Holux UB-93 GPS module and GPS active internal antenna

[Protokov]

Hi everyone !
I'm a student and I currently working on my project. One part of my project is to build a GPS board based on GPS module. I bought a Holux UB-93 GPS module and a GPS active internal antenna (similar to **broken link removed** ). I started to design my GPS board but now i got stuck. UB-93 specification indicate that UB-93 need an antenna (active or passive) to operate but it didn't mention how to connect an active antenna to UB-93. I read in this specification that pin 18 and 19 are used to interact with active antenna only but i don't know how to use those or their functions ?
This is my first time working with GPS and i really need advices or documents from whoever know about GPS and GPS antenna.
Thanks everybody !

 

[longtu]

Hi everyone !
I'm a student and I currently working on my project. One part of my project is to build a GPS board based on GPS module. I bought a Holux UB-93 GPS module and a GPS active internal antenna (similar to **broken link removed** ). I started to design my GPS board but now i got stuck. UB-93 specification indicate that UB-93 need an antenna (active or passive) to operate but it didn't mention how to connect an active antenna to UB-93. I read in this specification that pin 18 and 19 are used to interact with active antenna only but i don't know how to use those or their functions ?
This is my first time working with GPS and i really need advices or documents from whoever know about GPS and GPS antenna.
Thanks everybody !

1. Using External or Internal antenna: You can use external or internal antenna for GPS module. I had tested with both antenna and the result is very good.

 

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2. Schematic interface between UB-93 GPS module and microcontronller:
Note: You can use external or internal antenna with this schamatic.

 

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3. How to extract datas from GPS with microcontroller:
EX data: $GPRMC,220516,A,5133.82,N,00042.24,W,173.8,231.8,1 30694,004.2,W*70

char GPSbuffer[70];
char GPRMC[6]={"$GPRMC"};//Nếu muốn lấy chuỗi data ta GPRMC
char Comma_position[13];
int8 check= 0;
/* Find comma in GPS datas -------------*/
Void FindComma()
{
int8 i, counter= 0;
for(i= 0;i<70; i++)
{
if(GPSbuffer== ',' )
Comma_position[counter++]= i;
}
}
/*Received data from GPS module: ------------*/
#INT_RDA
Void Receive_GPSbuffer()
{
char c;
c= getc();
if(check == 69) return;
GPSbuffer[check++]= getc();
if(check<7)
{
if((GPSbuffer[check-1]) != (GPRMC[check-1]))
check= 0;
}
}
Void TimeGPS()//Vi dụ mang tính minh họa lấy thời gian từ GPS module.
{
char i;
i= Comma_position[0]; //ngay sau vị trí dấu , đầu tiên là thông tin THOI GIAN
printf("TIME(HHMMSS): %c%c:%c%c:%c%c\r\n",GPSbuffer[i+1],GPSbuffer[i+2],
GPSbuffer[i+3],GPSbuffer[i+4],
GPSbuffer[i+5],GPSbuffer[i+6]);

delay_ms(10);
}
Void LatitudeGPS()
{
char i;
i= Comma_position[2];
...
}
Vode LongitudeGPS()
{
char i;
i= Comma_position[4];
...
}
Void GetData()
{
FindComma();
TimeGPS();
LatitudeGPS();//*Sau dấu "," thứ 2: thông tin Latitude
LongitudeGPS();//*Sau dấu "," thứ 4: thông tin Longitude
//...
check= 0;//The next get GPS datas.
}

void main()
{
if(check == 69) GetData();
}

 

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4. PCB Layout Recommandation for RF signal