What work have you done?

Have you managed to notice exactly what 8051 chip you have?

Have you retrieved the documentation for it?

Have you retrieved the datasheet for the GPS?

Have you compared the voltage levels for the GPS interface, and compared with the voltage levels used by your 8051 chip?

Have you read the 8052 FAQ pages on this site?

Have you looked at the example code in the Code Library section?

Have you figured out what you should do with the NMEA data you probably receive from the GPS? Exactly how did you plan to use this for your autonomous robot?

Note that the GPS coordinates normally have a jitter of 10m and you will often fail to get enough satellites indoors - do you have a big open landscape for your robot to rove around on?

Should we come and solder too?

If you eagerly awaits pre-chewed code to interface the GPS with the 8051 - where did you get the code that made your robot autonomous in the first place?