Research on micro-Doppler feature of spatial target

Abstract

The micro-Doppler (m-D) effect which is also called micro-motion effect is a kind of physical phenomenon, which is often produced in ISAR imaging of space targets. When the space target has a micro-Doppler effect, it will produce frequency modulation for the radar echo and cause serious interference to ISAR imaging of the target. In this paper, the micro-spin model is modeled, and the echo of micro-spin model scattering point is processed respectively by short-time Fourier transform (STFT), Wigner-Vile Distribution (WVD), and pseudo-Wigner-Vile Distribution (PWV), and the micro-Doppler curve is derived. On this basis, for the space target with spin components, this paper introduces an ISAR imaging algorithm using the micro-Doppler removal based on STFT and proposes an improved algorithm based on rigid body parameter estimation, which can obtain better imaging results.

Study on the micro-Doppler separation method of bistatic inverse synthetic aperture radar targets with rotating parts based on complex variational mode decomposition

“…To solve the problem of unknown motion states, scholars have proposed many algorithms to suppress and separate the micro-Doppler effect, including time-frequency analysis and frequency decomposition. The time-frequency analysis introduces a threshold to separate the frequency components in the time-frequency map, enabling the separation of the main echo and the echo containing the micro-Doppler effect 11 – 13 However, the time-frequency analysis is overly dependent on the window function, resulting in the mutual restriction between the temporal and frequency resolutions.…”

“…The time-frequency analysis introduces a threshold to separate the frequency components in the time-frequency map, enabling the separation of the main echo and the echo containing the micro-Doppler effect. [11][12][13] However, the time-frequency analysis is overly dependent on the window function, resulting in the mutual restriction between the temporal and frequency resolutions. In addition, some main signals of the target may be removed during the signal separation, leading to diminished main energy and sparse aperture.…”

Three-dimensional reconstruction for space targets with multistatic inverse synthetic aperture radar systems

“…For space targets, it is important to conduct identifications for these interesting components, such as cabin and solar panels in the event of their aberrancy. Since inverse synthetic aperture radar (ISAR) provides high-quality twodimensional (2D) image for space targets [1], it becomes possible to analyze characteristics of partial interesting components. In space security-related reconnaissance and surveillance, there are a number of issues.…”

An unmanned aerial surveillance system in urban environments

“…In Table 3 are given the parameters of transponders used in UAV [18,19]. After the detection and identification of an object, surveillance systems further recognize it, and then, if necessary, follow the object's trajectory.…”