US 12,153,122 B2
Foreign-object detection system
Tetsuya Kawanishi, Tokyo (JP)
Assigned to Waseda University, Tokyo (JP)
Filed by WASEDA UNIVERSITY, Tokyo (JP)
Filed on Dec. 28, 2021, as Appl. No. 17/563,062.
Application 17/563,062 is a continuation of application No. PCT/JP2020/025025, filed on Jun. 25, 2020.
Claims priority of application No. 2019-121580 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0283291 A1, Sep. 8, 2022
Int. Cl. G01S 13/10 (2006.01); G01S 13/32 (2006.01); G01S 13/34 (2006.01); G01S 13/87 (2006.01); G01S 13/934 (2020.01)
CPC G01S 13/872 (2013.01) [G01S 13/10 (2013.01); G01S 13/32 (2013.01); G01S 13/343 (2013.01); G01S 13/345 (2013.01); G01S 13/934 (2020.01)] 5 Claims
OG exemplary drawing
 
1. A foreign object detection system comprising:
a first radar;
a second radar connected to the first radar via a network; and
a signal source, which is different from the first radar and the second radar, configured to transmit a synchronization signal to the first radar and the second radar via the network, wherein
τ1i denotes time for transmitting the synchronization signal from the signal source to the first radar,
τ2j denotes time for transmitting the synchronization signal from the signal source to the second radar, and
the foreign object detection system controls a delay time corresponding to |τ1i−τ2j| to prevent an interference occurring due to input of a radar signal to the first radar, the radar signal being output from the second radar and reflected by a reflective object,
wherein the first radar and the second radar are provided on the ground, and wherein |τ1i−τ2j| is controlled so as to satisfy |τ1i−τ2j|>2Lm/c (where c denotes a signal velocity and Lm denotes a measurement limit length of the first radar).