ISAR motion parameter estimation via multilateration

Abstract

One of the main difficulties in Inverse Synthetic Aperture Radar imagery of a maneuvering target is the estimation of its motion parameters from the radar data. In this paper we show how the geometric features of a multistatic radar system can be used to obtain both translational and rotational motion with a multilateration approach. While many monostatic approaches in open literature attempt to estimate parameters for a pre-assumed form of motion, our approach aims to be as general as possible. Capabilities and limitations for several implementation techniques of the multilateration method are examined and illustrated in simulations

Total rotational velocity estimation in a multistatic ISAR system

“…Hence, can be readily computed if the target translational motion is known. Methods such as those described in [20, 21] can be used to estimate the target trajectory and velocity. In the following analysis, we shall assume that are measurements for all receivers, with some unbiased statistical errors, after which the only missing component is the receiver independent component , which we aim to estimate.…”

“…However, the work assumed that the target does not undergo any translational motion. The works in [20, 21] used a multi‐static radar network to estimate the target translational motions. Such information is then used to enable multi‐static radar imaging techniques, for multi‐static ISAR autofocus and multi‐static radar image formation.…”

Estimation of the total rotational velocity of a non‐cooperative target with a high cross‐range resolution three‐dimensional interferometric inverse synthetic aperture radar system

“…Some attempts to estimate target motion have been reported in the literature, such as in [13, 14], which make use of a multistatic radar network to estimate the target translational motions. Such information is then used to enable multistatic radar imaging techniques, in particular both multistatic ISAR autofocus and mulstistatic radar image formation.…”

Precise Radial Velocity Estimation for Inverse Synthetic Aperture Radar

“…Thus the ISAR system is usually accompanied by a narrowband mode or narrowband radar, which conducts the functions of searching and tracking the target but rarely provides precision high enough for the target velocity while inducing implementation difficulties in the radar system. An alternative solution is to estimate velocity directly from the wideband echo by signal processing, which has the advantage of decreasing the burden of the radar system, and this work has attracted much attention in the radar community [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

“…Recently, the work has been extended to direct sampling radar [13], but the disadvantage still exits. Some investigations were relied on signal waveforms [14][15][16] or system structures [17,18]. A method not based on range profile was presented in [19], but it suffered from heavy computation load.…”