Antenna arrangement method for improving MIMO-OTH radar detecting performance in ionized layer double-Gaussian model

Abstract

The invention discloses an antenna arrangement method for improving the MIMO-OTH radar detecting performance in an ionized layer double-Gaussian model. The antenna arrangement method includes the following steps that a detection signal is used for receiving two times of ionized layer reflection before the detection signal reaches the receiving end, the reflection coefficient of each time conforms to complex Gaussian random distribution, an ionized layer double-Gaussian reflection model is established, and the number of multiple paths is obtained based on the calculation of the distance between an antenna and a target according to the MQP model. By analyzing an echo signal of an MIMO-OTH radar, an MIMO-OTH radar signal model under the ionized layer double-Gaussian reflection model is established. The MIMO-OTH diversity gain expression and the diversity gain of MIMO-OTH radar target detection under the ionized layer double-Gaussian model are obtained by utilizing the Neyman-pearson criterion and the Gaussian optimal detector to establish a hypothesis testing problem and calculating the cumulative distribution function of the statistic. The number of the multiple paths is changed by selecting a proper radar antenna position, and therefore the radar system can obtain the maximum diversity gain. The antenna arrangement method is simple, convenient to operate and capable of improving the detection performance of the radar system.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an antenna arrangement method for improving the detection performance of MIMO-OTH radar in an ionospheric double-Gaussian model. Background technique [0002] sky wave transhorizon ( OTH ) radar is an effective and relatively low-cost wide-area monitoring radar. OTH radar transmits high-frequency energy through the refraction of electromagnetic waves between the ionosphere and the ground or the diffraction of electromagnetic waves along the surface of the earth to detect conventional line-of-sight radars The target detection range of the ultra-long-distance air and sea targets below the horizon that cannot be detected can reach up to 3000km. The signals emitted by OTH radar with different elevation angles have different propagation paths in the complex ionosphere. [0003] Due to the complex layered structure of the ionosphere, the signals emitted at different elevatio...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide an antenna arrangement method for improving the detection performance of MIMO-OTH radar in the ionospheric double Gaussian model, aiming at solving the problem that the signals transmitted at different pitch angles are ionized due to the complex layered structure of the ionosphere. After the layer is reflected and irradiated to the same area, different echo signals are generated, and multipath propagation may cause the radar to misjudge the number of targets, which increases the target detection error.

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