一种基于补偿算法的星载数字频率模块设计和实现  

The Implementation of Space-born Numerically Frequency Module Based on Compensation Algorithm

作　　者：张弓[1] 潘宇倩[1] 杨聪伟[1] 

机构地区：[1]北京空间飞行器总体设计部,北京100094

出　　处：《空间电子技术》2015年第5期23-27,共5页Space Electronic Technology

摘　　要：随着软件无线电技术在卫星中的应用,数控振荡器(NCO)逐渐代替传统的压控振荡器(VCO),广泛地应用于卫星中信号源的产生、数字上变频、数字下变频、载波的产生等。因此,实现高精度、高速的数控振荡器对星载数字基带意义重大。针对以上情况,文章提出了一种高速高精度星载数字振荡器的设计和实现。一方面,采用流水线结构满足高速的数据处理的需求;另外一方面,采用级数近似、迭代残余角度误差补偿等措施补偿传统CORDIC算法在精度方面的不足,并引入抖动模块改善角度周期性截断误差所引起的杂散,进一步提高了数控振荡器的精度。With software defined radio widely applied in satellites, Space-borne numerically controlled oscillator （NCO） , instead of voltage-controlled oscillator, has been gradually used in signal generation, digital up conversion, digital down conversion, carrier generation and so on. Therefore, it is of significance for space-borne digital base band to achieve high speed and precision numerically frequency module. According to the above situation, this paper presents the design and implementation of an improved numerically frequency module for space-bome application. The proposed method employs the pipelined structure to implement the high-speed numerically frequency module. Meanwhile, a second-order approximation compensation component is appended to improve CORDIC algorithm shortage in precision. Additionally, an additive random signal, called dither compensation ,is added to interrupt the periodicity of the phase truncation error.

关 键 词：软件无线电 数控振荡器 实现 抖动 

分 类 号：TN713.7[电子电信—电路与系统]