Doppler weather radar has important applications in measuring the intrinsic factors of cloud, rainfall and various convective weather occurrences. Among them, CINRAD/CB Doppler weather radar is based on the requiremen...Doppler weather radar has important applications in measuring the intrinsic factors of cloud, rainfall and various convective weather occurrences. Among them, CINRAD/CB Doppler weather radar is based on the requirements of the China Meteorological Administration and many units have been provided. The modulator is a critical part of the transmitter’s high voltage, where high voltage, high current, and energy conversion are concentrated. It is therefore necessary to redesign the transmitter modulator cooling system protection. This article describes the new design of hardware and software solutions. The fan is a DV5214/2N DC fan from Ebmpapst, Germany. The speed is up to 5000 rpm, the power is 18.5 W, and the single fan current is about 0.8 A. It is powered by 28 V. The protection board uses a DC/DC module to output a 5 V voltage and a 3.3 V voltage adjustment chip LM1117. The embedded web software is based on the TCP/IP protocol stack provided by MICROCHIP. After the cooling system is designed and installed in the radar station in Xi’an, China and other places, after long-term operation, the comprehensive test shows that the system runs well.展开更多
A new method of single sample polarization filtering is proposed. The algorithm is fast and suitable for the polarization processing of stationary or nonstationary polarized disturbed signals with one or more independ...A new method of single sample polarization filtering is proposed. The algorithm is fast and suitable for the polarization processing of stationary or nonstationary polarized disturbed signals with one or more independent disturbances. A ground wave polarimetric radar with the ability of radio disturbance suppression is then introduced. Some numerical results demonstrate the effectiveness of single sample polarization filtering method for ground wave polarimetric radar.展开更多
面向安防区域的入侵监测过程包括区域边界的入侵报警和区域内部的入侵跟踪。然而,现有的入侵探测雷达技术难以兼顾区域边界和内部的同时监测,并且存在多入侵探测距离分辨率低和抗干扰能力弱的缺陷。提出并实验验证了一种面向入侵监测的...面向安防区域的入侵监测过程包括区域边界的入侵报警和区域内部的入侵跟踪。然而,现有的入侵探测雷达技术难以兼顾区域边界和内部的同时监测,并且存在多入侵探测距离分辨率低和抗干扰能力弱的缺陷。提出并实验验证了一种面向入侵监测的复合式随机码雷达系统。该雷达系统结合了基于泄漏电缆的导波雷达和基于喇叭天线的一发多收雷达。前者用于实现区域边界的入侵报警,后者继而负责区域内部的入侵跟踪,最终实现监测区域的全面覆盖并消除监测盲区。此外,该雷达系统采用高速、正交的随机码信号作为上述两种雷达的发射信号。实验结果表明所提出的雷达系统不仅可以实现多个入侵者的同时报警和跟踪,而且具有强抗干扰能力。受益于随机码信号的高速率和自相关特性,导波雷达和一发多收雷达可以分别实现30 cm和15 cm的高距离分辨率,且抗干扰容限可以达到33.5 d B。展开更多
文摘Doppler weather radar has important applications in measuring the intrinsic factors of cloud, rainfall and various convective weather occurrences. Among them, CINRAD/CB Doppler weather radar is based on the requirements of the China Meteorological Administration and many units have been provided. The modulator is a critical part of the transmitter’s high voltage, where high voltage, high current, and energy conversion are concentrated. It is therefore necessary to redesign the transmitter modulator cooling system protection. This article describes the new design of hardware and software solutions. The fan is a DV5214/2N DC fan from Ebmpapst, Germany. The speed is up to 5000 rpm, the power is 18.5 W, and the single fan current is about 0.8 A. It is powered by 28 V. The protection board uses a DC/DC module to output a 5 V voltage and a 3.3 V voltage adjustment chip LM1117. The embedded web software is based on the TCP/IP protocol stack provided by MICROCHIP. After the cooling system is designed and installed in the radar station in Xi’an, China and other places, after long-term operation, the comprehensive test shows that the system runs well.
文摘A new method of single sample polarization filtering is proposed. The algorithm is fast and suitable for the polarization processing of stationary or nonstationary polarized disturbed signals with one or more independent disturbances. A ground wave polarimetric radar with the ability of radio disturbance suppression is then introduced. Some numerical results demonstrate the effectiveness of single sample polarization filtering method for ground wave polarimetric radar.
文摘面向安防区域的入侵监测过程包括区域边界的入侵报警和区域内部的入侵跟踪。然而,现有的入侵探测雷达技术难以兼顾区域边界和内部的同时监测,并且存在多入侵探测距离分辨率低和抗干扰能力弱的缺陷。提出并实验验证了一种面向入侵监测的复合式随机码雷达系统。该雷达系统结合了基于泄漏电缆的导波雷达和基于喇叭天线的一发多收雷达。前者用于实现区域边界的入侵报警,后者继而负责区域内部的入侵跟踪,最终实现监测区域的全面覆盖并消除监测盲区。此外,该雷达系统采用高速、正交的随机码信号作为上述两种雷达的发射信号。实验结果表明所提出的雷达系统不仅可以实现多个入侵者的同时报警和跟踪,而且具有强抗干扰能力。受益于随机码信号的高速率和自相关特性,导波雷达和一发多收雷达可以分别实现30 cm和15 cm的高距离分辨率,且抗干扰容限可以达到33.5 d B。
