G*******n
发帖数: 6889 | | m********5
发帖数: 17667 | 2 你们老将忘文生义，太挫了
Passive Phased Array Radar，并不是说这个Radar是passive的，这是说这个Phased
array 是passive. 也就是说array只有天线单元，自己不产生功率。
无源相控阵自己不产生辐射，但是雷达必须要有辐射，因此PPA还是必须接驳雷达，有
一个单独的功率放大器，功率经过波导分配到阵列天线。
而有源阵是只阵列每个单独的单元自带功率发生器和接收器，因此不需要功率分配器。
由于这个多余的步骤导致无源阵雷达的电功率效率要比有源阵低，波束质量要比有源阵
低，电磁波有效功率也要比有源阵低。
至于谁的热量多，我倒是不知道，反正只要是阵列，不管有源无源其效率都比一般的雷
达低，发热量大。而无源阵效率更要低得多。
【在 G*******n 的大作中提到】
: 另有无源相控阵雷达比有源相控阵放热多的伪科学
: http://www.mitbbs.com/article/Military2/167685_0.html
| G*******n
发帖数: 6889 | 3 你"不知道"也敢来给伪科普撑腰
http://www.microwavejournal.com/articles/17992-evolution-of-aes
"Aug 14, 2012 ... Figure 1 shows a comparison of PESA and AESA designs,
based on .... Power consumption and cooling are major issues for AESAs and
have..."
https://www.quora.com/What-is-the-difference-between-a-PESA-and-an-AESA-
radar
"In an AESA radar on the other hand, each milk carton sized antenna is
capable of generating its own microwave signal, as well as altering its
phase. Another difference is that, at any given time, each of the antenna
may be operating at a different frequency! Also, an AESA antenna element may
change its frequency of operation around 1000's of times per second. As a
result, the radar beam now does not operate at a single frequency, but
rather, is a very wide band signal. As the radar energy is now spread over a
huge band, instead of a precise single frequency, the enemy thinks that
this signal is simply background noise and ignores it. This is why such
radars are called LPI (low probability of Intercept) radars, and are used in
stealth fighter jets and ships. However, such radars are more costly,
require much more power, and generate lots of heat, which in turn requires
sophisticated cooling systems. "
http://www.freerepublic.com/focus/news/3117715/posts
"You get most of the operational benefits with the passive ones, but not as
long of detection range, for a couple of technical reason. More total power
and lower effective noise figure. The downside is more cost, and maybe more
weight. Cooling the beasts is a challenge too." | m********5
发帖数: 17667 | 4 我不知道你是自己看不懂英文，还是欺负别的老将看不懂英文
你贴出来的英文和我说的有什么区别
说无源阵不发射电磁波的是不是你们老将？！LoL
【在 G*******n 的大作中提到】
: 你"不知道"也敢来给伪科普撑腰
: http://www.microwavejournal.com/articles/17992-evolution-of-aes
: "Aug 14, 2012 ... Figure 1 shows a comparison of PESA and AESA designs,
: based on .... Power consumption and cooling are major issues for AESAs and
: have..."
: https://www.quora.com/What-is-the-difference-between-a-PESA-and-an-AESA-
: radar
: "In an AESA radar on the other hand, each milk carton sized antenna is
: capable of generating its own microwave signal, as well as altering its
: phase. Another difference is that, at any given time, each of the antenna
| G*******n
发帖数: 6889 | 5 你中文英文都看不懂，自己瞎编一个“无源阵不发射电磁波”稻草人，来精神撸管。。。
有源相控阵和无源相控阵，工作时哪个热量散发的比较多，你知不知道？不知道就闭嘴
。。。
【在 m********5 的大作中提到】
: 我不知道你是自己看不懂英文，还是欺负别的老将看不懂英文
: 你贴出来的英文和我说的有什么区别
: 说无源阵不发射电磁波的是不是你们老将？！LoL
|
|
