Single-pulse angle measurement method for machine-scanned meter-wave radar based on iterative processing

Abstract

The invention belongs to the technical field of radars, and discloses a mechanic scan meter-wave radar monopulse angle measuring method based on iterative processing. The method can reduce the influence of noise on signals and reduce the angle measuring error. The method comprises the steps of: uniformly dividing an antenna into two sub-arrays to transmit pulse signals; performing coherent accumulation on the received echo signals to obtain accumulated data; performing phase adjustment on the received echo signals, selecting a maximum amplitude, and finding the angle value theta max of the corresponding pulse; separately selecting (L-1) / 2 angle values theta 1 on the left and the right of the angle theta max, and finding corresponding amplitudes, thus obtaining two groups of new data; obtaining a sum beam and a difference beam from the two groups of data; performing sum-difference beam monopulse angle measurement on the sum beam and the difference beam to obtain a target off-axis angle; endowing the off-axis angle to the theta max; and repeating the above steps till the target estimated angle satisfies a preset error condition.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a method for measuring the angle of a single pulse of a machine-scanning meter-wave radar based on iterative processing, which can be used to measure the angle of a target with the single-pulse method when the normal line of the antenna center in the mechanical scanning radar is not aligned with the target. Background technique [0002] Due to the small signal attenuation and long detection distance, meter wave radar has unique advantages in over-the-horizon detection and anti-electronic interference. However, due to the long wavelength and wide beam of meter wave radar, its angular resolution is poor. Angle measurement accuracy is low. Mechanical scanning radar has been widely used due to factors such as low cost and simple implementation. The angle measurement method of machine-scanned radar generally adopts the maximum signal method, but the accuracy of this method is poor, es...

AI Technical Summary

Problems solved by technology

However, affected by the shortcomings of the wide beam of the aircraft-scanning meter-wave radar and the inaccuracy of the central beam on the target, the accuracy of the amplitude-phase and difference beam single-pulse angle measurement method is higher than that of the maximum signal method, but its angle measurement accuracy is greatly affected by noise. The accuracy needs to be further improved, especially when the antenna center normal is not aligned with the target, the angle measurement accuracy is still very low, which affects the resolution of the radar and the accuracy of detecting and tracking the target

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