Concept

Doppler radar

Related publications (16)

A Data-Driven Ecosystem for Rainfall Science: Integrating Disdrometers, Ground-Based Radars, and Multi-Sensor Spaceborne Observations

Precipitation is a key component of the water cycle, but its strong spatial and temporal variability makes it difficult to quantify accurately. Ground-based point observations provide direct measurements but have limited spatial representativeness, while weather radar and satellite remote-sensing retrievals extend precipitation estimates over larger areas but remain indirect and sensitive to assumptions about hydrometeor microphysics. For rainfall, a major source of uncertainty is the variability of the dro

EPFL2026

Precipitation processes in an Antarctic moist air intrusion: insights from multi-frequency radar observations over a 1100-km transect

In Antarctica, intrusions of coastal moist and warm air onto the high plateau play an important role in the mass balance of the ice sheet, due to their significant contribution to annual snowfall accumulation. The synoptic drivers of warm intrusions are well-established, in particular for extreme cases linked to atmospheric rivers. However, a lack of suitable observations means the micro-physical cloud and precipitation processes within intrusions remain uncertain. In the context of the Atmospheric WAter Cy

Copernicus GmbH2026

CleanCloud CHOPIN - radar data & code

This repository contains the code & data referenced in the ESSD manuscript "Multi-frequency radar measurements of clouds and precipitation collected during the 2024-2025 CHOPIN campaign at Mt. Helmos". Manuscript abstract: This article describes the dataset of cloud and precipitation measurements collected during the CleanCloud Helmos OrograPhic sIte experimeNt (CHOPIN) campaign, conducted from October 2024 to January 2025 on Mt. Helmos, Peloponnese, Greece. The data were collected by the Environment

Zenodo2026

Precipitation processes in an Antarctic moist air intrusion: insights from multi-frequency radar observations over a 1100-km transect

The ERC Synergy funded project AWACA aims to understand the atmospheric branch of the water cycle over Antarctica. It relies on innovative observations of the tropospheric meteorological conditions and the isotopic composition of water vapor and hydrometeors along a 1100-km transect between Dumont d’Urville station at the coast and Concordia station on the high inner Antarctic plateau. The deployment of instruments was completed in the austral summer season from November 2024 to February 2025. The instrumen

2026

Enhanced GPR Imaging Using High-Resolution TR-MUSIC for Underground Object Localization

Farhad Rachidi-Haeri, Marcos Rubinstein

In this paper, we present a novel, high-resolution method, referred to as HRTR, for localizing underground objects. HRTR is based on a combination of the Time Reversal (TR) and Multiple Signal Classification (MUSIC) algorithms, and can be readily integrated with conventional ground-penetrating radar (GPR) systems without requiring any additional hardware. The proposed method offers significant advantages, particularly in achieving higher resolution, which enhances the ability to distinguish ground surface r

Nature Research2026

Short mode-locked pulses from planarized Y-coupled THz lasers

Short THz pulses are highly attractive both for fundamental research and practical applications in this underdeveloped region of the electromagnetic spectrum. Typically, THz pulses are generated using nonlinear optical methods, starting from a high-power visible or near-IR mode-locked source, but usually suffer from low conversion efficiencies. Here, we present a direct on-chip THz source of coherent short pulse trains based on active mode-locking of an inverse-designed planarized Y-coupled THz quantum casc

AIP Publishing2026

Teaching about the relativistic background of synchrotron radiation: some intriguing aspects with strong didactic implications

Giorgio Margaritondo

Not fully grasping the concepts of relativity can lead to misunderstandings about the fundamental background of synchrotron emission. Here we deal with some intriguing cases, in which the relevant

speed of light' is not the invariant c but the speed with respect to a moving object. This specifically affects two pillars of synchrotron radiation: the Lorentz length contraction and the Doppler shift. We propose a teaching strategy relying on new versions of simple

thought' experiments. Besides putting synchr

International Union of Crystallography2026

Modulating reflexes enables speed control in simulated human walking and running

Auke Ijspeert

Human locomotion is characterized by remarkable versatility, enabling smooth speed modulation, acceleration, deceleration, and transitions between gaits. This versatility is thought to emerge from interactions between the musculoskeletal system, spinal circuits—including reflexes and central pattern generators—and supraspinal control. The relative contributions of these components remain a subject of ongoing debate. In this study, we explore the potential role of reflex modulation in achieving the observed

Springer Science and Business Media LLC2026

Calibration of weather radars with a target simulator

We present findings from radar calibration experiments involving three radars operated by the Colorado State University (CSU) in the US and by the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland. The experiments were based on the comparison between measured radar variables and the known properties of artificial point targets electronically generated with a polarimetric radar target simulator (RTS) from Palindrome Remote Sensing. Radars under test included the two magnetron-based radars CHILL

2025

Small-scale spatial rainfall variability during the extreme convective rain event of June 11th, 2018, over the city of Lausanne

Localized and Intense Rainfall Events (LIREs) can cause significant societal and economic damages. Typically developing over very small spatial and temporal scales, the accurate characterization and forecasting of such events remains, however, particularly challenging. By collecting distributed space-time observations, weather radars can provide useful information for the analysis of such events. In this study we take advantage of the experimental high-resolution radar data from the MeteoSwiss operational r

2025

3D Shape Reconstruction from Autonomous Driving Radars

This paper presents RFconstruct, a framework that enables 3D shape reconstruction using commercial off-the-shelf (COTS) mmWave radars for self-driving scenarios. RFconstruct overcomes radar limitations of low angular resolution, specularity, and sparsity in radar point clouds through a holistic system design that addresses hardware, data processing, and machine learning challenges. The first step is fusing data captured by two radar devices that image orthogonal planes, then performing odometry-aware tempor

2025

A System Engineering Approach to Antenna Design in Secure and Sensing Systems

In increasingly compact and complex platforms such as satellites, autonomous vehicles, and connected sensors, antennas are no longer isolated components. They are deeply embedded within the system architecture and have a direct impact on overall performance, integration complexity, and physical constraints. This thesis investigates the role of antennas from a system engineering perspective, demonstrating how the early and accurate derivation of system requirements can enable better-informed antenna design

EPFL2025

Investigating Secondary Ice Production effects on wintertime orographic clouds using the Regional Atmospheric Modelling System (RAMS)

In recent years, there has been a breakthrough in the identification and description of various secondary ice production (SIP) mechanisms that affect mixed-phase clouds. However, SIP is in general not described well in climate and mesoscale models, which leads to notable biases in the representation of warm mixed-phase clouds in terms of ice content, ice number concentration and cloud structure. In this study, the Integrated Community Limited Area Modelling System (ICLAMS) has been utilized to examine the f

2025

Kriging-variance based multi-member ensembles of radar-raingauge precipitation estimates: application in Switzerland

CombiPrecip is an operational algorithm of MeteoSwiss that combines in real-time raingauge measurements with radar precipitation estimates across a domain of 710x640km2, covering Switzerland and extending beyond the Swiss borders. The system utilizes a geostatistical approach known as kriging with external drift as an interpolation technique, offering probabilistic outcomes that provide both a mean value and a variance at each interpolated point. The purpose of our study is two-fold: (i) We investigate to w

2025

High-resolution visible spectroscopy for ion temperature and flow velocity measurements of the TCV divertor plasma

Basil Duval, Holger Reimerdes

A high-resolution spectroscopic system was installed on the Tokamak à Configuration Variable (TCV), whose toroidal lines-of-sight (LOS) cross the divertor region. This system simultaneously measures the Doppler broadening and Doppler shift of several spectral transitions to infer their associated ion temperatures (Ti) and the toroidal component of their flow velocities (Vi). Herein, TCV’s Tangential Divertor Spectroscopy System (TDSS) is described, along with its data analysis procedure and the first simult

AIP Publishing2025

An Evaluation of SIP parametrizations in WRF in an Orographic Environment with Preliminary Data From CHOPIN

Mixed-phase clouds play a key role in weather and climate and are a major challenge to model accurately in models. The realistic representation of Mixed-phase clouds has been shown to be a large contributing factor to the uncertainty in the Coupled Model Intercomparison Project Phase 6 (CMIP6) model predictions of climate sensitivity and therefore understanding the capabilities and limitations of modelling mixed-phase cloud is of importance. Nevertheless, considerable progress on modeling microphysical proc

École Polytechnique Fédérale de Lausanne2025

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Related publications (16)

A Data-Driven Ecosystem for Rainfall Science: Integrating Disdrometers, Ground-Based Radars, and Multi-Sensor Spaceborne Observations

EPFL2026

Precipitation processes in an Antarctic moist air intrusion: insights from multi-frequency radar observations over a 1100-km transect

Copernicus GmbH2026

CleanCloud CHOPIN - radar data & code

Zenodo2026

Precipitation processes in an Antarctic moist air intrusion: insights from multi-frequency radar observations over a 1100-km transect

2026

Enhanced GPR Imaging Using High-Resolution TR-MUSIC for Underground Object Localization

Farhad Rachidi-Haeri, Marcos Rubinstein

Nature Research2026

Short mode-locked pulses from planarized Y-coupled THz lasers

AIP Publishing2026

Teaching about the relativistic background of synchrotron radiation: some intriguing aspects with strong didactic implications

Giorgio Margaritondo

Not fully grasping the concepts of relativity can lead to misunderstandings about the fundamental background of synchrotron emission. Here we deal with some intriguing cases, in which the relevant

speed of light' is not the invariant c but the speed with respect to a moving object. This specifically affects two pillars of synchrotron radiation: the Lorentz length contraction and the Doppler shift. We propose a teaching strategy relying on new versions of simple

thought' experiments. Besides putting synchr

International Union of Crystallography2026

Modulating reflexes enables speed control in simulated human walking and running

Auke Ijspeert

Springer Science and Business Media LLC2026

Calibration of weather radars with a target simulator

2025

Small-scale spatial rainfall variability during the extreme convective rain event of June 11th, 2018, over the city of Lausanne

2025

3D Shape Reconstruction from Autonomous Driving Radars

2025

A System Engineering Approach to Antenna Design in Secure and Sensing Systems

EPFL2025

Investigating Secondary Ice Production effects on wintertime orographic clouds using the Regional Atmospheric Modelling System (RAMS)

2025