Ground phase-correcting method for double-channel tracking system

Abstract

The invention provides a ground phase-correcting method for a double-channel tracking system and aims to provide a method which is independent from any external condition and has a phase-correcting precision equivalent to that of a standard tower-correcting method. According to the technical scheme, the ground phase-correcting method comprises the following steps: firstly, placing a beacon on the ground in a position with a more than 0.3R radial distance from a ground station antenna, adjusting a beacon signal level and finishing level calibration at an input end of a ground station tracking receiver; causing the ground station antenna to direct to the beacon direction and correcting the phase; causing the ground station antenna to deviate from the beacon for 4 milli-inches along azimuth and pitching directions; respectively adjusting phase shift values of an azimuth phase shifter and a pitching phase shifter of the tracking receiver; storing the phase shift values when azimuth error voltage and pitching error voltage are maximal; controlling the ground station antenna to deviate from beacon null point along the azimuth and pitching directions; checking error voltage polarity and cross-coupling; automatically tracking the beacon; checking a convergence condition of a servo loop; and counting and recording angle-measuring random errors.

Description

technical field [0001] The invention belongs to the technical fields of aircraft measurement and control, satellite communication and radar, and relates to a method for correcting sum difference phase inconsistency in a dual-channel monopulse system angle tracking system. Background technique [0002] Since the sum-difference dual-channel single-pulse technology was proposed in the 1950s, it has been used in precision tracking and measurement radars because of its advantages such as high tracking accuracy, simple equipment, high reliability, excellent angular error demodulation performance, and easy implementation. Widely used, but the technical problem of the inherent phase inconsistency of the dual-channel single-pulse system has not been solved for a long time. In the actual engineering development process, the feed network cannot achieve the same ideal results as the theoretical values ​​in terms of circular polarization synthesis, azimuth / elevation signal orthogonality,...

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the application limitations of the above phase correction method and solve the urgent needs of the current construction of new ground stations, the present invention proposes a technical solution that is feasible, convenient to implement, does not depend on any external conditions, and has a phase correction accuracy comparable to that of the calibration tower method. A new phasing scheme to solve the problem of inconsistency of the sum and difference phases of the dual-channel single-pulse system angle tracking system; it has been verified by field tests and can fully meet the actual needs of engineering applications

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