US 11,754,671 B2
Incoming wave count estimation apparatus and incoming wave count incoming direction estimation apparatus
Tadashi Oshima, Tokyo (JP); Yuichi Goda, Tokyo (JP); and Nobuhiro Suzuki, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/44,577
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed May 7, 2018, PCT No. PCT/JP2018/017646
§ 371(c)(1), (2) Date Oct. 1, 2020,
PCT Pub. No. WO2019/215790, PCT Pub. Date Nov. 14, 2019.
Prior Publication US 2021/0199757 A1, Jul. 1, 2021
Int. Cl. G01S 7/35 (2006.01); G01S 3/46 (2006.01); G01S 7/4914 (2020.01); G01S 7/497 (2006.01); G01S 13/933 (2020.01); G01S 13/931 (2020.01); G01S 13/95 (2006.01)
CPC G01S 7/354 (2013.01) [G01S 3/46 (2013.01); G01S 7/497 (2013.01); G01S 7/4914 (2013.01); G01S 13/931 (2013.01); G01S 13/933 (2020.01); G01S 13/95 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An incoming wave count estimation apparatus comprising:
an array antenna including a plurality of element antennas and for receiving a signal radiated from a radio wave source to be targeted; and
processing circuitry performing a process of:
performing spatial averaging of correlation matrices by dividing a received signal of the array antenna to a plurality of subarrays having different shapes and calculating these correlation matrices for the respective subarrays having different shapes;
performing eigenvalue expansion of correlation matrices for the respective plurality of subarrays having different shapes after spatial averaging obtained; and
estimating an incoming wave count by integrating eigenvalues for the respective plurality of subarrays having different shapes obtained.