Overview
FrançaisABSTRACT
This article addresses the problem of providing additional information for measuring angles in passive trajectory techniques (APT). There are several kinds of these additional measurements: measurements for detecting a possible manipulation of the source (not always detectable), frequency measurements radiating from the source, and angular measurements from another platform (triangulation). These three cases are addressed in practice, with a theoretical presentation of the problem and associated tests and calculations, as well as their applications. Ultimately, it is demonstrated for each of them that the observer no longer need to manipulate them, as in APT.
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Read the articleAUTHORS
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Claude JAUFFRET: Professor at Université du Sud-Toulon-Var
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Denis PILLON: Thales Underwater Systems Engineer
INTRODUCTION
In the first part of
either, those relating to the detection of a possible manoeuvre of the source;
or the frequencies emitted by the source ;
or angular measurements from another geographically distant platform.
We'll show that in these three cases, the observer no longer needs to maneuver as in TPA, which represents an unquestionable advantage.
The first paragraph of this dossier deals with the problem of source maneuver detection. One particularity of this problem lies in the fact that this maneuver is not always detectable: indeed, we show that there exists a whole family of kinematics (non-MRU) of the source undetectable by the observer, even in the absence of noise. For other geometries where maneuver detection is potentially possible, we present parametric and non-parametric statistical tests that exploit estimation residuals, i.e. the differences between measurements and their estimates. We give the general performance of these tests and illustrate these theoretical results with a typical example.
When a manoeuvre is detected at time t M , rather than forgetting all previous measurements and re-estimating the new trajectory followed by the source, we can take into account, as an additional measurement, the kinematic elements relating to the goal acquired before it manoeuvred. This is the subject of the second paragraph, which deals with the usual case where the source's velocity does not change – in modulus – before and after the manoeuvre. We then turn to the case of greatest practical interest, where the observer (carrier) never manoeuvres, either before or after detecting the source manoeuvre. We show that the observer can then estimate the kinematic...
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Passive trajectography using angles and other measurements
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