CAJ | 학술논문

提出了一种M元正交扩频总体方案,按这种方式传输数据时,发送信号不存在潜在的周期性,数据难以被检测或截获,因此,系统的抗干扰和抗截获性能得到了很好的保障.当伪码较长、载波多普勒频移较大时,传统的同步捕获算法进行的FFT点数较多,复数乘加运算量大,耗时长,而在较长的捕获时间内,捕获得到的参数估计过于陈旧,无法应用于载波跟踪,为此,文中提出了一种改进的快速同步方法.该算法能在搜索出同步点位置的同时,有效估计载波频偏,进行频偏纠正,并且计算复杂度明显降低.
제출료일충M원정교확빈총체방안,안저충방식전수수거시,발송신호불존재잠재적주기성,수거난이피검측혹절획,인차,계통적항간우화항절획성능득도료흔호적보장.당위마교장、재파다보륵빈이교대시,전통적동보포획산법진행적FFT점수교다,복수승가운산량대,모시장,이재교장적포획시간내,포획득도적삼수고계과우진구,무법응용우재파근종,위차,문중제출료일충개진적쾌속동보방법.해산법능재수색출동보점위치적동시,유효고계재파빈편,진행빈편규정,병차계산복잡도명현강저.
Proposed in this paper is a novel method of M-ary orthogonal spread spectrum, with which the potential periodicity of transmitted signals is eliminated and the data are hard to detect or intercept. Thus, both the anti-jamming and the anti-intercept capabilities of the system are well guaranteed. In the condition of long pseudo code and large carrier Doppler frequency shift, the number of FFT points in the conventional synchronous acquisition algorithm is too large, the complex multiplication is of high computational complexity and large time cost, and the parameter evaluation acquired in a long duration is not applicable for carrier tracking because it is too old. In order to solve these problems, an improved fast synchronous acquisition algorithm is proposed, which helps to search for the code synchronization point and estimate the carrier frequency offset for correction, with the computational complexity obviously reduced.