环路在不同干扰样式下的失锁门限不尽相同。
The PLL has different un-locked threshold value in different jamming model.
采用载波相位观测的GPS导航模式中，导航信号失锁的现象经常发生。
Tte phenomena of lock-lose occur frequently in GPS navigation based on carrier phases.
低阶锁相环跟踪频率斜升信号时产生的稳态相差致使环路失锁，接收机无法锁定载波信号。
Due to steady phase error, low-order PLL has a trouble in tracking frequency ramp signals, so that the receiver cannot lock carrier signals.
本文分析了锁相环调速系统中两种失锁现象的原因，得出相应的计算公式，提出了克服失锁的办法。
Two kinds of cause of losing lock in PLL speed regulation system are analysed. Corresponding formulas are obtained. The ways of overcoming losing lock are put for ward.
即通过采用一个中间分支来解决误差信号归一化的问题，通过多径搜索来解决锁相环容易失锁的问题。
Namely the middle branch was used to solve the first problem, and the way of searching multipath was used to solve the second problem.
利用有效星历所提供的先验信息，对伪随机码的搜索范围进行压缩，缩短了伪随机码失锁重捕的时间；
The searching range of pseudo noise code was narrowed utilizing to the information provided by epicheirema. The lost reacquisition time was shortened.
检验证明该方法能够准确可靠地探测并修复失锁3秒以内的周跳，避免了周跳对载波相位平滑伪距的影响。
This new algorithm can detect and repair cycle slips after loss of lock within 3 seconds so as to avoid the effect of cycle slips on smooth pseudo distance of carrier phase.
最后本文扩展性的论证了GPS接收机失锁情况下，对本文所设计的单频网适配器时间同步所产生的影响。
Finally this expansion of the demonstration of the GPS receiver lost lock circumstances, the single frequency network adapter time synchronization of the impact.
如果C/N0增大，热噪声会相应下降，反之，热噪声会随之增大，从而可能会超出门限值，使跟踪环失锁。
If C/N0 was increased, the noise would decrease, contrariwise noise will increase, and the noise will exceed the threshold, then the loop will be lost.
如果C/N0增大，热噪声会相应下降，反之，热噪声会随之增大，从而可能会超出门限值，使跟踪环失锁。
If C/N0 was increased, the noise would decrease, contrariwise noise will increase, and the noise will exceed the threshold, then the loop will be lost.
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