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When a massive multiprocessor, such as Graphics Processing Unit, is used for radar signal processing, it achieves its peak performance only with a large amount of data buffering. This causes a significant delay between the actual transmit-receive event and the appearance of detection and/or estimated parameters of an object at the processor output. The paper is aimed at assessing the influence of...
Most of PCL algorithms require clear, non channel-distorted reference signals. However radar systems operate under various environmental circumstances, including dense, multi-path urbanized areas. GSM transmission has built-in mechanism to estimate and overcome multi-path effect. It is good enough for demodulation however not sufficient for PCL applications. The paper presents SVD (Singular Value...
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...
A Wi-Fi based passive radar can be used for localization of objects in the vicinity of several access points, which are used as illumination sources. However, the transmission of Wi-Fi signal is not continuous — the activity of access points depends on the transmitted data and is totally unpredictable from the passive radar point of view. As a result, the ability to detect and measure an object using...
The basic method of passive coherent localization takes advantage of TDOA measurements. However, some illuminators of opportunity emit a narrowband signal which makes the resolution of signal arrival time measurements very poor. Then, the Doppler information can be helpful to increase localization precision or provide sufficient information for localization by itself. The paper presents a new, geometry-based...
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...
The localization in a classical multistatic passive radar is based on finding bistatic ellipsoid crossing with at least three pairs of transmitter-receiver. The localization accuracy is dependent on the geometry and bandwidth of the illumination signal. For narrow band signals like GSM cellular phone transmission the bistatic range resolution is very poor, in a range of several kilometers. The paper...
A passive radar is a radar which uses external noncooperating transmitter0s (e.g. FM radio or GSM) to illuminate the target. Typical passive radar receiver benefits from its long integration time with a good velocity (Doppler frequency) estimation accuracy, while ?? especially for a GSM-based radar ?? the range measurement accuracy may be poor. This paper presents a study of Doppler-only tracking...
In this paper results of an experiment using a multistatic passive radar system based on packet wireless network illuminators are presented. The network consists of several transmitters/receivers that operate on the same channel and exchange data with each other. The passive radar listens to the communication and performs decoding of captured frames, and determines the WiFi network node which was...
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