低空目标的探测与跟踪是雷达所面临的四大难题之一。
Low altitude target detection and tracking is one of the four difficult problems for radar.
本文从利用多径效应的角度研究低空目标的高度测量。
The paper discusses low-angle target altitude measurement using multipath effect.
研究了基于时延估计的低空目标声测无源定位理论与算法。
The theory and algorithm for low altitude target localization based on time delay estimation (TDE) is studied.
高频地波雷达是对海面、低空目标进行超视距探测的重要手段。
High frequency surface wave radar is an important tool of the over horizon detection of sea and low-altitude targets.
合理选择反射区曲线的长度，可减少近地物反射的杂波，提高低空目标的探测能力。
Through selecting appropriate curve length of the reflection surface, it can reduce the reflection clutter of the near ground and improve the detection ability of low altitude.
合理选择反射区曲线的长度，可减少近地物反射的杂波，提高低空目标的探测能力。
Through selecting appropriate the curve length of the reflection surface, it can reduce the reflection clutter of the near ground and improve the detection ability of low altitude.
预警机具有低空目标警戒和空中作战指挥能力，在现代战争中占有极其重要的地位。
The early waring airplane(EWA) is a special type of airplane which has ability to monitor targets in lower attitude and to control air fighting , so that it plays an important role in modern war.
杂波是雷达信号检测和处理的固有环境，严重影响了雷达低空目标探测与跟踪的性能。
Clutter is connatural condition of signal measuring and processing, which affect the radar's detectability and tracking ability of low-altitude target seriously.
针对多径效应的问题，首先建立海面低空目标的跟踪模型，分析了目标、镜像和雷达之间几何关系。
For the problem of multi-path effects, firstly the low-angle target tracking model of sea-surface is built up, and the geometric relationship among target, image and radar is analyzed.
本文以高距离分辨率技术为基础，通过理论分析和仿真，寻找一种解决低空目标探测与跟踪的新途径。
Through theory analysis and simulation, this article presents a new method of low altitude target detection and tracking, based on high distance resolution technology.
分析了低空目标声源的产生机理、目标辐射噪声在大气中的传播特性以及影响其传播的几个主要因素。
The mechanism of the produce of target noise, its transmission characteristics in air and several main factors that influence the sound transmission are analyzed.
分析了超宽带冲激脉冲雷达与连续波雷达的不同的回波特性，指出冲激脉冲雷达对超低空目标探测的潜在优势。
Differences of echo characteristic between impulse radar and continuous wave radar are analyzed, and the potential of UWB impulse for Super-Low-Altitude target-detection is remarked.
针对广泛采用的平面四元十字阵定位方法存在的固有缺点，提出了基于五元十字阵的低空目标声测无源定位算法。
Considering the problems facing by the localization method for widely used four-element cross array, a five-element cross array scheme is proposed.
对于空气污染程度仍然很高的国家，尽管它们实施了相关政策来降低空气污染，作为世卫组织准则的一部分，也对之提出了过渡目标，鼓励其逐步缩减排放物。
The WHO guidelines provide interim targets for countries that still have very high levels of air pollution to encourage the gradual cutting down of emissions.
它能在任何气候条件下发现目标，并能从雷达地面杂波中探测出低空飞行的飞机。
It can locate targets in all weather conditions and detect low flying aircraft in radar ground clutter.
研究了用地面声阵列传感器进行低空飞行目标跟踪问题。
The problem of using sound array sensors to track low altitude flying target is studied.
低空导航与夜视寻的红外吊舱，尽管它是设计用来精确投掷激光制导炸弹的，但它还能够用来帮助我们确认被救援者的位置并且连续跟踪地面与空中的目标。
The LANTIRN pod, though it's designed to deliver laser-guided bombs precisely to a target, allows us to locate the survivor and keep track of things on the ground and in the air.
当红外预警系统对低空飞行的运动目标进行检测时，由于云杂波的存在，系统的检测性能会受到严重影响。
When infrared warning system detect moving objects in low altitude, detection performance will decrease significantly due to the cloud appeared in the image.
针对反低空小目标大组网系统的布阵问题，提出了一种基于方向概率的评估指标体系。
To solve the ground weapon network optimization problem against small object of low altitude, a new evaluation index system was proposed based on the concept of direction probability.
因此，有效地抑制这种时间非平稳和空间非平均的杂波干扰是雷达系统有效完成地面目标和低空飞行目标检测必须解决的首要问题。
The key to the settlement of the question of effective detection of ground and low air targets lies in adaptive of effective clutter suppression in airborne Radar.
本文是低空红外预警系统的一部分，主要研究了红外目标跟踪系统与高帧频图像拼接显示系统的处理算法、硬件结构和实现。
This system can greatly improve the nights fighting ability of the aerial defend army. The infrared target tracking system, which this article mainly research on, is one part of this system.
大量的低空背景景物以及点目标的特点——远距离、低信噪比、强杂波等，增加了目标检测和跟踪的难度。
A lot of low altitude objects and the characteristics of point target make the detection and tracking even harder.
在某电视跟踪系统中应用该算法进行低空飞行目标跟踪实验，取得了良好的跟踪效果。
In a TV tracking system, the algorithm proposed in this paper has been applied in experiments of low-altitude flying targets tracking, which have achieved good tracking results.
由于雷达探测存在盲区，低空与超低空飞行的入侵目标给雷达防御系统带来困难与威胁。
Due to the existence of radar blind spot, the invasive goals flying at low altitude and very low altitude will bring problems and threats to the defense radar system.
目标识别是战场低空飞行目标声预警技术的核心内容之一。
Passive acoustic recognition for helicopters and cruise missiles is battlefields has attiacted great importance.
本文从舰载红外警戒系统的实际需要出发，针对海空背景下低空来袭反舰导弹目标，深入研究了导弹的红外辐射特征，并建立了其红外辐射的简化模型。
According to the practical need of infrared surveillance system, the infrared radiation feature of missile and predigest model under the background of sea and sky was studied.
本文从舰载红外警戒系统的实际需要出发，针对海空背景下低空来袭反舰导弹目标，深入研究了导弹的红外辐射特征，并建立了其红外辐射的简化模型。
According to the practical need of infrared surveillance system, the infrared radiation feature of missile and predigest model under the background of sea and sky was studied.
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