Politehnika i dizajn, Vol. 5 No. 3, 2017.
Stručni rad
https://doi.org/10.19279/TVZ.PD.2017-5-3-06
PROPAGATION MODEL OF HARMONIC RADAR FOR DETECTION THE NONLINEAR CONTACTS OF THE IMPROVISED EXPLOSIVE DEVICES
Milan Bajić
; Znastveno vijeće HCR Centar za testiranje, razvoj i obuku d.o.o., Zagreb
Sažetak
This paper, based on the experimental research
data, analyses the improvised explosive
devices (IED) detection by harmonic radar.
The propagation model was applied to spatial
distribution of electric field strength of harmonic
radar and IED above the flat and electrically
smooth ground surface. The linear vertical
polarisation for manual survey for distances
up to 20–30 m is considered; the loss of spatial
coverage by detection is estimated. The harmonic
radar receives waves generated by nonlinear
electronic components or by junctions of oxidized
surfaces of different metals in IED. The
detection range of harmonic radar is limited
by nonlinearity of IED elements whose pseudo
nonlinear radar cross section s2 depends
on po-wer density [W/m2] on a target, by
saturation, by oscillatory instead of monotonic
decay distribution of electric field strength of
electromagnetic waves. The availability of
theoretic models for harmonic radar is limited
to the use in free space; experimentally derived
models for limited selection of targets are
dominating. The needs and requirements for
harmonic radars are well defined for military and
security domains, but since 2014 they have been
in ever growing demand for the humanitarian
countermine action as well.
Ključne riječi
improvised explosive device; harmonic radar; nonlinear radar cross section; nonmonotonic E distribution; loss of detection
Hrčak ID:
195155
URI
Datum izdavanja:
19.12.2017.
Posjeta: 874 *