ID 原文 译文
9864 针对L频段数字航空通信系统1(L-band digital aeronautical communications system 1,L-DACS1)中存在的载波偏置测距仪脉冲干扰信号,首先建立测距仪(distance measure equipment,DME)脉冲信号模型,证明了载波偏置测距仪信号是循环平稳信号; To 1 L band digital aviation communication system (L - band digital aeronautical communications system, 1 L - DACS1) existing in the carrier offset range finder pulse interference signal, the first to establish a rangefinder (short measure equipment, DME) pulse signal model, and prove that the carrier offset range finder signal are cycle stationary signal;
9865 随后理论分析并推导给出其循环自相关函数和循环谱的数学表示; Then the theoretical analysis and derivation is given its cyclic autocorrelation function and cyclic spectrum of mathematics;
9866 最后仿真验证了载波偏置测距仪信号具有循环平稳特性的正确性。 Finally, the simulation verifies the carrier offset range finder the correctness of the signal are characterized by their smooth circulation characteristics.
9867 以最大化码率为目标设计的无率编码通常能够实现逼近容量的性能,但是这种编码在译码时需要进行非常多次(理论上是无穷多次)的迭代才能达到预期的误比特率性能。 Designed to maximize the rate for the target rate coding can achieve usually approximation capacity performance, but the code need to be very many times when decoding (are theoretically infinite times) iteration to achieve the desired bit error can spontaneously.
9868 基于外部信息转移图的渐近收敛分析,提出一种在有限译码迭代次数约束下的非系统累积无率码编码度分布的优化设计方法,给出此优化问题的数学模型。 ‭Asymptotic convergence based on external information transfer diagram analysis, put forward a kind of system under the restriction of limited decoding iterations cumulative rate code coding optimization design method of degree distribution, the mathematical model of optimization problems are presented.
9869 通过求解该优化问题可得到满足要求的编码度分布函数。 ‭Is obtained by solving the optimization problem can be meet the requirements of coding degree distribution function.
9870 仿真结果表明,与以最大化码率为目标设计的编码相比,在有限的译码迭代次数下,所提出的方法设计的编码能获得更好的纠错性能,且译码迭代次数越小,性能优势越明显。 ‭The simulation results show that with the designed to maximize the bit rate for target code, compared to under the limited decoding iterations, the proposed design coding method can obtain better error correction performance, and decoding the smaller number of iterations, the more obvious performance advantage.
9871 针对空中运动目标参数的实时解算和定位精度问题,基于运动多站无源定位技术,设计了空基分布式定位系统,利用测向交叉定位原理建立了双机协同被动定位模型。 Real-time target parameters for air movement and positioning accuracy problem, based on the motion more station passive location technology, design the empty base distributed positioning system, using the principle of direction finding cross location double machine collaborative passive positioning model is established.
9872 模型中完成信息保障任务战斗机的存在使得目标定位误差迅速最小化。 The existence of the model in information security task fighter minimize the target positioning error quickly.
9873 通过动态规划法进行双机航迹控制算法设计。 Through the dynamic programming dual machine track control algorithm design.