Estimation method of micro-moving geometric parameters of wideband radar ballistic target based on phase ranging

Abstract

The invention discloses a method for estimating micro-movement geometric parameters of broadband radar ballistic targets based on phase ranging, which belongs to the field of radar technology. Theoretical results of the macro-distance curve of the i-th scattering center: the range-time echo signal of the i-th scattering center is segmented and Keystone transformed using the segmented approximate macro-curve extraction method, and the rough estimated instant of the i-th scattering center is obtained The macro curve uses the phase ranging macro curve extraction method to obtain the high-precision macro curve of the i-th scattering center, and then obtains the estimated value of the precession frequency of the cone target and the estimated value of the target half-cone angle The estimated value of the busbar length of the cone target, the estimated value of the height of the cone target and the estimated value of the radius of the bottom surface of the cone target are used as the estimated results of the fretting geometric parameters of the broadband radar ballistic target based on phase ranging.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a method for estimating micro-motion geometric parameters of a broadband radar ballistic target based on phase ranging, which is suitable for robustly estimating motion parameters and physical parameters of space precession targets. Background technique [0002] While the target performs radial motion relative to the radar, there are also motion forms such as vibration or rotation. These motions are called micro-motion; when the space target flies outside the atmosphere, in addition to the need to do spin motion to maintain its own stability, it also It will do a conical rotation around a certain axis of symmetry due to lateral interference, also known as precession. Precession is a common form of fretting for space targets. At present, there are many researches on the analysis, extraction and measurement of radar fretting features. Based on the commonly used narrowband...

AI Technical Summary

Problems solved by technology

[0002] While the target is doing radial motion relative to the radar, there are also motions such as vibration or rotation. These motions are called micro-motions; It will do conical motion around a certain axis of symmetry due to lateral interference, also known as precession. Precession is a common form of micro-motion in space targets; at present, there are many researches on radar micro-motion feature analysis, extraction and measurement. Based on commonly used narrow-band and wide-band radar signal systems; narrow-band radar signals, including continuous wave and coherent pulse signals, can theoretically reveal the principle of micro-Doppler generation by micro-moving targets, and can obtain better Doppler resolution, However, the distance resolution cannot be performed, and it is difficult to perform effective feature extraction when the target structure is complex; due to the high resolution in the distance of broadband radar, during the imaging time, the movement of the micro-moving target in the radial direction often causes the over-distance unit to move, and the performance The curve corresponding to the scattering center on the HRRP sequence plane creates the conditions for the micro-motion feature extraction

[0003] For a long time, time-frequency analysis has been the main method for analyzing micro-movements. Time-frequency analysis methods such as short-time Fourier or Wigner transform are used to obtain the frequency spectrum of micro-Doppler frequency changes with time caused by micro-movements, thereby estimating the target's Fretting period and amplitude; this method has high calculation efficiency and good anti-noise ability, but it is susceptible to the interference of time-frequency cross items and the limitation of time-frequency resolution; in the 1990s, the Lincoln Laboratory of the United States proposed a The new technical idea is to use the phase information of the wideband radar range image to accurately describe the motion state of the scattering center. The key to the success of this technology is that the wideband radar has a higher distance resolution ability than the narrowband radar, and can accurately detect the target surface. Scatter points for independent analysis

Images