US 11,892,556 B2
Method and apparatus for generating orthogonal radar signal based on frequency modulation
Hyung Jung Kim, Daejeon (KR); Min Soo Kang, Daejeon (KR); and Sang In Cho, Daejeon (KR)
Assigned to ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed by Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed on Dec. 17, 2021, as Appl. No. 17/554,364.
Claims priority of application No. 10-2021-0118310 (KR), filed on Sep. 6, 2021.
Prior Publication US 2023/0074122 A1, Mar. 9, 2023
Int. Cl. G01S 7/28 (2006.01); G01S 13/42 (2006.01); G01S 13/933 (2020.01)
CPC G01S 7/2813 (2013.01) [G01S 13/428 (2013.01); G01S 13/933 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A method of generating an orthogonal radar signal based on frequency modulation, the method comprising:
a first step of generating a set of frequency-modulation waveforms;
a second step of generating a random polyphase code set;
a third step of generating a set of coded frequency-modulation waveforms through element operation between the set of frequency-modulation waveforms and the polyphase code set;
a fourth step of calculating an objective function for the set of frequency-modulation waveforms with regard to a different set of coded frequency-modulation waveforms and previous sets of coded frequency-modulation waveforms, and selecting a current polyphase code set as an optimized polyphase code set when a result of current calculation is better or smaller than a result of previous iteration; and
a fifth step of performing phase perturbation by replacing an element randomly selected in the current polyphase code set selected as the optimized polyphase code set with another admissible-phase element,
wherein the objective function is defined by a sum of a value, which is obtained by multiplying an autocorrelation sidelobe peak for the set of coded frequency-modulation waveforms by a first weighting factor value, and a value, which is obtained by multiplying a cross-correlation peak for the set of coded frequency-modulation waveform by a second weighting factor.