ISAR imaging simulation method based on time domain shooting bouncing ray quick near-field calculation

Abstract

The invention relates to an ISAR imaging simulation method based on time domain shooting bouncing ray-method quick near-field calculation. The method comprises steps of (S1) setting a target triangular patch model and transient incident field capable of being any time domain waveform, (S2) employing a time domain shooting bouncing ray quick near-field calculation method to calculate a transient near-field scattering echo illuminated on the target triangular patch model by time domain plane waves, (S3) unifying the target transient near-field scattering echo in a frequency domain according to an incident signal, and (S4) repeatedly executing step 2 and 3 according to angle width and sampling density required by ISAR imaging definition to achieve echo data of a selected angle sample, and then conducting azimuth focusing to achieve a target ISAR image. Real narrow pulse broadband radar close range imaging detection can be simulated; quick calculation speed, high calculation precision and wide application range can be achieved; and pre-estimating data can be provided for target near-field scattering image diagnosis, so cost can be reduced.

Description

Technical field [0001] The invention relates to an ISAR imaging simulation method, in particular to an ISAR imaging simulation method based on a time-domain bouncing ray method for fast near-field calculation, and belongs to the electromagnetic field calculation and its application field. Background technique [0002] Near-field ISAR (Inverse Synthetic Aperture Radar, Inverse Synthetic Aperture Radar) imaging simulation technology plays an important role in the field of target scattering characteristics diagnosis, short-range detection and recognition. The time-domain electromagnetic algorithm can simulate the interaction between broadband pulses and the target. Compared with the frequency-domain electromagnetic algorithm, it has a faster calculation speed of broadband echo and is closer to the actual situation of pulse radar detection. The time-domain bouncing ray method (TD-SBR) is an effective time-domain high-frequency approximation electromagnetic algorithm. It realizes mult...

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Problems solved by technology

However, the patent with the application number 201510627908.X "A Simulation Method for Two-dimensional Echo Sequence Image of Ship Navigation Radar in Scanning State" only focuses on describing the processing algorithm of SAR imaging signals, and does not involve the acquisition of echo signals; the application The patent No. 201510377077.5 "A Method for Extracting Ship ISAR Image Structural Features" only introduces the method of using the point scattering model to simulate the echo signal

Therefore, there is no research content or analysis report on the ISAR imaging simulation method based on the time-domain near-field electromagnetic scattering algorithm.

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