Interference Probability Calculation Method of Frequency Agile Radar Based on the Spectrum of Interference Signal

With the development of radar technology, frequency agile radar has been widely used in military because of its benefit in anti-jamming situation. In the battlefield, some friendly radars of which the signals are overlapped in the frequency range may interfere with each other when they work synchronously. The interference among friendly radars is mainly caused by the sideband signals of each other, and the spectrums of interference signals are known as they are emitted from friendly equipment. In this paper, the response of radar receiver is analyzed when sideband part of interference signal is injected into the receiver, and a calculation model of sideband signal response is proposed. The probability distribution of frequency alignment between the interference signal and the frequency agile radar receiver is analyzed. Furthermore, an interference probability calculation model of frequency agile radar that is interfered by the sideband signal jamming is proposed based on the jamming power calculation model. With modeling the frequency agile radar and friendly radars in the battlefield situation, the typical friendly radar jamming scenarios are simulated in computer, and the results produced by the calculation model are compared with the simulation results to verify the validity of the calculation model proposed in this paper. The interference probability calculation method of frequency agile radar based on the spectrum of interference signal proposed in this paper can be further extended to calculate the jamming probability of frequency agile radar in electronic countermeasure environment.