特高压线路干扰下无线电罗盘测角误差分析

特高压输电线路的电晕放电是机场无方向信标台的主要干扰源之一。根据无线电罗盘的工作原理，在特高压输电线路电晕干扰条件下，通过理论推导得出了无线电罗盘测得的电台相对方位角误差。针对无方向信标台不同频率、台站与输电线路间不同的距离，对无线电罗盘受干扰影响产生的测角误差进行了仿真分析。研究表明：电晕放电干扰下，机载无线电罗盘测得的电台相对方位角误差随距离的增加而增大，随频率的增加而减小，且变化趋势由陡峭逐步趋近平稳。

Thermal Design and Analysis for Missile borne Infrared Thermograph

Be restricted within the narrow space, missile borne infrared thermograph integrates the electrical，optical and mechanical components in limited space． The imaging quality of thermograph and detector capability will be affected by the heat dissipation of internal components and the external heat flux conducted by mechanical parts． Thermal design is needed to guarantee its normal work and high imaging quality in outer space． In this paper thermal design was taken according to the thermal environment and the structure characteristic of the thermograph. Passive control methods were used to extend the thermal time constant. The heat transfer model was built, and the simulation was taken based on the thermal control methods and the work condition. The analysis results showed that the temperature of thermograph was between 10℃~60℃, which met the thermal control index. Through the analysis, a warrant for reliability of thermograph and optimization of thermal design was provided.