US 12,146,937 B2
Distance measurement method and distance measurement apparatus
Genming Ding, Beijing (CN); and Yanong He, Beijing (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Jun. 17, 2022, as Appl. No. 17/842,931.
Application 17/842,931 is a continuation of application No. PCT/CN2020/137467, filed on Dec. 18, 2020.
Claims priority of application No. 201911311965.1 (CN), filed on Dec. 18, 2019.
Prior Publication US 2022/0326370 A1, Oct. 13, 2022
Int. Cl. G01S 13/34 (2006.01); G01S 7/35 (2006.01); H04B 17/318 (2015.01)
CPC G01S 13/34 (2013.01) [G01S 7/354 (2013.01); H04B 17/318 (2015.01)] 15 Claims
OG exemplary drawing
 
1. A distance measurement method, comprising:
receiving a plurality of first echo signals generated within a detection range by a plurality of first radar signals transmitted in a first time segment;
determining, based on the plurality of first echo signals, a plurality of first spectrum data groups corresponding to the plurality of first echo signals, wherein each of the plurality of first spectrum data groups comprises a plurality of pieces of first spectrum data representing a plurality of obstacle points on a to-be-measured object within the detection range, each of the plurality of pieces of first spectrum data comprises a distance value and a signal strength value, the distance value in each piece of the plurality of pieces of first spectrum data represents a distance between an obstacle point represented by each piece of the plurality of pieces of first spectrum data and a transmitting origin of the plurality of first radar signals, the signal strength value in each piece of the plurality of pieces of first spectrum data represents signal reflection strength at the obstacle point represented by each piece of the plurality of pieces of first spectrum data, and a plurality of distance values comprised in each of the plurality of first spectrum data groups are the same;
performing normalization processing on a signal strength value corresponding to each distance value comprised in each of the plurality of first spectrum data groups to obtain a normalized signal strength value corresponding to each distance value comprised in each of the plurality of first spectrum data groups;
determining, based on a normalized signal strength value corresponding to a same distance value in the plurality of first spectrum data groups, a variance value of a signal strength value corresponding to each distance value comprised in the plurality of first spectrum data groups; and
determining a distance between a target obstacle on the to-be-measured object and the transmitting origin based on the variance value of the signal strength value corresponding to each distance value comprised in the plurality of first spectrum data groups, wherein the target obstacle comprises at least one obstacle point, and signal reflection strength at obstacle points in different motion statuses are different.