MATLAB解析GPS数据程序文档格式.docx
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%串口翻开失败时使用此句
%delete(s);
clears%串口翻开失败时使用此句
serial3=serial('
COM3'
);
%串口设置
serial3.BytesAvailableFcnMode='
byte'
%serial3.InputBufferSize=38400;
%输出波特率
serial3.BaudRate=BaudRate;
%读入波特率
%serial3.OutputBufferSize=1024;
serial3.BytesAvailableFcnCount=BytesAvailableFcnCount;
serial3.ReadAsyncMode='
continuous'
serial3.Terminator=Terminator;
%%翻开串口
count_opentimes=1;
whilecontains(serial3.status,'
closed'
)>
0&
&
count_opentimes<
num_MaxTry
fopen(serial3);
%翻开串口
count_opentimes=count_opentimes+1;
end
ifcontains(serial3.status,'
open'
)<
1
disp('
opencomfailed!
'
return
%%读取并处理数据
%初始化
GPS_Data=GPS_Init();
while(num_execute>
0)
GPS_DataStrs=fread(serial3,num_SingleRead,'
char'
%一次读出10个字符
GPS_DataStrs=reshape(GPS_DataStrs,1,[]);
GPS_DataStrs=split_str2strs(GPS_DataStrs);
GPS_Data_tmp=get_GPS_specificData(GPS_DataStrs);
GPS_Data=Updata_GPU_Data(GPS_Data,GPS_Data_tmp);
show_GPS_Data(GPS_Data);
pause(Timedelay);
%延时
num_execute=num_execute-1;
%fprintf(s,'
abcd'
%给串口的发送数据
%fscanf(s);
%从串口的接收缓存读数据
%%关闭串口并删除相关数据
fclose(serial3);
%关闭串口
delete(serial3);
clearserial3
%%
%将字符串根据'
\r\n'
划分成多个子字符串,同时去掉首尾无用的剩余字符串
functionout_strs=split_str2strs(StrData)
ifcontains(class(StrData),'
)
uint8(StrData);
end
record=get_pos_enterflag(StrData);
ifStrData
(1)==uint8('
$'
)%开头为'
的情况
flag_start=1;
else
ifsize(record,2)>
0
flag_start=record
(1)+2;
out_strs=cell(0,0);
ifStrData(end)==13
flag_end=length(StrData)-1;
flag_end=record(end)-1;
ifflag_start>
=flag_end
StrData=StrData(flag_start:
flag_end);
%截取有效数据,方便下面划分子字符串
num_strs=size(record,2)+1;
out_strs=cell(num_strs,1);
ifnum_strs>
out_strs{1,1}=char(StrData(1:
record
(1)-1));
ifnum_strs==2
out_strs{num_strs,1}=char(StrData(record
(1)+2:
end));
fori=2:
num_strs-1
out_strs{i,1}=char(StrData(record(i-1)+2:
record(i)-1));
out_strs{num_strs,1}=char(StrData(record(i)+2:
out_strs{1,1}=char(StrData);
%得到字符串中'
在字符串中的位置(实际为'
\r'
的位置)
functionrecord=get_pos_enterflag(data)
record=[];
%记录回车符号位置
forii=1:
length(data)-1
ifdata(ii)==13
ifdata(ii+1)==10
record=[record,ii];
ii=ii+1;
%得到具体GPS结构体数据
functionGPS_Data_tmp=get_GPS_specificData(StrsData)
GPS_Data_tmp=[];
num_str=size(StrsData,1);
fori=1:
num_str
str_tab=StrsData{i,1};
ifcontains(str_tab,'
GGA'
GPS_Data_tmp=GNGGA(str_tab);
elseifcontains(str_tab,'
GSA'
GPS_Data_tmp=GNGSA(str_tab);
GSV'
GPS_Data_tmp=GNGSV(str_tab);
RMC'
GPS_Data_tmp=GNRMC(str_tab);
VTG'
GPS_Data_tmp=GNVTG(str_tab);
GLL'
GPS_Data_tmp=GNGLL(str_tab);
%GPS字符串解析
functionGPS_Data_tmp=GNGGA(str_tab)
index=strfind(str_tab,'
'
count=1;
Time=str_tab(index(count)+1:
index(count+1)-1);
count=count+1;
Latitude=str_tab(index(count)+1:
=str_tab(index(count)+1:
Longitude=str_tab(index(count)+1:
%other=str_tab(index(count)+1:
end);
%进一步处理
=Time(1:
2);
=Time(3:
4);
=Time(5:
6);
=Time(8:
10);
=Latitude(1:
%纬度
=Latitude(3:
tmp=str2double(Latitude(6:
9));
tmp=tmp*6/1000;
%tmp=tmp/10000*60;
=num2str(floor(tmp));
=num2str((tmp-floor(tmp))*10000);
=Longitude(1:
3);
%经度
=Longitude(4:
5);
tmp=str2double(Longitude(7:
10));
%UTC时间转换为北京时间
hour=;
ifstr2num(hour)+8>
=24
=num2str(str2num(hour)+8-24);
=num2str(str2num(hour)+8);
functionGPS_Data_tmp=GNGSA(str_tab)
functionGPS_Data_tmp=GNGSV(str_tab)
%此语句为与卫星有关的信息〔包括卫星方位,卫星编号〕
%暂时用不着,不处理
functionGPS_Data_tmp=GNRMC(str_tab)
Date=str_tab(index(count)+1:
=Date(1:
=Date(3:
=Date(5:
functionGPS_Data_tmp=GNVTG(str_tab)
functionGPS_Data_tmp=GNGLL(str_tab)
%更新获取到的相关数据
functionGPS_Data=Updata_GPU_Data(GPS_Data,GPS_Data_tmp)
%用不到的数据可以注释掉
ifisfield(GPS_Data_tmp,'
Time'
)==1
=;
DATE'
Latitude'
LatitudeDir'
Longitude'
LongitudeDir'
GPSState'
SatelliteNum'
speed'
velocity'
LocationState'
altitude'
CurState'
LocationMode'
HDOP'
VDOP'
PDOP'
TrueDir'
MagneticAngle'
MagneticDir'
ReferenceTrueDir'
RelativeDir'
ReferenceRelativeDir'
step'
stepflag'
PRN'
%显示相关GPS数据
functionshow_GPS_Data(GPS_Data)
DataA