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aspects, respectively:
TTL level pin definition:
Pin GPS_REC receives the standard serial port data of the TTL level output from
GPS module;
Pin GPS_PPS receives the positive TTL synchronous pulse signal output by the
GPS module;
RS232 pin definition:
Pin GPS_REC receives the standard serial data of the R232 level output from the
GPS module;
Pin GPS_PPS receives the positive synchronization pulse signal output by the
GPS module, and the level is required to be 3.0V~15.0V.
If the GPS you use outputs according to the RS232 serial port protocol, and the
lidar receives data according to the TTL protocol, then a RS232 to TTL
conversion module is needed.
The GPS equipment is time-synchronized to mark and calculate the precise
emission and data measurement time of each laser. The precise time of the lidar
point cloud can be matched with the pitch, roll, yaw, latitude, longitude and
height of the GPS/inertial measurement system.
The default serial configuration baud rate of the GPS data output received by
the lidar is 9600, 8N1. The PPS high pulse width is required to be more than 1
ms.
The standard format of the GPRMC information is as follows:
$GPRMC, <1>, <2>, <3>, <4>, <5>, <6>, <7>, <8>, <9>, <10>, <11>, <12> *hh
Table 6.1 The Standard Format of GPRMC Information
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