US 12,135,382 B2
Systems and methods for detecting unmanned aerial vehicles via radio frequency analysis
Henning Meyer, Kassel (DE); Nico Otterbach, Fuldatal (DE); and Kai Baumgart, Kassel (DE)
Assigned to Dedrone Holdings, Inc., San Francisco, CA (US)
Filed by Dedrone Holdings, Inc., San Francisco, CA (US)
Filed on Feb. 3, 2023, as Appl. No. 18/164,121.
Application 18/164,121 is a continuation of application No. 16/261,226, filed on Jan. 29, 2019, granted, now 11,585,886.
Claims priority of provisional application 62/623,193, filed on Jan. 29, 2018.
Prior Publication US 2023/0236279 A1, Jul. 27, 2023
Int. Cl. G01S 3/48 (2006.01); G01S 3/04 (2006.01); G08G 5/00 (2006.01); H04B 1/00 (2006.01)
CPC G01S 3/48 (2013.01) [G01S 3/043 (2013.01); G08G 5/0082 (2013.01); H04B 1/0003 (2013.01); H04B 1/0057 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A system, comprising:
a first antenna pair having a first distance and positioned at a first orientation, wherein the first distance is a physical distance between a first antenna and a second antenna of the first antenna pair, and wherein the first distance and the first orientation are for determining an actual origination direction of an RF signal;
a second antenna pair comprising a second distance and positioned at a second orientation, wherein the second distance is a physical distance between a third antenna and a fourth antenna of the second antenna pair;
at least one multiplexer configured to select between RF signals received via the first antenna pair and the second antenna pair; and
a processing unit operatively connected to the first antenna pair, wherein the processing unit includes at least one processor configured to:
configure the first antenna pair to receive the RF signal at a particular frequency;
receive the RF signal via the first antenna and the second antenna of the first antenna pair;
determine a first phase difference between the RF signal received via the first antenna and the RF signal received via the second antenna;
in response to determining the first phase difference, calculate a first set of at least one origination direction of the RF signal based on the first phase difference, the first distance, and the particular frequency;
receive, via switching the at least one multiplexer to the second antenna pair, the RF signal via the third antenna and the fourth antenna of the second antenna pair;
determine a second phase difference between the RF signal received via the third antenna and the RF signal received via the fourth antenna;
in response to determining the second phase difference, calculate a second set of at least one origination direction of the RF signal based on the second phase difference, the second distance, and the particular frequency; and
compare the first set of the at least one origination direction to the second set of the at least one origination direction to determine a common origination direction, wherein the common origination direction corresponds to the actual origination direction of the RF signal.