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OFDM-based coherent MIMO radar orthogonal waveform design method

A technology of orthogonal waveforms and design methods, applied in multi-carrier systems, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve many problems such as mathematical derivation, orthogonality destruction, and complex implementation

Inactive Publication Date: 2015-08-12
DALIAN UNIV OF TECH
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Problems solved by technology

However, the above methods still have the following deficiencies: 1. The algorithm for generating signals is relatively complicated. Whether it is based on fuzzy functions or constraints, more mathematical derivations are required, and the workload is large. 2. The orthogonality of the generated signals can only be satisfied under certain conditions, and can only be called quasi-orthogonal signals; when the conditions are not met, the orthogonality is easily destroyed, resulting in Overall Radar Performance Declines

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  • OFDM-based coherent MIMO radar orthogonal waveform design method
  • OFDM-based coherent MIMO radar orthogonal waveform design method
  • OFDM-based coherent MIMO radar orthogonal waveform design method

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with accompanying drawing.

[0040] Such as figure 1 As shown, a coherent MIMO radar quadrature waveform design method based on OFDM includes the following steps:

[0041] Step 1, establishment of OFDM signal mathematical model: common OFDM signal can be expressed as,

[0042] s ( t ) = Σ n = 1 N d [ n ] · exp [ j 2 π · nΔf · t ] - - - ( 1 )

[0043] In formula (1), d[n] represents the modulated sequence of the baseband digital sequence. Since the OFDM signal is not used as a communication signal, the baseband ...

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Abstract

The invention relates to a radar orthogonal waveform design method, and especially relates to an OFDM-based coherent MIMO radar orthogonal waveform design method. The OFDM-based coherent MIMO radar orthogonal waveform design method comprises the steps of establishing the OFDM signal mathematical module; generating random base band sequence; conducting polarity transformation on the random base band sequence; conducting QPSK modulation on the transformed random base band sequence; building random drawing function; arranging Ci from small to large by means of bubbling method; conducting zero filling on each sequence; conducting IFFT by means of new modulation sequence generated by the step 2-7. With the OFDM signal in the original communication being as the base and through constructing the random function, random drawing of the sub-carrier of the OFDM signal can be conducted, and thereby a plurality of groups of modulation code sequences can be obtained, and the final SI-OFDM signal can be obtained by means of rapid inverse Fourier transform in discrete time. The OFDM-based coherent MIMO radar orthogonal waveform design method is advantageous in that the method is simple and clear; with the IFFT, signal generation is easy, and engineering practice is more practical.

Description

technical field [0001] The present invention relates to a radar quadrature waveform design method, more specifically, relates to a coherent MIMO radar quadrature waveform design method based on OFDM. Background technique [0002] With the development of radar technology and the improvement of its functional requirements, the performance bottleneck of traditional SISO (Single-Input Single-Output) radar has gradually become prominent. Compared with it, the MIMO radar of the new system has better range and Doppler resolution, improves the system degree of freedom, and can counteract the scintillation of the cross-sectional area of ​​the target. The performance of MIMO radar has a very close relationship with its transmitted waveform. Coherent MIMO radar requires that the transmit waveforms be orthogonal to each other, so as to obtain wide-beam low-gain waveforms. At the receiving end, the echo signals can be completely separated without mutual interference. Therefore, the de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/34
CPCG01S13/347
Inventor 王宗博林智斌
Owner DALIAN UNIV OF TECH
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