Multi-input multi-output radar waveform design and processing method

Abstract

The invention discloses a multi-input multi-output radar waveform design and processing method, specifically comprising the following steps: setting waveform parameters according to the resolution power of radar and the zero side lobe band request, and forming a multi-phase sequence matrix; forming the multi-phase encoding sequences of various transmission waveforms by using various lines orderlyconnected with each other in series in the multi-phase sequence matrix; using the multi-phase encoding sequences connected in series to respectively perform encoding modulation for the base pulse to generate the transmission signals of various transmission array elements of the transmission array; transmitting the generated transmission signals by various transmission array elements; receiving the echo signals of the transmission signals reflected by the target object through the receiving array elements of the receiving array; performing base band conversion and A / D conversion for the echo signals; regarding the transmission signal as the reference signal, and performing pulse compression processing for the echo sequence of various receiving array elements from the frequency domain; and using the scheduled range gate to intercept the pulse pressure output echo sequence according to the stated time interval to limit the interference of the side lobe. The application of the waveform processing method can fully eliminate the interference of the correlative side lobes with different transmission waves in the multi-input multi-output radar pulse compression output signal sequence in the range of the stated distance so that the precise separation for the target scattering information in different observation channels can be realized so as to improve the precision of the following radar signal and data processing.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a multiple-input multiple-output (MIMO, Multiple-Input Multiple-Output) radar waveform design and processing method. Background technique [0002] MIMO radar is a new concept radar system developed in the world in recent years. Due to its unique advantages in target detection, parameter estimation, high-resolution imaging, anti-stealth target, anti-destruction, anti-jamming, etc., the MIMO radar The new concept radar has attracted extensive attention of many scholars and engineers at home and abroad. Different from traditional radars, the MIMO radar transmit array and receive array usually contain multiple phase centers, and the echo of each receive channel is usually the vector sum of all transmit signals scattered by the target, which makes the matched filter output signal of each receive channel usually It not only contains the autocorrelation distance sidelobe interference of ...

AI Technical Summary

Problems solved by technology

Although Blunt et al. have proved the effectiveness of this method, since the estimation of the filter response by this method is based on the premise that the coded signal is completely orthogonal, for non-completely orthogonal coding, it will cause an error in the response estimation. As a result, with the increase of the number of transmitting array elements and the accumulation of estimation errors of different channels, the pulse compression output sidelobe level will increase significantly

Also, it should be pointed out that this method does not take into account the noise-induced mismatch penalty in pulse compression

Usually, as the signal-to-noise ratio decreases, the effect of the noise component gradually increases, and the filter response gain obtained by sequential inertial least squares (RMMSE) tends to zero, and the pulse compression will fail.

Images