Anti stealth radar.

If a SAM is fired at a F-35, by reducing airspeed to below the doppler selection threshold the F-35 may manage to become invisible to anti stealth radar again and let the missile run itself out. Provided that the missile does not yet close in enough to activate its own homing system.

no_name said:

If a SAM is fired at a F-35, by reducing airspeed to below the doppler selection threshold the F-35 may manage to become invisible to anti stealth radar again and let the missile run itself out. Provided that the missile does not yet close in enough to activate its own homing system.

Click to expand...

I don't think suddenly reducing airspeed and hovering is practical -- the hover ability on the F-35B is for VTOL, not extreme manouevering.
If a radar was able to track and engage a LO target, the best course would of action would be to orientate the aircraft, showing the lowest RCS side, and/or maneouvering + flares/chaff.

But if a target was able to suddenly reduce airspeed to near zero, would that render it invisible to radar at all?

Used to work against older radars. But that exploit is most certainly fixed now.

Bltizo said:

I don't think suddenly reducing airspeed and hovering is practical -- the hover ability on the F-35B is for VTOL, not extreme manouevering.
If a radar was able to track and engage a LO target, the best course would of action would be to orientate the aircraft, showing the lowest RCS side, and/or maneouvering + flares/chaff.

But if a target was able to suddenly reduce airspeed to near zero, would that render it invisible to radar at all?

Click to expand...

Or it can dive to tree top level and break the radar lock... most long range radars do not perform very well at tree top levels especially at longer ranges, despite all the claims to the contrary.

But then you get into the range of ground anti-aircraft fire and portable SAMs if they are around.

Chinese development of AESA VHF radars to counter stealth.

y j s.cn/forum.php?mod=viewthread&tid=1045793&extra=page%3D4















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This table here lists the radar performance:



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机动式米波三坐标雷达研究
赵晓东
【摘要】：隐身技术的发展已经大大缩小了目标的可探测特征,因此隐身武器装备的使用对侦察探测系统乃至整个战略、战役及战术防御系统都提出了严峻的挑战。使用米波雷达,一方面可以跳出隐身飞行器现在采用的隐身吸波材料的吸收波段,另一方面由于吸波材料的结构和厚度与波长有密切关系(如谐振型吸波材料的厚度应为波长的1/4),因此飞行器外形设计和吸波涂层厚度与质量的限制难以达到吸收米波的要求,因此米波雷达是探测隐身飞行器的重要手段。 本文首先介绍了米波雷达的应用背景和发展方向,结合国内外的米波雷达装备情况,揭示了米波雷达从两坐标向三坐标转换的必然发展趋势。根据战术使用要求,本文提出了一种机动式米波三坐标雷达方案实现途径。首先描述了雷达系统体制、组成和工作原理,针对传统米波雷达测高精度低、架设撤收慢这两个关键缺点,应用超分辨测高和高机动阵面折叠等先进的技术手段,提出了较为可行的工程解决办法。该雷达采用固态有源T/R组件和两维DBF技术,大大提高了系统任务可靠性和时间资源调度的灵活性。系统工作方式多样,充分发挥低频段反隐身和阵面两维相扫的优势,可探测隐身飞机和中近程TBM目标,将是未来反隐身战场的骨干装备。最后,分析了该雷达系统的威力、精度,并用MATLAB仿真了关键的低仰角测高性能,验证了整个方案的可行性和有效性。
【关键词】：隐身技术 米波三坐标雷达 超分辨
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TN958.8
【目录】：
摘要5-6
Abstract6-8
1 绪论8-13
1.1 研究背景及意义8-9
1.2 国内外发展状况9-13
1.2.1 国外米波雷达装备情况9-12
1.2.2 国内米波雷达装备情况12-13
2 机动式米波三坐标雷达体制与组成13-17
2.1 机动式米波三坐标雷达体制13
2.2 雷达组成13-17
3 雷达工作原理与关键指标分析17-33
3.1 雷达工作原理17-19
3.2 主要分系统简介19-22
3.3 关键指标分析22-33
3.3.1 测高精度22-30
3.3.1.1 指标及其分析22
3.3.1.2 理论计算22-26
3.3.1.3 采用超分辨测高方法数据仿真结果26-30
3.3.1.4 设计方案中采取的措施30
3.3.2 两维DBF技术30-31
3.3.3 数字T/R组件技术31-32
3.3.4 大型天线架设拆收技术32-33
4 雷达工作模式和特殊工作方式设计33-46
4.1 系统工作模式和威力33-42
4.1.1 正常预警模式33-35
4.1.2 搜索屏预警模式35-37
4.1.3 小目标预警模式37-40
4.1.4 驻留预警模式40-42
4.2 弹道导弹预警模式42-43
4.3 超分辨工作模式43-44
4.4 超分辨处理时单个脉冲的能量44-46
5 总结46-47


致谢47-48
参考文献48-49



=============================================================

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Motorized VHF radar coordinate research
Zhao Xiaodong
Abstract : The development of stealth technology has greatly reduced the detectable characteristics of the target , so use stealth weapons detection systems for reconnaissance and throughout the strategic, operational and tactical defense systems poses a severe challenge. Use VHF radar , one can jump absorption bands stealth stealth aircraft now used absorbing materials , on the other hand due to the structure and thickness of absorbing material is closely related to the wavelength (such as the thickness of the resonant wavelength absorbing materials should be 1/4 ) , thus limiting the aircraft exterior design and absorbing coating thickness and quality requirements difficult to achieve absorption UHF , VHF radar is therefore an important means of detecting stealth aircraft. This paper describes the application of the background and development direction of VHF radar , combined with the VHF radar equipment at home and abroad , and reveals the inevitable trend VHF radar to coordinate the transition from the two coordinates. According to the tactical requirements, we propose a self-propelled VHF radar coordinate programs Realization. First described the radar system structure, composition and working principle , the traditional low- VHF radar precision, slow erection dismantling these two key drawbacks application of ultra high resolution and high mobility measured wavefront folding and other advanced techniques, proposed a more feasible engineering solutions . The radar uses solid-state active T / R module and two- dimensional DBF technology , greatly improving the reliability and flexibility of the system task time resource scheduling. System works diverse, fully two-dimensional anti-stealth and low frequency phase sweep front edge , can detect stealth aircraft and short-range TBM target , will be the future backbone of the anti- stealth battlefield equipment . Finally, the power of the radar system , the accuracy and simulation using MATLAB critical high-performance low- elevation measurements to verify the feasibility and effectiveness of the entire program.
Key words : Coordinate VHF radar stealth technology super-resolution
[ Degree-granting units ]: Nanjing University
[ Degree Level : Master
[ Degree-granting Year ]: 2011
【 Key Words 】 : TN958.8
[Contents] :
Summary 5-6
Abstract6-8
1 Introduction 8-13
1.1 Background and Significance 8-9
1.2 Development and abroad 9-13
1.2.1 Foreign VHF radar equipment of 9-12
1.2.2 Domestic VHF radar equipment of 12-13
2 motorized VHF radar coordinate system and the composition of 13-17
2.1 Coordinate motorized VHF radar system 13
2.2 Radar composition 13-17
3 radar works and analysis of key indicators 17-33
3.1 Radar works 17-19
3.2 Introduction to major subsystems 19-22
3.3 Analysis of key indicators 22-33
3.3.1 Measurement precision 22-30
3.3.1.1 Indicators and Analysis 22
3.3.1.2 theoretical calculations 22-26
3.3.1.3 method using super-resolution altimetry data simulation results 26-30
3.3.1.4 measures taken in the design 30
3.3.2 The two -dimensional technology DBF 30-31
3.3.3 digital T / R module technology 31-32
3.3.4 erect a large antenna technology received 32-33 split
4 radar mode , and special design work 33-46
4.1 system operating modes and power 33-42
4.1.1 The normal warning mode 33-35
4.1.2 Search screen warning mode 35-37
4.1.3 small target warning mode 37-40
4.1.4 resides warning mode 40-42
4.2 ballistic missile early warning mode 42-43
4.3 Super-resolution mode 43-44
4.4 super-resolution processing a single pulse energy of 44-46
5 Summary 46-47


Acknowledgements 47-48
References 48-49

it's basically a description of what JY-27A is. I don't think it mentioned AESA in there anywhere. Just VHF phased array radar.

interesting thing is height of the array and its overall size. That thing should have little problem attaining resolution for long range identification and target tracking.