Jedrzej Drozdowicz

35 GHz FMCW drone detection system

This paper presents an experimental system dedicated for the detection and tracking of small aerial targets such as Unmanned Aerial Vehicles (UAVs) in particular small drones (multirotors). The system was proposed in response to increasing drone popularity and the related threats. The hardware and software parts of the system are covered, including the analogue front-end, FPGA based pre-processing and PC based processing, detection and tracking. Real life trials are described with promising results provided. Further research on the subject is proposed.

Experimental results of DANIEL-35 SAR system tests

This paper presents results of DANIEL-35 Synthetic Aperture Radar (SAR) system tests carried out recently by the Warsaw University of Technology (WUT) together with the Air Force Institute of Technology (AFIT), Poland. The DANIEL-35 system is a high resolution (up to 15cm), compact SAR radar operating in the 35GHz band. The system has been developed under the framework of a μSAR project founded by the Polish National Centre for Research and Development (NCBiR). The goal of this project is to develop a multiplatform SAR system dedicated for ground surface monitoring. The preliminary results obtained from the various system tests, including recent trials where a small plane was used as a radar carrier, are presented in this paper.

Micro-range, micro-Doppler joint analysis of pedestrian radar echo

We present in the paper results of a generalised micro-Doppler analysis that is suited to high range resolution radar. The target echo energy is here represented in the three dimensional space of time, Doppler, and additionally range, what can provide more information on target micro-motion than the standard micro-Doppler analysis which is performed in the time-Doppler plane. The analyzed signals were recorded with a Ka-band FMCW radar of a high 1GHz bandwidth, which could provide good resolution in range, time and velocity. Here, we present a new method to visualize jointly micro-range and micro-doppler effects of a running man observed on the background of ground interferences.

Towards a mobile low-terahertz SAR imaging radar — Limitations and prospects

In this paper a system for radar measurements using a low terahertz frequency band is presented. The architecture of the system is briefly described and some preliminary results obtained with the developed system are attached. A concept to rebuild this system for outdoor radar experiments is presented and the design process described, with an emphasis on the design challenges. Design choices regarding signal generators and recorders, analog intermediary circuitry, and the navigation system are discussed in this paper.

The use of FPGA evaluation board as data acquisition and pre-processing system for Synthetic Aperture Radar

Experiments on Synthetic Aperture Radar require a data acquisition and storage system. Custom-made systems are well suited to this specific application, but the development of such a system is both time and resource consuming. The use of an off-the-shelf FPGA evaluation board with interchangeable analogue to digital converter cards as a data acquisition and pre-processing system was proposed. Such an approach allows not only for operation with different analogue front-ends, but also for the implementation of data pre-processing, such as modulation and decimation. The modulation makes further processing easier and the filtration-decimation reduces the size of the data stream. A complete system was tested thoroughly during a ground-based experiment and is now ready for airborne testing. As there are unused resources in the FPGA, they will be utilized in the future for the implementation of real-time processing.

IEEE 802.15.4 compliant in-building wireless sensor network

An increasing number of wireless networks operate in indoor environments nowadays. In this paper the development of a wireless sensor network with the goal of network flexibility, energy efficiency and versatility is presented. The proposed network supports transmission in 868 MHz or 2.4 GHz frequency bands, in accordance with the IEEE 802.15.4 standard. The performance of the network was tested in both outdoor and indoor environments. The quality of indoor transmission in both frequency bands (868 MHz and 2.4 GHz) was experimentally checked and compared to the results from another system operating in the 433 MHz frequency band in the same scenario.

Moving target imaging using dual-channel high resolution 35 GHz SAR radar

This paper presents the ground moving target imaging algorithm for dual-channel high resolution SAR images. The algorithm is thoroughly described, including target detection, extraction, imaging and velocity estimation. Selected results of the real airborne mission are presented and further research and improvements are proposed. The radar system used and the test scenario are also briefly described to provide deeper understanding of the results.

Implementation of a real-time unfocused SAR algorithm using various computing platforms

This paper presents the comparison of three implementations of an unfocused SAR algorithm in various platform variants. The first presented solution was implemented using G programming language LabVIEW and GPU toolkits for efficient computations on graphical processor. The others two implementations were written in C++ with CUDA tools and two different computing platforms. The main aim was to create the implementation capable to perform real-time computations using simplified unfocused SAR algorithm. The presented solutions were tested on real radar data collected during SAR campaign using small aircraft as a radar carrier. This work is a backend to create an UAV-based small and light SAR system with real-time on-board capabilities.

Ground Moving Target Indication in high resolution Synthetic Aperture Radar imaging— a comparison of selected algorithms

In this article three GMTI (Ground Moving Target Indication) algorithms are presented. The algorithms are based on ATI (Along Track Interferometry) signal and show different approaches to moving target indication. The details of each algorithm and results of real radar data processing are presented. Computational complexity of each algorithm is discussed. Plans for future research are outlined.

Three-dimensional imaging of a rotating airborne target using bistatic inverse synthetic aperture radar

In this paper a proof-of-concept of three-dimensional inverse synthetic aperture radar (ISAR) imaging of a rotating airborne target is presented. The authors describe an attempt to obtain 3D imaging of a moving airplane in a bistatic situation. The simulation scenario is presented and the imaging results are depicted. The results are commented on and conclusions drawn.