Wednesday, February 19, 2020

A SWITCHED-ANTENNA NADIR-LOOKING INTERFEROMETRIC SAR ALTIMETER FOR TERRAIN-AIDED NAVIGATION


Author :  Inchan Paek

Affiliation :  PGM Image Sensor Centre, Hanwha Thales, Kyunggi-do

Country :  Korea

Category :  Computer Science & Information Technology

Volume, Issue, Month, Year :  6, 1, November, 2016

ABSTRACT

Conventional terrain-aided navigation (TAN) technique uses an altimeter to locate the position of an aerial vehicle. However, a major problem with a radar altimeter is that its beam (or pulse) footprint on the ground could be large, and therefore the nadir altitude cannot be estimated accurately. To overcome this difficulty, one may use the nadir-looking synthetic aperture radar (SAR) technique to reduce the along-track beam width, while the cross-track ambiguity is resolved with the interferometry technique. However, the cross-track resolution is still far from satisfactory, because of the limited aperture size of antennas. Therefore, the usual three-antenna array cannot resolve multiple terrain points in a same range bin, effectively. In this paper, we propose a technique that can increase the cross-track resolution using a large number of antennas, but in a switched fashion, not raising hardware cost.

Keyword :  TAN, SAR, Altimeter, Switched Array

For More Details :  https://airccj.org/CSCP/vol6/csit64814.pdf


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