According to the difference of Doppler spectra of meteor trail echo and clutter of ground and sea, a FIR high-pass filter is designed to filter out clutter and so the meteor trail echo becomes obvious. Then a smart threshold is obtained from the minimum mean of different segments of background noise and used to detect the meteor trail echo. Finally the phase discontinuity of clutter from the meteor trail echo suppression is eliminated by substituting the data at echo positions with clatter.

該文根據(jù)地海雜波與流星干擾在多普勒譜上的差別花蝴蝶免费视频高清版下载，提出了用FIR型高通濾波器濾除雜波使流星干擾凸顯出來www.99riav.1vip；再根據(jù)流星干擾的分布特點(diǎn)分段計(jì)算背景噪聲均值av黄色在线观看免费，求取流星干擾檢測(cè)門限亚洲速播18禁久久久久久；最后用雜波信號(hào)來插值流星干擾位置上的數(shù)據(jù)，消除因去除干擾造成的雜波相位不連續(xù)18禁在线永久免费观看不卡。

Meteor showers and occasional meteor is essentially different from the meteor shower is an important feature of all meteors reverse extend lines intersecting point to radiation.

流星雨與偶發(fā)流星有著本質(zhì)的不同日韩在线最新专区，流星雨的重要特征之一是所有流星的反向延長(zhǎng)線都相交于輻射點(diǎn)。

In Paris, the METEOR automated rapid transit system, which employs Matra SACEM technology, has been operating since October 1998, transporting 40,000 passengers per hour.

手工腦力翻譯欧美色淫淫，杜絕機(jī)譯在巴黎日韩精品导航大全视频在线播放，使用馬特拉SACDEM技術(shù)的METEOR自動(dòng)捷運(yùn)系統(tǒng)從1998年就開始運(yùn)行，每小時(shí)運(yùn)送旅客四萬人欧美va在线视频品。

If a meteoroid enters the Earth's atmosphere, it is heated by friction and appears as a glowing streak of light called a meteor.

如果一個(gè)流星體進(jìn)入地球的大氣層日韩制服丝袜无码网站视频，它因?yàn)槟Σ炼軣幔⑶冶憩F(xiàn)為熾熱飛跑的光一区二区三区中文字幕丘咲，被稱為流星(meteor或者 shooting star)最近更新202中文字幕视频。

Note the terms here: The speck of sand is a "meteoroid"-it does not become a "meteor" until it is hot and glowing in the Earth's atmosphere.

要注意欧美成人h版在线观看，流星體meteoroid 只有在大氣層中發(fā)熱并發(fā)光的情況下才能被稱為流星meteor 欧美午夜伦费电影在线观看，如果一個(gè)小的巖石物體落到地面，只能被稱為隕石meteorite 亚洲性爱一级。

Perseid meteor shower is an annual fixed July 17 to August 24 during that time, it is not only quantity, but almost never in the absence of the Star in the summer before, is the most suitable non-professional meteor observers of the meteor shower, status column throughout the year the first three periodic meteor showers.

英仙座流星雨每年固定在7月17日到8月24日這段時(shí)間出現(xiàn)欧美性爱在线播，它不但數(shù)量多，而且?guī)缀鯊膩頉]有在夏季星空中缺席過另类亚洲精品网站av，是最適合非專業(yè)流星觀測(cè)者的流星雨99久久久无码国产精片，地位列全年三大周期性流星雨之首。

The Quadrantid meteor shower and the meteor speed during the period of this meteor shower are successfully observed using the Wuhan meteor radar for the first time, and then the correlative questions of observing meteor shower using the all-sky meteor radar are also discussed.

利用武漢流星雷達(dá)欧美黄频免费a，首次成功地觀測(cè)了象限儀座流星雨及流星雨期間的流星速度超碰黄色在线看，討論了利用單站全天空流星雷達(dá)觀測(cè)流星雨的相關(guān)問題。

The observational result shows that this Quadrantid meteor shower occurs between 0000 to 0800 local time in January 4, 2004, with meteor echoes peaking at 0400 local time. Moreover the meteor shower radiant derived from the meteor echoes plane, which is formed by the whole meteor echoes observed by the meteor radar during this shower, accords well with the theoretic radiant of this meteor shower.

從觀測(cè)結(jié)果可以發(fā)現(xiàn)此次象限儀座流星雨發(fā)生在2004年1月4日的0000-0800LT影音先锋综合网站，其中流星峰值出現(xiàn)在0400LT亚洲精选午夜久久无码6O80，而且通過流星雷達(dá)觀測(cè)到的流星雨期間的流星回波平面推測(cè)得到的流星雨輻射點(diǎn)也與該流星雨的理論輻射點(diǎn)位置對(duì)應(yīng)非常好。

Mobile phone company Meteor has apologised for causing offence with a Christmas television advertisement campaign which critics branded as ageist.

手機(jī)公司Meteor對(duì)因被觀眾指責(zé)為年齡歧視的一個(gè)圣誕節(jié)電視促銷廣告造成的傷害表示道歉日韩美女自拍视频宅男。

Meteor including single meteor, and the meteor shower of meteors fire are larger than mung bean of the meteoroid enters the atmosphere will be a visible brightness of the meteor.

流星包括單個(gè)流星日韩影音先锋av资源站、火流星和流星雨三種，比綠豆大一點(diǎn)的流星體進(jìn)入大氣層就能形成肉眼可見亮度的流星。