Predicting the Effects of System Changes on Passive Radar Coverage
Virkki, Joonas (2017)
Virkki, Joonas
2017
Teknis-luonnontieteellinen koulutusohjelma
Luonnontieteiden tiedekunta - Faculty of Natural Sciences
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Hyväksymispäivämäärä
2017-02-08
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201701231068
https://urn.fi/URN:NBN:fi:tty-201701231068
Tiivistelmä
Passive radar has in general a coverage much more complex than that of a tradition radar. Predicting the coverage and therefore the areas lacking vision is time-consuming to compute with reasonable accuracy, and requires complete recalculations if the system topology changes. In this work a generalised Cramér-Rao bound for joint position and velocity estimations is used to compute an unbiased estimator parameter variance lower bound. The estimations are combined in differing ways to qualitatively mimic modularised coverage in case of topological change. The combinations and full single-simulation results are compared by the area limited by a chosen lower bound. The areal differences in single computations versus partitionedly computed predictions range from subtle to significant. The type of change and system configuration seem to have the most effect on the accuracy, since some predictions achieve less that 10% difference regardless of the bound. Primarily the methods evaluated did not achieve desirable results, and the outcome could be described as a suggestive outline of the way to approach the problem in further research. Not much could be said about the feasibility of similar modularisation without validated data, and more in-depth analysis of the lower bound.