A remote imaging system based on reflected GPS signals

M. Usman, D. W. Armitage

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    This paper describes a method for utilizing reflected Global Positioning System (GPS) signals to form an image of targets within a region of interest. The principle is based upon a type of bi-static synthetic aperture radar (SAR) in which a matched filter technique is employed to perform the image reconstruction. This method relies upon the fact that each component of the received signal resulting from a reflection from an individual target is subjected to a unique chirp. A major challenge to be tackled is the appalling signal to noise ratio associated with the received reflected GPS signals. Another difficulty is the masking of the reflected signals by power in the tails of the autocorrelation function of the direct signals which cannot be totally suppressed. Moreover, the reconstruction method results in an undesirable point spread function (PSF) which seriously smears the reconstructed image. We simulate the entire GPS signal generation and Image reconstruction process as faithfully as possible within the limitations of the available computational effort. We are able to demonstrate that a spatial resolution of the order of the L1 wavelength (19 cm) is theoretically possible from realistic observation distances provided that sufficient coherent correlator integration time is allowed and that the direct signals can be sufficiently suppressed. For the rather simplified organization of targets within the simulation we are able to show that the image smeared by the PSF is able to be cleaned by means of a Wiener filter based deconvolution method. © 2006 IEEE.
    Original languageEnglish
    Title of host publication2006 International Conference on Advances in Space Technologies, ICAST|Int. Conf. Adv. Space Technol., ICAST
    Pages173-178
    Number of pages5
    DOIs
    Publication statusPublished - 2006
    Event2006 International Conference on Advances in Space Technologies, ICAST - Islamabad
    Duration: 1 Jul 2006 → …

    Conference

    Conference2006 International Conference on Advances in Space Technologies, ICAST
    CityIslamabad
    Period1/07/06 → …

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