Doppler-Bearing Tracking for Analog TV-based Passive Radars
other
Passive radar systems can exploit various kinds of signals of opportunity, including analogue television signals. Analogue TV signals are not considered favourable though, because they include relatively strong line sync pulses which prevent the unambiguous measurement of range information via correlation techniques. However, the absence of a range estimation step can relax system and processing requirements considerably and it may therefore be worthwhile to investigate other means of obtaining range estimates
using these kind of signals. In this paper we introduce a method that uses bistatic Doppler and bearing measurements to obtain target tracks in 2D. Unlike the approach taken by Howland [IEE Proc.-Radar, Sonar, Navig., Vol.146, No.3, June 1999], our method does not rely on a fitting algorithm to initiate target tracks in 2D. Instead, tracks in the Doppler-bearing domain are readily transferred to the Cartesian 2D domain. This has the advantage that target indications are available without considerable delay. We show that target range and target velocity can be obtained from two consecutive measurements of Doppler and bearing, or equivalently from four observables. For this purpose, we derive a non-linear system of equations which we solve analytically to a single non-linear equation with one variable. We show that this equation has two roots, which can be found numerically. Only one of them is physically meaningful, in the sense that it delivers a consistent track. We study the robustness of the method to noise and target accelerations using synthetic tracks.
using these kind of signals. In this paper we introduce a method that uses bistatic Doppler and bearing measurements to obtain target tracks in 2D. Unlike the approach taken by Howland [IEE Proc.-Radar, Sonar, Navig., Vol.146, No.3, June 1999], our method does not rely on a fitting algorithm to initiate target tracks in 2D. Instead, tracks in the Doppler-bearing domain are readily transferred to the Cartesian 2D domain. This has the advantage that target indications are available without considerable delay. We show that target range and target velocity can be obtained from two consecutive measurements of Doppler and bearing, or equivalently from four observables. For this purpose, we derive a non-linear system of equations which we solve analytically to a single non-linear equation with one variable. We show that this equation has two roots, which can be found numerically. Only one of them is physically meaningful, in the sense that it delivers a consistent track. We study the robustness of the method to noise and target accelerations using synthetic tracks.
TNO Identifier
213841
Publisher
NATO-RTO
Article nr.
23
Source title
RTO SET-095 Specialists' Meeting Bistatic-Multistatic Radar and Sonar Systems, 7 - 9 June 2006, Nurc, La Spezia, Italy
Place of publication
Neuilly-sur-Seine
Pages
23/1-23/8
Files
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