![]() ![]() 6th ESA Advanced Training Course on Land Remote Sensing. Synthetic Aperture Radar (SAR): Principles and Applications. Principles & Applications of Imaging RADAR. Using simple mathematical considerations, the relationship between I/Q and amplitude and phase can be established.Įach signal echo and pixel of a complex SAR image can be represented with such a phasor and the necessary amplitude and phase information can be accordingly retrieved. The length of the vector correspond to the signal’s amplitude and its direction (angle between the horizontal axis and the vector) characterizes the phase of the signal. It can be best illustrated by a 2D vector in a Cartesian coordinate system, which projections on the horizontal and vertical axes represents the real and imaginary part, respectively. A phasor represents a complex number and its phase and amplitude equivalent. ICEYE’s Daily Coherent Ground Track Repeat capability means that our SAR satellites capture images from precisely the same imaging geometry every 24 hours unlocking completely new. Images of the ground taken from the same location in space will always be identical unless something changes. The relationship between I/Q terms and the magnitude and phase of the signal can be best represented using a phasor. SAR satellites are designed for change detection. Using both components as input, the magnitude and phase for each signal echoes and location can be retrieved. The Q component corresponds to the amplitude of the signal multiplied by the sine of its phase. The I component can be expressed as the signal amplitude multiplied by the cosine of the phase. This is necessary in order to retrieve the phase information during A/D conversion. The terminology comes from electrical engineering, whereby the quadrature component is 90° out of phase with respect to the reference frequency and the in-phase component. In single look complex SAR data, each of these components is pictured in a single image channel. In the SAR context, the complex number is usually represented by a real part, the in-phase component (I), and an imaginary part, the quadrature component (Q), from which the corresponding magnitude and phase can be retrieved. ![]() This implies that the signal can be entirely represented by a complex number, which characterizes both its magnitude and its phase at a certain moment of time. I think that is how it works even though I only did it once and I just may be wrong 1. Dasent matter whose you use, just so you all connect to the same IP. You all have to be in communication via chat or whatever and you all need to be using the same IP. The signal emitted by a radar system is a microwave signal, which can be described using a complex wave representation. Earthnet is very, very buggy so expect that. ![]()
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