GPS World

Tag: GNSS L1 receiver

  • 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.

  • Samsung Introduces 5-nm processor with GNSS for wearables

    Samsung Introduces 5-nm processor with GNSS for wearables

    The Exynos W920 offers high performance, efficiency and LTE connectivity in tiny form factor

    Image: Samsung
    Image: Samsung

    Samsung Electronics is offering a new processor for wearables, the Exynos W920. The new processor integrates an LTE modem and is built with an advanced 5-nanometer (nm) extreme ultraviolet process node, offering powerful yet efficient performance demanded by next-generation wearable devices.

    The Exynos W920 is embedded with a GNSS L1 receiver (GPS, GLONASS, Beidou, Galileo) for tracking speed, distance and elevation during outdoor activities. It also has a 4G LTE Cat. 4 modem.

    “Wearables like smartwatches are no longer just a cool gadget to have. They’re now a growing part of our lifestyles to keep you fit, safe and alert,” said Harry Cho, vice president of System LSI marketing at Samsung Electronics. “With the Exynos W920, future wearables will be able to run applications with visually appealing user interfaces and more responsive user experiences while keeping you connected on the go with fast LTE.”

    The Exynos W920 has two Arm Cortex-A55 cores for high-performing, power-efficient processing and an Arm Mali-G68 GPU with CPU performance improved by 20 percent and 10 times better graphics performance than its predecessor. With upgraded cores and improved performance, the Exynos W920 enables faster application launches and more interactive, eye-catching 3D graphical user interface (GUI) on a device’s qHD (960×540) display.

    The Exynos W920 comes in a tiny package with Fan-Out Panel Level Packaging (FO-PLP). The technology incorporates the Exynos W920, power management IC and embedded multimedia card. The processor’s compact size allows smartwatches to house larger batteries or have sleeker designs.

    Always-on-display (AOD) for wearables, especially for smartwatches, is a widely adopted feature as it makes it effortless to take a quick look at the time, notifications, missed calls and more without the need to wake the watch up from sleep mode. Rather than powering up the main CPU, the W920 activates a dedicated low-power display processor, the Cortex-M55, reducing display power consumption under AOD mode compared to its previous Exynos model.

    The Exynos W920 supports a new unified wearable platform Samsung built jointly with Google, and will be first applied to the upcoming Galaxy Watch model.