Robust cognitive radar transmitting-and-receiving combined designing method in clutter environment

A cognitive radar, transmission and reception technology, applied in the field of signal processing, can solve the problems of reducing the utilization rate of transmission power, long operation time, high computational complexity, etc., and achieve the effect of enhancing adaptability and improving detection performance

Active Publication Date: 2017-08-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

This problem considers energy constraints, so that the optimal signal amplitude changes in a large dynamic range, but in practical applications, nonlinear amplifiers often limit the range of its amplitude and reduce the transmit power utilization
In addition, this method uses the cvx toolbox to solve the SDP problem and the randomization method has high computational complexity, long operation time, and the randomness of the optimization results is large, which greatly limits its practical application scenarios

Method used

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  • Robust cognitive radar transmitting-and-receiving combined designing method in clutter environment
  • Robust cognitive radar transmitting-and-receiving combined designing method in clutter environment
  • Robust cognitive radar transmitting-and-receiving combined designing method in clutter environment

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Embodiment Construction

[0040] combined with figure 1 , the specific implementation steps of the present invention are described as follows:

[0041] 1. Establishment of a single base cognitive radar system model

[0042] (1) Slow time observation vector description

[0043] Considering that the monostatic radar continuously transmits N pulses, and each pulse is matched and filtered within its corresponding pulse repetition interval (PRI) and then sampled, the observation vector under the current range loop is described as follows:

[0044] v=α T s⊙p(f T )+c+n

[0045] s=[s(1),s(2),...,s(N)] T is a codeword sequence of N pulses, α T is a complex parameter related to the target, Indicates the target power, f T is the normalized Doppler frequency of the target, is the frequency-steering vector, c and n are the clutter interference item and the noise item respectively, where n is Gaussian white noise, and its covariance matrix is in Indicates the noise power, I N Represents an N×N identi...

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Abstract

The invention discloses a robust cognitive radar transmitting-and-receiving combined designing method in a clutter environment, wherein the method belongs to the field of signal processing. The invention relates to the robust cognitive radar transmitting-and-receiving combined designing method in the clutter environment. Each iteration step in the method of the invention relates to a MVDR settlement problem and a plurality of one-directional fractional programming problems which can be efficiently settled by means of a Dinkelbach process. Simulation proves a fact that the algorithm can effectively improve an outputted SINR in short time, and realizes efficiency breakthrough and effect breakthrough relative to an SDR algorithm, thereby improving system testing performance.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a robust cognitive radar transmit-receive joint design method in a clutter environment. Background technique [0002] With the development of electronic technology and radar signal processing technology, advanced radar systems can use prior knowledge-based signal processing technology to adaptively change their own characteristics through prior knowledge to obtain better performance. In this context, Canadian scholar Simon Haykin formally proposed the concept of cognitive radar in 2006, and cognitive radar (CongniveRadar, CR) came into being. As an emerging intelligent radar, the cognitive radar system adopts a closed-loop structure, and designs the adaptive waveform of the radar by analyzing and utilizing the target and environmental information, so as to improve the recognition and detection performance of the target. First, the system uses the idle time slot of the transmitting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/40G01S7/36
CPCG01S7/023G01S7/36G01S7/4052G01S7/414
Inventor 崔国龙付月熊丁丁余显祥孔令讲易伟张天贤杨晓波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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