Method for suppressing direct-current leakage of frequency-modulated continuous-wave landing radar

• Main Authors: XUN SHAOWEI, ZHANG LINRANG, LIU NAN, GUO KAISI, YANG DONGFAN
• Format: Patent
• Language: Chinese; English
• Published: 08.06.2018
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention discloses a method for suppressing direct-current leakage of a frequency-modulated continuous-wave landing radar so that problems of high equipment requirement, low estimation accuracy,and limited application range in the prior art can be solved. The method comprises: firstly, acquiring echo signals of a frequency-modulated continuous-wave landing radar during positive and negativefrequency modulation cycles based on triangular modulation; secondly, carrying out dechirping processing, FFT processing and non-coherent accumulation on the echo signals during the positive and negative frequency modulation cycles successively to obtain difference frequency spectrums; and thirdly, carrying out cancellation on the difference frequency spectrums of the positive and negative frequency modulation cycles and carrying out windowing processing to obtain a difference frequency spectrum after direct-current leakage suppression. According to the invention, the direct-current leakage issuppressed and thus the su