最佳门限 meaning in Chinese
optimum threshold
Examples
- This paper deduces the optimum threshold expression under certain cost rule and relationship between the number of pulse accumulation and the increased ratio of echo ' s snr
本文推导了最佳门限电平的表达式和脉冲积累对回波信号信噪比的改善能力。 - Abstract : based on weapon locating radar , this paper discusses detection performances of its sequential detection system in detail firstly . optimal method is applied to obtain its optimum threshold and criteria
文摘:以某型炮位侦察校射雷达为实际工程背景，详细讨论了其序列检测系统的检测性能，并应用最优化方法得出其最佳门限和最佳判定准则。 - Secondly , comparing with the algorithm that was given by english scholars a . k . nandi and e . e . azzouz in 1995 , this dissertation presents a modified automatic recognition algorithm of six kind of digital modulation types such as 2ask , 4ask , 2psk , 4psk , 2fsk and 4fsk , which only uses four key features , and has a very great exaltation in the rate of correct recognition and the performance of signal to noise , we puts forward the constitution of the best threshold which is applicable to the signal that changes within the scope of the signal to noise rate ( snr ) from 5db to 30db , and the overall success rate is not lower than 92 % when snr is over 7db
其次,针对1995年英国学者a . k . nandi和e . e . azzouz提出的针对2ask 、 4ask 、 2psk 、 4psk 、 2fsk和4fsk这六种常用的数字调制信号识别的算法,提出了一种数字信号调制方式识别算法( dmra )的改进算法。该算法仅利用四个特征参数,就可以识别这六种调制方式,而且在调制识别率和信噪比性能上都有了很大的提高,能够在信噪比不低于7db时,对实际信号的识别正确率高于92 % 。并且提出了最佳门限的设置方法,设置的门限适用于信噪比在5db ~ 30db范围内变化的信号。 - There are two ways to enhance the radar ' s detection performance : ( 1 ) for certain signal to noise ratio , choose a optimum detection threshold , whose false decisions producing minimum cost under the preset cost rules ; ( 2 ) basically reduce the false decision probability by increasing echo ' s snr
雷达在噪声背景中检测信号是一个概率问题，提高雷达的检测能力可归结为如下两个途径： （ 1 ）在信噪比一定的情况下，选择一最佳门限，使其在一定风险准则下错误判决产生的“代价”最小。 （ 2 ）提高回波信号的信噪比，从根本上减小错误判决的概率。