Phase comparison monopulse sum-difference phase correction method based on measured data

Abstract

The invention relates to a phase comparison monopulse sum-difference phase correction method based on measured data, and belongs to the field of radar parameter estimation. Comprising the following steps: (1) carrying out frequency mixing and equally-spaced sampling on echo signals received by a receiving array, and then carrying out digital down-conversion; and finally carrying out matched filtering to obtain array element level target echo data of the left and right sub-arrays. (2) respectively carrying out digital beam forming on the left and right sub-arrays; (3) obtaining sum path and difference path data after matched filtering; and (4) assuming that the target is located between two adjacent beams, and obtaining an angle estimation value of a left beam target and an angle estimation value of a right beam target according to a formula. And (5) solving to obtain a phase relation according to the fact that the angle estimation values of the left and right beam targets are equal, namely, the final sum-difference channel phase difference needing to be compensated. On the basis of measured data of the phased array radar, online phase correction is carried out on the sum channel and the difference channel, external injection of test signals is not needed, and high efficiency and rapidness are achieved.

Description

technical field [0001] The invention belongs to the field of radar parameter estimation, in particular to a phase correction method for a phased array radar and difference angle measurement. The invention is used for angle estimation in phased array radar. Background technique [0002] Monopulse radar is a new technology that emerged in the late 1940s. Since it was proposed, it has gradually played an increasingly important and irreplaceable role in aviation and missile defense systems. Its high-precision indicators meet many high-level requirements. An urgent and demanding requirement for precision tracking radar. Theoretically, monopulse angle measurement only needs to process one echo pulse to determine the target angle information. In engineering, due to the small amount of calculation and high angle measurement accuracy, it is a commonly used phased array radar angle estimation algorithm. [0003] Schematic diagram of phased array radar phase-compared monopulse angle ...

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