A Fast Integer Ambiguity Repair Method for the Land Vehicle Attitude Determination Using GPS

The integer ambiguity needs re-computation when cycle slips occur in the carrier phase signal during attitude determination using global positioning system (GPS). This paper presents a new method for fast integer ambiguity repair for land vehicle application. The velocity vector is utilized to obtain the baseline vector when cycle slips occur. And then observation equations are solved with the obtained baseline vector for the float ambiguity solution which can be used as a constraint condition to accelerate the integer ambiguity search procedure at next epochs. Experimental results demonstrate that the proposed method gives a fast approach to obtain new fixed ambiguities while the regular method takes longer time and sometimes results in incorrect solutions.