1,720,970 research outputs found
A New Strategy to Mitigate Side-Peak Lock Errors in Tracking Multi-Peak Code Correlation Functions
No full textThe paper presents a novel strategy capable to effectively mitigate possible false locks of the receiver tracking stage in case of multi-peak code correlation functions, as for example high-order Binary Offset Carrier (BOC) modulations, used in modern Global Navigation Satellite System signals (e.g. Galileo and modernized GPS). The proposed strategy represents an enhanced version of well-known “bump-jumping” approach and it differs from the other solutions at the state of the art.
Simulation results are provided in order to demonstrate and validate the performance and the flexibility of the proposed strategy in three cases: BOC(1,1) (Galileo E1 Open Service), BOCc(15,2.5) (Galileo E1a-like) and BOCc(10,5) (Galileo E6a-like) modulated signals
Impact of the Group Delay on BOC(M,N) Tracking: Potential Filter Issues in Robust Side-Lobe Switching for High-Order BOC Modulations
No full textThis paper discusses some technical problems and proposes a solution related to the implementation of a robust switching between single-side and double-side lobe tracking modes in case of BOC modulated signals, in particular BOC(M,N), with M, N > 1. It is demonstrated that typical group delay distortions due to wide-band front-end filters can potentially lead to code tracking biases, increasing the risk of false locks and degrading the performance of the BOC tracking loops. These effects represent also a potential problem for the coexistence of the side-lobe switching functionality with other advanced algorithms in professional-grade GNSS receivers. These practical issues are investigated and a possible solution is demonstrated by means of simulation results, considering the BOC(M,N) modulations in the Galileo E1a and E6a bandwidths
A new open-loop multipath mitigation strategy suitable to modern GNSS signals
No full textThe paper presents a new multipath mitigation strategy suitable to current Global Navigation Satellite System signals (e.g. Galileo and modernized GPS), including high order Binary Offset Carrier (BOC) modulated signals. The proposed strategy differs from the other approaches in the state of the art, based on the same number of correlators (five): while the code tracking discrimination function is realized by means of a traditional closed-loop architecture based on three correlators (Early, Prompt, and Late), the multipath mitigation is implemented in open-loop, exploiting the measurements of two additional correlators not directly used in the discriminator for the code tracking loop. Simulation results are provided in order to demonstrate and validate the performance and the flexibility of the proposed strategy in three cases: CBOC(6,1,1/11) (Galileo E1 Open Service), BPSK(1) (GPS L1 C/A) and BOCc(15,2.5) (Galileo E1a-like) modulated signals
Ricevitore elettronico con correlatori in anello aperto per la mitigazione dell'interferenza da cammini multipli e metodo di stima di un errore di allineamento
No full textDomanda di brevetto per invenzione industriale depositata il 29 luglio 2013,
Proprietario del brevetto SELEX ES S.P.A
Miniatelier pedagogico sulla Medicina narrativa
No full textQuaderni delle Conferenze Permanenti della Facoltà di Medicina e Chirurgi
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Interfering signal detection device for a global navigation satellite system
No full textAn interfering signal detection device, including: a receiver stage for an input signal (s i (t)) an oscillator (52), which generates a local signal (s l (n)) having a local frequency (f sweep ) and a plurality of correlation branches (24) to generate, at each integration period (T=L/f s ), samples of corresponding correlation signals (s d , -1 (w), s d,0 (w), s d,1 (w)), indicative of the correlation of the input signal with a plurality of local periodical signals (cr -1 (n), cr 0 (n), cr 1 (n)) time shifted with respect to each other. The device also includes: a correlator (54), which determines a value vector on the basis of samples of the correlation signals generated during a detection period (T r ) formed by at least one integration period and a detection stage (54), which computes the eigenvalues of an estimated covariance matrix, on the basis of the value vector, and detects the interfering signal by comparison with a threshold. During the detection period, the oscillator varies the local frequency independently of the input signal
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Generi, nozioni, funzioni e strutture dell’italiano A1 e A2
No full textRecensione a Spinelli B. / Parizzi F., Profilo della
lingua italiana, La Nuova Italia, Scandicci
2010, pp. 224
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