Spectrum envelope feature-based radar target high-resolution range profile recognition method
A high-resolution range image and radar target technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as large amount of calculation, difficulty in selection, and poor recognition effect, and achieve simple calculation, easy implementation, and dimensionality retention Effect
Inactive Publication Date: 2017-02-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0005] Aiming at the problems of large amount of calculation, poor recognition effect due to loss of useful information and difficulty in selecting the most effective features in the above-mentioned prior art, the present invention provides a radar target high-resolution range profile recognition method based on spectral envelope features
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[0075] The data used in the experiment is the high-resolution range image data collected by a domestic C-band ISAR radar in the field experiment of three aircraft (An, Cessna, Yak). Each aircraft contains 260 range images. In the experiment, the data of each aircraft is divided into 10 groups by sampling at equal intervals, that is, each group has 26 samples, and then 10 experiments are carried out respectively. In the first experiment, take the first group of each aircraft, a total of 26×3=78 range images as a template, and the other 9 groups, a total of 26×9×3=702 range images are used for testing, using the nearest neighbor method Carry out classification; in the second experiment, take the second group of each aircraft as a template, and the other 9 groups are used for testing; Finally, the results of 10 experiments are averaged to obtain the final recognition rate.
[0076] Table 1 shows the results of radar target recognition using the above five spectral envelope featu...
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The invention discloses a spectrum envelope feature-based radar target high-resolution range profile recognition method. A spectrum envelope is constructed based on the power spectrum of a target range profile; five feature attributes are extracted from the spectrum envelope, wherein the five feature attributes are brightness, irregularity, total power, the proportion of the sum of the power of fifth-order harmonic components to harmonic components of the highest order in the total power, and the proportion of the power of strongest spectrum components in the total power; the five feature attributes are combined together to form a five-dimensional spectrum envelope feature F5; two four-dimensional spectrum envelope features are constructed based on the spectrum envelope, wherein the two four-dimensional spectrum envelope features include harmonic components H4 of the first four orders and four strong spectrum components S4; the F5 feature is combined with the H4 feature and the S4 feature separately, so that two new 9-dimensional spectrum envelope features FH9 and FS9 can be obtained; and the above 5 spectrum envelope features are adopted to carry out radar target identification, and the validity of each feature is evaluated by using actually measured data. The method of the invention is simple in calculation and easy to implement, and is very suitable for the engineering application of radar target recognition. According to the method, the concept of the spectrum envelope is introduced.
Description
technical field [0001] The invention belongs to the technical field of radar, in particular to a target recognition method of a high-resolution range image of a radar target. Background technique [0002] The high-resolution range image of a radar target well reflects the radial distance distribution details and structural information of the target along the radar line of sight, which is of great value for target recognition and has the advantage of being easy to acquire and process. Recognition has become a research hotspot in the field of radar target recognition. [0003] The motion characteristics of the radar target cause the acquired range image to shift relative to the radar reference position, which makes the range image have translation sensitivity. Aiming at this problem, related literatures propose a variety of translation-invariant features for radar target recognition, among which, the power spectrum feature is widely used because of its simple and effective ca...
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IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 于雪莲郝英杰曲学超李海翔周云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA