Automatic estimation method for antenna pattern relative to high-frequency ground wave radar

Abstract

The invention provides an automatic estimation method for an antenna pattern relative to high-frequency ground wave radar. The method comprises the following steps of: selecting single arrival angle echo spectral points with higher signal-to-noise ratios than a predetermined signal-to-noise ratio from radar echo signals; modifying a current antenna pattern by utilizing the amplitude ratios and the arrival angles of various selected signal arrival angle echo signal spectral points to obtain a modified antenna pattern; judging whether the modified antenna pattern is converged relative to the current antenna pattern; if the modified antenna pattern is converged relative to the current antenna pattern, taking the modified antenna pattern as the obtained antenna pattern; and if the modified antenna pattern is not converged relative to the current antenna pattern, repeating the modifying step by taking the modified antenna pattern as the current antenna pattern. By the method provided by the invention, each antenna pattern is estimated from the radar echo signals in a soft computing mode completely; the conventional measurement mode which adopts an additional transponder or beacon equipment is abandoned; and the complexity and the operating cost of a high-frequency ground wave radar system are reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of high-frequency radar, and in particular relates to a method for automatically estimating the relative antenna pattern of high-frequency ground wave radar by using recursive calculation without any external cooperative calibration source. Background technique [0002] Due to its unique over-the-horizon and all-weather detection capabilities, high-frequency ground wave radar has been widely studied and successfully applied to the measurement of ocean surface dynamic parameters (such as currents, winds, waves), and can detect ships and aircraft in real time sports goals. The existing receiving antenna arrays of high-frequency ground wave radars can be divided into two types, one is a phase control array, such as a uniform linear array composed of whip antennas; the other is a compact amplitude control array, such as a monopole / crossover array Ring three-element antenna array. The latter has better flexibil...

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Problems solved by technology

The above two methods can effectively measure the actual antenna pattern, and can be carried out online before or during the official radar observation. However, the actual measurement method increases the complexity and cost of the system equipment, and the measurement is limited by time, Restricted by factors such as weather and terrain, it cannot automatically track changes in the environment in time (such as new buildings near the antenna, newly grown trees, etc.)

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