Air-to-ground slope distance measuring method applicable to phased array radar

Abstract

The invention discloses an air-to-ground slope distance measuring method applicable to phased array radar. The method includes: according to the angle, given by a system, of to-be-measured points, controlling an antenna beam to pitch a certain small-angle area at the to-be-measured point and in the direction of the to-be-measured point to select multiple angle control points, and performing AGR (air-to-ground ranging) on each measuring point to obtain a slope distance value, wherein the interval between every two control points is larger than one beam granularity; hypothesizing that the groundof a small region is flat due to the fact angle detection is small according to the angle differences of the control points and the to-be-measured points, and using carrier height, antenna pointing information and space geometry relation to calculate the slope distance of the to-be-measured points according to the slope distance and angle differences of the control points; averaging slope distance data, obtained by approaching the different control points, of the to-be-measured points to obtain the slope distance values of the target to-be-measured points; using three different working frequency to average the measuring results. By the method, error randomization of multiple measuring is achieved, and slope distance measuring errors can be reduced.

Description

technical field [0001] The invention relates to the technical field of radar slant distance measurement, in particular to an air-to-ground slant distance measurement method suitable for phased array radar. Background technique [0002] Air-to-ground ranging (AGR) is an important working mode of airborne multifunctional fire control radar. It is used by fighter jets to carry out precise strikes on ground targets. It can also assist in positioning the aircraft by measuring the distance from known ground points to achieve auxiliary navigation functions. . This method controls the antenna to align with the angle provided by the aircraft system to perform ranging. Because the beam of phased array radar is controlled by the phase shifter, there is spatial discontinuity. This characteristic causes the beam to not necessarily be able to accurately point to the angle given by the system, and there is a deviation similar to the system error for a certain specified point. The angle d...

AI Technical Summary

Problems solved by technology

It can be seen that the beam pointing given by the software with 16-bit accuracy is truncated to 8 bits during the operation of the wave control adder, and is truncated to 6 bits during the phase shifter nonlinear calibration and phase shifter driving links, and the beam control pointing accuracy is greatly decline

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