Development of an RTK-GPS Positioning Application with an Improved Position Error Model for Smartphones

Abstract

This study developed a smartphone application that provides wireless communication, NRTIP client, and RTK processing features, and which can simplify the Network RTK-GPS system while reducing the required cost. A determination method for an error model in Network RTK measurements was proposed, considering both random and autocorrelation errors, to accurately calculate the coordinates measured by the application using state estimation filters. The performance evaluation of the developed application showed that it could perform high-precision real-time positioning, within several centimeters of error range at a frequency of 20 Hz. A Kalman Filter was applied to the coordinates measured from the application, to evaluate the appropriateness of the determination method for an error model, as proposed in this study. The results were more accurate, compared with those of the existing error model, which only considered the random error.

Development of a Network RTK Positioning and Gravity-Surveying Application with Gravity Correction Using a Smartphone

“…Results of network RTK positioning from other research [23] has indicated a horizontal positioning accuracy of ±5 cm in Southern Germany. [6,12,24] demonstrated positioning errors of ±2.0 cm and ±5.0 cm for the horizontal and height coordinates, respectively, using network RTK. It follows that the NTRIP client in the app can carry out 3-D positioning using network RTK technology easily and in real-time using the GNSS receiver.…”

“…Reference [5] evaluated the possibility of adopting a smartphone-based monitoring system for coastal monitoring through prevision evaluation using smartphone-based technology. In [6] an app making it possible to position network RTK using a smartphone was implemented. Educational content has been produced and distributed for plastic surgery trainees and surgeons with smartphones [7–9].…”

V-Alert: Description and Validation of a Vulnerable Road User Alert System in the Framework of a Smart City

“…The idea is to provide the cyclist with some wearable gadgets embedded in his/her clothes (in the gloves or the helmet) that, thanks to a personal area network communication interface, can obtain information from the V-Alert application and alert the cyclist about closing vehicles via some LEDs, sounds, or vibration systems available to the rider depending on the smartphone. Also, the positioning error of the GPS (~5 m) must be fixed, so in future steps position accuracy must be improved by including a Differential GPS system or application [19]. Moreover, we are improving the mobile application algorithm in order to discard the information of those vehicles that will not intersect with the cyclist and are not a risk for him/her.…”

A Custom GPS Recording System for Improving Operational Performance of Aerially-Deployed Herbicide Ballistic Technology

“…developed a Network RTK (NRTK) GPS smartphone application with less than 1 cm horizontal accuracy, less than 3 cm vertical accuracy and 0.71 sec latency times [79].…”