SX BLUE GPS iSXblue II+ GNSSTM, Руководство пользователя

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SXblue Series User Manual 47
2. Features and Performance
This chapter describes various operation mode and high-level features of your
SXblue receiver. The remaining chapters provide more detailed information on the
workings of the product.
As mentioned in the previous chapter, if you are new to GPS, SBAS, DGPS, RTK
or Atlas® corrections, we recommend that you consult Appendix B for further
information on these services and technologies.
When powered for the first time, the SXblue receiver will perform a ‘cold start’,
which involves acquiring the available GPS/GNSS satellites in view and the default
differential service.
If you choose to use an external source of RTCM SC-104 correction data, you will
need to ensure that the external source supports an eight data bit, no parity, and
one stop bit configuration (8-N-1) and a baud rate between 4800 and 230400 baud.
2.1 GPS
The following sections describe the general operation of the SXblue receiver
running the MFA (Multi-Function Application firmware).
2.1.1 Satellite Tracking
The SXblue receiver automatically searches for GPS satellites, acquires the signal,
and manages the associated navigation information required for positioning and
tracking. This is a hands-free mode of operation. Satellite acquisition quality is
described as a signal to noise ratio (SNR). A higher SNR is indicative of better
quality signal reception. For the GNSS models, GPS-GLONASS-Galileo-BeiDou
and QZSS1 satellites can be tracked, and
SureTrack Technology will internally
generate corrections for the GLONASS satellites and the SXblue receiver will thus
use all satellites in view to calculate the solution.
Note – The GPS engine is always operating, regardless of the DGPS mode of
operation.
2.1.2 Positioning Accuracy
The SXblue receiver is a sub-meter (horizontally), 95% accurate product under
ideal conditions (minimum error) when using code-phase, centimeter when using
RTK, decimeter/sub-meter when using Atlas services and sub-centimeter when
used in post-processing.