pn ( pseudo-noise ) 中文意思是什麼
pn ( pseudo-noise )
解釋
偽噪聲-
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。 -
Pn pseudo noise
偽隨機噪聲 -
However, the traditional spreading codes are usually deterministic pseudo - noise ( pn ) codes, which can be duplicated, potentially compromising the transmission security. then the time varying and random spreading codes are expected
為了提高擴頻通信系統的抗干擾性、降低信號被截獲的概率，我們希望擴頻碼是隨機的、動態變化的。 -
Traditional spread spectrum communication adopts pseudo - noise ( pn ) codes as spreading codes. however, pn sequence is fixed and periodic, which threatens the transmission security. self - encoded spread spectrum ( sess ) employs random spreading sequences that are extracted from the random information data, abandoning the fixed sequence
傳統的擴頻通信廣泛採用偽噪聲（ pseudo - noise ， pn ）序列作為擴頻序列， pn序列具有類噪聲特性，但它實際上是確定的周期序列，容易被復制。 -
With the development of the electron and information technology, the blind de - spread of spread spectrum signals in non - cooperation communication has been a research hot spot. the blind detection and estimation of the chip rate and period of pseudo noise ( pn ) sequence are the precondition for the realization of blind de - spread
隨著電子戰和信息戰技術的發展，非合作通信條件下擴頻信號盲解擴成為擴頻通信領域的研究熱點，擴頻信號pn碼速率和碼周期的盲檢測和盲估計是實現盲解擴的前提。 -
We propose a new method of calculating the best threshold according to the characteristic of pn ( pseudo noise ) code
根據偽隨機碼的特性，提出了一種新的求取最佳檢測門限的方法。
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