Shipborne high-frequency ground wave radar motion compensation method based on double reference radio frequency signals

Abstract

The invention provides a ship-borne high-frequency ground wave radar motion compensation method based on double reference radio frequency signals. Two sets of reference radio frequency signal emission sources are arranged on a shore base; a ground wave radar system is arranged on a ship platform and comprises a plurality of receiving antennas which are symmetrically arranged on one side of a ship board along the central axis of a ship, and the first receiving antenna is arranged on a ship bow; the sea level is divided into a plurality of sea surface blocks, and attitude parameters of the platform are calculated through double-reference radio frequency signals distributed on the shore; and motion compensation of radar echo signals modulated by platform motion is realized.

Description

technical field [0001] The invention relates to the technical fields of radio physics and marine science, in particular to a motion compensation method for a ship-borne high-frequency ground wave radar based on a double-reference radio frequency signal. Background technique [0002] High-frequency over-the-horizon radar utilizes the characteristics of high-frequency (3-30MHz) electromagnetic waves with small diffraction and propagation attenuation on the conductive ocean surface, and uses vertically polarized antennas to radiate radio waves, which can over-the-horizon detect ships, aircraft and missiles that appear below the line of sight at sea level and other sports goals. At the same time, high-frequency over-the-horizon radar uses the first-order scattering and second-order scattering mechanisms of high-frequency electromagnetic waves on the ocean surface, and can extract sea state information such as wind field, wave field, and flow field from radar echoes. According t...

AI Technical Summary

Problems solved by technology

However, the following problems are unavoidable: (1) There are problems such as random errors and time delays in the sensor accuracy, and the time delay will seriously affect the effect of the motion compensation algorithm, and it is difficult to eliminate the motion-induced peaks generated by the six-degree-of-freedom motion modulation; (2) Sensors such as inertial navigation can measure the attitude of high-precision shaking (that is, roll, pitch and heading change), but it is difficult to directly measure the attitude of swing (that is, sway, surge and heave), and the measurement accuracy is limited

However, the motion-induced peaks produced by different degrees of freedom have similar characteristics on the frequency spectrum, and it is often difficult to determine which degree of freedom the motion-induced peak is caused by

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