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The distinguishing feature of frequency diverse array (FDA) systems as compared to conventional phased-array and multiple-input multiple-output (MIMO) radar systems is the use of a small frequency offset (FO) across the array elements. Much of the development to date has focused on the FDA-MIMO structure, using an FO that is larger than the bandwidth of the baseband signal, thereby reducing the re

This paper examines the short-range propagation characteristics of sound wave propagation in an ice covered lake experiment. The studied measurements were made in February 2024 in the shallow Song-Hua lake in northern China. The experiment illustrates how the wave propagation notably varies as a function of depth and due to changes in the water temperature, but also how the ice cover influences th

When processing radar signals, the target steering vector is generally only partially known, being subject to various forms of errors and mismatches. In this article, we investigate the design of an unimodular transmit sequence that is robust against steering vector mismatches, with the aim of enhancing the performance of a frequency diverse array multiple-input-multiple-output (FDA-MIMO) radar sy

This paper introduces a novel method for solving the single-source localization problem, specifically addressing the case of trilateration. We formulate the problem as a weighted least-squares problem in the squared distances and demonstrate how suitable weights are chosen to accommodate different noise distributions. By transforming this formulation into an eigenvalue problem, we leverage existin

Time delay estimation or Time-Difference-Of-Arrival estimates is a critical component for multiple localization applications such as multilateration, direction of arrival, and self-calibration. The task is to estimate the time difference between a signal arriving at two different sensors. For the audio sensor modality, most current systems are based on classical methods such as the Generalized Cro

This work investigates the design of beampatterns for frequency diverse arrays-multiple-input multiple-output (FDA-MIMO) in the range-angle plane, in order to improve the approximation of a desired beampattern. Recognizing that the energy radiated by the array cannot be locked at a fixed range and angle, the beampattern is designed for the equivalent beampattern at the receiving end, differing fro

The separation of multiple transmit waveforms with time and frequency synchronization constitutes a considerable challenge for multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) systems. It is well-known that aliased signal returns may be separable by digital beamforming (DBF) on receive in elevation. However, the current orthogonal-waveform beamforming schemes significantly incr

This article addresses the problem of multi-target localization from acoustic time delay measurements in a 3-D underwater environment, taking into account the depth-dependent sound speed of the underwater wave propagation. Specifically, we formulate the problem as an optimal mass transport (OMT) optimization over a grid of potential candidate positions. By exploiting an iterative refinement approa

This project evaluates the impact of interior insulation on external walls in three Swedish heritage buildings. Field measurements and hygrothermal simulations were conducted to assess available solutions. Measurements of temperature and relative humidity were taken both indoors and outdoors, as well as on the exterior and interior surfaces of the walls. The accuracy of simulation standards for in

This article addresses the detection and estimation problems of a distributed multiple-input and multiple-output (MIMO) radar system with synchronization errors. In such cases, the outputs of all waveform-specific matched filters contain errors in the resulting time delay estimates, which will cause biases in the corresponding estimation of the active range cells. To overcome the impact resulting

Frequency diverse array (FDA) radars provide a potential solution to target localisation along the slant range and azimuth angle due to the range-angle-dependent transmit beampattern caused by the used frequency increments. However, the S -shaped beampattern resulting from the standard FDA leads to multiple candidate location estimates, introducing ambiguity in the target localization. To make ful

In this work, we consider the problem of estimating the directions of arrival of far-field sources impinging on a sensor array using a computationally efficient approach. A novel adaptive grid selection technique is employed to reduce the dimensionality of the used dictionary matrix. The method further makes use of a SPICE-inspired dictionary to adaptively select an appropriate regularization para

Direct ground cooling systems (DGCS) can provide comfort cooling to buildings without the use of any refrigeration-based cooling methods. DGCS is an emerging technology, commonly used for new office buildings in cold climates. This study aims to evaluate the energy-saving possibilities of a DGCS compared to a conventional chiller system for an existing office building. A typical Swedish office bui

In the hushed morning after San Cristobal's New Year's celebration in 1994, hundreds of masked rebels moved through the empty The Role of Environmental Scarcity in Nepal’s Maoist Insurgency Master’s Thesis by: Micah Sherman Submitted on February 24th, 2003 Supervisor: Thomas Malm Lund University International Master’s Programme in Environmental Science, LUMES Micah Sherman c/o LUMES Box 170 221 00

https://www.lumes.lu.se/sites/lumes.lu.se/files/sherman_micah.pdf - 2026-05-05

Test "Title" ORNIS SCANDINAVICA 14: 48-50. Copenhagen 1983 Laying of replacement clutches in the Willow Warbler Phylloscopus trochilus in Lapland, Sweden Lars Nilsson Nilsson, L. 1983. Laying of replacement clutches in the Willow Warbler Phylloscopus trochilus in Lapland, Sweden. - Ornis Scand. 14: 48-50. Clutch size and the number of young, 8 d old, were determined for 23 individually ringed fema

https://www.luvre.lu.se/sites/luvre.lu.se/files/luvre-053nilssonomlaggninglosan.pdf - 2026-05-05

Painful Pasts and U seful M em ories R em em bering and Forgetting in Europe Lund 2012 Edited by: Barbara Törnquist-Plewa & Niklas Bernsand CENTRE FOR EUROPEAN STUDIES AT LUND UNIVERSITY Painful Pasts and useful MeMories reMeMbering and forgetting in euroPe CFE Conference Papers Series No. 5 | Lund 2012 In order to bring research in Memory Studies conducted in the Nordic countries together, to con

https://www.cfe.lu.se/en/sites/cfe.lu.se.en/files/2020-12/cfecp5.pdf - 2026-05-05

GHANA: AFRINT 3: Ghana Micro Report GHANA: Household–Level Farm–Nonfarm Linkages and Household Welfare Implications Fred M. Dzanku Institute of Statistical Social & Economic Research University of Ghana fdzanku@gmail.com & Daniel B. Sarpong Department of agricultural economics & Agribusiness University of Ghana akwei7@yahoo.com August 2014 AFRINT 3: Ghana Micro Report 1 Executive Summary This repo

https://www.keg.lu.se/en/sites/keg.lu.se.en/files/ghana_afrint_iii_report.pdf - 2026-05-05

dmrr2427 557..567 Methods, quality control and specimen management in an international multicentre investigation of type 1 diabetes: TEDDY Kendra Vehik1* Steven W. Fiske1 Chad A. Logan1 Daniel Agardh2 Corrado M. Cilio2 William Hagopian3 Olli Simell4 Merja Roivainen5 Jin-Xiong She6 Thomas Briese7 Sami Oikarinen8 Heikki Hyoty8,9 Anette-G. Ziegler10 Marian Rewers11 Ake Lernmark2 Beena Akolkar12 Jeffr

https://www.teddy.lu.se/sites/teddy.lu.se/files/2021-11/27%2006032016_679_27_Vehik_DMRR_2013.pdf - 2026-05-05

Development plan for the Bachelor’s programme in Development Studies (BIDS) Page 1 of 10 FacultyBoard DEVELOPMENT PLAN Registration number STYR 2020/1760 3 February 2022 Development plan for the Bachelor’s programme in Development Studies (BIDS) Background The Bachelor’s programme in Development Studies at the Faculty of Social Sciences was evaluated in 2021 by an external expert group. The group

https://www.sam.lu.se/en/internal/sites/sam.lu.se.en.internal/files/2022-05/Development-plan-BIDS.pdf - 2026-05-05

Våra forskare Mer information om våra forskare och deras forskning hittar du i Lunds universitets forskningsportal. Fysik- och astronomibiblioteket Mer information om öppettider, adress och kontaktuppgifter, hittar du på bibliotekets webbplats. Institutionskansliet Kontaktuppgifter och information till administrativ och teknisk personal vid Fysiska institutionen. Administrativ ledningAdresserAvdel

https://www.fysik.lu.se/kontakt - 2026-05-03