CAJ | 학술논문

提出了一种基于时频扩展技术的低截获水声遥控信号设计方法，分别采用多载波技术和直序扩频技术实现水声遥控信号的扩时调制和频谱扩展。分析了信号的时宽带宽对低截获性能的影响，采用Wigner-Ville分布对时频扩展前后信号的能量分布进行了对比研究，利用可检测距离的概念定量分析了信号时频扩展前后的低截获性能。理论分析和仿真结果表明，该时频扩展信号具有低的瞬时功率及谱密度，处理增益大，可检测距离小，能够高可靠地实现信息的隐蔽传输。
제출료일충기우시빈확전기술적저절획수성요공신호설계방법，분별채용다재파기술화직서확빈기술실현수성요공신호적확시조제화빈보확전。분석료신호적시관대관대저절획성능적영향，채용Wigner-Ville분포대시빈확전전후신호적능량분포진행료대비연구，이용가검측거리적개념정량분석료신호시빈확전전후적저절획성능。이론분석화방진결과표명，해시빈확전신호구유저적순시공솔급보밀도，처리증익대，가검측거리소，능구고가고지실현신식적은폐전수。
A low probability of intercept (LPI) signal for underwater acoustic remote control,which is obtained by uti-lizing time-frequency spreading technique, is proposed in this paper. Both the Multi-carrier technique for time spread-ing modulation and the direct sequence spreading spectrum technique (DSSS) are used in the signal design. The rela-tionship between Time-Band width and LPI performance is analyzed, and the comparisons of the energy distribution between original signal and modulated signal are also made. The concept of detectable distance is applied to quantify-ing the LPI performance. Theoretical analysis and computer simulation indicate that this LPI signal has advantages in lower instantaneous power and spectral density, higher processing gain, and closer detectable distance, and so it can be used reliably to achieve the information transmission with a low probability of intercept.