This article Sweden Blacking Technical College: PhD thesis (author Svante Björklund), a total of 190.
Radar (Radio Detection And Ranging) uses radio waves to detect the presence of target, and to measure their positions and other characteristics. The radar sensor with large monitoring range, all-weather day and night work and other advantages, has been widely used in civilian and military. This thesis work focused on two independent research areas: 1) an array antenna and radar 2) micro-Doppler radar. Radar array antenna having an array antenna means in the same space that the several small antenna. Compared with the traditional single antenna radar, the radar array antenna having a higher flexibility, higher capacity, various radar functions, while improving reliability, so that the new signal processing becomes possible, and provides new features and higher performance.
This article contribution to the array antenna radar is mainly reflected in three aspects. The first is used in radar and high-resolution data from actual measurement DOA (direction of arrival) estimation (HRDE). HRDE has important applications in radar and other areas to provide new features and improves performance. The second aspect is the suppression of interference (noise, interference, and scattering of the direct path interference), which is usually detected and the necessary targets. Based on the characteristics of the interference signal, an antenna sub-array geometry and design, and in terms of interference suppression method gives various corresponding results. The third aspect is the measurement technique, two proposed survey design, one is based radar measurements, one is measuring the scattered signal.
Doppler radar with micro-measurement function: There is a growing concern and the need for safety, security and military surveillance within a short distance. The main tasks include the detection of targets, such as people, animals, cars, boats, small aircraft and unmanned aerial vehicles; target type and target activities are classified; distinguish between individual goals and objectives to predict intentions. One method is to use micro-Doppler radar to accomplish these tasks. Micro-Doppler is generated by internal movement of the target, such as human and animal arms, legs, car wheels and rotary-wing UAVs. In this paper, micro-Doppler technique for classification given feature extraction, classification target type (human, animals and man-made objects) and human gait and for micro-Doppler feature information of the same human subject identification again. It also demonstrated the ability to use different types of micro-Doppler radar measurements. The main conclusion is that the micro-Doppler radar, it should be used for safety, security and military surveillance applications.
Radar (RAdio Detection And Ranging) uses radio waves to detect thepresence of a target and measure its position and other properties. This sensorhas found many civilian and military applications due to advantages such aspossible large surveillance areas and operation day and night and in allweather. The contributions of this thesis are within applied signal processingfor radar in two somewhat separate research areas: 1) radar with array antennasand 2) radar with micro-Doppler measurements. Radar witharray antennas: An array antenna consists of several smallantennas in the same space as a single large antenna. Compared to a traditionalsingle-antenna radar, an array antenna radar gives higher flexibility, higher capacity,several radar functions simultaneously and increased reliability, and makes newtypes of signal processing possible which give new functions and higher performance.The contributions on array antenna radar in this thesis are in three different problemareas. The first is High Resolution DOA (Direction Of Arrival) Estimation(HRDE) as applied to radar and using real measurement data. HRDE is useful inseveral applications, including radar applications, to give new functions andimprove the performance. The second problem area is suppression of interference(clutter, direct path jamming and scattered jamming) which often is necessaryin order to detect and localize the target. The thesis presents various resultson interference signal properties, antenna geometry and subarray design, and oninterference suppression methods. The third problem area is measurementtechniques for which the thesis suggests two measurement designs, one forradar-like measurements and one for scattered signal measurements. Radarwith micro-Doppler measurements: There is an increasinginterest and need for safety, security and military surveillance at shortdistances. Tasks include detecting targets, such as humans, animals, cars,boats, small aircraft and consumer drones; classifying the target type andtarget activity; distinguishing between target individuals; and also predictingtarget intention. An approach is to employ micro-Doppler radar to perform thesetasks. Micro-Doppler is created by the movement of internal parts of thetarget, like arms and legs of humans and animals, wheels of cars and rotors ofdrones. Using micro-Doppler, this thesis presents results on feature extractionfor classification; on classification of targets types (humans, animals andman-made objects) and human gaits; and on information in micro-Dopplersignatures for re-identification of the same human individual. It alsodemonstrates the ability to use different kinds of radars for micro-Dopplermeasurements. The main conclusion about micro-Doppler radar is that it shouldbe possible to use for safety, security and military surveillance applications.
- Motivation and Research Review
- Radar base
2.1 radar principle
2.2 radar applications,
advantages and disadvantages of radar 2.3
2.4 radar signal processing - Array antenna radar
3.1 a number of related applications
3.2 radar signal model
moving object detecting interference 3.3
3.4 arrival angle estimation precision - Doppler radar has micro measuring function
4.1 Introduction
4.2 micro-Doppler radar research
signal processing micro-Doppler Radar 4.3 - Published papers
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