data interpolation every two seconds

Hello. My sample data is constructed the structure type of Matlab. My data description is as follows; The contents of sample data are ship’s data(date, time, longitude, latitude, speed, course) according to each ship id(MMSI). The time interval of ship’s location is 2~35 second(less than 180 second). So, that’s why ship’s data was interpolated per second using my matlab code. However, the interpolated data was changed to bigger size than the original data. Therefore, I want to interpolate the data every two second(even number). This is my project. I attatched my matlab code and powerpoint on this freelancer. I shared you my [login to view URL] on google drive. [login to view URL] Thank you