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This study was carried out for the development of the robust navigator, which is used as a positioning system for precision farming by developing an H/W (Hardware). The H/W is composed of plural GPS receivers and simulating algorithm for the correction and integration of positioning signals. A tracking test was performed in a 50X22m plaza. An RT-2 GPS receiver (NovTel Co., Accuracy = 2cm(rms)) was mounted on a tractor for measuring traveling trace. There were many obstacles which could interfere with delivering radio frequency in the traveling path, but the perceived error deviation of the positioning data processed by the algorithm was less than 1.5m.