periodic calibration meaning in English

定期校准
周期校准

First , this paper introduces the difference of all - power radiometer and dicke radiometer sensitivity , and gives normal calibration equation and periodic calibration equation of antenna temperature , and analyses calibration error due to square - law detector illinearity
本文在总结前人研究工作的基础上，首先比较了全功率辐射计和迪克型辐射计的灵敏度，讨论了辐射计天线温度的反演和周期定标技术，分析了检波器非线性特性对辐射计定标结果的影响。
The receiver works on active mode and passive mode in different time . in active mode , the receiver is narrow - band and high sensitive , and if phase - lock technology is used to stabilize receiving frequency . and in passive mode , the receiver is an all - power millimeter wave radiometer with periodic calibration to improve measure precision
此接收机采用分时工作体制，在主动工作方式时为窄带的高灵敏度毫米波接收机，接收机中采用中频锁相技术，简化了毫米波锁相带来的困难；在被动工作方式时为全功率型的毫米波辐射计，这种辐射计在每次测量后都采用两个标准源对辐射计定标，实现周期定标，消除因系统增益波动和有效本机噪声波动带来的测量误差，提高测量测量精度。