Ground Moving Target Imaging Using Ultranarrowband Continuous Wave Synthetic Aperture Radar

Abstract

Abstract-We present a novel method for ground moving target imaging using a synthetic aperture radar system transmitting ultranarrowband continuous waveforms (CW). Our method exploits the high Doppler resolution provided by ultranarrowband CW signals to image both the scene reflectivity and to determine the velocity of multiple moving targets. We develop a new forward model based on the temporal Doppler induced by the movement of antennas and moving targets. The forward model relates reflectivity and velocity information at each location to a correlated received signal. We form the reflectivity images of the moving targets and estimate their motion parameters using a filtered-backprojection (FBP) technique combined with the contrast or gradient optimization method. The method results in focused reflectivity images of moving targets and their velocity estimates, regardless of the target location, speed, and velocity direction. We show that the amplitude and visible edges of the targets can be correctly reconstructed when the correct target velocity estimate is used in the FBP imaging. We present the resolution analysis of the reflectivity images. Extensive numerical simulations demonstrate the performance of our method and validate the theoretical results.

Passive synthetic aperture radar imaging based on low-rank matrix recovery

“…Furthermore, it does not require the locations of transmitters of opportunity. The new method can be extended to ultranarrowband SAR imaging, imaging of moving targets and passive multistatic imaging [14]- [16], [32], [33]. Through numerical simulations we demonstrate that the new method can reconstruct scenes with extended targets while TDOA backprojection fails.…”

Moving Target Artifacts in Bistatic Synthetic Aperture Radar Images

“…In the past two decades, several SAR moving target detection and imaging methods have been developed [1]- [4], [7], [20], [23]- [42]. From the perspective of the current study, these methods can be classified into two categories.…”

“…This class includes autofocus type methods [27], [35], the keystone transform based methods [23], [34], time-frequency transform based methods [29], [30], inverse synthetic aperture imaging type methods [36]- [38], and GLRT type methods in which the reflectivity images are formed for a range of hypothesized motion parameters while simultaneously estimating the unknown motion parameters [1]- [4], [27], [31], [33], [39], [43].…”

“…(iv) The analysis is based on microlocal analysis [16]. Therefore, the underlying methodology is general and can be used to analyze moving target positioning errors in other SAR modalities [1]- [4], [8]- [11], [40].…”

Deception jamming method based on micro‐Doppler effect for vehicle target

“…Thanks to the characteristics of small volume, light weight, low-cost, continuous wave (CW) ground surveillance radar has found wide applications ranging from square surveillance, airport surface surveillance, and battleground surveillance to situation awareness [1][2][3][4]. The protection of vital manoeuvring targets such as catering vehicle team, missile launchers etc.…”