Whitepapers

Trimble ProPoint Engine: Next-Generation Centimeter Positioning and Orientation 3 System Architecture Support for the latest constellations and frequencies The space segment of the world's Global Navigation Satellite System (GNSS) is constantly being modernized with new generations of satellites. These new signals, while improving the performance of user equipment, pose a challenge for receiver manufacturers to support the structure of new signal transmissions. Trimble receivers equipped with Trimble Maxwell ™ 7 and ProPoint technology are ready to reap benefits from all current GNSS signals transmitted on all frequencies. These include: ● GPS: L1 C/A, L1C, L2E, L2C, L5 ● GLONASS: L1 C/A, L1P, L2P, L2 C/A, L3 CDMA ● Galileo: E1, E5A, E5B, E5AltBOC, E6 ● BeiDou: B1C, B1i, B2i, B2A, B2B, B3i ● QZSS: L1 C/A, L1S, L2C, L5, LEX ● IRNSS: S1 C/A, L5 ● SBAS: L1 C/A, L5 ● MSS: Trimble RTX, OmniSTAR ProPoint technology is capable of using all available signal inputs, provided an RTK base receiver is transmitting corrections for the same signals. This has resulted in a more flexible and more accurate solution in challenging GNSS environments. ProPoint technology also allows for flexible signal management, which helps mitigate the effects of signal degradation and provides a GNSS constellation-agnostic operation. For example, when individual frequencies and constellations are spoofed or jammed, the receiver continues to provide positioning using available measurements. Tight coupling of IMU data with RTK and RTX The ProPoint engine is designed from the ground up with inertial navigation and sensor fusion in mind. The raw GNSS measurements, together with the gyroscope and accelerometer data, are combined in a single position and orientation solution. The inertial measurement unit (IMU) in most products is an in-house design built on the same circuit board as the GNSS receiver. This tight integration provides a robust solution that maximizes the benefits of GNSS and INS. Large filter and accurate modeling of all error sources Owing to advances in the GNSS signal spectrum and low-power mobile computing technology, ProPoint was designed with an improved approach to data signal filtering. By combining all of the measurements together into a single filter and estimating the carrier integer ambiguities simultaneously with an extended set of filter states, an optimal solution is achieved. While more computationally intensive, this approach delivers the most flexible use of all available GNSS signals.

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