在综合分析目前几种场强预测模型基础上，结合特定的地形地物，提出利用修正后的OM模型来进行场强预测。经实践验证，预测值与实测值比较接近，从而验证了模型的有效性。

对于脉冲和高斯加性混合噪声环境下正交空时分组码的性能进行了研究，建立了采用最大似然译码的混合噪声多发单收近似等效模型。利用矩母函数分析方法，推导出了Rayleigh衰落信道下空时分组码误符号率闭式表达式的渐近解。对采用M-PSK和M-QAM调制方式的不同空时分组编码方案在混合噪声环境下误符号率的性能进行了分析，蒙特卡洛仿真结果与解析性能结果吻合良好。

This paper presents the analysis of the performance of orthogonal space-time block coding (OSTBC) over fading channels with impulsive noise. We adopt anε -mixture Gaussian noise model for the noise distribution. Based on an equivalent scalar additive mixture noise channel with a channel gain proportional to the Frobenius norm of the matrix channel for OSTBC, we derive the closed-form expressions for the average symbol error rate (SER) of OSTBC over Rayleigh, Rician and Nakagami-m flat fading channels under the impulsive model. Furthermore, we evaluate the SER performance of the OSTBC for different code matrices with MPSK and MQAM modulations. Simulation results show fine agreement with the analyses.

We study the performance of space-time block coding in terms of different transmission matrices over Nakagami-m fading channels in multiple-input multipleoutput (MIMO) environments. A closed-form expression for the exact symbol error rate (SER) of orthogonal space-time block coding (OSTBC) over independent identically distributed Nakagami-m fading channels can be derived by means of the equivalent single-input single-output (SISO) model. The exact SERs of OSTBC with M-PSK and MQAM modulations are expressed in terms of the moment generating function (MGF) of instantaneous SNR as well as the higher transcendental functions. In this paper, we provide performance evaluation results of several codes of OSTBC with the closed-form expressions; also, Monte Carlo simulation results are given, which demonstrate the accuracy of closed-form solutions. In addition, some new observations on the performance results of different code matrices are made.

为了充分利用潮流信息，确保船舶航行安全性，缩短航行时间，节约燃料，提高船舶航行效率，提出了一种将潮流信息数字化的方法，给出了该方法的实现原理。利用此方法，可以迅速准确地获取指定海域的潮流信息。介绍了在此基础上实现的一种用于在内陆海等特定海域航行船舶航海计划制定的支援系统，并给出了具体实现的框图。利用该系统可以模拟预定航线的航行时间，从而可以确定最佳出航时间和航线。通过对某一特定海域内船舶航行时间的模拟实例，验证了该系统的有效性。