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MIMO (multi-input multi-output) radar waveform synthesis method based on space-time joint optimization

A radar waveform and joint optimization technology, applied in the radar field, can solve the problems of high peak side lobe level, weak target detection, disadvantage, etc., achieve the effect of good time domain autocorrelation characteristics and reduce system complexity

Active Publication Date: 2013-04-03
XIDIAN UNIV
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Problems solved by technology

[0008] The above-mentioned existing waveform design methods only ensure the spatial power distribution of the transmitted waveform, but do not consider the autocorrelation characteristics of the spatially synthesized signal or the echo signal, which may cause the pulse-compressed signal to have a high peak sidelobe level, which is not ideal. Good for weak target detection

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  • MIMO (multi-input multi-output) radar waveform synthesis method based on space-time joint optimization
  • MIMO (multi-input multi-output) radar waveform synthesis method based on space-time joint optimization
  • MIMO (multi-input multi-output) radar waveform synthesis method based on space-time joint optimization

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Embodiment Construction

[0032] refer to figure 1 , the specific implementation steps of this embodiment are as follows:

[0033] Step 1, determine the correlation matrix of the transmitted waveform.

[0034] According to different waveform needs, determine the correlation matrix of the transmitted waveform in the following two ways:

[0035] The first one, for the orthogonal waveform design, the correlation matrix of the transmitted waveform is determined as R=I M , where I M Indicates an M-dimensional unit matrix, and M indicates the number of emitting array elements;

[0036] The second one is for the waveform design of a specific emission pattern, using the convex optimization toolkit cvx to solve the following emission pattern matching model to obtain the correlation matrix R of the emission waveform:

[0037] min α , R Σ n = 1 ...

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Abstract

The invention discloses an MIMO (multi-input multi-output) radar waveform synthesis method based on space-time joint optimization. The method mainly solves the problem that existing methods are poor in autocorrelation property of air domain composite signals under the condition of guarantee of space power distribution of transmitted waveforms. The method includes the steps: determining a correlation matrix of a transmitted waveform according to actual demands; generating an initial constant modulus waveform matrix; determining an interested observation azimuth angle, namely an azimuth angle needing improvement of the autocorrelation property; designing a constant modulus waveform phase matrix by means of sequential quadratic programming; and synthesizing a constant modulus waveform matrix according to the phase matrix. The air domain property of the transmitted waveforms and the time domain autocorrelation property of specific direction signals are considered during waveform design, the synthesized waveforms are in expected space power distribution and have fine time domain autocorrelation property in the interested direction, and the method can be used for waveform design of MIMO radar in stages of target detection and tracking.

Description

technical field [0001] The invention belongs to the technical field of radar and relates to the synthesis of radar waveforms, which can be used in the waveform design of MIMO radars in the target detection and tracking stages to meet the performance required by engineering. Background technique [0002] Multiple-input multiple-output MIMO radar is a new active detection technology, and has become a research hotspot in the field of radar technology. According to the layout of the antenna, MIMO radar can be divided into two types: distributed MIMO radar and centralized MIMO radar. Among them, the centralized MIMO radar is characterized by a small array element spacing and the ability to freely design the waveform of each antenna, that is, waveform diversity. Compared with phased array radar, the degree of freedom of centralized MIMO radar is improved, which makes MIMO radar have more advantages, such as better parameter discrimination ability and more flexible emission patter...

Claims

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Application Information

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IPC IPC(8): G01S7/42
Inventor 刘宏伟周生华王旭戴奉周纠博
Owner XIDIAN UNIV
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