Low-altitude target detection method for frequency diversity array radar

Abstract

The invention discloses a low-altitude target detection method for a frequency diversity array radar, belonging to the field of phased array radar low-altitude target detection. According to the method, due to the scanning characteristics of an FDA radar, the beam direction of the radar is related to a radial distance and a frequency difference, by introducing a frequency difference between different transmitting elements, a signal-to-noise ratio loss brought by a multipath effect in a low-altitude target environment can be effectively suppressed. Then, a generalized likelihood ratio test (GLRT) method is used to derive an FDA radar low-altitude target detector, and a target detection probability can be effectively improved under a certain false alarm rate. Finally, through the design of sub modules of matrix multiplication, matrix determinant calculation the like, an FDA radar low-altitude target detector is realized in an FPGA hardware platform, and the real-time detection of the FDAradar low-altitude target detection is effectively improved. In summary, according to the method, in a low-altitude target environment, the scanning characteristics of the FDA radar can be used to effectively complete the detection of a low-altitude target, and the method 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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