The Global Positioning System (GPS) allows the accurate positioning of an object using satellite signals. There are a lot of applications of this technology in many scientific fields all over the world. The paper focuses on scientific issues related to new application of GPS technology using the effect of Forward Scattering (FS) of electromagnetic waves to detect targets by their GPS radio shadows. The aim of the paper is to make experimental studies of GPS radio shadows of vehicle targets irradiated by GPS signals and to develop algorithm for automatic detection of the shadows of these targets. In this paper, we offer an original approach for using of CFAR techniques for detection of moving targets from GPS radio shadows. The results show that from GPS radio shadows of different objects can be extracted information for classification of objects aimed at transport management or security of zones.

The unauthorized widely used unmanned aerial vehicle UAV (drones) raises serious concerns about the security of infrastructure and people in the settlements. This expansion leads to the need for development of effective systems for their detection and classification. In this article, a drone detection approach based on the detection of the Radio Frequency (RF) emitted during the communication between the drone and its remote controller, is proposed.

In this paper, one possible algorithm for air target detection and velocity estimation in a pulsar FSR system is proposed. In this processing algorithm, one approaches for extraction with nonlinear element of the target signal from the input mixture "direct pulsar signal + reradiated target signal" are studied. The signal processing algorithm is evaluated by computer simulation.

A possible variant of the signal processing for detection of weak pulsar signals is presented in this paper. The signal processing incudes three basic stages: epoch folding, moving average filter with a jumping window and adaptive signal detection. The signal processing proposed in the paper was verified with real experimental signal records from pulsar B0329+54 by the Westerbork Synthesis Radio Telescope in Westerbork, the Netherlands.