A Radar Target Detection Method under Multipath Condition

Abstract

The invention discloses a method for detecting a radar target under the multipath condition, and the method is characterized in that the method comprises the following steps: 1, determining the numberof antennas, and setting set-up heights; 2, calculating a test statistic; 3, calculating a detection threshold value; 4, judging whether there is a target or not. A plurality of antennas at differentheights are used for receiving signals, and the method achieves the judgment of whether there is the target or not through the maximum value of the power of the received signals of the antennas. There is no need of target distance and height prior information. The maximum value of the power of the received signals of the antennas is taken as the test statistic, so the method can avoid the attenuation effect caused by multipath scattering to target signals received by the radars, employs the enhancement effect of the multipath scattering for the target signals received by the radars, and can guarantee that the radars has the higher detection probability for the low altitude objects at various heights and distances. The method is small in number of steps, and is small in calculation burden.The modification of the software and hardware of a conventional radar system is smaller, and the method is easy to implement and is high in engineering applicability.

Description

technical field [0001] The invention relates to a radar detection method, in particular to a radar low-altitude target detection method, and more particularly to a radar target detection method under multipath conditions. Background technique [0002] In addition to strong clutter interference, radar also faces multi-path scattering interference when detecting low-altitude targets. For targets with high signal-to-clutter ratio, the main factor affecting the detection performance of radar low-altitude targets is multipath scattering. Multipath scattering includes specular reflection and diffuse reflection. When the local / sea surface is relatively flat, the multipath scattering is dominated by specular reflection, and diffuse reflection can be ignored. The multi-channel target echo reflected by the ground / sea surface and the target direct wave arrive at the radar receiving antenna almost at the same time, and the two superimpose each other to produce an interference effect, ...

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Problems solved by technology

In addition, the above-mentioned patent needs to calculate the absolute value of the echo power of two receiving antennas when calculating the test statistics, and compare these values ​​to take the maximum value. When the number of antennas gradually increases, the amount of calculation will increase.

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