Since the flight test data are of time domain, it needs to be converted into frequency domain by FFT method. Then it can be used to identify the system.
由于飞行试验数据是时域数据，使用这种方法需要使用FFT的方法将实测的时域数据转换成频域数据后再进行辨识。
Since the day of Heidi's attempted flight a great change had come over the child.
自从海蒂试图逃跑的那天起，这个孩子发生了很大的变化。
Since a number of people don't take the flight they book anyway, this makes sense.
鉴于很多人没能搭乘所预订的航班，上述就有了意义。
The mission is NASA's 132nd space shuttle flight since the fleet began launching into space in April 1981.
自1981年4月首次进入太空以来，本次任务是NASA航天飞机的第132次太空飞行。
Rescue teams from Brazil and France have been scouring a remote area of the Atlantic since the Air France flight carrying 228 people disappeared as it travelled between Rio DE Janeiro and Paris.
自从法航一架载有228名乘客的航班飞机在从里约热内卢飞往巴黎的途中失踪以来，巴西和法国的救援队已在大西洋的一个偏远地区展开全面搜寻。
Finally, of course, there's the question that's dogged every manned flight since the Soviet Union's Yuri Gagarin first went into orbit in 1961: Why bother?
当然最后有一个问题自从1961年苏联的尤里·加加林进入太空以来就一直困扰这我们：“为什么要为登月计划而操心”？
The Soyuz is the only way to get astronauts to and from the space station, ever since Atlantis returned from the final shuttle flight in July.
自从七月份“亚特兰蒂斯”号结束最后一次太空飞行返回地球后，“联盟号”就成为了运送宇航员往返太空站的唯一途径。
"Since the concept of our helicopter came from Italy, I always wanted to take a flight in the birthplace of da Vinci," Yanagisawa said.
他说：“因为直升机的理念源自意大利，所以我一直想在达·芬奇的出生地飞一次。”
Four top-flight matches are off today and one tomorrow, making this the most weather-disrupted weekend since the division was born in 1992.
四场顶级赛事中的三场于今日被取消，其余的一场将会在明天被取消，这成为了自1992年英超联赛诞生以来受天气影响最为严重的比赛日。
A plane operated by France's Aigle Azur landed in Baghdad Sunday, becoming the first flight from a European airline to arrive in the city since a 1990 international embargo on Iraq, AFP reported.
据法新社报道，一架隶属于法国蓝鹰航空公司的客机10月31日抵达伊拉克首都巴格达，成为自1990年对伊施行国际禁运以来首架到达伊拉克的欧洲航空客机。
The Baggies are unbeaten in five, their best ever run without loss in the Premier League and best overall in the top flight since October 1983.
灯笼裤五轮不败，这是他们英超联赛中最好的不败纪录，也是自1983年10月以来最好的顶级联赛成绩。
Today, a year since Krywko’s decision to go against the offshoring tide, Sleek Audio has a full-scale manufacturing operation that can be reached via a 15-minute car ride rather than a 24-hour flight.
今天，在Krywko做出回到国内的决定一年之后，SleekAudio有了一个离家只有15分钟车程，而不是24小时飞机的完整规模的生产经营。
The mission is the first successful flight of a Progress ship since an accident in late August destroyed the uncrewed Progress 44 vessel temporarily grounding Russia's Soyuz rockets.
自从8月底“前进”44号无人飞船出事故损毁之后，这是“前进”号飞船的首次成功之航。 那次事故一时将“联盟”号运载火箭搁置起来。
In the two years since, however, funding has been forthcoming and design work has begun, with aerodynamic testing on scale models under way at the Marshall Space Flight Center in Huntsville, Ala.
然而，自那时起两年内，在阿拉巴马州汉斯·维尔的马歇尔航天飞行中心，资金已经到位，而且设计工作已经开始，同时缩尺模型空气动力测试也在进行中。
Charters are especially popular with groups on vacation since they usually cost much less than scheduled flight on the same routes.
由于包机通常比定期航班在相同航线便宜，因而特别受度假的团体的欢迎。
But since late last year, a flight to safe assets by global investors has reversed the yen's direction.
然而自去年年底以来，全球投资人纷纷逃向安全资产，反转了日元的走势。
The Lancashire club have not been in the top flight since 1961 but Ferguson is determined to end that run.
这家兰开夏球队1961年之后就再没打过顶级联赛，但弗格森决心终结这段历史。
Since the computer failure, Russian flight controllers say they have had only partial communication with computers that control the space station's navigation and life support systems.
电脑出现问题后，俄罗斯航天飞行控制人员说，他们只能部分控制国际太空站的导航以及维持生命的电脑。
He became interested in flying ever since he took his first flight at the age of six.
自他六岁时第一次飞行以来，他对飞行产生了兴趣。
The analysis of the intercept window for ballistic missile midcourse defense is put forward based on the two-body theory, since the midcourse flight of a ballistic missile is nearly a two-body motion.
根据弹道导弹中段飞行近似为二体运动的特点，应用二体运动理论分析了弹道导弹中段防御的拦截窗口。
The day of the launch was "Discovery" in service since August 1984 the 39th flight, is also planned last time.
当天的发射是“发现”号1984年8月服役以来的第39次飞行，也是计划中的最后一次。
"We want to take advantage of the autorotation mode since it doesn't require power for flight," he said. "If we can find a vertical column of air, it can stay aloft indefinitely."
“因为它不需要飞行的电力，我们希望能发挥自旋模式的优点，”他说，“如果我们可以找到竖直而行的空气，它可以永远停留在空中。”
Transfixed by images of the ash cloud on a new visualisation system created for the purpose since Eyjafjallajokull's eruption, they set up a "crisis cell" and sent out changes to flight plans.
自从艾雅法拉火山爆发后，一种新的可视化系统应运而生。航空界被该系统上火山灰云的图像震撼，建立了“危机单元”并变更飞行计划。
Since most of the foreign trips are long-range flight, "the entire flight crew is divided into two groups and on duty alternatively, " he said.
由于大多数出访都是长途飞行，鲁培新介绍说，“机组成员分为两班，一班值勤，另一班则休息。”
Since most of the foreign trips are long-range flight, "the entire flight crew is divided into two groups and on duty alternatively, " he said.
由于大多数出访都是长途飞行，鲁培新介绍说，“机组成员分为两班，一班值勤，另一班则休息。”
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