小型化高精度导航模拟器关键技术优化设计

Optimized Design of Key Technologies for Miniaturized and High Precision Navigation Simulator

摘要:

近年随着航天器工程的发展，GNSS导航模拟器外场应用增加，小型化高精度导航模拟器需求日渐突出。目前市场主流产品通过射频模块实现中频至L波段上变频，其射频模块体积大且定制性强，配置灵活性低；在此背景下提出了上变频优化设计，以北斗三号（B1C、B2a）导航信号为例，利用高速数模转换器特性，通过内插滤波、多相数控振荡器（NCO）及高速并串转换等关键技术将频谱搬移至特定频率，实现导航模拟信号生成。通过对设备性能指标自测试及与Spirent导航模拟器定位精度对比，表明自研模拟器可以给用户终端提供高质量高可靠性的导航模拟信号，且与传统方案相比结构更优、成本更低，性能更稳定，配置更灵活。

Abstract:

In recent years, with the development of spacecraft engineering, the application of GNSS navigation simulator field has increased, and the demand for miniaturized high-precision simulators has become increasingly prominent. At present, the mainstream navigation simulator in the market realizes the signal output from intermediate frequency to L-band through the RF module, and its RF module is large in size, highly customizable, and has low configuration flexibility. In this context, an upconversion optimization design is proposed, Taking the BD3 (B1C, B2a) navigation signal as an example, Utilizing RF A/D converter performance characteristics, used to move the spectrum to the corresponding specific frequency through key technologies such as interpolation filtering, multi-phase numerical control oscillator (NCO) and high-speed parallel series conversion, so as to realize the generation of navigation analog signal. Through the test of equipment performance indicators and the comparison of positioning accuracy with Spirent navigation simulator, it is shown that the self-developed simulator can provide high-quality and high-reliability navigation simulation signals to user terminals, and compared with traditional solutions, it has better structure, lower cost, more stable performance and more flexible configuration.