SX BLUE GPS iSXblue II+ GNSSTM, Руководство пользователя

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SXblue Series User Manual 68
The SXblue receiver supports a variety of standard and proprietary NMEA
messages. These messages are used to configure the receiver and also contain
the required information from the SXblue receiver. You may configure a selection
of NMEA 0183 data messages on one port at various update rates (each message
has a maximum update rate) and a different selection of NMEA 0183 messages
with different rates on the other port.
Technical Reference Manual presents information relating to the NMEA interface
of the SXblue receiver. Appendix C - Resources provides contact information,
should you wish to purchase a copy of the NMEA 0183 standard.
3.1.2 Binary Interface
Binary messages may be output from the SXblue receiver simultaneously as
NMEA 0183 data. Binary messages have a proprietary definition and would likely
require custom software support if you wish to use them. Binary messages are
inherently more efficient than NMEA 0183 and would be used when you require
maximum communication efficiency. Use of binary messages for most users is
not recommended - the NMEA interface allows you to control the operation of the
SXblue and also receive most types of information regarding status and positioning
information.
Note – If you wish to log binary data, please ensure that your logging
software has opened the file as a binary file, otherwise you may lose data.
3.1.3 RTCM SC-104 Protocol
RTCM SC-104 is a standard that defines the data structure for differential
correction information for a variety of real-time differential correction applications.
It has been developed by the Radio Technical Commission for Maritime services
(RTCM) and has become an industry standard for communication of correction
information. RTCM is a binary data protocol and is not readable via a terminal
program. It appears as ‘garbage’ data on-screen since it is a binary format and
not ASCII text. The following is an example of how the RTCM data appears on-
screen:
mRMP@PJfeUtNsmMFM{nVtIOTDbA^xGh~kDH`_FdW_yqLRryrDuhcB\@}N`ozbSD@O^}
nrGqkeTlpLLrYpDqAsrLRrQN{zW|uW@H`z]~aGxWYt@I`_FxW_qqLRryrDCikA\@Cj]DE]|
E@w_mlroMNjkKOsmMFM{PWDwW@HVEbA^xGhLJQH`_F`W_aNsmMFM[WVLA\@S}a
mz@ilIuPqx~_IZhTCpLLrYpdP@kOsmMFM[kVDHwVGbA^P{WWuNt_SW_yMsmMnqdrh
cC\@sE^ZfC@}vJmNGAHJVhTCqLRryrdviStW@H_GbA^P{wxu[K
RTCM has various levels of detail; however the highest level is the message.
RTCM defines numerous messages that contain specific information. The SXblue
receiver supports more advanced methods of differential positioning, such as real-
time kinematic (RTK) that uses different standard RTCM message types. The