摘要
电离层非相干散射雷达目前是唯一能测量整个电离层高度的探测设备,测量区域可覆盖60千米到2000千米左右的高度范围,能够对多种电离层的等离子体重要参数进行测量,是探测电离层强有力的工具。要从非相干散射雷达微弱的回波信号功率谱中提取电离层参数,为了达到一定的距离分辨率和探测距离,则需要对发射脉冲进行调制,探测波形的选择和设计至关重要。研究非相干散射雷达信号处理的原理以及波形设计方法,分析三种基本的编码(巴克码、长脉冲编码、交替码),对各种编码进行仿真,并比较优缺点,结果表明巴克码抗噪性能最好,长脉冲编码可获得最多的信息,交替码介于两者之间,上述分析结果为探测波形的选择提供很好的依据。
The Incoherent Scatter Radar （ISR） is currently the only equipment to detect the whole ionosphere range, and the measured area can cover from the height of sixty to two thousand kilometers, which can detect a variety of important ionospheric plasma parameters. So ISR has become the most powerful tool to study ionospheric activities. To extract ionospheric valid parameters from the weak echo power spectrum of ISR, it needs to modulate transmitted pulse in order to meet demand of range resolution and detectable range, so the selection and design of detecting waveform is of prime importance. The basic signal processing theory and waveform design of ISR are given, then three specific codes （baker code, long pulse code, and alternating code） are introduced, and simultaneously the simulations of them are shown, after comparing, it shows that noise immunity performance of barker code is the best, and long pulse code can obtain more information of signal, and alternating code is between the two codes. The result can provide good basis to choose the detecting waveform.
出处
《计算机仿真》
北大核心
2017年第1期16-19,47,共5页
Computer Simulation
基金
国家自然科学基金(41364006)
江西省高等学校科技落地计划项目(KJLD14004)
关键词
非相干散射
编码
仿真
Incoherent scatter
Encoding
Simulation
