US 11,656,326 B2
Radar elevation angle measurement
Jonathan C. Berry, San Jose, CA (US); and Duc H. Vu, Sunnyvale, CA (US)
Assigned to Argo AI, LLC, Pittsburgh, PA (US)
Filed by Argo AI, LLC, Pittsburgh, PA (US)
Filed on Sep. 21, 2020, as Appl. No. 17/27,468.
Prior Publication US 2022/0091229 A1, Mar. 24, 2022
Int. Cl. G01S 7/40 (2006.01); G01S 13/08 (2006.01); G01S 13/931 (2020.01)
CPC G01S 7/40 (2013.01) [G01S 13/08 (2013.01); G01S 13/931 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A radar elevation angle measurement system comprising processing circuitry coupled to storage, wherein the processing circuitry is configured to:
transmit one or more signals from a radar towards a reflection structure comprised of a plurality of corner reflectors each including a front surface that reflects the one or more signals and a back surface that absorbs the one or more signals, wherein the reflection structure also comprises a plurality of motors for individually rotating each of the plurality of corner reflectors about an azimuth axis of the reflection structure, and wherein the plurality of corner reflectors are positioned at different vertical elevation levels along the reflection structure;
receive echo signals at the radar from at least one of the plurality of corner reflectors that has been rotated to an ON position where the front surface is positioned toward the radar;
collect data associated with the echo signals received from the at least one of the plurality of corner reflectors that has been rotated to the ON position;
identify peak signal values based on the collected data; and
calculate a radar pitch angle of the radar based on the peak signal values.