T his paper is based on a second order carrier tracking loop model ,it produce phase plane portrait theory to analyze the reason of cycle slip ,it gives a measure of the per-formance of the two types of loop cycle slip indicators :the mean time of cycle slip and the average probability of cycle slip ,and it gives two types of indexes conversion formula .Spe-cific analysis was given to identify the impact of loop bandwidth ,loop order and the type of loop discriminator on the properties of loop cycle slip .Simulation results illustrated that if the loop noise bandwidth is smaller ,loop order is lower and loop discriminator range is lar-ger ,the ability to restrain cycle slip is better ,and it provided a reference to reduce the loop cycle slip probability in the parameters design .%通过对二阶载波跟踪环路进行建模 ,利用相平面理论分析周跳产生的原因,给出衡量环路周跳性能的两类指标:平均周跳时间和平均周跳概率 ,并得出两类指标的转换公式.具体分析环路噪声带宽、环路阶数、环路鉴别器类型对环路周跳性能的影响.仿真结果表明:较小环路噪声带宽、较低环路阶数、鉴别器鉴相范围较大的环路 ,具有更好的抑制周跳产生的能力 ,为降低环路周跳概率的环路参数优化设计提供参考.
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