Doppler frequency
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Radar‐based fall detection based on Doppler time–frequency signatures for assisted living Open
Falls are a major public health concern and main causes of accidental death in the senior U.S. population. Timely and accurate detection permit immediate assistance after a fall and, thereby, reduces complications of fall risk. Radar techn…
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Compact CRB for delay, Doppler, and phase estimation – application to GNSS SPP and RTK performance characterisation Open
The derivation of tight estimation lower bounds is a key tool to design and assess the performance of new estimators. In this contribution, first, the authors derive a new compact Cramér–Rao bound (CRB) for the conditional signal model, wh…
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Compressed Channel Estimation with Position-Based ICI Elimination for High-Mobility SIMO-OFDM Systems Open
Orthogonal frequency-division multiplexing (OFDM) is widely adopted for providing reliable and high data rate communication in high-speed train systems. However, with the increasing train mobility, the resulting large Doppler shift introdu…
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Signal Processing for a Multiple-Input, Multiple-Output (MIMO) Video Synthetic Aperture Radar (SAR) with Beat Frequency Division Frequency-Modulated Continuous Wave (FMCW) Open
In this paper, we present a novel signal processing method for video synthetic aperture radar (ViSAR) systems, which are suitable for operation in unmanned aerial vehicle (UAV) environments. The technique improves aspects of the system’s p…
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Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger Open
Bats of the Rhinolophidae and Hipposideridae families, and Pteronotus parnellii , compensate for Doppler shifts generated by their own flight movement. They adjust their call frequency such that the frequency of echoes coming from ahead fa…
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Probability of detection for GNSS signals with sign transitions Open
In global navigation satellite system (GNSS) receivers, the acquisition process is the first stage of the signal processing module. It consists of assessing the presence of GNSS signals and providing a rough estimation of the incoming sign…
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Vehicle Localization Using Doppler Shift and Time of Arrival Measurements in a Tunnel Environment Open
Most applications and services of Cooperative Intelligent Transport Systems (C-ITS) rely on accurate and continuous vehicle location information. The traditional localization method based on the Global Navigation Satellite System (GNSS) is…
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Improved Sensitivity RF Photonics Doppler Frequency Measurement System Open
An improved sensitivity Doppler frequency measurement system based on microwave photonics technology was demonstrated practically. The system employs a four-wave mixing effect to achieve broad radio-frequency (RF) frequency measurement. In…
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Low-Complexity Iterative Detection for Orthogonal Time Frequency Space Modulation Open
We elaborate on the recently proposed orthogonal time frequency space (OTFS) modulation technique, which provides significant advantages over orthogonal frequency division multiplexing (OFDM) in Doppler channels. We first derive the input-…
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Human Micro-Doppler Frequency Estimation Approach for Doppler Radar Open
Micro-Doppler frequency estimation is an important issue for radar target recognition. In this paper, a novel approach is proposed to accurately estimate the micro-Doppler frequencies of specific target scattering parts, which can be very …
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Experimental Study of Silent Sonar Open
Stealth is a frequent requirement in military applications and involves the use of devices whose signals are difficult to intercept or identify by the enemy. The silent sonar concept was studied and developed at the Department of Marine El…
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Monitoring Lakes Surface Water Velocity with SAR: A Feasibility Study on Lake Garda, Italy Open
The SAR Doppler frequencies are directly related to the motion of the scatterers in the illuminated area and have already been used in marine applications to monitor moving water surfaces. Here we investigate the possibility of retrieving …
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A Doppler Range Compensation for Step-Frequency Continuous-Wave Radar for Detecting Small UAV Open
Step-frequency continuous-wave (SFCW) modulation can have a role in the detection of small unmanned aerial vehicles (UAV) at short range (less than 1–2 km). In this paper, the theory of SFCW range detection is reviewed, and a specific meth…
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Coherent Integration Method of High-Speed Target for Frequency Agile Radar Open
In order to detect the high-speed target for frequency agile (FA) radar, a coherent integration method is proposed in this paper. Making full use of the characteristics of the FA radar, the echoes are classified after pulse compression acc…
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Analysis of Human Kinetics Using Millimeter-Wave Micro-Doppler Radar Open
In this paper, we presented a millimeter wave micro-Doppler radar for human motion detection. The concept of micro-Doppler is used to identify the motion of different body parts. Recently, the human detection using radar has number of appl…
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Modelling, Analysis, and Simulation of the Micro-Doppler Effect in Wideband Indoor Channels with Confirmation Through Pendulum Experiments Open
This paper is about designing a 3D no n-stationary wideband indoor channel model for radio-frequency sensing. The proposed channel model allows for simulating the time-variant (TV) characteristics of the received signal of indoor channel i…
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Joint 2D DOA and Doppler frequency estimation for L-shaped array using compressive sensing Open
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Importance of Background Vorticity Effect and Doppler Shift in Defining Near‐Inertial Internal Waves Open
Near‐inertial waves contain a significant fraction of the ocean's internal wave energy and can propagate long distances from their source before dissipating. However, a varying background flow velocity can alter the wave propagation in two…
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Direct Position Determination of Coherent Pulse Trains Based on Doppler and Doppler Rate Open
Direct Position Determination (DPD) of coherent pulse trains using a single moving sensor is considered in this paper. Note that when a large observation window and relative maneuvering course between emitter and receiver both exist, the l…
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On the Optimal Design of Doppler Scatterometers Open
Pencil-beam Doppler scatterometers are a promising remote sensing tool for measuring ocean vector winds and currents from space. While several point designs exist in the literature, these designs have been constrained by the hardware they …
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Determination technique of quasireference value of a carrier radio signal frequency of uncooperated onboard lighting source during radio monitoring Open
The article discloses the technique defining quasireference value of a carrier radio signal frequency of uncooperated onboard lighting source by calculation and compensation of the Doppler shift at radio monitoring. Provided simulation res…
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The Radio Direction Finding with Advantage of the Software Defined Radio Open
The radio-frequency engineering recently has gone through extensive development. Software-Defined Radio (SDR) plays an important role in this development, bringing new possibilities to radio-frequency engineering and enables us to look at …
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Emitter Location Using Frequency Difference of Arrival Measurements Only Open
It is desirable to enable emitter location using frequency difference of arrival (FDoA) measurements only, since many signals are characterized by coarse range resolution and fine Doppler resolution. For instance, while using the cross-amb…
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Features Extraction of the Doppler Frequency Signature of a Human Walking at 1 GHz Open
A preliminary Doppler analysis on a man walking in free space at 1 GHz is presented in this paper. Firstly, the back-scattered response of the moving target has been provided by a simulation tool based on physical optics (PO) theory. Then,…
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Frequency Instability Impact of Low-Cost SDRs on Doppler-Based Localization Accuracy Open
In this paper, we explore several widely available software-defined radio (SDR) platforms that could be used for locating with the signal Doppler frequency (SDF) method. In the SDF, location error is closely related to the accuracy of dete…
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An Instantaneous 3D Ego-velocity Measurement Algorithm for Frequency Modulated Continuous Wave (FMCW) Doppler Radar Data Open
This thesis describes an instantaneous 3D body-frame linear velocity measurement algorithm that operates solely on Doppler radar target data. A robust, model-free estimate of the ego-velocity vector of the sensor platform can be determined…
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Azimuth ambiguity suppression in SAR images using Doppler-sensitive signals Open
In the article the problem of the azimuth ambiguity in synthetic aperture radar (SAR) images and its genesis are presented. A method of suppressing the ambiguities by utilization of Doppler-sensitive signals is proposed, and the necessary …
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An enhanced LMMSE channel estimation under high speed railway scenarios Open
With the rapid deployment of the high speed railway (HSR), the wireless\ncommunication in HSR has been one of the indispensable scenarios in the fifth\ngeneration (5G) communications. In order to improve the performance of the\northogonal …
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Novel BAT Algorithm for Position Estimation of A GPS Receiver Located in Coastal Region of Southern India Open
Based on the echo location principle used by bats, the Bat Algorithm (BA) has been developed. By introducing foraging of bats and doppler effect in the Bat Algorithm leads to generate Novel Bat Algorithm (NBA). In this paper, the NBA is im…
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SNR Improvement for Maneuvering Ship Using Weak Echo Under the Condition of Beidou GEO Satellites Open
Using global navigation satellite systems as transmitters of opportunity for target detection is a hot issue. The problems of this technology are the restricted power budget provided by navigation satellites and the defocusing caused by th…