Topology Design for Distributed Radar Imaging Based on Wavenumber Domain Splicing Analysis

Heuristic Path Planning Method for Multistatic UAV-Borne SAR Imaging System

“…Rm represent the bistatic angles corresponding to the starting and ending point of recording echo data, respectively [21]. ∆ϕ T and ∆ϕ Rm are the azimuth change value of the transmitter and receivers relative to the origin O in the process of recording echo.…”

“…From S k to S k+n , there are n continuous path points that can provide effective azimuth variation. And in (21), − −−−− → S k S k+n represents the Euclidean distance of the space vector from S k to S k+n . cos θ k,k+n is the angle between the space vector − −−−− → S k S k+n and the ground-piston.…”

“…where f (x) is the objective function in (21) and h(x) = − −−−−−−−− → P current P end is the Euclidean distance from the current path point P current to the ending point P end . Then, sorting the evaluation functions v(x) of all extended points, and finding out the extended point corresponding to the minimum evaluation function P v(x) min .…”

“…Compared with the traditional monostatic SAR, the platforms of multistatic SAR system are completely dispersed in space, which can change the relative spatial configuration of each radar platform more flexibly and adjust the flight path to realize the multi-view observation of the region of interest without blind spots. Moreover, by fusing multi-view information of multistatic radar platforms, higher resolution observation images can be obtained in a shorter time [19][20][21][22][23][24]. Recently, there have Manuscript received April 30, 2021; revised June 20 and August 3, 2021; accepted August 14, 2021.…”

“…In [27,28], the generalized ambiguity function and resolution expression of BiSAR are analyzed and derived, which provides a basis for further deriving the fusion resolution of multi-static SAR [26]. On the basis of [28,29], the azimuth resolution of the multistatic SAR imaging system with separated transmitters and receivers is deduced according to the distribution regularities of echo in wave number domain, and the feasibility of echo data fusion of multiple radar platforms to improve imaging resolution are verified [21,27]. Even when the observation time of a single platform is insufficient, MuUAV-SAR can splice the echo data from multiple transmitters to achieve the same high-resolution observation effect, which is the benefit brought by MuUAV-SAR while it also brings more resource consumption.…”