Note: "有台媒指出,在央视3月份首次曝光的视频画面里,中国像竹竿一样插在地上的国产稀布阵综合脉冲孔径雷达可以撕开美军F-22的隐身外衣,其强大之处在该雷达的探测范围内,F-22只要出现在地平线上就能被及时发现。"
(a) 台媒? It is possible, but I fail to find it. In any event, China for the first time disclosed its new tool to detect F-22s.
小飞猪的防务观察, 中国这堆 '竹竿' 可探测F22 还不怕反辐射导弹(图). 新浪军事, Mar 20, 2018 http://mil.news.sina.com.cn/jssd ... yskeuc4985053.shtml
("3月18日,CCTV-2 [央视] 对话总师请来中国著名雷达专家-吴剑旗同志,他是中国反隐身雷达首席专家,在节目之中透露了中国反隐身雷达最新进展,其中国产稀布阵综合脉冲孔径雷达首次公开亮相,它应该也是世界第一型采用这种技术防空探测雷达。 * * * 所谓稀布阵雷达,它的天线阵元呈现广泛分布状态,实际上是一种多输入多输出技术,可以看做相控阵技术发展,从相关图片可以看到,它与常规雷达存在明显区别,也就是说雷达没有常规平面阵列天线,而采用了多个发射/接收天线,所以主持人和观众还好奇问为何弄了一堆电线杆子上来" which looks like 竹竿 阵)
(i) 稀布阵 / 稀疏阵 = sparse array
(ii) For 多输入多输出, see MIMO https://en.wikipedia.org/wiki/MIMO
("In radio, multiple-input and multiple-output")
(b) The next report -- but not 呂炯昌's -- includes 合成孔徑雷達, without 稀布陣.
(i) 洪哲政, 北斗干擾車 讓陸飛彈失準 必要時進駐總統府. 聯合晚報, Oct 11, 2018. https://udn.com/news/story/11311/3415750
There is no need to read the rest of this report, which says nothing.
(c) China and Taiwan different Chinese names for the same thing:
in China: 综合脉冲孔径雷达技术Synthetic Impulse and Antenna Radar (SIAR)
in Taiwan: 合成孔徑雷達
(i) synthetic-aperture radar https://en.wikipedia.org/wiki/Synthetic-aperture_radar
is usually used to map large-area landscape which is covered by, say, a jungle. So I do not know how it can be used to look into the sky -- because basically the radar in a synthetic-aperture radar has to travel a distance physically.
(ii) Antenna aperture (meaning: opening) is not necessarily a physical opening (obviously originally it was; those antenna which has an aperture is called "aperture antenna"). Whether now with a physical opening or not, an antenna (good or bad) is measured in part by aperture.
(A) the current definition made simple:
Evan Chandler, Introduction to Antenna Theory. SlidePlayer.com, "modified over 3 years ago" https://slideplayer.com/slide/4683597/
(slide 12: "Antenna aperture [-] The area or part of the antenna which extracts power from the wave, that is, which actually comes in contact of EMW [electromagnetic wave] falling on it")
(B) antenna aperture https://en.wikipedia.org/wiki/Antenna_aperture
("The aperture is defined as the area, oriented perpendicular to the direction of an incoming electromagnetic wave * * * Although this concept is based on an antenna receiving an electromagnetic wave * * * Due to reciprocity, an antenna's gain in receiving and transmitting are identical. Therefore, [antenna's effective aperture] [A with a subscript e] can be used to compute the performance of a transmitting antenna also. * * * In general, the aperture of an antenna is not directly related to its physical size. However some types of antennas, for example parabolic dishes and horn antennas, have a physical aperture (opening) which collects the radio waves. In these aperture antennas, the effective aperture [A with a subscript e] is always less than the area of the antenna's physical aperture [A with a subscript 'phys'], otherwise the antenna could produce more power from its terminals than the radio power entering its aperture, violating conservation of energy")