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Waveform agility cognition radar system and implementation method

A cognitive radar and waveform technology, applied in the field of waveform agility cognitive radar system, can solve the problems of short target disappearance distance and poor adaptability of radar system, so as to improve detection performance, disappearance distance and adaptability

Inactive Publication Date: 2013-01-09
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention solves the technical problems of short disappearing distance of the target and poor adaptability of the radar system in the complex and changeable

Method used

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  • Waveform agility cognition radar system and implementation method
  • Waveform agility cognition radar system and implementation method
  • Waveform agility cognition radar system and implementation method

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Embodiment 1

[0038] The invention uses the radar system to transmit different waveforms to estimate and detect separately under the condition that the extended target and the clutter scattering characteristics are fluctuating and unknown in a complex environment, and realizes the "target and clutter estimation-emission waveform design-target detection" —Target and clutter estimation" cognitive radar closed-loop feedback structure, its functional block diagram is as follows figure 1 As shown, the cognitive radar system is a closed-loop dynamic feedback system.

[0039] The waveform agile cognitive radar system specifically includes: a sending unit, a receiving unit, a target and clutter estimation unit, and a target detection unit. figure 2 It is the overall structure diagram of the waveform agile cognitive radar system. As shown in the figure, the transmitting unit and the transmitting waveform design unit are located at the transmitter end, and the receiving unit, target and clutter estimati...

Embodiment 2

[0046] Based on the above-mentioned transmission agile cognitive radar system between different pulse groups, its specific implementation steps are as follows:

[0047] a: First, in the current pulse group k when the radar system starts to work, transmit a fixed chirp LFM signal U k , When the target exists, according to image 3 The simplified model diagram of the radar system shown, receiving echo signal Y k Echo signal SX from the target t , Clutter echo signal SX c And noise N, where S represents the column vector U k Convolution matrix composed of the transmitted signal, X t And X c Denote the expanded target impulse response column vector and the clutter channel column vector respectively.

[0048] b: When the k-th pulse group is over, collect the echo signals of M sub-pulses at the receiver, and use offline estimation of noise and interference power levels to obtain the impulse response column vector and clutter spatial agreement for the extended target The optimal online est...

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Abstract

The invention provides a waveform agility cognition radar system and an implementation method. On the condition that an object and clutter scattering characteristic exist fluctuation changes and are unknown, the implementation method comprises the following steps of: emitting range-invariable wave by an emitting end; realizing on-line estimation of the extended object and the clutter scattering characteristic by utilizing optimal treatment of received echo; optimizing and designing emitted waveform to aim at improving the detection performance of the extended object; and realizing emission agility between different pulse groups. By the system and the method, the disappearance distance of the object is effectively increased, and the adaptability of the radar system in a complicated and changeable environment is improved.

Description

Technical field [0001] The invention relates to the technical field of radar systems and radar signal processing, in particular to a waveform agile cognitive radar system and an implementation method. Background technique [0002] Traditional radars usually use fixed transmit signals, and improve performance through adaptive processing at the receiving end and the design of filtering algorithms. Because the radar's measurement, resolution performance, and target detection in clutter largely depend on the transmitted waveform, In the increasingly complex environment, dense clutter, and multiple target backgrounds, the transmitted waveform is fixed. When the environment changes, it is difficult to achieve the desired effect by adapting close to the receiving end. [0003] Cognitive radar is a closed-loop working method. Through the feedback from the radar receiving end to the transmitting end, the radar system can continuously learn and update the understanding of the target and the ...

Claims

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Application Information

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IPC IPC(8): G01S7/41
Inventor 孟华东公绪华刘一民王希勤
Owner TSINGHUA UNIV
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