Design and implementation of a compact RTK GNSS receiver module for centimeter-level positioning accuracy

High-accuracy positioning is essential for applications such as autonomous systems, surveying, and precision agriculture. Real-Time Kinematic (RTK) Global Navigation Satellite System (GNSS) technology offers improvements in positioning up to centimeter level by applying correction data from a reference station. This research presents the development of a compact and integrated RTK GNSS receiver module on a single custom printed circuit board (PCB), incorporating two microcontrollers and an RTK-capable GNSS receiver with electrical supporting components to create the system. Field testing was conducted in both RTK-enabled and standalone GNSS modes, using a known fixed control point for accuracy comparisons. Results show that the module achieved a stable RTK Fix and significantly reduced coordinate drift from an average of 2.86 meters in non-RTK positioning to approximately 44 centimeters under RTK conditions, with potential for further improvements in accuracy under more ideal conditions. The study demonstrates a low-cost and efficient RTK GNSS hardware solution, suitable for real-time embedded applications requiring high positioning precision.