Aiming at the short-coming that most existing false track privacy protection method neglect background knowledge attack and the generated track lack of similarity

a new protection method based on the third party trusted server is proposed. When the client makes a request

firstly

according to the geographical location of the user and the distance constraint of the pseudo location

a suitable pseudo location is generated

and then the constraint of the trajectory similarity is used to make the direction of the generated pseudo trajectory more similar to the direction of the real trajectory. Experiment shows that the algorithm has higher similarity of trajectory direction

less run time

compared with pseudo trajectory algorithm randomly generated. And it can prevent adversarial attacks of background knowledge

and can realize track privacy protection better.