A method for simultaneously receiving sky-wave and ground-wave over-the-horizon radar signals

Abstract

The invention discloses a method for simultaneously receiving sky wave and ground wave BVR radar signals. A distance offset method is used for transmitted signals on a sky wave transmitting station and a ground wave transmitting station so that a ground wave radar station on a shore base can simultaneously receive echo signals obtained by signals transmitted by a sky wave radar and a ground wave radar and scattered by a sea surface or a ship or a low altitude flight object. The method is simple and convenient to achieve, distance offset only needs to be conducted on sky wave transmitting signals and ground wave transmitting signals, it is guaranteed that the ocean of the sky wave radar and the ground wave radar or an object echo wave spectrum is within the bandwidth of a receiver filter, and aliasing of the distances and spectrum can not happen. An existing ground wave radar receiving system is used so that the purpose that the two BVR methods of sky wave transmitting and ground wave transmitting can be simultaneously used for detecting the ocean or target can be achieved. The combined detection mode can improve the detection accuracy of ocean surface dynamic parameters such as wind, waves and currents, the detection distance of a high-frequency BVR radar system is increased, and close distance fine detection and long distance ocean surface dynamic element detection are achieved.

Description

technical field [0001] The invention relates to a method for simultaneously receiving sky-wave and ground-wave over-the-horizon radar signals, and belongs to the technical fields of radio physics, over-the-horizon radar, and the like. Background technique [0002] Ground-wave over-the-horizon radar uses the characteristics of high-frequency (3-30MHz) vertically polarized electromagnetic waves with small attenuation and long propagation distance along the sea surface to detect targets such as sea surface, ships and aircraft outside the line of sight. It can reach 400km. High-frequency sky-wave over-the-horizon radar uses the reflection of high-frequency radio waves by the ionosphere to achieve long-distance detection, and the detection distance is more than 3000km. The over-the-horizon high-frequency radar based on the hybrid system of sky-wave emission and ground-wave reception overcomes the shortcomings of sky-wave and ground-wave over-the-horizon radars, and uses the adva...

AI Technical Summary

Problems solved by technology

The existing space-ground wave integrated detection technology focuses on sky-wave emission and ground-wave reception technology to obtain long-distance ocean or target information. The detection mode is single, and the detection accuracy of ocean surface dynamic parameters is limited.

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