One possible algorithm of signal processing for airplane detection and parameters estimation using pulsar Forward Scattering Radar (FSR) is proposed. The algorithm for air target detection proposed in the article is intended for pulsar signal processing in a pulsar FSR system. The signal source is a pulsar, the receiver is a radio telescope, and the flying object is an airplane. The pulsar signal processing algorithm consists of a direct pulsar signal compensator and a detector of forward scattering signal obtained from aircraft. The proposed algorithm was simulated in the Matlab environment using a real pulsar signal.