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This paper focuses on a classification of ISAR low resolution imaging of sea targets (cargo vessels) using the most popular classifiers. First, a method of the raw, passive data collection is described. Second, two feature vectors related to a size of the object (its width and length) are extracted, which then are applied for separating the objects into classes. Finally, the accuracy analysis of different...
Noise radars offers several advantages over classical ones, but they have to deal with the masking problem. The masking problem occurs when strong echoes mask weaker echoes in their correlation sidelobes. Moreover due to the increasing number of telecommunication and radar systems, the frequency band allocation becomes an issue and many systems may be forced to coexist in given frequency band. In...
Noise radars — radars that use random waveforms as sounding waveforms — are prone to what is known as a masking effect. This occurs when the correlation sidelobes of a strong target echo masks weaker echoes. In order to overcome this limitation, the sounding signals which have correlation functions with suppressed sidelobes may be used. When designing such signals, the power efficiency should be considered,...
This paper provides a preliminary survey of the algoritms used in ISAR imaging for the ship recognition. It provides an overview of existing literature and summarises the current state on a topic. The author of the paper focuses on the algorithms for a single target.
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...
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...
The paper presents an experiment with bistatic passive SAR imaging in a scenario involving the TerraSAR-X satellite as an illuminator of opportunity and a static, ground-based receiver. The experiment was performed during a measurement campaign carried out by the Warsaw University of Technology in July 2012. In the paper the design of an X-Band receiver system and the bistatic SAR processing used...
Rapid growth in the number of wind farms may influence the performance of many radar systems. The radar echoes originating from wind turbine's blades and tower may mask existing objects or generate false plots. In the presented paper the authors analyze the influence of a wind turbine on Passive Coherent Location radars and discuss the effectiveness of simple methods used to overcome problems associated...
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