The design and simulation of a small active Loran-C receiving antenna
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摘要: 针对罗兰-C无线电导航信号接收需求，研究一种高性能的罗兰-C小型有源接收天线，可以减小天线体积和安装难度，方便罗兰-C导航接收机的使用，具有较高的实用意义. 天线主体采用磁棒线圈天线接收长波频段罗兰-C信号，在天线内设计了包含放大电路、带通滤波电路、差分输出电路和供电电路在内的前端信号调理电路，从而增大信号灵敏度，提高信噪比；设计了一体化的天线结构，以便工程化应用. 通过仿真和实测结果表明：该天线在工作频带内，可以全向高效接收罗兰-C信号，而且对接收到的微弱罗兰-C信号进行放大并滤除带外噪声，信号强度和信噪比满足使用要求. 该天线具有体积小、灵敏度高、使用方便的特点，可应用于罗兰-C无线电导航，组合导航、附加二次相位时延计算等场景.Abstract: Aiming at the needs of Loran-C to receive radio navigation signals, a high-performance Loran-C small active receiving antenna is studied, which can greatly facilitate the use of Loran-C navigation receivers. It is of high practical significance to reduce the volume of the antenna to reduce the difficulty of installation. The main body of the antenna adopts a magnetic rod coil antenna to receive the Loran-C signal in the long-wave band. The front-end signal conditioning circuit including amplifier circuit, band-pass filter circuit, differential output circuit and power supply circuit is designed to increase signal sensitivity and signal-to-noise ratio; an integrated antenna structure is designed for engineering application. Simulations show that the antenna can efficiently receive Loran-C signals. It can amplify the weak Loran-C signal and filter out out-of-band noise, and the signal strength and signal-to-noise ratio meet the requirements. The antenna has the characteristics of small size, high sensitivity and convenient use, and can be used in Loran-C radio navigation, combined Navigation, additional secondary phase delay calculation and other scenarios.
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Key words:
- Loran-C /
- active receiving antenna /
- magnetic antenna /
- differential amplifier circuit /
- filter circuit
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表 1 不同线圈匝数对应的磁芯直径及电感值
磁芯直径/mm 线圈电感 最优匝数 中波 长波 中波 长波 8 0.2~0.3 1~1.5 60~80 100~150 10 0.2~0.3 1~1.5 35~50 80~120 15 0.2~0.3 1~1.5 20~25 60~80 
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表 2 各级滤波器参数
滤波器级数 通带增益 中心频率/kHz Q 最小GBW需求/MHz 1 1 96.230 4 5.416 52.118 4 2 1 103.917 2 5.416 56.281 6 3 1 91.180 8 13.121 119.638 3 4 1 109.672 2 13.121 143.900 9
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表 3 高通滤波器参数
滤波器级数 通带增益 截止频率/kHz Q 最小GBW需求/MHz 1 1 90 0.51 4.59 2 1 90 0.60 5.40 3 1 90 0.90 8.10 4 1 90 2.56 23.04
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表 4 低通滤波器参数
滤波器级数 通带增益 截止频率/kHz Q 最小GBW需求/MHz 1 1 110 0.51 5.61 2 1 110 0.60 6.60 3 1 110 0.90 9.90 4 1 110 2.56 28.16
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