Abstract
Inverse synthetic aperture radar is a commonly adopted technique for producing high-resolution images of moving targets. This article investigates the imaging capabilities of high-frequency and high-bandwidth systems by means of two distinct experiments. The deployed sensor is the Fraunhofer FHR MIRANDA-35, a millimeter-wave synthetic aperture radar airborne system, which transmits frequency-modulated continuous-wave signals at the Ka-band and is capable of achieving centimeter resolution. The performances are assessed by comparing the derived estimates (e.g., radial velocity and acceleration, and dimensions) with independent ground measurements. The resulting accuracy can be summarized as follows: the mean value of the percent error is 2.05% and 2.11% for radial velocity and acceleration, respectively, and 4.27% for the target dimensions.
Highlights
S YNTHETIC aperture radar (SAR) systems are frequently exploited solutions for earth surface monitoring in allweather and all-light conditions
frequency-modulated continuous-wave (FMCW) SAR differentiates from pulsed SAR due to the transmission of a frequency-modulated signal, which covers most of the pulse repetition interval (PRI)
The estimated motion parameters were compared with the ones provided by the GPSs, defining a percent error of
Summary
S YNTHETIC aperture radar (SAR) systems are frequently exploited solutions for earth surface monitoring in allweather and all-light conditions. Such systems are capable of producing electromagnetic images with enhanced spatial resolution [1] and, are a useful tool for, among many applications, surveillance and reconnaissance purposes [2], [3]. The need for a broad accessibility to SAR has led to the design of frequency-modulated continuous-wave (FMCW) waveforms [4]. FMCW SAR differentiates from pulsed SAR due to the transmission of a frequency-modulated signal, which covers most of the pulse repetition interval (PRI). A detailed analysis of the FMCW SAR signal model, its resulting signal processing aspects, and viable hardware solutions can be found in [5]
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