The increase in the variety of vehicles and the rising demands on advanced driver assistance systems (ADAS) and autonomous driving lead to ever higher development requirements. As a result, post-processing is playing an increasingly important role in the automotive industry. The precision of the ADMA is limited by the quality of the IMU and the duration of a GNSS outage. The performance of the system can be greatly improved through post-processing. In doing so, ADMA-PP further reduces the position solution drift during GNSS outage and provides a step-free solution. To achieve this, the ADMA-PP calculates the input data in the time domain forward and backward and combines both results.