Dynamic adjusting radar angular error method

Abstract

The invention discloses a dynamic adjusting radar angular error method, comprising steps of obtaining radar angular error standard difference corresponding to various reception signal-to-noise ratios, forming a relation curve of the radar angular error standard difference and the reception signal-to-noise ratio under various radar working condition, dividing the relation curve of the radar angular error standard difference and the reception signal-to-noise ratio into a plurality of segment, determining a gradient of each segment, determining the corresponding gradient according to the signal-to-noise ration received which is obtained in real time, regulating the parameter to obtain a dynamic adjustment coefficient by combining with the command system, and obtaining a radar angular error real time output value according to the real-time measurement value of the radar angular error and the dynamic adjustment parameter. The invention can reduce the antenna oscillation and thoroughly eliminate antenna violent oscillation by receiving the information dynamic adjustment of the signal-to-noise ratio of the reception signal to output to a radar angular error of the server system, avoids the condition that the object is missing because the close range radar glint and improves the tracking performance and system stability.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for dynamically adjusting radar angle errors. Background technique [0002] The radar angle error is the angle error information formed by the difference between the antenna pointing and the target line of sight direction extracted by processing the echo signal. The continuous tracking radar sends the extracted radar angle error to the closed-loop angle servo system to drive the antenna beam to move with the target movement, so as to achieve precise tracking of the target. [0003] Due to the existence of factors such as noise and angular flicker, the angular error extracted by the radar changes randomly, especially when the signal-to-noise ratio of the received signal is low, the radar angular error changes greatly, which often causes the servo system to control the antenna violently. Affect the tracking accuracy of the radar and the stability of the system. [0004] Th...

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Problems solved by technology

Such as non-patent literature, literature 1 "tracking radar angle error analysis and filter design" ("ship electronic countermeasures", No.4, 1995) and literature 2 "discussion on airborne radar angle error processing" ("Gansu Science and Technology" , Vol.30No.17, Sept.2014), Document 3 "Research on Control Accuracy of Radar Servo System" ("Harbin Institute of Technology Dissertation", 2009), in which Document 1 uses Kalman filter to process the extracted radar angle error , Document 2 uses alpha-beta filtering to process the extracted radar angle error, and Document 3 conducts a more in-depth study on the filtering of radar angle error. In addition to introducing the above two filtering methods, it also describes the PID filter in detail, and Compared and analyzed their advantages and disadvantages, the filter processing of radar angle error can improve the control performance of servo mechanism and radar angle measurement performance to a certain extent, but there is a large filter response time, and the receiving signal-to-noise ratio is low The filtering effect is limited when the radar angle error measurement error is large

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