This article describes the current limiting error source for Delta Differential One-way Range (ΔDOR), provides a means to reduce this error, and lists the benefits to deep space navigation. Particular advantages for Small Satellite class missions are addressed. The key idea is spreading the spacecraft DOR signal with a pseudonoise (PN) code to make the spacecraft signal spectrum closely resemble the spectrum of natural radio sources used for instrument calibration. How spectral differences affect the measurement are discussed. This article describes the general formulation for PN DOR signal design, and the specific X-band implementation of PN DOR on a software defined radio at JPL. Finally, a prototype implementation at Ka-band, providing even better performance, is presented.

中文翻译：

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差分单向范围的改进信号

本文介绍了 Delta 差分单向测距 (ΔDOR) 的限流误差源，提供了一种减少这种误差的方法，并列出了深空导航的好处。解决了小型卫星级任务的特殊优势。关键思想是用伪噪声 (PN) 码传播航天器 DOR 信号，使航天器信号频谱与用于仪器校准的自然无线电源的频谱非常相似。讨论了光谱差异如何影响测量。本文描述了 PN DOR 信号设计的一般公式，以及 PN DOR 在 JPL 软件定义无线电上的特定 X 波段实现。最后，介绍了 Ka 波段的原型实现，提供了更好的性能。