Detection of small changes in natural formations and human-made constructions is a promising application of synthetic aperture radar (SAR). This paper deals with a specific radar, which is a ground-based SAR using noise waveform. Being fully coherent, SAR provides both phase and amplitude information for every pixel in the mapped area. This gives rise to the possibility of comparing phases between the images taken from the same position at different times in order to extract information about the changes that have occurred between subsequent radar measurements. Such a technique, called coherent change detection (CCD), allows changes of a subwavelength size to be detected. The use of a noise waveform for sounding ensures high electromagnetic compatibility and interference immunity. Moreover, it enables long integration time in the detection stage. However, the random nature of probing signals used in noise radars leads to randomness of the output signals and the preservation of residual fluctuation in the images generated. This random residual, along with external noise, influences the overall accuracy of the phase measurement in noise radar. In this paper, the theoretical and experimental investigation of this specific influence of noise on the precision of phase measurements is presented. The theoretical part of the paper is focused on the estimation of the Cramer-Rao lower bound for the phase measurements using both statistical theory and geometrical interpretation of complex signals. In the experimental part, these findings are verified with dedicated measurements of a metallic sphere displacement, carried out with the help of a ground-based noise waveform SAR.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Phase measurement accuracy in noise waveform synthetic aperture radar




    Publication date :

    2015-10-01


    Size :

    1437595 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Multidimensional Waveform Encoding for Spaceborne Synthetic Aperture Radar

    Krieger, Gerhard / Gebert, Nicolas / Moreira, Alberto | German Aerospace Center (DLR) | 2007

    Free access

    Wavelet-based gaussian waveform for spotlight synthetic aperture radar

    Cao, Siyang / Zheng, Yuan F. / Ewing, Robert L. | IEEE | 2014


    Multidimensional Waveform Encoding for Synthetic Aperture Radar Remote Sensing

    Krieger, Gerhard / Gebert, Nicolas / Moreira, Alberto | German Aerospace Center (DLR) | 2007

    Free access


    Target Detection Accuracy Improvement in Synthetic Aperture Radar

    Kargin, S. / Kartal, M. / Kurnaz, S. | British Library Conference Proceedings | 2003