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High accuracy sub-meter positioning
Many industrial and leisure applications require higher accuracy than traditional GNSS provides, for example mapping, agricultural uses, marine navigation, construction, open-sky warehouse management and location- based recreational applications such as geocaching and handheld golf rangefinders.
In some of these applications, Real Time Kinematic (RTK) or post-processing can be used to achieve accuracy to millimeters at the cost of time or deployment of a local reference receiver. A much lower-cost solution is based on Precise Point Positioning (PPP), a method that performs precise position determination to within a meter using a single receiver.
u-blox’ PPP technology is made possible by stabilizing measurements of the distance between GNSS satellites and the receiver (pseudo-ranges) using carrier phase tracking. Additional accuracy is achieved from ionospheric correctional data received from satellite-based augmentation systems, such as WAAS (USA), EGNOS (Europe), MSAS (Japan) and upcoming GAGAN (India).
u-blox has implemented PPP in its NEO-7P GNSS module, which also supports RTCM D-GPS in standard point-positioning mode for survey use. This stand-alone high-precision implementation requires no reference receiver deployment, is delivered as a compact (12.2 x 16.0 x 2.4 mm LCC) product, and integrates easily with u-blox wireless modules to support high-accuracy telematics applications.