INVERSION OF SYNTHETIC APERTUR,E R,ADAR (SAR) - MSpace ...
INVERSION OF SYNTHETIC APERTUR,E R,ADAR (SAR) - MSpace ...
INVERSION OF SYNTHETIC APERTUR,E R,ADAR (SAR) - MSpace ...
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eú ø1. [103]). Similal clevelopment in laclal technology rvas acliievecl in 1938<br />
by Sil Watson-Watt in Elgland (Ridenour [95]). In the mid-1930s, G. Mar'-<br />
coli also succeedecl in detecting moving vehicles and ailcraft using his raclar'<br />
[73], During lVolld War II, pulse-latlar systems lvere irlproved remalkably<br />
upon urgent militaly requests, and airbolne radals cleployecl to cletect enemy<br />
airclafts ancl ships.<br />
It was not until i950s that a new type of irnaging lac{ar', the side-Iooking<br />
ai,rbon¿e rødør (SLAR), producing continuous stlip irnages was developed.<br />
Tlre early SLAR was real aperture rødør (RAR)-, in which fihn recording<br />
was primary means of display. The aclvent of SLAR systern openecl a nerv<br />
ela of irnaging laclar', antl it has been subsequently cleveloped irto synthetic<br />
aperture rad,a¡'o,- syntltetic arrag rad,ar (<strong>SAR</strong>). Many different real apelture<br />
SLAR systerns were developed during the 1950's, but irnages produced by<br />
those systerns rvere not available on an unclassifiecl basis till early 1960's.<br />
h 1964, a declassified leal aperture SLAR systern AN/APQ-97 was clevelopecl<br />
by Westinghouse, initially fol U.S. Arrny Electlonics Cornmand (Ulaby<br />
el al. [103]). This systern became cornrnercially available, ancl it was used extensively<br />
fol rlapping in various parts of the world, plirnarily lvith geological<br />
stuclies in mind.<br />
Although the leal apelture radar system was rvidely usecl as a prominent<br />
remote sensing tool thlough the 1960's, RAR lequires both a lolg antenna<br />
*The term real aperlure rodar (RAR) is used in coutrast to sgnlltelic aperlure radar<br />
(<strong>SAR</strong>), and the term SLAR occasionally represents real aperture sicle-looking radar as<br />
common Dame of RAR. In the follorving discussion, the term SLAR will be used to cover<br />
common features of RAR antl <strong>SAR</strong>, ancl terms RAR ancl <strong>SAR</strong> used for the incìividuaÌ<br />
systems as appropriate (Moore [81])<br />
T2