrated positioning algorithms supporting all-constellation, multi-frequency RTK (Real-Time Kinematic), PPP-RTK (Precise Point Positioning–Real-Time Kinematic), PPP-AR (Precise Point Positioning with Ambiguity Resolution), PPP (Precise Point Positioning), and heading

•        Multi-GNSS PPP fusion leveraging open-access correction services, including QZSS L6E MADOCA-PPP, BDS B2b-PPP and Galileo E6-HAS

•        High-precision PPP-RTK positioning enabled by QZSS L6D CLAS (Centimeter Level Augmentation Service), a free-to-use satellite-based augmentation service

•        Global PPP-AR positioning over land via TruePoint | REACH’s satellite-based L-band correction service

L-Band: TruePoint | REACH

TruePoint | REACH L-band service is a global, 24/7 real-time PPP-AR positioning solution that delivers centimeter-level accuracy worldwide. When used with Unicore’s UM98XC series GNSS modules, it achieves convergence in under 5 minutes, with horizontal accuracy better than 3 cm (RMS) and vertical accuracy better than 6 cm (RMS). Users can achieve high-precision positioning with a single receiver, without local base stations or CORS—making the solution ideal for remote or connectivity-limited areas where terrestrial communication networks are unavailable or unreliable.

Service Performance

Unicore UM98XC series used with TruePoint | REACH L-band service.

(Test Location: Beijing, China)                                    

(Test Location: Berlin, Germany)

Regional Augmentation: QZSS L6D CLAS HighPrecision Positioning Service

Since QZSS launched CLAS in November 2018, the service has undergone years of iterative development and updates. CLAS now provides augmentation capabilities for GPS, Galileo, QZSS, and BDS over Japan’s territory and surrounding maritime areas. It broadcasts SSR (State-Space Representation) correction data, including orbit, clock, satellite code bias, and phase bias corrections, leveraging PPP-RTK technology to significantly enhance positioning accuracy.

CLAS Coverage Area

The QZSS L6 signal employs CSK (Code Shift Keying) modulation, specifically CSK(8,1), which is more challenging to acquire and track compared to other GNSS signal modulation schemes. Unicore utilizes its proprietary GNSS SoC that integrates RF, baseband and highprecision algorithms, and has optimized the CSK tracking and demodulation algorithm for the QZSS L6 signal, achieving stable and reliable tracking of CSK-modulated signals.

Service Performance

The UM98XC series leverages the L6D CLAS service to deliver positioning performance over Japan and its surrounding maritime areas with horizontal accuracy better than 5 cm (RMS) and vertical accuracy better than 10 cm (RMS).

(Test Location: Tokyo, Japan)

Global Free PPP Services

Currently, free PPP services are available from the following systems:

•        BDS B2b signal, providing PPP coverage over the Asia-Pacific region

•        Galileo HAS (High Accuracy Service) broadcast via the E6 signal, offering global coverage

•        QZSS MADOCA-PPP service broadcast via the L6E signal, covering the Asia-Pacific region and Australia

•        SouthPAN’s L5 PVS service, covering Australia and New Zealand

Coverage Area

While regional PPP services are limited by the number of supported satellite constellations—restricting satellite availability, operational time, and coverage—Unicore’s multi-constellation fused UniMG PPP positioning technology overcomes these limitations by simultaneously integrating precise correction data decoded from all available signals across multiple systems. This inter-constellation complementarity enables seamless global PPP service, significantly reducing convergence time while enhancing positioning stability and reliability.

Positioning Performance

(Test Location: Beijing, China)

Furthermore, Unicore's RTKP Fusion technology leverages RTK's rapid convergence to accelerate the PPP convergence process and unifies the coordinate frames of both RTK and PPP. In the event of an RTK correction link outage, this technology enables a smooth transition to centimeter-level PPP positioning, ensuring service continuity. Upon restoration of the RTK link, the centimeter-level position provided by PPP enables rapid ambiguity resolution, allowing RTK to re-converge quickly. This seamless switching mechanism eliminates position jumps during service transitions, significantly enhancing the availability of continuous centimeter-level accuracy. Additionally, the RTKP Fusion technology allows for mutual cross-validation between the RTK and PPP solutions, further improving the overall reliability of positioning results.

Note: Items marked with an asterisk (*) indicate open-sky, unobstructed environments.

Unicore UM98XC series expands the horizons for high-precision positioning. Engineered to deliver stable, continuous, and reliable performance across diverse environments, this product line is poised to empower a wide range of applications, including precision agriculture, UAVs, and surveying & mapping.