As security exits are only invoked at channel startup time, security exits are ideal for performing functions that only need to be done once.
由于仅在通道启动时调用安全出口，安全出口对于执行只需执行一次的功能非常理想。
Red key Under normal state, press red key to access to information of current channel, other functions are decided by specific applications.
红色键在正常状态下，按下红色键调出当前频道的信息，其它功能由具体应用决定。
We analyze the pattern function of DBF in subarray under the ideal condition and with channel mismatch, and give the pattern functions of sum and difference beam.
本文分析了子阵d BF在理想通道条件及通道失配情况下的方向性函数，给出了其和差波束方向性函数特性。
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