The detection of radar signals is carried out in a jamming environment. Under normal circumstances, the existing interference mainly includes thermal noise, undulating hills, tall buildings and other reflected echoes. These echoes enter the receiver and also cause interference. These disturbances will cause changes in the false alarm rate. This is a problem that should be avoided as much as possible in radar signal reception. Therefore, it is necessary to process the constant false alarm rate to stabilize the false alarm rate in an environment with interference. The constant false alarm rate detection of the signal means that the signal undergoes constant false alarm rate processing when the interference intensity changes to keep the false alarm rate constant.
In a radar system, system noise will vary with system characteristics, receiver gain, etc. The interference of different clutters of various intensities is inevitable. For this reason, signal processing techniques including constant false alarm rate processing are required. . Considering only from the perspective of signal detection, measures to keep the false alarm probability constant-constant false alarm rate processing technology must be taken to achieve constant false alarm rate processing. Therefore, the constant false alarm rate is an important technical indicator of radar signal processing equipment.
The current common radar signal constant false alarm rate processing can be divided into two categories, namely slow threshold processing and shutter limit processing. Here, the test is done by generating a signal with thermal noise and clutter. The simulation diagram is shown in Figure 1.
