GPS World

Tag: field test

  • OneNav completes pureL5 field test using customer evaluation system

    OneNav completes pureL5 field test using customer evaluation system

    The commercially available L5-only GNSS solution includes machine-learning algorithms to leverage increased L5 signal-ranging precision in challenging signal conditions.

    oneNav logoOneNav has announced performance results from field testing its latest pureL5 customer evaluation system (CES) software in both open-sky and challenging signal environments.

    The patent-pending oneNav GNSS system, including a custom array processor and a library of machine-learning algorithms, demonstrated consistent sub-meter accuracy and rapid time-to-first-fix (<2 sec) in open-sky testing.

    In very challenging urban and deep urban canyon environments, the pureL5 CES field-test equipment outperformed the commercial precision L1 GNSS unit against which it was compared, demonstrating tracking of satellite signals as weak as –160 dBm.

    The oneNav system was able to acquire directly and track L5 signals in all environments with no L1 receiver present, greatly simplifying the RF front end and antenna subsystem and making the pureL5 solution suitable for space- and power-constrained mobile and internet of things (IoT) devices requiring reliable high performance.

    Results of a representative urban drive test route are shown below (the map describes the route driven). During this test, the CES and the commercial precision L1 receiver were both connected to a common antenna, fixes were taken once/second, and the results were compared to a common ground truth position. On average, the oneNav system demonstrated a 55% improvement in accuracy over the precision.

    Image: oneNav
    Image: oneNav

    OneNav’s family of  algorithms improves pureL5 system performance by predicting whether the received signal is line of sight (LOS) and correcting non-line-of-sight (NLOS) signals to increase the number of measurements available for accurate positioning.

    The pureL5 algorithms characterize signal and multipath environments. Accordingly, algorithms developed in one deep urban area can be used to mitigate multipath in areas geographically different, but that present similar multipath signatures. This obviates the need for field-test teams to collect data in thousands of urban areas around the globe.

  • Autotalks expands in China after C-V2X field test

    Autotalks, a V2X (vehicle-to-everything) communication company, is gaining momentum in the Chinese market following the successful completion of the C-V2X field test with a Chinese technology giant.

    The field trial evidenced Autotalks’ C-V2X capabilities on a public road, including 3GPP release 15 compliant transmit diversity, and remarkable communication range of over 2 kilometers with a nominal range of over 1.5 kilometers.

    As part of its momentum in China, Autotalks is growing its Chinese partner ecosystem and hiring for its operation in this giant market. Autotalks is a member of IMT-2020, CAICV and China ITS Industry Alliance, working on standardization and testing of C-V2X towards mass deployment. The company has also launched a Chinese website.

    China is a fast-growing region in the automotive and intelligent transportation systems (ITS) segments. LTE-V2X technology has been gaining strong momentum in China. In November 2018, Autotalks announced that it has recruited Xiaobing Yang, to lead Autotalks’ business development efforts in China out of Autotalks’ new branch in Beijing. Yang brings to Autotalks more than 25 years of experience in the Chinese telecom industry.

    In 2018, Autotalks launched a global V2X solution supporting both DSRC and LTE-V2X (also known as C-V2X) based on its second-generation mature chipset with the intention of expanding its global footprint into China. Autotalks’ LTE-V2X direct communications (PC5) solution is separated from the cellular Network Access Device (NAD), resulting in a secure and cost-effective standalone LTE-V2X solution.

    Autotalks announced in February that it has partnered with MediaTek. a global fabless semiconductor company that enables 1.5 billion connected devices a year. The two companies are cooperating on integrating V2X and telematics and have completed a joint reference design for Telematics Control Unit (TCU) integrated with a global V2X chipset.

    The reference design is based on Autotalks’ global V2X chipset and MediaTek’s newest technology, an automotive-grade cellular modem SoC, enabling a secure, robust and cost-effective global TCU architecture.