User's Manual

Table Of Contents

PXS8 Hardware Interface Description

4 GNSS Receiver

PXS8_HD_v03.000 Page 29 of 41 2012-11-30

Confidential / Preliminary

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4 GNSS Receiver

PXS8 integrates a GNSS receiver that offers the full performance of GPS/GLONASS technol-

ogy. The GNSS receiver is able to continuously track all satellites in view, thus providing accu-

rate satellite position data.

The integrated GNSS receiver supports the NMEA protocol via USB or ASC0 interface

. NMEA

is a combined electrical and data specification for communication between various (marine)

electronic devices including GNSS receivers. It has been defined and controlled by the US-

based National Marine Electronics Association. For more information on the NMEA Standard

please refer to http://www.nmea.org.

Depending on the receiver’s knowledge of last position, current time and ephemeris data, the

receiver’s startup time (i.e., TTFF = Time-To-First-Fix) may vary: If the receiver has no knowl-

edge of its last position or time, a startup takes considerably longer than if the receiver has still

knowledge of its last position, time and almanac or has still access to valid ephimeris data and

the precise time.

By default, the GNSS receiver is switched off. It has to be switched on and configured using

AT commands. For more information on how to control the GNSS interface via the AT com-

mand AT^SGPSC see [1].

Using the serial ASC0 interface NMEA data is transmitted at a fixed speed of 115200bps.