Electrical Engineering-Systems Dept.

סמינר

Alon Sidi

(M.Sc. student under the supervision of Prof. Anthony J. Weiss)

on the subject:

Tracking of a Moving Emitter Based on Delay and Doppler Shift Using a Particle Filter

We address the problem of localization of a moving radio emitter. The problem of emitter location attracts much interest in the Signal-Processing, Radar, Sonar, Bioengineering, Seismology and Astronomy literature. Emitter location techniques are currently used for many applications such as homeland security, emergency cellular phone location, law enforcement, radio spectrum monitoring, medical imaging, wildlife migration research, etc.

The localization process is based on the exchange of signals between the emitter and a number of reference stations whose locations and velocities are known. There are mainly two types of positioning schemes: (1) self-positioning, where the emitter position is determined based on the transmitted signal from the stations (such as the GPS system); (2) remote-positioning, where the system determines the emitter position. This research focuses on the second scheme, where the reference stations intercept the emitter’s signal and the use of these samples to extract position/velocity information.

Two-step conventional methods measure time difference of arrivals and differential Doppler from the samples in the first step, and in the second step use these measurements for geolocation and tracking. We present a novel approach based on a particle filter that uses the received radio signal directly in order to determine the location and velocity of the transmitter. Two algorithms are derived for the case of unknown transmitted signals and for the case of random Gaussian transmitted signals. In addition, we derive recursive performance bounds for the two cases. The proposed methods show better performance than two-step methods at low SNR values and achieve the performance bound at high SNR values.