Air Maneuvering Target Detection Method Based on Cubic Phase Transformation and Virtual Phase Function
A technology of virtual phase function and detection method, used in radio wave measurement systems, instruments, etc., can solve the problems of high sampling pulse number and signal-to-noise ratio threshold, requirements, and difficulty in direct application of CPT methods, so as to improve accuracy and increase coherence. The effect of accumulating time
Inactive Publication Date: 2017-08-25
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology
Although the DPT method can provide high estimation accuracy, it has high requirements on the number of sampling pulses and the threshold of signal-to-noise ratio due to the need for a fourth-order nonlinear transformation of the signal.
The CPT method only performs second-order nonlinear transformation on the signal. Compared with the DPT method, it can maintain a high parameter estimation performance under low signal-to-noise ratio. Difficult to apply directly
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[0030] The method for detecting and estimating high maneuvering targets in the air based on cubic phase transformation and virtual phase function provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] Such as figure 1 As shown, the air high maneuvering target detection and parameter estimation method based on cubic phase transformation and virtual phase function provided by the present invention includes the following steps carried out in order:
[0032] 1) Perform clutter suppression on the total echo data received by the airborne early warning radar to obtain the signal after clutter suppression;
[0033] In this stage, the present invention uses the subspace projection technology to suppress the clutter of the total echo data received by the airborne early warning radar, and projects the data of the unit to be detected into the orthogonal subspace of the clutter subspace to obtain ...
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The invention discloses a method for detecting a high maneuvering target and estimating parameters based on tertiary phase transformation and a virtual phase function. The method comprises the following steps: performing clutter suppression on total echo data received by an airborne early warning radar to obtain a clutter-suppressed signal; performing space phase correction on the clutter-suppressed signal to obtain a phase-corrected receiving signal matrix; selecting the phase-corrected signal of each array element at multiple moments to perform bilinear transformation to obtain a phase function matrix at multiple moments; respectively compensating space-time phase for a phase function of each array element at multiple moments to complete virtual phase function construction; constructing cost function to perform parametric search on virtual phase functions reconstructed at different moments to obtain instant frequency of the corresponding moment; and performing linear fitting on a cluster of obtained instant frequencies to obtain motion parameter estimated values. By reconstructing the virtual phase function, the method is equivalent to increasing coherent integration time, improving the parameter estimation precision and capable of obtaining precise estimated results under the condition that the pulse points are limited.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to an air maneuvering target detection method based on cubic phase transformation and virtual phase function. [0002] technical background [0003] Airborne phased array radar, also known as airborne early warning radar, uses aircraft as a carrier and has the characteristics of high maneuverability and strong survivability. Compared with ground-based radar, its visual range is farther, so it can serve as warning, command, etc. Important tasks, so the role in modern warfare is becoming more and more important. However, because the airborne phased array radar is in a downward-looking state, its clutter has the characteristics of wide distribution and high intensity, so it submerges the target signal to a large extent, which seriously affects the radar's detection and estimation of the target signal performance. The traditional space-time adaptive processing (Space-Ti...
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IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/36G01S7/415
Inventor 李海周盟吴仁彪
Owner CIVIL AVIATION UNIV OF CHINA