A low-altitude target detection method for frequency diversity array radar

Abstract

The invention discloses a frequency diversity array radar low-altitude target detection method, which belongs to the field of phased array radar low-altitude target detection. First of all, the scanning characteristics of the FDA radar make its beam pointing related to the radial distance and the frequency difference. By introducing a frequency difference between different transmitting array elements, the signal-to-noise ratio caused by the multipath effect in the low-altitude target environment can be effectively suppressed. loss. Then, the generalized likelihood ratio test (GLRT) method is used to derive the FDA radar low-altitude target detector, which can effectively improve the target detection probability under the condition of a certain false alarm rate. Finally, through the design of sub-modules such as matrix multiplication and matrix determinant calculation, the FDA radar low-altitude target detector is realized on the FPGA hardware platform, which effectively improves the real-time performance of FDA radar low-altitude target detection. To sum up, this method can effectively complete the detection of low-altitude targets by using the scanning characteristics of FDA radar in the low-altitude target environment, and has high practicability in modern warfare.

Description

technical field [0001] The invention belongs to the field of phased array radar low-altitude target detection, in particular to a frequency diversity array (FDA) radar low-altitude target detection method. Background technique [0002] In modern warfare, the use of low-altitude and ultra-low-altitude aircraft to attack the enemy's important military facilities has become an important means to change the course of the war. This type of low-altitude target has low flying altitude, fast speed, small radar reflection area, and can use natural obstacles to avoid radar detection and air defense weapon attacks, causing great threats and damage to air defense systems. Therefore, research on low-altitude target detection technology has important significance and broad military application prospects. [0003] The main factors affecting the performance of low-altitude target detection are clutter and multipath effects. Many scholars have proposed effective suppression methods for mult...

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Problems solved by technology

But when the number of frequency orthogonal signals is small, the probability of cancellation is still very high

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