Patent ID: 9590740
Date: 2017-03-07
CPC Classifications: G01S,H01Q,H04B

Claim:
1. A system for robust symmetrical number system photonic direction finding comprising: a reference antenna for receiving an input RF signal, wherein said reference antenna is connected to a first input to a first low noise amplifier (LNA), and to an input to an automatic gain control module (AGC); a first measurement antenna element for receiving a first RF signal, wherein said first RF signal is an identical phase shifted signal of said RF signal, further wherein said first measurement antenna element is separated from said reference antenna a distance d said first phase shifter for shifting a phase of said first RF signal by a phase shift of ψ a second measurement antenna element for receiving a second RF signal, wherein said second RF signal is an identical phase shifted signal of said RF signal, further wherein said second measurement antenna element is separated from said reference antenna a distance d said second phase shifter for shifting a phase of said second RF signal by a phase shift of ψ a third measurement antenna element for receiving a third RF signal, wherein said third RF signal is an identical phase shifted signal of said RF signal, further wherein said third measurement antenna element is separated from said reference antenna a distance d said third phase shifter for shifting a phase of said third RF signal by a phase shift of ψ said AGC, wherein an output of said AGC is connected to a second input to each of said first LNA, said second LNA, said third LNA, and said fourth LNA; said first LNA connected to a first electrode input to each of a first dual electrode Mach-Zehnder modulator (DE-MZM), a second DE-MZM, and a third DE-MZM; said second LNA connected to a second electrode input to said first DE-MZM; said third LNA connected to a second electrode input to said second DE-MZM; said fourth LNA connected to a second electrode input to said third DE-MZM; a continuous wave (CW) laser for generating an optical signal, wherein an output of said CW laser is connected to an input to a 3:1 optical splitter; said 3:1 optical splitter, wherein a first output of said 3:1 optical splitter is connected to an optical input to said first DE-MZM, a second output of said 3:1 optical splitter is connected to an optical input to said second DE-MZM, and a third output of said 3:1 optical splitter is connected to an optical input to said third DE-MZM; said first DE-MZM, wherein an output of said first DE-MZM is connected to an input to a first photodetector (PD); said second DE-MZM, wherein an output of said second DE-MZM is connected to an input to a second PD; said third DE-MZM, wherein an output of said third DE-MZM is connected to an input to a third PD; said first PD, wherein an output of said first PD is connected to an input to a first direct current blocking capacitor (DC BLK); said second PD, wherein an output of said second PD is connected to an input to a second DC BLK; said third PD, wherein an output of said third PD is connected to an input to a third DC BLK; said first DC BLK, wherein an output of said first CD BLK is connected to an input to first envelope detection and normalizing (ENV) module; said second DC BLK, wherein an output of said second DC BLK is connected to an input to a second ENV module; said third DC BLK, wherein an output of said third DC BLK is connected to an input to a third ENV module; said first ENV module, wherein an output of said first ENV module is connected to an input to a first comparator network; said second ENV, wherein an output of said second ENV module is connected to an input to a second comparator network; said third ENV module, wherein an output of said third ENV module is connected to an input to a third comparator network; said first comparator network, wherein an output of said first comparator network is connected to an input to a robust symmetrical number system (RSNS) to direction of arrival (DOA) converter; said second comparator network, wherein an output of said second comparator network is connected to an input to said RSNS to DOA converter; said third comparator network, wherein an output of said third comparator network is connected to an input to said RSNS to DOA converter; and said RSNS to DOA converter, wherein said RSNS to DOA converter includes an output for outputting a generated DOA.