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High Resolution Direction of Arrival Estimation Methods Applied to Measurements from a Digital Array Antenna
Swedish Defence Research Agency (FOI ), SWE.ORCID iD: 0000-0003-0701-706X
Swedish Defence Research Agency (FOI ), SWE.
2000 (English)In: First IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM 2000), IEEE Signal Processing Society, 2000, 464-468 p.Conference paper (Refereed)
Abstract [en]

At the Defence Research Establishment of Sweden (FOA) an experimental S-band receiving digital array antenna for radar applications has been designed and built. It consists of a horizontal uniform linear array (ULA) of 12 antenna elements, whose digitized signals are processed in non-real time in a computer. Accurate calibration is utilized.

We have compared several spectral and parametric direc- tion-of-arrival (DOA) estimation methods for varying DOA separations, number of samples and signal-to-noise ratios (SNR) on measured data from an anechoic cham- ber.

At ideal conditions the resolution can be improved con- siderably with model based DOA methods compared to conventional beamforming. We achieved a resolution 1below /10 of the resolution of conventional beamforming.

Place, publisher, year, edition, pages
IEEE Signal Processing Society, 2000. 464-468 p.
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:bth-13537DOI: 10.1109/SAM.2000.878052OAI: oai:DiVA.org:bth-13537DiVA: diva2:1057505
Conference
First IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM), Cambridge, Massachusetts
Available from: 2016-12-18 Created: 2016-12-05 Last updated: 2017-01-16Bibliographically approved
In thesis
1. Signal Processing for Radar with Array Antennas and for Radar with Micro-Doppler Measurements
Open this publication in new window or tab >>Signal Processing for Radar with Array Antennas and for Radar with Micro-Doppler Measurements
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Radar (RAdio Detection And Ranging) uses radio waves to detect the presence of a target and measure its position and other properties. This sensor has found many civilian and military applications due to advantages such as possible large surveillance areas and operation day and night and in all weather. The contributions of this thesis are within applied signal processing for radar in two somewhat separate research areas: 1) radar with array antennas and 2) radar with micro-Doppler measurements.

Radar with array antennas: An array antenna consists of several small antennas in the same space as a single large antenna. Compared to a traditional single-antenna radar, an array antenna radar gives higher flexibility, higher capacity, several radar functions simultaneously and increased reliability, and makes new types of signal processing possible which give new functions and higher performance.

The contributions on array antenna radar in this thesis are in three different problem areas. The first is High Resolution DOA (Direction Of Arrival) Estimation (HRDE) as applied to radar and using real measurement data. HRDE is useful in several applications, including radar applications, to give new functions and improve the performance. The second problem area is suppression of interference (clutter, direct path jamming and scattered jamming) which often is necessary in order to detect and localize the target. The thesis presents various results on interference signal properties, antenna geometry and subarray design, and on interference suppression methods. The third problem area is measurement techniques for which the thesis suggests two measurement designs, one for radar-like measurements and one for scattered signal measurements.

Radar with micro-Doppler measurements: There is an increasing interest and need for safety, security and military surveillance at short distances. Tasks include detecting targets, such as humans, animals, cars, boats, small aircraft and consumer drones; classifying the target type and target activity; distinguishing between target individuals; and also predicting target intention. An approach is to employ micro-Doppler radar to perform these tasks. Micro-Doppler is created by the movement of internal parts of the target, like arms and legs of humans and animals, wheels of cars and rotors of drones.

Using micro-Doppler, this thesis presents results on feature extraction for classification; on classification of targets types (humans, animals and man-made objects) and human gaits; and on information in micro-Doppler signatures for re-identification of the same human individual. It also demonstrates the ability to use different kinds of radars for micro-Doppler measurements. The main conclusion about micro-Doppler radar is that it should be possible to use for safety, security and military surveillance applications.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Tekniska Högskola, 2017. 180 p.
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 2
Keyword
radar, signal processing, array antenna, subarray, clutter, jamming, interference, direction of arrival estimation, security, micro-Doppler, feature extraction, classification
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-13639 (URN)978-91-7295-335-2 (ISBN)
Public defence
2017-03-31, Karlskrona, 00:00 (English)
Opponent
Supervisors
Available from: 2017-01-16 Created: 2016-12-18 Last updated: 2017-03-08Bibliographically approved

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