# av A Voutilainen · 2001 · Citerat av 11 — Functional Dependency Grammar FDG (Tapanainen and Järvinen 1997). to introduce light syntactic ambiguity, so before any disambiguation is done, an.

iv ABSTRACT USE OF THE AMBIGUITY FUNCTION TECHNIQUE FOR TARGET DETECTION IN PHASE CODED CONTINUOUS WAVE RADARS ÇANKAYA, Erkan M.Sc., Department of Electrical and Electronics Engineering

It will be used extensively in the following chapters, where different signals will be described. The chapter presents four important properties of the ambiguity function and proves them. 2013-06-29 · The use of the term “ambiguity” to describe a particular type of uncertainty is due to Daniel Ellsberg in his classic 1961 article and 1962 PhD thesis, 1 who informally described it as: “the nature of one’s information concerning the relative likelihood of events… a quality The ambiguity function Θ(τH, ϱH) is maximized when τH = τA and ϱH = ϱA. Here, we assume that the narrowband condition is satisfied, i.e., the time-bandwidth product of the transmitted signal is much smaller than the signal propagation speed divided by the time derivative of the total bistatic range to the target. Transform (FFT). This will allow generation of ambiguity functions of advanced waveforms and signal processors.

ambiguity of deontic linguistic forms (modal verbs and verbal moods). 1.1. Pragmatic ambiguity of deontic sentences The pragmatic ambiguity of deontic sentences is a very well known phenomenon in speech acts theory.1 This phenomenon has been isolated by the German logician Christoph Sigwart [1830-1904]. ambiguity function, a data-adaptive noise suppression technique has been developed and demonstrated. A simple modification of the WD, with smoothing and logarithmic transformation, mitigated strong, time-varying noise that interfered with CAF detection. 2021-03-29 Narrowband and wideband ambiguity functions are fundamental in the study of parameter estimation by active radar and sonar systems. Interest in ambiguity function theory has been renewed due to the current intense research activity in affine wavelet transforms and other group theoretic transforms.

## av A Sønderholm · 2020 — function while placed into the frames of 'public diplomacy'. The institution The Ambiguity of Return Migration and Claims to Modernity. Asian Studies Review

no ambiguity that a higher/. The properties of radar signals, which characterize the measurement of a target's range and range rate, are described by the Woodward ambiguity function.

### hur både tids- och frekvensskillnader skattas ur en. CAF för att sedan användas för lägesbestämning. 3 Time Difference Of Arrival. 4 Cross Ambiguity Function.

4.1 AMBIGUITY FUNCTION DEVELOPMENT Since the ambiguity function can be thought of as the response of a signal processor to a received radar waveform, this is the approach we take in deriving the ambiguity function. ambiguity function [14]. There are also unfortunate erroneous statements in the literature, including that the ambiguity func-tion is not invertable (it is), the magnitude of the ambiguity function (rather than its real part) determines Doppler and range, and that the ambiguity function of the baseband signal PDF | Like the Wigner function, the Ambiguity function provides an elegant way to describe the propagation of a partially coherent beam in free space or | Find, read and cite all the research The Role of the Ambiguity Function in Waveform Design and Phase coded Waveforms I. INTRODUCTION The design of radar waveforms has received considerable attention since the 1950s. In 1953, P.M. Wood-ward [Woo53b], [Woo53a] deﬁned the narrow band radar ambiguity function or, simply, ambiguity function.

A general result is established for annihilating sets : strongly/weakly annihilating sets for the Fourier transform yield such sets for the ambiguity function, extending a result known for sets of ﬁnite measure. We apply this to sublevel sets of nondegenerate quadratic forms. case of the classical cross-ambiguity function on R , which, in turn, can be viewed as the short time Fourier transform (STFT) used in spectrogram analysis.

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Section II reviews the de Þ nition of the MIMO radar ambiguity function. Section III derives the properties of the MIMO radar ambiguity function, and Section IV concludes the paper. 1 Work supported in parts by the ONR grant N00014-06-1-0011, and the The Complex Ambiguity Function (CAF) used in emitter location measurement is a 2-dimensional complex-valued function of time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA). In classical TDOA/FDOA systems, pairs of sensors share data (using compression) to compute the CAF, which is then used to estimate the Keywords: Ambiguity function (AF), clear region, generalized AF, MIMO radar, transmit beamspace (TB). iii Preface First of all, I would like to express my most sincere gratitude to my supervisor Prof.

Speech research Fant, G. (1992).

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(1976): System and Function in Language.

## Transform (FFT). This will allow generation of ambiguity functions of advanced waveforms and signal processors. 4.1 AMBIGUITY FUNCTION DEVELOPMENT Since the ambiguity function can be thought of as the response of a signal processor to a received radar waveform, this is the approach we take in deriving the ambiguity function.

Sep 17, 2014 Dealing with ambiguity is a competency quickly pushing its way up on the list of most wanted Engage some cross-functional collaboration. Nov 11, 2013 Ambiguity.

A scheme for the generation of the impulse response function using the AF is presented in Fig. 1, where m is the time delay and k is the frequency The ambiguity function of a waveform represents exactly the output of the matched filter when the specified waveform is used as the filter input. This exact representation makes the ambiguity function a popular tool for designing and analyzing waveforms. through derivation of the ambiguity function from ﬁrst principles. Tables of ambiguity functions and their properties are presented, and 2-D Fourier analysis is shown to provide deeper insight into the ambiguity function structure.