摘要
回波强度标定技术直接关系到定量测量的准确度,是新一代天气雷达组网定量测量的基础,是提高天气雷达探测精度的重要手段。简要介绍了新一代天气雷达系统的回波强度自动标校技术,并以CINRAD/CC雷达为例,对新一代多普勒天气雷达(CINRAD/CC)自动标校的技术原理作了详细分析,对其在自动标校中采用的DDS(Direct Digital Synthesis)技术以及标校技术的实施方法作了具体的介绍,对其回波强度自动标校的准确度进行了测量,给出了系统自动标校的实际检验结果。结果表明该系统发射参数、接收参数在出现较大变化时,能保证回波强度的测量准确度在1 dB以内。还对影响自动标校准确度的因素作了分析。
The calibration technology of radar reflectivity is directly related to the precision of radar quantitative measurement, being the fundamental factor for radar observation. Taking CINRAD/CC radar as an example, the principles of automatic calibration technology, the DDS （Direct Digital Synthesis） technique, which is used in calibration, and the implementation procedures are described in detail. The precision of automatic echo intensity calibration was measured and the testing results are given. The findings conclude that C[NRAD/CC can ensure the precision less than 1dB while the transmitter power and receiver gain change. The factors influencing the precision of automatic calibration are also analyzed.
出处
《气象科技》
2007年第3期418-422,共5页
Meteorological Science and Technology
