Tracking the Mobile Jammer Continuously in Time by Using Moving Vector

In wireless sensor network, due to the shared wireless medium, wireless jamming attacks are easy to be launched by continuously injecting false messages. Such jamming attacks can eliminate the network capacity to execute its expected function. The methods of detecting and localizing the jammer are widely used to deal with such attacks. However, when the jammer is mobile, a jammer tracking method which can localize the jammer with little effort is significant for performing some anti-jamming techniques. In this paper, we propose a moving vector based jammer tracking method. In our proposed method, once the mobile jammer is active, the initial position of jammer can be obtained by any jammer localization algorithm. Then, a approximate moving vector of jammer is calculated at each following time. And the position of jammer at current time can be estimated as the sum of the position at last time and the moving vector. In order to improve the accuracy of tracking results, two improved schemes are also proposed in this paper. We simulate our methods in MATLAB. The experimental results suggest that our methods are effective and they are sensitive to the number and distribution of sensor nodes. Also, the tracking results generated by our methods are more accurate than some existing solutions and our methods are lightweight to produce fewer additional overhead.