GPS World

Tag: pureL5

  • 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.

  • OneNav announces pureL5 GNSS digital IP core

    OneNav announces pureL5 GNSS digital IP core

    The PureL5 Customer Evaluation System is being tested by California and Chinese companies

    oneNav logoOneNav has announced the commercial availability of its pureL5 GNSS digital IP core.

    The pureL5 digital IP core’s architecture enables it to directly acquire and track L5 signals from GPS, Galileo, BeiDou, QZSS and GLONASS without any L1 aiding. This eliminates the entire L1 RF chain, saves space on the printed circuit board, and simplifies the RF front-end and antenna subsystem in smartphones, wearables and trackers.

    The pureL5 digital IP core’s massively parallel array processor searches the entire 1-millisecond L5 code space in parallel, delivering 1 second time to first fix (TTFF). The pureL5 digital IP core is 0.28mm2 in the 3-nm semiconductor process and consumes 4.7 mW of power in 1-Hz tracking mode.

    OneNav has delivered the pureL5 digital IP core register-transfer level (RTL) to its first system-on-chip (SOC) customer. IP core RTL verification and physical implementation are complete, and oneNav’s SOC licensee will tape out in the first quarter of this year. The pureL5 digital IP core RTL is available for customer licensing and shipment now.

    Customer Evaluation System. OneNav’s pureL5 Customer Evaluation System is being tested by companies in California and China. The system is available for smartphone and wearable OEMs and SOC providers who want to evaluate oneNav’s pureL5 in the field and the lab.

    PureL5 GNSS Features

    • Smaller footprint than L1+L5 hybrids, simplifying implementation in highly space-constrained devices such as 5G smartphones and wearables
    • Lowers bills of material (BOM) cost and simplifies the RF front-end and antenna subsystem by eliminating the entire L1 RF chain
    • No L1 aiding required: directly acquires L5/E5/B2 with 1-second TTFF
    • Less software complexity, simplifies RF coexistence engineering
    • Better interference resiliency
    • Scalable IP signal processing core is semiconductor process-node independent
    • Multi-constellation L5: Beidou, Galileo, GPS, QZSS, GLONASS.