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Research on the countermeasure against radio-wave interference and on the remote-receiving design, for a NOAA weather-satellite system.

NOAA气象卫星系统无线电波干扰对策及远程接收设计研究。

基本信息

批准号：
18560358
负责人：
CHINEN Koyu
金额：
$ 2.4万
依托单位：
Okinawa National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560358/
关键词：
Low Noise Amplifier RF circuit simulation Weather Satellite Digital Modulation Radio over Fiber Band pass Filter

项目摘要

1. Research on Front-End AmplifierBy using RF circuit simulators, the optimal design of Low Noise Amplifier (LNA) was performed. An EP-HEMT transistor was used for the first stage, and a PHEMT-MMIC was used for the second stage. Each simulation by ADS and Microwave Office showed an equivalent result, the gain was 25dB or more and the NF was 0.8dB or less. The value of EVM was very as small as -43dB, and satisfied the digital modulation transmission performance. It turned out that the design of the LNA is almost possible by using RF simulators such as ADS and Microwave Office, and the final component evaluation can be performed with digital RF communication system. This technique is effective for improvement in circuitry design speed, and the improvement in correlation with a system evaluation. About BPF, it turned out that 6 pole dielectric filter is the optimal. The LNA with 6pole dielectric-filter showed the center frequency of 1.7GHz, the insertion-kiss of 1.45dB, the attenuation ba … More nd of -40dB (1.61 to 1.79GHz), the 80MHz of BPF bands, the gain of 29.2dB, and the NF of 1.39dB. This property is sufficient for the countermeasure against radio-wave interference for NOAA weather-satellite reception.2. Research on Remoteness of Parabolic AntennaThe imaging data from a NOAA weather satellite is a digital signal of BPSK of 6665.4 kl/s. Since there was no actual instrument for the NOM transmitter the digital signals that were modulated with BPSK, QPSK, and 64QAM in the IEEE802.11-16, were used as an equivalent data format of the NOAA signal. The three different types of lasers were evaluated to replace an expensive external modulator of LiNbO3. The lower cost E/O devices of 1.3um and 1.55um MQW-DFB-LDs, which were designed for CATV, were excellent in the linear characteristics. The 1.3um EAMI DFB-LD was designed for the high-speed digital modulation. The evaluation is performed, by changing each conditions of modulation power (-30 to OdBm), modulation frequency (1.7 to 2.4GHz.), optical outputs (3 to 7mW), and optical fiber length (0 or 10km). The Error Vector Magnitude (EVM) and the value of Relative Constellation Error (RCE) etc. were measured and investigated. The DFB-LD of 1.3um and 1.55um showed the almost equivalent property. EAMI-DFB-LD showed relatively large EVM and RCE on the same condition. In conclusion, for NOAA weather satellite reception, it was found that the 1.3um and 1.55um MQW-DFB-LDs designed for CATV were optimal as the E/O devices. Less

1.前端放大器的研究利用射频电路模拟器对低噪声放大器（LNA）进行了优化设计。第一级采用EP-HEMT晶体管，第二级采用PHEMT-MMIC。通过ADS和Microwave Office软件的仿真，得到了等效的结果，增益大于等于25 dB，噪声系数小于等于0.8dB，EVM值非常小，仅为-43dB，满足数字调制传输的要求。结果表明，利用ADS和Microwave Office等射频仿真器可以完成LNA的设计，并可以利用数字射频通信系统进行最终的器件评估。该技术对于提高电路设计速度和提高与系统评估的相关性是有效的。在带通滤波器方面，六极介质滤波器是最佳的。采用6阶介质滤波器的LNA中心频率为1.7GHz，插入噪声为1.45dB，衰减系数为1.45dB， ...更多信息 nd为-40dB（1.61 ~ 1.79GHz），BPF频段为80 MHz，增益为29.2dB，NF为1.39dB。这一特性足以对抗NOAA气象卫星接收的无线电波干扰。NOAA气象卫星的成像数据是6665.4kl/s的BPSK数字信号。由于NOM发射机没有实际的仪器，因此在IEEE802.11-16中使用BPSK、QPSK和64 QAM调制的数字信号被用作NOAA信号的等效数据格式。三种不同类型的激光器进行了评估，以取代昂贵的外部调制器的铌酸锂。为CATV设计的1.3um和1.55um MQW-DFB-LD的低成本E/O器件具有优良的线性特性。设计了1.3um EAMI DFB-LD，用于高速数字调制。通过改变调制功率（-30到0 dBm）、调制频率（1.7到2.4GHz）、光输出（3至7 mW），以及光纤长度（0或10 km）。对卫星的误差矢量幅值（EVM）、相对星座误差（RCE）等进行了测量和研究。1.3um和1.55um的DFB-LD显示出几乎相同的性能。EAMI-DFB-LD在相同条件下表现出较大的EVM和RCE。总之，对于NOAA气象卫星的接收，我们发现为CATV设计的1.3um和1.55um MQW-DFB-LD作为E/O器件是最佳的。少