title: An LFMCW detector with new structure and FRFT based differential distance estimation method.
abstract: This paper describes a linear frequency modulated continuous wave (LFMCW) detector which is designed for a collision avoidance radar. This detector can estimate distance between the detector and pedestrians or vehicles, thereby it will help to reduce the likelihood of traffic accidents. The detector consists of a transceiver and a signal processor. A novel structure based on the intermediate frequency signal (IFS) is designed for the transceiver which is different from the traditional LFMCW transceiver using the beat frequency signal (BFS) based structure. In the signal processor, a novel fractional Fourier transform (FRFT) based differential distance estimation (DDE) method is used to detect the distance. The new IFS based structure is beneficial for the FRFT based DDE method to reduce the computation complexity, because it does not need the scan of the optimal FRFT order. Low computation complexity ensures the feasibility of practical applications. Simulations are carried out and results demonstrate the efficiency of the detector designed in this paper.
authors.affiliation: School of Mechatronical Engineering of Beijing Institute of Technology, Beijing, 100081 China.
authors.forename: Kai
authors.initials: K
authors.lastname: Yue
authors.affiliation: School of Mechatronical Engineering of Beijing Institute of Technology, Beijing, 100081 China.
authors.forename: Xinhong
authors.identifier: 0000-0002-9541-4411
authors.initials: X
authors.lastname: Hao
authors.affiliation: School of Mechatronical Engineering of Beijing Institute of Technology, Beijing, 100081 China.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
keywords: Collision avoidance radar; Differential distance estimation method; Fractional Fourier transform; Intermediate frequency signal based structure; Linear frequency modulated continuous wave detector