Method and apparatus for generating orthogonal radar signal based on frequency modulation

A method of generating an orthogonal radar signal based on frequency modulation, the method comprising:

• generating a set of coded frequency-modulation waveforms through element operation between a set of frequency-modulation waveforms and a polyphase code set;
• and
• calculating an objective polyphase code set or an optimized polyphase code set based on a domain parameter that minimizes an objective function for the set of coded frequency-modulation waveforms,
• wherein the objective function is calculated 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 waveforms by a second weighting factor.

An apparatus for generating an orthogonal radar signal based on frequency modulation, the apparatus comprising:

• an element operation module configured to generate a set of coded frequency-modulation waveforms from a set of input frequency-modulation waveforms and a randomly generated polyphase code set;
• a calculation module configured to calculate an objective function for the set of frequency-modulation waveforms with respect to a different set of coded frequency-modulation waveforms and previous sets of coded frequency-modulation waveforms, and select 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 polyphase-code perturbation module configured to perform polyphase-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 calculated 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.