一种基于脉冲前导的数字相控阵距离校零方法

数字相控阵设备使用了高速AD、FPGA等大量数字器件，每次设备上电重启后，数字器件频率参考时钟的初始相位存在随机性，由此带来的时延抖动导致设备距离零值发生变化。在工程应用中，一般会在每次设备上电重启后实施一次系统校零，以确保测距零值的正确性，但这一处理无疑增加了系统工作的复杂性。提出了一种通过添加前导脉冲控制实现固定传输时延的方法，采用该方法后无需每次上电重复实施系统校零，简化了设备使用模式。仿真测试结果和工程实践验证了方法的有效性。

A calibration method of ranging zero values based on introducing pulse for the digital array

A large number of digital devices are used for the digital phased array device, such as high-speed AD and FPGA. When the device is powered on or restarted each time, there is randomness for the initial phase of the digital device frequency reference clock, which results in time delay jitter and causes changes of ranging zero values of the device. In engineering applications, a system zero value calibration is usually performed when the device is powered on or restarted each time, it can ensure the accuracy of the ranging zero value. However, this processing undoubtedly increases the complexity of the system work mode. This paper proposes a method to achieve fixed transmission delay by adding preamble pulse control. After adopting this method, it is not necessary to repeat zero value calibration every time the power is turned on, which simplifies the use mode of equipment. The simulation test results and engineering practice have verified the effectiveness of this method.