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2D FFT based time-division MIMO radar phase error correction method

A phase error and radar technology, which is applied in the field of phase error correction of time-division MIMO radar based on two-dimensional FFT, can solve the problems that the phase error cannot be corrected at the same time, and the accuracy is affected

Inactive Publication Date: 2018-08-10
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

However, this method has certain defects: 1) It is necessary to estimate the target speed, and the accuracy of speed measurement directly affects the accuracy of DOA estimation; 2) It can only be corrected for a single moving target. target, phase error cannot be corrected at the same time

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  • 2D FFT based time-division MIMO radar phase error correction method
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  • 2D FFT based time-division MIMO radar phase error correction method

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Embodiment

[0027] According to the time-division MIMO radar system model, two transmit and ten receive antennas are used, and the transmit array and receive array of the MIMO radar antenna are located on a straight line on the x-axis. A sparse uniform linear array antenna is used for transmission, and a dense uniform linear array antenna is used for reception. The transmit array The interval dt between two array elements is 5*λ, and the interval dr between each array element of the receiving array 10 is λ / 2, where λ is the wavelength, and dt is 10 times of dr. TDM signal adopts triangular LFMCW, carrier frequency f 0 =77GHz, signal repetition period T r = 20ms, using time-sharing transmission technology, the time interval for the transmission antenna to transmit signals is T r / 2, set the sampling frequency f s =50kHz, frequency modulation bandwidth B=100MHz, then the number of sampling points in one cycle is 1000. Utilizing this geometric arrangement of transmitting array elements an...

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Abstract

The invention discloses a 2D FFT based time-division MIMO radar phase error correction method. The method comprises the following steps that an echo signal model is established; 2D FFT is carried outon echo signals to obtain a 2D matrix corresponding to distance and velocity units of an object, and each velocity unit is corrected according to a correction coefficient, and DOA estimation is carried out on corrected 2D FFT results, and a corrected angle measurement result is obtained. A phase error can be corrected effectively, the velocity of the moving object needs not to be pre-estimated, and multiple objects can be processed.

Description

technical field [0001] The invention relates to radar phase error correction technology, in particular to a two-dimensional FFT-based time division MIMO radar phase error correction method. Background technique [0002] Multiple-input multiple-output (MIMO) radar is a new radar system proposed in recent years. MIMO radar has M transmitters and N receivers, it can send M orthogonal transmission waveforms and receive N echo signals at the same time, using waveform diversity technology to generate doubled virtual array elements, which is equivalent to increasing the receiver The aperture of the array can be used to improve the parameter estimation performance of the system target. Therefore, compared with traditional radar, MIMO radar can obtain higher angular resolution and higher spatial resolution. However, this MIMO radar system also requires a large number of transmitters and receivers, the equipment is complex, and the actual application cost is relatively high. Some s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/4004G01S7/4052
Inventor 缪晨赵阳莹吴文何仲阳张培钟
Owner NANJING UNIV OF SCI & TECH