GNSS Differential Interferometer

Abstract: Baseline azimuth calculation using GPS carrier phase data can be achieved in a classic way by using two or more geodetic synchronized GPS receivers. Such system includes dedicated expensive components and thus is not applicable to many uses. The development of low cost GPS receivers have come to a point where good quality carrier phase measurements are available and double differencing systems utilizing these receivers have proven feasible. Inexpensive receivers like this, combined with attitude determination algorithm, can make accurate attitude determination using GPS accessible to everyone. Our project consisted of developing a low cost attitude determination system utilizing 2 Fastrax off-the-shelf receivers. Phase and code data from the receivers is processed, filtered and used for attitude determination using double-difference algorithm. Possible applications for such systems are for example: * Civilian - search and rescue equipment * Industrial - low cost geodetic measurement * Military - inexpensive weapon guidance system