公开(公告)号：US20230168329A1

公开(公告)日：2023-06-01

申请号：US18101803

申请日：2023-01-26

Applicant: Socionext Inc.

Inventor： Koichiro TANAKA

IPC: G01S3/46 ,  G01S7/02 ,  H04B7/06

CPC classification number: G01S3/46 ,  G01S7/02 ,  H04B7/06

Abstract: An estimation method includes: receiving, by first and second antennas, radio waves including reflected radio waves that are radio waves transmitted from a transmitting antenna and reflected by a target; calculating a phase difference between first received radio waves that are radio waves received by the first antenna in the receiving and second received radio waves that are radio waves received by the second antenna in the receiving; calculating an amount of correction based on the amplitude of the first received radio waves and the amplitude of the second received radio waves, adding the calculated amount of correction to the phase difference calculated in the calculating of the phase difference, and obtaining a corrected phase difference resulting from correction of the phase difference; and estimating, based on the corrected phase difference and the distance between the first and second antennas, a direction in which the target is located.

公开(公告)号：US20170310350A1

公开(公告)日：2017-10-26

申请号：US15644578

申请日：2017-07-07

Applicant: SOCIONEXT INC.

Inventor： Koichiro TANAKA ,  Takeaki WATANABE

IPC: H04B1/16 ,  H03F3/19 ,  H03G3/30

CPC classification number: H04B1/16 ,  H03F3/19 ,  H03F2200/294 ,  H03F2200/451 ,  H03G3/3036 ,  H03G3/3052 ,  H03G3/3078 ,  H03G2201/202 ,  H04B1/30

Abstract: An AGC circuit for a radio receiver includes a detector converting a high frequency signal into a baseband signal. To reduce generation of a DC offset, the AGC circuit includes: a variable gain amplifier having an amplifier circuit and a high-pass filter, the amplifier circuit amplifying the baseband signal with a variable gain and the high-pass filter coupled to the amplifier circuit and having a cut-off frequency which is variable; a controller supplying a gain control signal; and a blocker temporarily blocking the high frequency signal. Using the block control signal, the controller causes the blocker to start blocking the high frequency signal, before the cut-off frequency of the high-pass filter is switched from high to low.