former n. 1.構(gòu)成者,創(chuàng)造者。 2.【機(jī)械工程】模型,樣板,成形[型]設(shè)備。 3.【無(wú)線(xiàn)電】線(xiàn)圈架。 4.〔英國(guó)〕公學(xué)及其他中等學(xué)校的學(xué)生。 fifth formers 五年級(jí)學(xué)生。 adj. 1.以前的,從前的。 2.在前的;〔美國(guó)〕前任的。 in former times 從前。 in the former case 在前一例[情況]。 the former 前者 (opp. latter)。 adv. -ly
beam n. 1.梁,棟梁,桁條;(船的)橫梁。 2.船幅;(動(dòng)物、人的)體幅。 3.(秤)桿,杠桿,(織機(jī)的)卷軸,經(jīng)軸;(鹿角的)主干;車(chē)轅;犁柄;鋤把。 4.(光線(xiàn)的)束,道,柱;【物理學(xué)】波束,射束。 5.(笑容、表情等的)煥現(xiàn)。 6.【無(wú)線(xiàn)電】有效播聽(tīng)范圍。 7.【航空】信號(hào)電波,指向電波。 a beam of light 一束光線(xiàn)。 the common beam 標(biāo)準(zhǔn)秤;準(zhǔn)則。 beam and scales 天平。 a beam of delight 高興的表情,笑逐顏開(kāi)。 an erector beam 【火箭】(發(fā)射時(shí)調(diào)整導(dǎo)彈位置的)千斤頂。 radio beam 無(wú)線(xiàn)電領(lǐng)航信號(hào)。 a landing beam 【航空】降落指示波。 abaft the beam = before the beam. a beam in one's eye 自己本身的大缺點(diǎn)〔與他人目中之刺相比,自己眼中有梁,源出《圣經(jīng)》馬太福音〕。 before the beam 【航?!空龣M前。 broad in the beam 〔口語(yǔ)〕臀部闊大。 fly the beam 【航空】按指向電波飛行。 fly the wet beam 【航空】順著河流飛行。 kick [strike] the beam 1. (秤一方)翹起;過(guò)輕,不足抗衡,無(wú)足輕重。 2. 輸,遭受失敗。 off the beam 脫離航向,不順利;不對(duì)頭;做錯(cuò)。 on the beam 1. 【航?!颗c龍骨垂直地,正橫地。 2. 在航向上;對(duì)頭,做對(duì)。 on the port [larboard] beam 【航海】左舷正橫前。 on the starboard beam 【航海】右舷正橫前。 on the weather beam 【航?!坑龣M風(fēng)。 ride the beam = fly the beam. vi. 1.輻射,發(fā)光,閃光。 2.微笑,眉開(kāi)眼笑。 vt. 1.發(fā)射(光線(xiàn)、電波)。 2.向…放[播]送。 3.(用雷達(dá))探測(cè)。 4.(用波束)導(dǎo)航(飛機(jī)等)。 beam the program at America 向美國(guó)播送節(jié)目。 the sun beaming overhead 紅日當(dāng)頭照。 beam upon 看著…微笑。 beam with joy 眉飛色舞,笑逐顏開(kāi)。
The constant beam - width beam - former and wideband doa estimation algorithms are realized in the dsp hardware systems 完成了恒定束寬波束形成以及寬帶源方位估計(jì)算法在dsp硬件系統(tǒng)中的實(shí)現(xiàn)。
Here a scheme to implement broad - band constant beamwidth digital beam - former has been presented . the results of computer simulation show the scheme is effective 本文給出了一種寬帶恒定束寬數(shù)字波束形成器的實(shí)現(xiàn)方案,計(jì)算機(jī)仿真結(jié)果表明了該方案的有效性。
Aiming at the practical applications on engineering , the dissertation studies the theories and application technologies of constant beam - width beam - former and doa estimation for wideband signals . the main results and achievements are summarized as follows : 1 論文從實(shí)際工程應(yīng)用的角度出發(fā),系統(tǒng)研究了恒定束寬波束形成和寬帶高分辨陣列信號(hào)處理的相關(guān)理論和實(shí)現(xiàn)技術(shù),主要研究?jī)?nèi)容包括: 1
The work presented in this paper is carrying out to the theory research of dbf . the work includes : research of dbf algorithms , dbf antenna system composition and realization . the application of dbf algorithms used in high frequency ground wave radar for near ocean inspection and ocean situation remote sensor is also presented . at last , we give a effective scheme to implement broad - band constant beamwidth digital beam - former 本文的主要工作是圍繞數(shù)字波束形成技術(shù)的理論研究,內(nèi)容包括:數(shù)字波束形成算法的研究,數(shù)字波束形成天線(xiàn)的系統(tǒng)構(gòu)成和實(shí)現(xiàn),以及將數(shù)字波束形成算法應(yīng)用于高頻地波雷達(dá)近海監(jiān)測(cè)和海態(tài)遙感,最后給出了一種寬帶恒定束寬數(shù)字波束形成器的設(shè)計(jì)方案。
2 . the two thoughts of designing constant beam - width beam - former are studied , and the least square method and spatial resample method to calculate the weighting coefficients of the array elements are analyzed and compared , and the constant beam - width beam - former is designed , both in frequency and time domains 研究了寬帶恒定束寬波束形成器的兩種設(shè)計(jì)思想,并重點(diǎn)分析了計(jì)算陣元權(quán)系數(shù)的最小二乘法和空間重采樣法,比較了二者的性能,分析了恒定束寬波束形成器的頻域和時(shí)域?qū)崿F(xiàn)原理。
The analysis of wideband signals will improve the resolution capability and accuracy of estimation , for more frequency components can be synthetically used . constant beam - width beam - former and direction of arrival of sources for wideband signals are the important parts of wideband array signal processing 高分辨算法最初都是在窄帶信號(hào)的假設(shè)條件下提出的,由于寬帶信號(hào)含有更豐富的信息,有利于目標(biāo)檢測(cè)、參量估計(jì)和目標(biāo)特征提取,因此,對(duì)于寬帶信號(hào)處理的研究越來(lái)越多。