The minimum resolution of the broadband frequency sweeping jamming (BFSJ) bandwidth is set to 1/M of the MFSK signal bandwidth, theoretical derivation of the anti-jamming performance for FH/MFSK systems in noise-free environment and additive white Gaussian noise (AWGN) channels are derived, respectively. The closed-form expressions of bit error rate (BER) are given and validated by computer simulations. The theoretical and simulation results show that the minimum resolution of jamming bandwidth has more influence on the BER performance when the jamming bandwidth becomes smaller. With the increases in the sweeping rate, the BER performance decreases under the given power of sweeping jamming and the bandwidth over AWGN channels.%针对FH/MFSK系统，将宽带扫频干扰带宽最小分辨率精确到MFSK信号带宽的1/M，分别在忽略背景噪声和AWGN信道两种条件下，对系统的抗干扰性能进行了理论推导，给出了误比特率的闭合表达式，并对理论结果进行了仿真验证。结果表明，当干扰带宽越窄，干扰带宽最小分辨率对系统的误比特率结果影响越大；AWGN信道中，在干扰功率、带宽一定的条件下，系统误比特率性能随着扫频干扰的速率增加而下降。理论与仿真结果一致，证明了理论推导的正确性。
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