US 11,808,869 B1
High speed correlation direction finding
Richard E. Clymer, Concord, NH (US)
Assigned to BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed by BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed on May 29, 2020, as Appl. No. 16/887,617.
Int. Cl. G01S 3/48 (2006.01); G01S 3/02 (2006.01); H01Q 3/26 (2006.01)
CPC G01S 3/48 (2013.01) [G01S 3/023 (2013.01); H01Q 3/267 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A system comprising:
a platform;
at least one antenna array including a plurality of antennas therein;
a receiver;
at least one processor capable of executing logical functions in communication with the receiver and the at least one antenna array; and
at least one non-transitory computer readable storage medium having instructions encoded thereon that, when executed by the processor, implements operations to determine the direction of origin for an incoming signal, the instructions including:
detect an incoming signal;
collect signal data from the incoming signal;
analyze the collected data using one of a Phase Only Real Correlation Interferometry Direction Finding (POR-CIDF) process and a Real Correlation Interferometry Direction Finding (R-CIDF) process;
wherein the POR-CIDF process comprises calculating a real part of a correlation coefficient according to

OG Complex Work Unit Math
or its mathematical equivalent, where
φmeas,n=Measured phase for the nth element (in degrees with a range from −179.9° to 180.0°)
φcal,n=Calibration phase for the nth element (in degrees with a range from −179.9° to 180.0°)
and wherein the R-CIDF process comprises calculating a real part of a correlation coefficient according to

OG Complex Work Unit Math
or its mathematical equivalent, where

OG Complex Work Unit Math
and
generate a direction finding result representing the direction of origin for the incoming signal.