例句與用法

1. By its super long life , hf ( high frequency ) electrodeless light establishes a separate sect in family of lights
   高頻無極燈以其6萬小時的超長壽命在照明家族獨樹一幟。
2. Othr ( over - the - horizon radar ) is a kind of hf ( high frequency ) radar with great expectation , which has arisen great concern worldwide because of its large coverage , anti - stealth character and so on
   超視距雷達( othr )是一種具有較大發(fā)展前景的高頻雷達，以其覆蓋距離遠、覆蓋面積大和抗隱身等優(yōu)良特點受到各國學者的廣泛關注。
3. In hf ( high frequency ) radar , the targets detected based on the spectrum processed by the two - dimension fft are peak - like , which makes the operator distinguish them from the clutter and background noise easiler in the 3d ( three - dimension ) display than the 2d
   特別對于距離分辨力低的高頻雷達系統(tǒng),其探測的目標通常近似為點目標,在經(jīng)二維傅立葉變換得到的頻譜數(shù)據(jù)上呈現(xiàn)峰狀結(jié)構(gòu)。
4. Frequency - hopping ( fh ) is a novel spread spectrum communication technique , which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences , the extensive application of hf ( high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and brought up a new austere challenge for communication countermeasures
   跳頻通信具有良好的抗干擾性，低截獲概率及組網(wǎng)能力，因此跳頻技術的一出現(xiàn)，便在軍事領域得到了極大的發(fā)展，采用跳頻技術的短波電臺在軍事通信中得到了廣泛應用，極大地提高了軍事裝備的抗截獲和抗干擾能力，向通信對抗提出了嚴峻的挑戰(zhàn)。
5. The technology of very low bit rate for hf ( high frequency ) communication means that , one technology of ecm ( electronic counter measures ) resistant communication is developed for low bit data message exchange in the time of battle which data communication is destroyed by electronic disturber . it is regarded by armies in the battle of information , because that it can overcome the very low snr ( signal noise ratio ) , very high narrow - band interference and multipath with maxium delay of fifty millisecond
   短波最低限度通信技術是在戰(zhàn)時強電磁干擾情況下能實現(xiàn)保證最低限度的數(shù)據(jù)報通信的一種抗干擾通信技術。由于其能有效的克服極低信噪比、較強的窄帶干擾和幾十毫秒的多徑，在信息戰(zhàn)中受到各軍高度重視。