GPS World • July 2022 • SURVEYING

CHC Navigation (CHCNAV) has launched the i73+ pocket-sized GNSS receiver. The i73+ is a compact, powerful and versatile receiver with an integrated UHF modem that can be used either as a base station or rover. Powered by 624 GNSS channels and the latest iStar technology, the i73+ delivers survey-grade accuracy in all jobsite configurations.

“Building on the legacy of the i73 GNSS receiver, the new i73+ receiver is designed to maintain its proven compact and lightweight concept but adds the ability to be operated as either an RTK base station or a rover,” said Rachel Wang, product manager, Surveying and Engineering Division, CHCNAV. “To enable this extra feature, we have built in the latest UHF modem technology, allowing the reception and transmission of RTK corrections without sacrificing receiver size and power consumption.”

The i73+ is a highly productive NTRIP rover when used with a handheld controller or tablet and connected to a GNSS RTK network via CHCNAV LandStar field software.

The integrated, advanced 624-channel GNSS receiver takes advantage of GPS, GLONASS, Galileo and BeiDou, in particular the latest BeiDou 3 signal, and provides robust data quality at all times. The i73+ extends GNSS surveying capabilities while maintaining centimeter-level survey-grade accuracy.

Built-In IMU technology. With its inertial measurement unit (IMU) compensation ready in 3 seconds, the i73+ delivers 3-cm accuracy at up to 30º pole tilt, increasing point measurement efficiency by 20% and stakeout by 30%. Surveyors can extend their working boundary near trees, walls and buildings without the use of a total station or offset measurement tools.

The i73+, weighing only 0.73 kg including the battery, is the lightest and smallest receiver in its class, the company says. It is almost 40% lighter than traditional GNSS receivers and easy to carry, use and operate. The i73+ is packed with advanced technology, fits in one hand and offers high productivity for GNSS surveys.

Tersus GNSS Releases ExtremeRTK White Paper

Tersus GNSS has released a white paper on ExtremeRTK Technology. According to the company, the white paper demonstrates how ExtremeRTK Technology delivers excellent performance in all manner of surveying scenarios and describes its impressive compensated results when performing tilt surveys — even at angles greater than 90°.

As a professional real-time kinematic (RTK) developer and manufacturer, Tersus believes the stability and accuracy of RTK are the cornerstones of RTK measurement.

According to the paper, “ExtremeRTK integrates the receiver’s hardware, high-precision baseband IC [integrated circuit], RTK engine, GNSS/INS coupling algorithm, etc. It enables unprecedented performance stability in challenging environments and prevents occurrences of occasional RTK positioning outliers.”

Tersus starts from scratch — engineering each element from its foundation in the physics of GNSS. From signal capture and baseband tracking engine to position-velocity-time (PVT) results and the overall algorithm of RTK, Tersus completes all algorithm logic independently.

Test results described indicate the remarkable performance of ExtremeRTK technology in RTK initialization, accuracy and tilt compensation. Based on ExtremeRTK, Tersus will continue to invest in the further development of RTK receivers by adding photogrammetry, laser scanning and more.

Meanwhile, Tersus also will focus research and development on professional industry software, the integration of resources in data management, and big-data applications so it can provide users with additional professional services.