Truck freight activity mode estimation method based on GPS and sampling investigation

The invention provides a method for estimating a freight transport activity mode of a truck based on a GPS (Global Positioning System) and sampling survey. Acquiring GPS historical data of the researched truck object, performing sampling investigation on the researched truck, and determining the category of the goods transported by the truck and the activity type of the truck at the parking point; according to truck GPS data, the parking time of each truck at an effective parking point and the distance from the truck to the parking point are calculated, and then probability distribution parameters of the truck are estimated respectively; the probability that the truck is engaged in a certain specific activity at the effective parking point is calculated; then correcting the probability that the truck is engaged in freight related activities at the parking point; and determining a freight activity travel chain of the truck, namely the freight activity mode of the truck. According to the method, multivariate da