US 12,000,949 B2
Power-efficient formulation of tandem-hopped radar and communications
Gerald Brandon Ravenscroft, Overland Park, KS (US); Patrick M. McCormick, Berryton, KS (US); Shannon D. Blunt, Shawnee, KS (US); Erik S. Perrins, Lawrence, KS (US); and Justin G. Metcalf, Dayton, OH (US)
Assigned to University of Kansas, Lawrence, KS (US); and The United States of America as Represented by the Secretary of the Air Force, Washington, DC (US)
Appl. No. 17/269,077
Filed by University of Kansas, Lawrence, KS (US); and THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE, Washington, DC (US)
PCT Filed Sep. 21, 2019, PCT No. PCT/IB2019/058001
§ 371(c)(1), (2) Date Feb. 17, 2021,
PCT Pub. No. WO2020/065483, PCT Pub. Date Apr. 2, 2020.
Claims priority of provisional application 62/737,074, filed on Sep. 26, 2018.
Prior Publication US 2021/0208237 A1, Jul. 8, 2021
Int. Cl. G01S 7/00 (2006.01); G01S 13/34 (2006.01); H04L 27/26 (2006.01)
CPC G01S 7/006 (2013.01) [G01S 13/347 (2013.01); H04L 27/2626 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of generating a composite radar and communication waveform, the method comprising:
generating, by a processor, a frequency modulated (FM) radar waveform;
determining, by the processor, a communication signal;
iteratively executing, by the processor, a shaping process against the FM radar waveform and the communication signal until a first stop criterion is satisfied to produce an initial composite radar and communication waveform having the communication signal embedded within at least a portion of the FM radar waveform;
iteratively executing, by the processor, an enhancement process against the initial composite radar and communication waveform and the communication signal until a second stop criterion is satisfied to produce a final composite radar and communication waveform, wherein the final composite radar and communication waveform is a constant amplitude waveform, and wherein the communication signal is embedded within at least a portion of the final composite radar and communication waveform; and
transmitting, by a transmitter, the final composite radar and communication waveform.
 
19. A non-transitory computer-readable storage medium storing instructions that, when executed by one or more processors, causes the one or more processors to perform operations for generating a composite radar and communication waveform, the operations comprising:
generating a frequency modulated (FM) radar waveform;
determining a communication signal;
iteratively executing a shaping process against the FM radar waveform and the communication signal until a first stop criterion is satisfied to produce an initial composite radar and communication waveform having the communication signal embedded therein, and wherein each iteration of the shaping process comprises:
imposing a spectral shaping constraint on a spectrum of the initial composite radar and communication waveform;
creating a notch in a portion of the spectrum of the initial composite radar and communication waveform;
embedding the communication signal within the notch of the initial composite radar and communication waveform; and
modifying at least one characteristic of the initial composite radar and communication waveform subsequent to embedding the communication signal within the notch of the initial composite radar and communication waveform;
iteratively executing an enhancement process against the initial composite radar and communication waveform and the communication signal until a second stop criterion is satisfied to produce a final composite radar and communication waveform, wherein the final composite radar and communication waveform is a constant amplitude waveform having the communication signal embedded therein, and wherein each iteration of the enhancement process comprises:
creating a notch in a portion of the spectrum of the final composite radar and communication waveform and embed the communication signal within the notch of the final composite radar and communication waveform; and
modifying a characteristic of the final composite radar and communication waveform, the characteristic comprising one of a constant amplitude characteristic of the final composite radar and communication waveform and a pulsewidth characteristic of the final composite radar and communication waveform;
transmitting the final composite radar and communication waveform;
receiving echoes of the transmitted final composite radar and communication waveform; and
performing radar detection operations based on the received echoes of the transmitted final composite radar and communication waveform.