lpi 中文意思是什麼
lpi
解釋
每英寸行數-
Quick and accurate acquest of signal is critical for the utility of an lpi radar
準確、快速的擴頻碼同步是編碼lpi雷達系統實用的前提。 -
The realization of quick acquest under very low snr and big frequency shift is one of the key problems of lpi radar. we designed a new receiver which needs less computation spend without any decline of the performance of the radar
如何在較低輸入信噪比和較大頻偏的條件下實現擴頻碼快速捕獲是碼同步的難點，本文在不損失系統性能的基礎上，設計了一種結構簡單的接收機實現方案。 -
It was found that they were fit for the lpi applications. on the digital signal processing, we studied the demand on compute ability for fast acquest. we designed a new signal form named ds - fh - th signal which costs less in processing but without any lost on the lpi performance
在信號的數字處理方面，分析了直接序列擴頻雷達在信號捕獲階段對計算能力的要求，在不降低系統lpi性能的基礎上，設計了ds - fh - th雷達信號，降低系統對計算能力的要求。 -
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，低截獲概率及組網能力，因此跳頻技術的一出現，便在軍事領域得到了極大的發展，採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。 -
Nowadays, the application of electronic support measure ( esm ) receivers, radar warning receivers ( rwr ) and especially arm forms a serious menace to radar ' s existence and the low probability of interception ( lpi ) radar just appears under this circumstance. lpi radar attempts to use various techniques to make radar signal not be intercepted by intercept receivers
現代電子支援偵察（ esm ）接收機和雷達告警接收機（ rwr ）尤其是反輻射導彈（ arm ）的應用對雷達的生存構成了嚴重的威脅，低截獲概率雷達正是在這種環境下提出的一種新體制雷達，它試圖採用各種可能的技術來避免雷達信號被截獲接收機所截獲。 -
The lpi can identify a persons emotional orientation and locate a persons preferred behavioural orientations on any of the five behavioural dimensions as stated above
可以鑒別一個人的情緒傾向性及依據以上所說的五個性格因素確定一個人所選性格傾向。 -
The simulation results show that these hybrid signals are lpi radar signals
模擬表明組合脈壓信號是一類較好的低截獲概率雷達信號形式。 -
We created a directive rule for lpi signal design
提出了lpi雷達信號設計的指導性原則。 -
At the same time, we optimize the method by initializing the snmf with the spherical k - means and the nnls ( non - negative least squares ). by combination of snmf and the method lpi ( locality preserving indexing ), we get better performance in clustering accuracy
同時採用球形k -平均演算法和nnls （非負最小平方差）演算法的結果初始化snmf演算法以達到改進和優化snmf演算法的目的;通過結合snmf演算法與lp （ i局部保留索引）演算法以實現在無監督的方式下取得更準確聚類結果的演算法。 -
What is the purpose of the lpi ? the lpi is formulated based on the five factors model of human personality. it is anchored under the types traits theory of classical personality theories
是依據有關人類的性格五因素模式所成立的公程序，也是據于正統派系的性格理論之類型與特質理論而設計的。 -
We analyzed the anti - jam and band inside anti - interfere performance of the system, and the low probability intercept ( lpi ) of the traditional direct sequence spread spectrum ( dsss ) modulations in the uav platform ' s applications. so a new modulation technique using a multi - level pseudo noise ( pn ) code has been presented. the new multi - level pn code is built from a high speed pn code through a low passed filter ( lpf )
分析了系統抗阻塞式干擾和抗帶內頻帶干擾的性能，以及常規bpsk qpsk - dsss調制在無人機通信中存在的安全隱患，提出了一種用多電平pn碼進行擴頻調制的方法：採用高速pn碼，經過低通濾波器，產生多電平pn碼進行直序擴頻調制，能在低信噪比情況下有效抵抗平方率檢測器對系統載波的檢測。 -
The techniques of low probability of intercept ( lpt ) are developing rapidly, and are used widely in radar and communication. in order to counteract the lpi techniques, there is necessary to research the new methods of detection and estimation of lpi signals
目前低截獲概率（ lpi ）技術發展迅速，並在雷達和通信中獲得廣泛應用，為對抗這些技術帶來的檢測和估計問題，需要研究低截獲概率信號檢測和估計的新方法。 -
Lpi lines per inch
線每英寸 -
On the optical signal processing, we argumented the feasibility of optical processing for lpi radar application, then estimated the capability of optical signal processing under today ' s technology especially vlsi technology
在光學信號處理方面，論證了光學相關器在lpi雷達中應用的可能性，估計了在目前技術條件下光學相關器可能達到的性能。 -
User selectable line screens that include 106 lpi and 150 lpi
可供用戶選擇的線條網，包括106 lpi和150 lpi -
The low probability of intercept ( lpi ), the ability in super - resolution and anti - jamming of ultra - wide band radar challenge to the traditional receivers
超寬帶雷達具有低截獲性及抗偵察、抗干擾、抗摧毀等性能，對傳統的偵察體制提出了巨大的挑戰。 -
The main work of this dissertation can be summarized as follows. 1 、 the low probability of intercept ( lpi ) of uwb radar is analyzed based on the radar equation and reconnaissance equation. the necessity of making reconnaissance of uwb signal in the circumstance of low or negative snr is proved
本文主要工作如下: 1 、從超寬帶雷達方程和偵察方程出發，分析了超寬帶雷達信號的低截獲特性，證明了超寬帶雷達信號的偵察和參數估計在低信噪比條件下的必然性。 -
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 / vhf ( high frequency / very high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and ensure the safety and validity of chain of military command
跳頻技術是擴頻技術的一種，是80年代以來出現的一種新的通信方式。跳頻通信具有良好的抗干擾性，低截獲概率及組網能力，因此跳頻技術的一出現，便在軍事領域得到了極大的發展。採用跳頻技術的短波超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，保證了軍事指揮系統的安全和有效性。 -
With multi - modulation, the disadvantages of single - modulation ( such as fsk, psk and ppm ) can be eliminated. by taking the advantages of different modulations, the performance of range resolving, doppler resolving and low probability of intercept ( lpi ) of the signal can be improved
復合調制信號可以克服單一信號調制形式（如fsk 、 psk 、 ppm等）的缺點，實現信號之間的取長補短，提高距離、速度分辨力，提高信號的低截獲概率（ lpi ）性能，是雷達理論與技術的發展方向。 -
With adopting spectrum - spread technology to the lpi radar, the radar has an excellent ability of lpi and counter electronic countermeasures of electric interference
將擴頻技術應用在低截獲概率雷達上，可以提高雷達的抗干擾性能和測量精度。
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