Performance Analysis of Code-based Relative GPS Positioning as Function of Baseline Separation**This work was supported by the Coordination for the Improvement of Higher Education Personnel (CAPES), under grant 88881.169927/2018-01, the Brazilian Agricultural Research Corporation (EMBRAPA), under grant 212-20/2018, the Minas Gerais Research Foundation (FAPEMIG), under grant CAG-APQ-01449-17, and the National Council for Scientific and Technological Development (CNPq), under grant 313160/2019-8 Development (CNPq), under grant 313160/2019-8.