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回波信号展宽
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     Based on the previous results on the spatial correlation characteristics of some typical land clutter, and in accordance with the specialty of pseudo random code CW (PRC -CW) radar, i.e., the time spread of echo signal under the condition of low grazing angle, a superposition algorithm was used to get real clutter echo of PRC -CW radar. The correlation characteristics of land clutter for PRC -CW radar was investigated with simulation method.
     在分析典型地物杂波的空间分布特性的基础上,针对PRC-CW(伪码调相连续波)雷达的特性,即雷达在低俯视角情形时地面回波信号展宽,利用对码元回波复信号进行空间矢量叠加以得到PRC-CW雷达实际接收的回波信号.通过计算机模拟得到伪码调相连续波雷达回波信号后,对其空间相关特性进行了分析.
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It is pointed out that the raining,also an object in the air,will cause the time spread of radar echo signal. For the phase-modulated pseudo-random code continuous wave (PRC-CW) radar working with continuously transmitting and receiving EM wave .the echo signal at a specified moment will be the superposition of those spreading in a period of time before the specified moment. A superposition algorithm to calculate the CW radar echo signals is proposed. Based on the former previous results on the characteristics...

It is pointed out that the raining,also an object in the air,will cause the time spread of radar echo signal. For the phase-modulated pseudo-random code continuous wave (PRC-CW) radar working with continuously transmitting and receiving EM wave .the echo signal at a specified moment will be the superposition of those spreading in a period of time before the specified moment. A superposition algorithm to calculate the CW radar echo signals is proposed. Based on the former previous results on the characteristics of rain clutter,the amplitude fluctuation and the spectrum of the echo of the pseudo-random code CW (PRC-CW) radar are investigated with simulation method.

分析了降雨这种空中体目标要引起雷达回波信号展宽的事实,对于连续发射和接收的伪码调相连续波雷达来讲,某一时刻的回波信号将是此前一段时间内展宽的回波在此时刻的迭加,提出了计算连续波雷达回波信号的迭加方法,在以往对雨杂波特性研究结果的基础上,模拟研究了该连续波体制下雷达雨杂波的幅度起伏特性和频谱特性,从而可以指导该体制雷达系统的优化设计以及该体制雷达信号处理的设计.

Based on the previous results on the spatial correlation characteristics of some typical land clutter, and in accordance with the specialty of pseudo random code CW (PRC -CW) radar, i.e., the time spread of echo signal under the condition of low grazing angle, a superposition algorithm was used to get real clutter echo of PRC -CW radar. The correlation characteristics of land clutter for PRC -CW radar was investigated with simulation method.

在分析典型地物杂波的空间分布特性的基础上,针对PRC-CW(伪码调相连续波)雷达的特性,即雷达在低俯视角情形时地面回波信号展宽,利用对码元回波复信号进行空间矢量叠加以得到PRC-CW雷达实际接收的回波信号.通过计算机模拟得到伪码调相连续波雷达回波信号后,对其空间相关特性进行了分析.

In this article, the specialt y of pseudo-random code CW(PRC-CW) radar was firstly discussed, then we analyzed the statistical characteristics of some typical land clutter. In accordance with the problem of time spread of echo signal under the condition of low grazing angle, we proposed a superposition method to get real clutter echo of PRC_CW radar.Through the computer simulation, we find out the model of pdf (probability density function) after superposition.

本文首先论述了伪码调相连续波雷达的特殊性,然后分析了一些典型地物杂波的统计特性,在此基础上,针对伪码调相连续波雷达在低俯视角情形时回波信号展宽的问题,提出了对码元回波幅度进行空间矢量迭加以得到实际回波信号的方法,通过计算机模拟,得到了迭加时实际回波的概率密度分布模型.

 
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