Sutton Andrew, McKenzie Kirk, Ware Brent, Shaddock Daniel A
Center for Gravitational Physics, The Australian National University, ACT 0200 Australia.
Opt Express. 2010 Sep 27;18(20):20759-73. doi: 10.1364/OE.18.020759.
The Laser Interferometer Space Antenna (LISA) will use Time Delay Interferometry (TDI) to suppress the otherwise dominant laser frequency noise. The technique uses sub-sample interpolation of the recorded optical phase measurements to form a family of interferometric combinations immune to frequency noise. This paper reports on the development of a Pseudo-Random Noise laser ranging system used to measure the sub-sample interpolation time shifts required for TDI operation. The system also includes an optical communication capability that meets the 20 kbps LISA requirement. An experimental demonstration of an integrated LISA phase measurement and ranging system achieved a ≈ 0.19 m rms absolute range error with a 0.5Hz signal bandwidth, surpassing the 1 m rms LISA specification. The range measurement is limited by mutual interference between the ranging signals exchanged between spacecraft and the interaction of the ranging code with the phase measurement.
激光干涉空间天线（LISA）将使用时延干涉测量法（TDI）来抑制原本占主导地位的激光频率噪声。该技术利用记录的光学相位测量的子样本插值来形成一系列对频率噪声免疫的干涉组合。本文报道了一种用于测量TDI操作所需子样本插值时间偏移的伪随机噪声激光测距系统的开发情况。该系统还具备满足LISA 20 kbps要求的光通信能力。一个集成的LISA相位测量和测距系统的实验演示在0.5Hz信号带宽下实现了约0.19 m均方根绝对测距误差，超过了LISA规定的1 m均方根误差。测距测量受到航天器之间交换的测距信号相互干扰以及测距码与相位测量相互作用的限制。
