This paper describes a method of obtaining precise Doppler measurements of the velocity of a spacecraft without the use of a coherent transponder. Transceiver systems in which the uplink and downlink carriers are not phase locked have the advantage of being simpler and offering a wider range of design and packaging options than transponder systems. The disadvantage of a simple transceiver approach is that the downlink carrier frequency observed by a ground station is dependent upon the spacecraft frequency reference as well as on the Doppler velocity. A method of removing the effects of drift in the spacecraft frequency reference from the Doppler measurement has been developed and successfully tested in the laboratory and at the NASA Deep Space Network Test Facility. This paper will describe the two-way, noncoherent navigation method, its advantages for future spacecraft design, and a simplified error analysis. Transponder-level Doppler precision of 0.1 mm/s over a 60-second interval is supported. The impact of such a system on the normal methods of sequential tone ranging and the application of the method for spin stabilized spacecraft are also described.
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机译：本文介绍了一种无需使用相干应答器即可获得航天器速度的精确多普勒测量结果的方法。与应答器系统相比，其中上行链路和下行链路载波未锁相的收发器系统具有更简单的优势，并提供了更广泛的设计和封装选择。简单的收发器方法的缺点在于，地面站观测到的下行链路载波频率取决于航天器频率参考以及多普勒速度。已经开发了一种从多普勒测量中消除航天器频率参考中的漂移影响的方法，并已在实验室和NASA深空网络测试设施中成功进行了测试。本文将介绍双向非相干导航方法，其在未来航天器设计中的优势以及简化的误差分析。支持60秒间隔内0.1 mm / s的应答器级多普勒精度。还介绍了这种系统对连续音调测距的常规方法的影响以及该方法在自旋稳定航天器上的应用。
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