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Frequency domain-based Doppler compensation method for I-OFDM MIMO radar signal

A technology of I-OFDMMIMO and Doppler compensation, applied in the field of Doppler compensation, can solve the problems of impractical engineering, cumbersome process, and large amount of calculation

Inactive Publication Date: 2015-08-19
DALIAN UNIV OF TECH
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Problems solved by technology

Still there are following deficiencies in the following aspects in the existing method: 1, although the echo signal can be compensated by the MTD method, multiple compensation processes and multiple FFT (fast Fourier transform) of several branches need to be done, IFFT (Inverse Fast Fourier Transform)
The process is relatively cumbersome, the amount of calculation is relatively large, and it is not practical in engineering; 2. The compensation for OFDM signals is limited to signals used in communication. Due to the large difference in operating frequency, this compensation method is not suitable for OFDM radar signals; 3. The research on Doppler compensation method for I-OFDM quadrature MIMO radar signal needs to be further explored

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  • Frequency domain-based Doppler compensation method for I-OFDM MIMO radar signal
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  • Frequency domain-based Doppler compensation method for I-OFDM MIMO radar signal

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Embodiment Construction

[0058] The present invention will be further described below in conjunction with accompanying drawing.

[0059] Such as figure 2 Shown, the Doppler compensation method based on frequency domain I-OFDM MIMO radar signal comprises the following steps:

[0060] Step 1. Assume that the MIMO radar transmitting and receiving antenna arrays each have 4 antennas, that is, M=N=4; the distance between adjacent elements of the two arrays is 4 meters, that is, d T = d R =4m; Suppose the distance between the moving target and the antenna array is 3 kilometers, R=3km. The radial velocity of the target is v T =62.5m / s, the working frequency of I-OFDM radar signal is f 0 = 24GHz. In theory, the corresponding Doppler frequency shift is f v =10KHz=0.25·(4Δf), taking the first receiving antenna as an example, the received signal is:

[0061] r 1 ( t ) = δ Σ ...

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Abstract

The invention relates to the field of signal processing, and provides a frequency domain-based Doppler compensation method for I-OFDM MIMO radar signals. The method includes the steps of firstly, establishing an MIMO radar mathematics model; secondly, sampling continuous waves obtained by a receiving end; thirdly, solving DFT of an echo signal obtained from the previous step; fourthly, calculating a Doppler compensation matrix; fifthly, estimating a Doppler frequency value; sixthly, calculating the compensation matrix through the obtained frequency estimation value; and seventhly, multiplying the signal frequency spectrum obtained from the step 3 by the compensation matrix, and performing IDFT. The Doppler frequency value of the echo signal is estimated, so FFT and IFFT calculation through multiple branches for many times in a conventional method is avoided, and the calculation workload is reduced. Moreover, through combination of the characteristics of DFT and IDFT transformation of reception signal, the compensation matrix is derived creatively in a matrix form, so calculation of the compensation matrix is simplified, and the speed of Doppler compensation is increased.

Description

technical field [0001] The invention relates to a frequency domain-based Doppler compensation method for I-OFDM MIMO radar signals, belonging to the technical field of radar signal processing. Background technique [0002] With the maturity of MIMO (Multi-Input Multi-Output) technology in communication, it has been applied to radar, making MIMO radar the most popular concept at present. Coherent MIMO radar requires the working signals to be orthogonal to each other, so that the receiving end can separate the received waves from different antennas in the echo signal. I-OFDM (Interleaved-Orthogonal Frequency Division Multiplexing) is a group of radar signals that are orthogonal to each other, but the moving target makes the echo produce Doppler frequency shift, which causes the performance of pulse compression processing to decline, and even the time delay of the signal cannot be extracted. information. Therefore, Doppler compensation for the echo signal has become a researc...

Claims

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Application Information

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IPC IPC(8): G01S13/50G01S7/292
CPCG01S13/50G01S7/292
Inventor 林智斌王宗博
Owner DALIAN UNIV OF TECH
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