Check patentability & draft patents in minutes with Patsnap Eureka AI!

A Fast Moving Target Detection Method for Airborne Frequency Diversity Array Radar Based on Main Lobe Amplitude Response Control

A frequency diversity array, fast motion technology, used in measurement devices, ICT adaptation, radio wave measurement systems, etc., can solve the mismatch, it is difficult to accurately and effectively determine the number of main eigenvectors of a positive definite matrix, and fast motion cannot be guaranteed. Target detection performance and other issues to achieve the effect of improving detection performance

Active Publication Date: 2022-07-05
NAT UNIV OF DEFENSE TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an airborne frequency diversity array radar fast moving target detection method based on the main lobe amplitude response control, which is based on the amplitude response constraint technology, and the main lobe space-time response constraint is designed in the space-time domain of interest to the target To solve the problem of serious mismatch of target space-time guidance vector; in the fast-moving target angle-Doppler defocus region, the unfocused space-time response constraints are designed, and a robust FDA- For the STAP optimization problem, a robust FDA-STAP weight vector is obtained, and a more accurate main lobe pointing is obtained, thereby improving the detection performance of the airborne frequency diversity array radar for fast moving targets, and solving the problem of using only one relatively large feasible The area may not guarantee the detection performance of fast moving targets, and it is difficult for this method to accurately and effectively determine the number of main eigenvectors in the positive definite matrix when designing non-focused steering vector constraints

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Fast Moving Target Detection Method for Airborne Frequency Diversity Array Radar Based on Main Lobe Amplitude Response Control
  • A Fast Moving Target Detection Method for Airborne Frequency Diversity Array Radar Based on Main Lobe Amplitude Response Control
  • A Fast Moving Target Detection Method for Airborne Frequency Diversity Array Radar Based on Main Lobe Amplitude Response Control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] see figure 1 , an embodiment provided by the present invention: an airborne frequency diversity array radar fast moving target detection method based on main lobe amplitude response control, airborne frequency diversity array radar target and clutter data collection:

[0078] The echo data of target, clutter and noise is received through the frequency diversity antenna array on the airborne platform; the number of array elements of the side-looking airborne frequency diversity array radar is N, the number of transmitted pulses is K, and the array element interval is d, the pulse repetition frequency is f PRF , the platform flight direction is v p ; For the echo signal received by the target, after down-conversion and matched filtering, beamforming at the receiving end is performed, and the received space-time snapshot data of the slow moving target can be obtained;

[0079]

[0080] Among them, αt represents the complex amplitude of the target, a(f a (ψ t ),f r ...

Embodiment 2

[0087] An embodiment provided by the present invention: a method for detecting a fast moving target of an airborne frequency diversity array radar based on the main lobe amplitude response control, and analysis of the angle Doppler defocusing of the fast moving target:

[0088] Equation 1 gives the received echo signal of a slow moving target, where the value of the extra part related to the frequency increment is very small and can be ignored, but for the fast moving target observed by the airborne frequency diversity array radar, the same as The value of the part related to the frequency increment is relatively large. Considering that the carrier frequencies of different array elements are different, then the angular frequency and the normalized Doppler frequency of the target are respectively expressed as

[0089]

[0090]

[0091] where λ n represents the carrier frequency of the nth transmitting array element, in this case, the target signal received by the nth arra...

Embodiment 3

[0100] see figure 2 , an embodiment provided by the present invention: an airborne frequency diversity array radar fast moving target detection method based on main lobe amplitude response control, and a robust FDA-STAP method based on main lobe amplitude response constraints:

[0101] The space-time response function can be regarded as an extension of the array response from one dimension to two dimensions. The space-time response function is used to constrain the STAP weight vector; for FDA-STAP radar, the space-time response function G(f S ,f D ) is expressed in the following form

[0102] G(f S ,f D )=w H s(f S ,f D ) 10

[0103] in, represents the space-time steering vector corresponding to a point on the angle-Doppler plane, where f S and f D are the corresponding normalized spatial frequency and Doppler frequency, where the angular frequency after distance correlation compensation is the normalized spatial frequency; in order to resist the uncertainty of the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an airborne frequency diversity array radar fast moving target detection method based on main lobe amplitude response control, airborne frequency diversity array radar target and clutter data acquisition; fast moving target angle Doppler defocus analysis; Robust FDA Space-Time Adaptive Processing Method for Main Lobe Amplitude Response Constraints; Clutter Suppression and Fast Moving Object Detection. Based on the amplitude response constraint technology, the invention designs the main lobe space-time response constraint in the space-time domain of interest to the target to solve the problem of serious mismatch of the target space-time steering vector; in the fast moving target angle-Doppler defocus region The non-focused space-time response constraints are designed, and a robust FDA-STAP optimization problem including the non-ideal factors of the clutter covariance matrix is ​​established. Detection performance of airborne frequency diversity array radar for fast moving targets.

Description

technical field [0001] The invention relates to the technical field of moving target detection, in particular to an airborne frequency diversity array radar fast moving target detection method based on main lobe amplitude response control. Background technique [0002] In recent years, the frequency diversity array radar can flexibly control its beam scanning by adding a relatively small frequency increment between the array elements. While the pattern of conventional phased array radars is not range dependent, frequency diversity array radars can produce range dependent transmit directions. This range-angle-dependent pattern of frequency-resolved array radars can focus the transmitted energy into a desired range-angle space. Scholars obtain point-like distance-angle patterns by designing frequency increments, such as: nonlinear incremental frequency increments, time-modulated frequency increments, multi-carrier frequency increments, random frequency increments, and Coprime...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/50G01S13/58
CPCG01S13/50G01S13/58Y02A90/10
Inventor 李志汇师俊朋周青松毛云祥潘继飞
Owner NAT UNIV OF DEFENSE TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com