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全部话题 - 话题: radars
首页 5 6 7 8 9 末页 (共10页)
u**********t
发帖数: 401
1
来自主题: Automobile版 - 求个人fight with TVB经验
whitestone bridge,警察藏在桥头里面 (无明显警车标志),我过去了,他跟上一直
到toll booth之前才亮灯而且一直跟我很近,说我30限速开64,total 1K多罚单+8点,
我一直开车很注意,不可能开那么快,最多到50多点,而且其他车都是开那么快,估计
看我是外州车牌。
我有行车记录仪,不知道能否截图说明问题 (我打算就说我老婆自己录着玩的,好像
有人不是很喜欢行车记录仪),
1. 他警车车窗一直关闭,而且有tint,不知道能否说radar不准确,
2. 警车有盲点,不是可以从很远就locate我,有桥和之前的车挡住视线,而且他的车
头是朝行进方向,向后看不是非常clear
3. 他车跟上我之后旁边还有车超我,而且显示我前面的车离我越来越远,不知道是不
是可以说moving radar record的不是我?
都说和TVB搞几乎个人不可能赢,但是我的case有没有可能。求建议!
PS:NY的speeding罚单会让CT的保险涨么?谢谢
做了一晚上功课,准备从两方面cross exam警察
1. stationary radar: angle, radio go ... 阅读全帖

发帖数: 1
2
来自主题: Faculty版 - 硅谷码工的工资这么高啊!
Terman一开始只致力于Research的,但没过多久,他就嗅觉到硅谷这块地,对实际应用
的需求会在未来爆炸性增长的,我多么希望他老人家永远活下去啊。。。。这么有
vision的人才,上帝就该开出一张免死通知单。。。对人类进步将是缩短几十年的历程
。。。
During World War II, Terman directed a staff of more than 850 at the Radio
Research Laboratory at Harvard University. This organization was the source
of Allied jammers to block enemy radar, tunable receivers to detect radar
signals, and aluminum strips (“chaff”) to produce spurious reflections on
enemy radar receivers. These countermeasures significantly reduced the
e... 阅读全帖
c******o
发帖数: 486
3
【 以下文字转载自 WaterWorld 讨论区 】
发信人: chenqtao (peach), 信区: WaterWorld
标 题: MH370航班失踪爆炸地点之我见
发信站: BBS 未名空间站 (Mon Mar 10 00:15:32 2014, 美东)
详见
http://blog.renren.com/share/229203211/17029186724
作为一个长期坐飞机的国际老混子,距离达到一个地月来回的人,应该有必要来研究一
下这个事情。
结论:消失地点应该在 N:8度0分 E: 103度30分
论证:先看第一副截图
如 果这个人所说属实,那么基本上只要找着两条航线的交叉点就行了,这就是精确定
位。因为大家要注意,只有航班在我国境内由于空中管制很厉害,都必须走航道, 在
大多数国家和地区都是可以走测地线的,我们不妨假定都走了测地线。而一般要到接近
目的地机场才会偏离测地线选择盘旋降落,反之起飞也是一样。所以在离开 起飞或者
降落机场有段距离时一般飞机就在目标机场和出发机场所连接的测地线上
MU5093航班 路线为从昆明KMG到新加坡SIN,而失踪航班MH370是... 阅读全帖
c******o
发帖数: 486
4
来自主题: WaterWorld版 - MH370航班失踪爆炸地点之我见
详见
http://blog.renren.com/share/229203211/17029186724
作为一个长期坐飞机的国际老混子,距离达到一个地月来回的人,应该有必要来研究一
下这个事情。
结论:消失地点应该在 N:8度0分 E: 103度30分
论证:先看第一副截图
如 果这个人所说属实,那么基本上只要找着两条航线的交叉点就行了,这就是精确定
位。因为大家要注意,只有航班在我国境内由于空中管制很厉害,都必须走航道, 在
大多数国家和地区都是可以走测地线的,我们不妨假定都走了测地线。而一般要到接近
目的地机场才会偏离测地线选择盘旋降落,反之起飞也是一样。所以在离开 起飞或者
降落机场有段距离时一般飞机就在目标机场和出发机场所连接的测地线上
MU5093航班 路线为从昆明KMG到新加坡SIN,而失踪航班MH370是从吉隆坡KUL到北京PEK。
我们着两条路径的交叉点,下面这些图都是利用了openflights.org输入相关信息而得
到,每个人都可免费注册。并且得到google earth的确认

交叉点坐标是N:8度35分 E: 103度40分
这个地点比前面雷达消失... 阅读全帖
K**********n
发帖数: 1197
5
来自主题: EE版 - 版上有人懂这个技术没?
学术界珍稀有限的原版外文资料,
Remote Mind Control Technology

Reprinted from SECRET AND SUPPRESSED: BANNED IDEAS AND HIDDEN
HISTORY, edited by Jim Keith, $12.95, available from
1-800-680-INET.
There had been an ongoing controversy over health effects of electromagnetic
fields (EMF) for years (e.g., extremely low frequency radiation and the
Navy's Project Seafarer; emissions of high power lines and video display
terminals; radar and other military and industrial sources of radio
frequencies and micr... 阅读全帖
c******l
发帖数: 3
6
来自主题: Engineering版 - help!!!! Signal processing
I have to determine a topic for my thesis now. All what I can choose are from
radar, 
I do not have strong background of radar or signal processing, but I am
interesting with the field. Would somebody give me some suggestion about radar
or radar signal processing? What directions should I consider ? Sorry for the
poor English, cannot input Chinese at school. It’s really a headache problem
for me …..
h*******e
发帖数: 5550
7
来自主题: _Xiyu版 - speed ticket--斗争还是从了?
几点经验,希望对大家有帮助:
1。条子抓你的时候,如果说雷达测的,一定一定当时就要求看证据!不要怕罗嗦。(
可惜这个偶当时根本不知道,傻傻就签了字。)
2。Trail by Written Declaration,尽量专业,逻辑清楚。--特别感谢liu把律师写的
给我参考,受益良多!(可惜written还是被判guilty,呵呵)
3。Written输了表灰心,重新找条子要证据,准备上庭用。(结果是我要的东,他给的
西,而且文件漏洞不少。)
4。这条特别针用雷达测出的超速罚单:
"According to the operations manuals that come with police radar, to ensure
accuracy every radar unit is supposed to be calibrated with tuning forks
before each and every working shift and also before and after being used to
detect each speeding violation. T... 阅读全帖
c***s
发帖数: 70028
8
Lady Gaga恋爱了
Lady Gaga恋爱了!据来自美国娱乐网站Radar的消息称,Lady Gaga已经与美剧《吸血鬼日记》(Vampire Diaries)的男星、30岁的泰勒·金尼(Taylor Kinney)相恋,两人曾在今年7月底合作拍摄Lady Gaga新歌《You And I》的MV,就是在那次合作的过程中,Lady Gaga和泰勒·金尼擦出了爱的火花,两人一直秘密约会至今。一位知情人告诉Radar网站:“他们的相恋是偶然的,但随后他们的关系发展非常迅速。”
美国当地时间9月4日,Lady Gaga和泰勒·金尼非常低调的来到一家海滩酒吧消遣,但后来人们还是发现了她,一位目击者声称:“第一眼根本没认出Lady Gaga,他们当时跟其他热恋中的情侣并无两样。但随后我意识到这个人就是Lady Gaga,现场的人都炸了锅。Lady Gaga的态度非常友善,她甚至给一些拿着自己照片的人签名留念。”
第二天,也就是9月5日,Lady Gaga又被发现与泰勒·金尼手牵手在路上漫步。一位目击者告诉Radar网站:“Lady Gaga当时的头发有点儿乱,她肯定还有一些宿醉,他们两人完... 阅读全帖
c**i
发帖数: 6973
9
David A. Fulghum, Okinawa Decision Has Missile Defense Element. Aviation
Week, May 25, 2010.
http://www.aviationweek.com/aw/generic/story_channel.jsp?channel=defense&id=news/asd/2010/05/25/01.xml&headline=Okinawa%20Decision%20Has%20Missile%20Defense%20Element
My comment:
(a) Active electronically scanned array (AESA) is a type of phased array
radar; AESAs allow ships and aircraft to broadcast powerful radar signals
while still remaining stealthy. Wikipedia.
Raytheon's AESA Combat Aircraft Radars
c**i
发帖数: 6973
10
来自主题: Military版 - 俄中谈判苏35、苏33战机交易
VOA Chinese, July 26, 2010.
http://www1.voanews.com/chinese/news/20100726-russia-99225019.html
Note:
(a) Russia may sign first Su-35 warplane export deal by yearend. Ria Novosti
, July 21, 2010.
http://en.rian.ru/mlitary_news/20100721/159895960.html
("The plane is equipped with an advanced passive electronically scanned
array radar and digital fly-by-wire and a rear-looking radar for firing Semi
-Active Radar missiles. It is designed to carry 8 tons of weapons for a
distance of up to 3,550 kilom
A*******e
发帖数: 12486
11
来自主题: Military版 - China Clones, Sells Russian Fighter Jets
ZHUHAI, China—A year after the collapse of the Soviet Union, a cash-strappe
d Kremlin began selling China a chunk of its vast military arsenal, includin
g the pride of the Russian air force, the Sukhoi-27 fighter jet.
For the next 15 years, Russia was China's biggest arms supplier, providing $
20 billion to $30 billion of fighters, destroyers, submarines, tanks and mis
siles. It even sold Beijing a license to make the Su-27 fighter jet—with im
ported Russian parts.
Today, Russia's military bonan... 阅读全帖
g**1
发帖数: 10330
12
http://goo.gl/4Co7F
New generation of unmanned spy planes is being tested
Three drones being flown in the coming weeks are speedier, stealthier
and higher-flying.
By W.J. Hennigan, Los Angeles Times
An experimental spy plane with a wingspan almost the size of a Boeing
747's took to the skies over the Mojave Desert last week in a secret
test flight that may herald a new era in modern warfare with robotic
planes flying higher, faster and with more firepower.
The massive Global Observer built by Ae... 阅读全帖
y******9
发帖数: 606
13
中国不知道,但是美国一直在搞radar,并且funding不少
我找工作的时候,去monster什么的,一水radar engineer,除了四大军工,还有
lincoln lab之流的小军工常年招
radar engineer,还不说那些univerrsity里面的research group
只要有citizenship,搞雷达那真是捧着金饭碗啊
其实这种东西,也是综合实力,一phased array attenna, 100万个ic circuit都不止
,一个前同事在raytheon上班,说
raytheon真是烧钱啊,不过人target也很明确,performance world record
对了,打个岔,前些时候南棒北棒闹起来的时候,据他说raytheon一片欢呼,不知道这
次丝带,是不是也要欢呼...
b********n
发帖数: 38600
14
http://gizmodo.com/5928295/chinas-df+21d-missile-is-a-one+shot-
Since the end of WWII, America's naval might has been undisputed and our
aircraft carriers have been its crown jewels. However, the days of dominance
could end with China's new DF-21D ballistic missile—the only device on
Earth capable of sinking an aircraft carrier—four and a half acres of
sovereign US territory—with one shot.
VIDEO: http://www.youtube.com/watch?v=Pi0d-eFiGN4&feature=player_embedded
The DF-21D (Dong-Feng 21 variant ... 阅读全帖
p*********g
发帖数: 9527
15
The Shikishima (PLH 31) is the largest patrol vessel of the Japan Coast
Guard, and in the world. She was built by Ishikawajima-Harima Heavy
Industries Tokyo.
Planned to guard plutonium transport ships, the Shikishima is the largest
and heaviest-equipped patrol vessel of the JCG. With her cruising capacity,
she can make voyages from Japan to Europe without making any calls.
She is the only JCG ship equipped with anti-air radar and Oerlikon 35 mm
twin cannons, so she has increased anti-air firepow... 阅读全帖
a**e
发帖数: 8800
16
http://www.shtfplan.com/headline-news/obama-to-shut-down-southe
As the U.S. government continues to expand surveillance and monitoring
systems to the tune of hundreds of billions of dollars within the borders of
the United States, a recent announcement regarding the country’s southern
air defense systems is raising eyebrows.
Our southern border is, in part, protected by the Tethered Aerostat Radar
System (TARS), which utilizes moored balloons hovering at about 15,000 feet
to identify low flying ... 阅读全帖
g**1
发帖数: 10330
17
来自主题: Military版 - 美军成功进行海基反导ZT
原来是末端反导。
U.S. Navy sailors aboard USS Lake Erie (CG-70) received tracking information
from space tracking and surveillance satellites and launched the missile
before the shipboard SPY-1 radar detected the target. The Aegis BMD Weapon
System then guided the missile using tracking information from the space-
based assets until the target was detected and tracked by the SPY-1 radar.
The shipboard radar transmitted guidance commands to the SM-3 guided missile
that intercepted the target.
w*******e
发帖数: 15912
18
来自主题: Military版 - 浅说弹道导弹打航母(转载)
浅说弹道导弹打航母
文学城首页 » 热点讨论主题 » 网上谈兵 » 浅说弹道导弹打航母
作者 Chiyankun 于 2013-10-15 20:26:20
这个问题在几年前曾经热烈讨论过。当时张召忠将军也认为弹道导弹就是按照预定轨道
飞行不可能打航母。他说的当然是一种传统的弹道导弹,即所谓惯性制导的导弹才是这
样按照预定导弹飞行的。
那么给弹道导弹加上末端制导是不是可以打击移动目标?
有个谚语说,理论是灰色的,而生活之树长青。弹道导弹也不是一成不变的,也在不断
发展。
现在有人说,导弹速度高精度就低,弹道导弹打航母是不可能的。对于那些只相信美国
人的朋友,我不妨举一个美国的例子,就是潘兴-II战术导弹。它的射程可达1800公里
,十二倍声速,它再入大气层之后做一次末端制导,圆周精度可以达到30米。注解1,
是从维基百科拷贝下来的,给虎落平原等网友扫扫盲。
但是导弹打航母却有一个很大的困难,困扰 了苏联许多年,就是弹道导弹(除了短程
导弹之外)都要飞出大气层,再重新进入大气层的时候,在电离层——又称热层——导
弹的“眼睛”,无论是雷达还是光电探测器,都不能... 阅读全帖
c*********n
发帖数: 115
19
http://news.yahoo.com/oil-slicks-spotted-hunt-jet-239-aboard-19
KUALA LUMPUR, Malaysia (AP) — Vietnamese air force planes on Saturday
spotted two large oil slicks close to where a Malaysia Airlines Boeing 777
went missing earlier in the day, the first sign that the aircraft carrying
239 people had crashed.
Related Stories
Oil slicks found in hunt for missing Malaysia jet Associated Press
Vietnam spots oil slicks in hunt for missing jet Associated Press
China-bound Malaysian jet vanis... 阅读全帖
y*****n
发帖数: 145
20
看来你没了解清楚
普通民航只用secondary radar
军事才是primary radar
刚刚新浪也有专家说了
secondary radar的transponder(应答机)
可以人工关闭
n*****t
发帖数: 22014
21
来自主题: Military版 - 这些乘客作为人质还活着
http://www.nytimes.com/2014/03/11/world/asia/q-and-a-on-the-dis
Q. How could a Boeing 777 simply vanish? Aren’t they always tracked by
radar or satellites?
A. Radar coverage is not universal, especially over water. In areas without
radar, pilots are generally required to radio in their positions at fixed
intervals, mostly to assure that air traffic controllers can keep aircraft
out of one another’s way. Between intervals, something could go wrong.
Planes like the 777 also have automatic systems ... 阅读全帖
o*****D
发帖数: 1563
22
Highlights of Prime Minister Datuk Seri Najib Razak's statement on MH370
1、It is confirmed that the Aircraft Communications Addressing and Reporting
System (ACARS) was disabled just before the aircraft reached the East coast
of peninsular Malaysia.
2、Later, the aircraft’s transponder was switched off near the border
between Malaysian and Vietnamese air traffic control.
3、The aircraft shown in Royal Malaysian Air Force primary radar previously
is confirmed as flight MH370. This is based on raw sa... 阅读全帖
w**a
发帖数: 2461
23
Russia “Puzzled” Over Malaysia Airlines “Capture” By US Navy
美国海军“俘获”马来西亚航班,俄罗斯“很困惑”
Posted by EU Times on Mar 14th, 2014
载于欧盟时报,2014.3.14
A new report circulating in the Kremlin today prepared by the Main
Intelligence Directorate of the General Staff of the Armed Forces (GRU)
states that Aerospace Defence Forces (VKO) experts remain “puzzled” as to
why the United States Navy “captured and then diverted” a Malaysia
Airlines civilian aircraft from its intended flight-path to their vast and
highly... 阅读全帖
n****l
发帖数: 3375
24
来自主题: Military版 - MH370失联事件真相大白了
从里面说的细节来看,基本就是真相了
申明:
1.中文翻译有一些错误,比如吉隆坡翻译成科隆坡,印度洋翻译成大西洋。如有类似的
翻译错误,请以英文为准。
2.转载这三篇文章,不代表我同意这些文章的意见,仅仅是提供一个角度,供大家参考
。真实性请自行判断。
文章链接:
第一篇
http://www.eutimes.net/2014/03/russia-puzzled-over-malaysia-air
Russia “Puzzled” Over Malaysia Airlines “Capture” By US Navy
美国海军“俘获”马来西亚航班,俄罗斯“很困惑”
Posted by EU Times on Mar 14th, 2014
载于欧盟时报,2014.3.14
A new report circulating in the Kremlin today prepared by the Main
Intelligence Directorate of the General Staff of the Armed Forces (GRU)
states that Aerospace ... 阅读全帖
b***c
发帖数: 1460
25
俄罗斯证实马航370客机被美军俘获到印度洋迭戈加西亚海军基地,因为飞机上可能带有
俄罗斯证实马航370客机被美军俘获到印度洋迭戈加西亚海军基地,因为飞机上可能带
有生化武器,用于袭击正在召开两会的北京。
这消息是14号出来的,很多内容都被证实,中国知道,马来西亚知道,美国知道,就是
不想让公众知道,怕引起恐慌,所以做了很多掩饰。
美国手里的核或生化武器被人抢走(护送两人被杀),它们上了370航班。
美国人知道是什么,中、俄不知道是什么。中国得到了消息,准备把它迫降在海南
(降落北京太危险了)。
美国人把它拦截到迭戈加西亚海军基地紧急处置。
美国海军“俘获”马来西亚航班,俄罗斯“很困惑”
Posted by EU Times on Mar 14th, 2014
载于欧盟时报,2014.3.14
A new report circulating in the Kremlin today prepared by the Main
Intelligence Directorate of the General Staff of the Armed Forces (GRU)
states tha... 阅读全帖
d****0
发帖数: 502
26
来自主题: Military版 - 马航新消息
欧盟时报:俄军总参情报总局报告马航370被美海军俘获至迪戈加西亚基地
MH370没事,俄军总参谋部情报总局证实客机是被美军俘获到印度洋迭戈加西亚海军基
地,因为飞机上可能带有生化武器,用于袭击正在召开两会的北京。
这消息是14号出来的,很多内容都被证实,中国知道,马来西亚知道,美国知道,就是
不想让公众知道,怕引起恐慌,所以做了很多掩饰。
美国手里的核或生化武器别抢走(护送两人被杀),它们上了370航班。
美国人知道是什么,中、俄不知道是什么。中国得到了消息,准备把它迫降在海南
(降落北京太危险了)。
美国人把它拦截到迭戈加西亚海军基地紧急处置。
美国海军“俘获”马来西亚航班,俄罗斯“很困惑”
Posted by EU Times on Mar 14th, 2014
载于欧盟时报,2014.3.14
A new report circulating in the Kremlin today prepared by the Main
Intelligence Directorate of the General Staff of the Armed Forces (GRU)
s... 阅读全帖
f********t
发帖数: 6999
27
绝非大片所能及!
MH370没事,俄罗斯证实客机是被美军俘获到印度洋迭戈加西亚海军基地,因为飞机上
可能带有生化武器,用于袭击正在召开两会的北京。
这消息是14号出来的,很多内容都被证实,中国知道,马来西亚知道,美国知道,就是
不想让公众知道,怕引起恐慌,所以做了很多掩饰。
美国手里的核或生化武器被抢走(护送的两人被杀),它们上了370航班。
美国人知道是什么,中、俄不知道是什么。中国得到了消息,准备把它迫降在海南
(降落北京太危险了)。
美国人把它拦截到迭戈加西亚海军基地紧急处置。
美国海军“俘获”马来西亚航班,俄罗斯“很困惑”
Posted by EU Times on Mar 14th, 2014
载于欧盟时报,2014.3.14
A new report circulating in the Kremlin today prepared by the Main
Intelligence Directorate of the General Staff of the Armed Forces (GRU)
states that Aerospace Defence Forces (... 阅读全帖
w*****8
发帖数: 703
28
Downed Airliner: Fake Audio Tape Shows US-Backed Hit to Frame Russia
West Blaming Putin for MH17 tragedy.
West Blaming Putin for MH17 tragedy.
Within hours of Malaysia Airlines Flight MH17 crashing into a wheat field in
the Donetsk region of eastern Ukraine last Thursday, Western governments
and media have gradually stoked a frenzy of accusations that Moscow had a
hand in the disaster.
by Finian Cunningham
Strategic Culture
In a devastating twist to emerge over the weekend it now seems that the
... 阅读全帖
w********s
发帖数: 1570
29
来自主题: Military版 - 飞机显然是天气原因坠毁的
05:36 QZ8501 departed Juanda airport, Surabaya
06:12 Contacts Jakarta center 125.70 at FL320, requests weather deviation
left of M635 airway and climb to FL380
06:16 QZ8501 still observed on radar
06:17 Radar contact lost. Radio contact lost. Only ADS-B signal remained.
06:18 All contact lost. Only flight plan view on radar screen.
07:08 ATC declares INCERFA (aircraft position uncertain)
07:28 ATC declares ALERTFA (emergency alert)
07:55 ATC declares DETRESFA (emergency distress)
u***r
发帖数: 4825
30
http://www.nytimes.com/2015/01/29/us/charles-h-townes-physicist
Charles H. Townes, a visionary physicist whose research led to the
development of the laser, making it possible to play CDs, scan prices at the
supermarket, measure time precisely, survey planets and galaxies and even
witness the birth of stars, died on Tuesday in Oakland, Calif. He was 99.
His daughter Linda Rosenwein confirmed his death.
In 1964, Dr. Townes and two Russians shared the Nobel Prize in Physics for
their work on micro... 阅读全帖
x****u
发帖数: 12955
31
来自主题: Military版 - 151舰被老舰“击沉”

Something doesn't make sense here. How did it find 151 in the first place
without using its own radar? If 112 used radar, 151 should have received
radar warning, and knew the direction it was coming from.
This is more like a case of exercise set up designed as one of those "use
low tech weapon to attack high tech enemy" show. 151 had to fail.
d*b
发帖数: 21830
32
来自主题: Military版 - 151舰被老舰“击沉”
你就别卖弄了。你连radar horizon的概念都没有,事实上你单考虑地球形状的话,20
米眼高能观测的最大距离只是16nm而已,但radar探测的距离比这个远多了,25米眼高
的Furuno能探测的大概是20nm(我鳖潜艇大多用这个),Raytheon可以探测到50-80nm,
我不知道151上面的凯歌雷达如何,但radar horizon在导航上并不是最重要的指标,重
要的是角分辨率。
151舰的问题并不是开没开防空雷达,它的问题是当防空雷达没开机的时候,凯歌导航
雷达的信号竟然没输入指挥系统,也许我鳖的bridge只是bridge,跟作战指挥系统不是
一个部门,这才是问题的关键。
你要对现代舰艇指挥系统了解的话,就会明白现代指挥系统只是一个带很多接口的CPU
,但恰恰是151上的没凯歌的接口。
151上的自动导航雷达用的是上海无线电厂的凯歌。
h*********g
发帖数: 9102
33
来自主题: Military版 - 包子的丑事被外媒发现了
Highlight 1: Heroic and Model Troops will be reviewed for the first time.
Eight Highlights in China's V-Day Military Parade
(Source: China Military Online) 2015-08-14
BEIJING, August 13 (ChinaMil) -- September 3, 2015 is China's first
Victory Day of the Chinese People's War of Resistance against Japanese
Aggression.
On that day, the celebration of the 70th anniversary of victory of
Chinese People's War of Resistance against Japanese Aggression and the World
Anti-Fascist War will be staged at t... 阅读全帖
c*******2
发帖数: 617
34
美国证谣了, F-22很容易被发现
1. 如果挂了副油箱, 飞机就不再隐形
2. 或者如果加装a Luneburg lens,飞机也很容易被发现。
3. 就算隐形, 也只是针对雷达的 C, X, Ku and the top part of the S bands.
S or L band的雷达可以很容易发现F-22或F35, J20, J31. 美军不怕这种雷达,
因为这种雷达无法精确引导导弹。
Typically, however, those lower-frequency radars do not provide what
Pentagon officials call a “weapons quality” track needed to guide a
missile onto a target. “Even if you can see an LO [low observable] strike
aircraft with ATC radar, you can’t kill it without a fire control system,”
an Air Force... 阅读全帖
G*******n
发帖数: 6889
35
来自主题: Military版 - 中国2020年登陆火星
http://gbtimes.com/china/china-racing-make-2020-launch-window-m
Andrew Jones
2016/02/22
Mars Exploration Rover Spirit captures a stunning view as the sun sank below
the rim of the Gusev crater on Mars on May 19, 2005.Mars Exploration Rover
Spirit captures a stunning view as the sun sank below the rim of the Gusev
crater on Mars on May 19, 2005. (Photo: NASA/JPL/Texas A&M/Cornell)
Tags:
China's space programMarsNational Space Science CenterChina Aerospace
Science and Technology CorporationEur... 阅读全帖
G*******n
发帖数: 6889
36
来自主题: Military版 - 中国舰载预警机
啥扯淡,谁说AESA不能在平面的盘子里?
https://en.wikipedia.org/wiki/Beriev_A-100
The A-100 is designated as the izdeliye PM, a project meant to develop a
replacement for the A-50 AWACS aircraft. The aircraft is based on the
improved Il-476, which has new PS-90A-76 turbofans that are 15% more
powerful than the D-30KP used by the Il-76. The external shape of the A-100
will be similar to the A-50, with the main radar array housed in a rotating
dome mounted on two struts above the fuselage. The new Vega Premier AESA... 阅读全帖
n***y
发帖数: 2730
p***n
发帖数: 17190
38
https://www.storm.mg/article/871096
【國際廣角鏡】中國雷達、俄製防空系統慘遭以色列摧毀……中俄武器真的不堪實戰嗎?
王臻明 2019-01-25 18:40
13073 人氣

Pantsir-S1防空系統。(Vitaly V. [email protected]/CC BY-SA 4.0)
Pantsir-S1防空系統。(Vitaly V. [email protected]/CC BY-SA 4.0)
是說以色列這兩天在敘利亞擊毀了一座中國製的JY-27預警雷達、以及俄羅斯的Pantsir
-S1防空系統(北約命名「SA-22」),引起一些討論。許多人認為俄系武器在實戰中根
本不堪一擊,而中國號稱可以反制匿蹤戰機的雷達,連以色列的F-16戰機都偵測不到。
Heshmat Alavi
@HeshmatAlavi
· 2019年1月23日
回覆給 @HeshmatAlavi
#BREAKING
Damascus Int'l Airport before & after Israel's latest air/m... 阅读全帖
t********h
发帖数: 456
39
"The first forty-two PAF production aircraft are equipped with the NRIET KLJ
-7 radar,[84][85] a variant of the KLJ-10 radar developed by China's Nanjing
Research Institute of Electronic Technology (NRIET) and also used on the
Chengdu J-10. Multiple modes can manage the surveillance and engagement of
up to forty air, ground, and sea targets; the track-while-scan mode can
track up to ten targets at BVR and can engage two simultaneously with radar-
homing AAMs. "
有采用法国或者意大利相控阵雷达升级的计划,但目前都没有落地,中国不愿... 阅读全帖
g**1
发帖数: 10330
40
http://www.thedrive.com/the-war-zone/31187/turkey-tests-f-16s-and-f-4s-against-s-400-radars-in-defiance-of-u-s-sanctions-threats
Turkey Tests F-16s And F-4s Against S-400 Radars In Defiance Of U.S.
Sanctions Threats
The U.S. government has called on its Turkish counterparts for months to not
"activate" the radars and abandon the purchase altogether.
h***n
发帖数: 36
41
There are several books about radar in WWII. The good ones are "The
invention that changed the world" and "The radar history of world war II".
Britain is the first who built the defense radar network and invented the
magnetron. However, it seems that at the end of WWII, many critical
technique are from US, not UK.
p*********e
发帖数: 32207
42
对RCS的理解似乎不对.并不是简单的等效一个平板的面积.
根据wiki:
http://en.wikipedia.org/wiki/Radar_cross_section
"
Informally, the RCS of an object is the cross-sectional area of a perfectly
reflecting sphere that would produce the same strength reflection as would
the object in question.
"
也就是同等反射效果的球的截面积.
http://www.afwing.com/intro/stealth/1.htm
这个文章是晨枫谈隐身的,写的很好,也可以参考一下.
里面对RCS的定义是一致的:
"
这里,雷达反射面积不是目标的几何截面积,而是一个与目标产生同等回波的金属圆球
的等效截面积
"
同一个文章里同时提到F22的RCS是0.0065m^2.
3.14*x^2=0.0065=> x=0.045m=4.5cm
也就是相当于一个完美的9cm直径的圆球.
乒乓... 阅读全帖
r********n
发帖数: 7441
43
来自主题: Military2版 - Iran Missile Milestones zt
Iran Missile Milestones
http://www.iranwatch.org/wmd/wponac-missilemilestones.htm
Updated July 2011
1985: Then-speaker of the Iranian Majlis Ali Akbar Hashemi Rafsanjani leads
a high-level delegation to Libya, Syria, North Korea and China, reportedly
to acquire missiles.
1985: Iran receives its first Scud-Bs from Libya.
1987: China sells Iran "Silkworm" anti-ship cruise missiles.
1987: Iran reportedly receives approximately 100 Scud B missiles from North
Korea. Iran had allegedly agreed to finan... 阅读全帖
w*******e
发帖数: 15912
44
来自主题: Military2版 - 浅说弹道导弹打航母(转载)
【 以下文字转载自 Military 讨论区 】
发信人: wsnonline (卫所南次郎-子曰:“再得瑟我削你啊!”), 信区: Military
标 题: 浅说弹道导弹打航母(转载)
发信站: BBS 未名空间站 (Thu Oct 17 12:36:20 2013, 美东)
要是96年天朝掌握此大杀器,江core下令往台海的独立号和尼米兹号甲板上扔俩
空包弹,那就爽了!
浅说弹道导弹打航母
文学城首页 » 热点讨论主题 » 网上谈兵 » 浅说弹道导弹打航母
作者 Chiyankun 于 2013-10-15 20:26:20
这个问题在几年前曾经热烈讨论过。当时张召忠将军也认为弹道导弹就是按照预定轨道
飞行不可能打航母。他说的当然是一种传统的弹道导弹,即所谓惯性制导的导弹才是这
样按照预定导弹飞行的。
那么给弹道导弹加上末端制导是不是可以打击移动目标?
有个谚语说,理论是灰色的,而生活之树长青。弹道导弹也不是一成不变的,也在不断
发展。
现在有人说,导弹速度高精度就低,弹道导弹打航母是不可能的。对于那些只相信美国
人的朋友,我不妨举一个美国的例子,... 阅读全帖
w*******e
发帖数: 15912
45
来自主题: Military2版 - 浅说弹道导弹打航母(转载)
【 以下文字转载自 Military 讨论区 】
发信人: wsnonline (卫所南次郎-子曰:“再得瑟我削你啊!”), 信区: Military
标 题: 浅说弹道导弹打航母(转载)
发信站: BBS 未名空间站 (Thu Oct 17 12:36:20 2013, 美东)
要是96年天朝掌握此大杀器,江core下令往台海的独立号和尼米兹号甲板上扔俩
空包弹,那就爽了!
浅说弹道导弹打航母
文学城首页 » 热点讨论主题 » 网上谈兵 » 浅说弹道导弹打航母
作者 Chiyankun 于 2013-10-15 20:26:20
这个问题在几年前曾经热烈讨论过。当时张召忠将军也认为弹道导弹就是按照预定轨道
飞行不可能打航母。他说的当然是一种传统的弹道导弹,即所谓惯性制导的导弹才是这
样按照预定导弹飞行的。
那么给弹道导弹加上末端制导是不是可以打击移动目标?
有个谚语说,理论是灰色的,而生活之树长青。弹道导弹也不是一成不变的,也在不断
发展。
现在有人说,导弹速度高精度就低,弹道导弹打航母是不可能的。对于那些只相信美国
人的朋友,我不妨举一个美国的例子,... 阅读全帖
c******l
发帖数: 3972
46
来自主题: Automobile版 - 雷达测速的原理在这里,权威科普
How does a laser speed gun work to measure a car's speed?
If you have read the article entitled How Radar Works, then you know how
normal radar works. A normal radar set sends out a radio pulse and waits for
the reflection. Then it measures the doppler shift in the signal and uses the
shift to determine the speed.
The new laser speed guns use a more direct method that relies on the
reflection time of light rather than doppler shift. You have probably
experienced the reflection time of sound wave
g********d
发帖数: 19244
47
来自主题: Automobile版 - 吃罚单后到底应该是什么心态
你以为警察就专在高速边上抓开90迈的人么 哥有了radar detector也不会开90迈啊
人家警察就专蹲在speed trap的地方
你人生地不熟 开到了双向六车道的大路上 欢快的奔到了五十多 结果人家才限35 立马
就给你丫按下
或者高速上突然有一段限速减了15 你没看见 或者懒得减速 结果就该你上来骂街了
你别以为你开车小心谨慎天天限速-5 就没事了 黑你的地方多得是

买“radar detector”的目的是什么呢:没radar的地方我超速,有的地方我好好开?
你真的在乎省的那点时间?“宁停三分,不抢一秒”。大道理听起来不一定好听,但是
有道理呀。在国内大城市可能不现实,但美国农村,可行的。
t***y
发帖数: 741
48
来自主题: Automobile版 - 很无辜的ticket,上庭求助
many times, the cop does not turn on the radar when cruising, and a radar
detector will be useless if he was blocked by the big SUV.
I had a radar detector before (Escort high end). I no longer use it just
because that reason. It gives one a false sense of "security".
g********d
发帖数: 19244
49
来自主题: Automobile版 - 电子狗是怎么被侦测到的?
radar detector工作的时候会发散一种电波,可以被侦测到
最新的radar detector detector技术似乎是Spectre IV
cobra的新型号不会被Spectre IV或之前的radar detector detector技术侦测到
w*****n
发帖数: 214
50
来自主题: Automobile版 - 今天装了反测速设备
一是,楼主花钱去买laser detector是自个的事情,只要合理合法真没必要乱想会超速
造成事故的。这种心态就和看人家染了头发就觉得人家不是正经人一样,其实完全没必
要。
另外,有个radar detector对开车安全有好处的。举两点,一个是修路路段,radar 一
般都会警告,开车时就会小心。二是,开车大于一定时间,会有点小迷糊,但并不是疲
劳驾驶,也没有超速,radar冷不丁的来那么一下,绝对可以让你清醒大半个小时。
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