The accurate formulas of processing gain are theoretically derived under single-tone interference and narrowband interference in direct sequence spread spectrum( DSSS) communication systems. Moreo-ver, the numerical simulation of derived formulas is performed. The numerical results show that the single-tone interference capability depends on the relative location of carrier frequency between the single-tone interference and the spread spectrum system, and the narrowband interference capability depends on the relative location of carrier frequency and the interference bandwidth. The conclusions provide reference for the design of DSSS communication systems.%针对直接序列扩频系统，理论推导出单音干扰和窄带干扰下系统处理增益的精确计算公式，并对所得公式进行了数值仿真。数值仿真结果表明，单音干扰对直接序列扩频系统的干扰能力与其相对于扩频系统的载波位置密切相关；窄带干扰对直接序列扩频系统的干扰能力与其相对于扩频系统的载波位置和干扰带宽密切相关。研究结果可为直接序列扩频系统的设计提供参考。
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