US 12,169,251 B2
Indirect radar detection
Douglas Roger Pulley, Bath (GB)
Assigned to XMOS LTD, Bristol (GB)
Appl. No. 17/597,095
Filed by XMOS LTD, Bristol (GB)
PCT Filed May 13, 2020, PCT No. PCT/EP2020/063372
§ 371(c)(1), (2) Date Dec. 27, 2021,
PCT Pub. No. WO2020/259916, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 1909303 (GB), filed on Jun. 28, 2019.
Prior Publication US 2022/0244352 A1, Aug. 4, 2022
Int. Cl. G01S 7/41 (2006.01)
CPC G01S 7/414 (2013.01) [G01S 7/412 (2013.01)] 19 Claims
OG exemplary drawing
 
16. An apparatus comprising:
a radar front end for implementing radar detection at a radar frequency of 2 GHz or greater to determine radar response profiles of an environment;
a memory storing a steady state response profile of the environment, the steady state response profile comprising an indication of one or more reflected signals caused by reflection of an emitted radio frequency signal from a first object in the environment, the first object having a first radar cross section, RCS;
a processor configured to:
use the radar front end to determine a test response profile;
compare the test response profile with the steady response profile stored in the memory to identify at least partial absence of at least one of the reflected signals in the test response profile indicative of an object of lower RCS than the first RCS being present in the environment;
in response to determining presence of the object of lower RCS in the environment, generate an output indicating presence of the object of lower RCS in the environment; and
estimate a velocity of the object of lower RCS based on a duration of the at least partial absence of the at least one of the reflected signals and an expected horizontal size of the object of lower RCS.