matlab_gps_example.m

matlab开发的GPS信号simulator

% Create a serial port object.
obj1 = instrfind('Type', 'serial', 'Port', 'COM4', 'Tag', '');

% Create the serial port object if it does not exist
% otherwise use the object that was found.
if isempty(obj1)
obj1 = serial('COM4');
else
fclose(obj1);
obj1 = obj1(1);
end

% Set the BaudRate
obj1.BaudRate = 4800;

% Connect to instrument object, obj1.
fopen(obj1);

% We only want the strings with $GPGLL