Presentation Information
[B-1C-36]Beamforming-Oriented Requirements for Two-Tone Two-Way Ranging in Distributed Satellite Systems
◎Yuxuan Ding1, Minseok Kim1, Shutai Okamura2, Sumio Morioka2,3 (1. Niigata Univ., 2. Interstellar Technologies Inc., 3. The Univ. of Osaka)
Keywords:
Distributed satellite system,Coherent beamforming,Carrier-phase ranging,Beamforming efficiency
Coherent distributed satellite systems require accurate master-slave range estimates to compensate propagation-induced carrier phase offsets before joint beamforming. This paper derives beamforming-oriented requirements for two-tone two-way ranging (TTTWR) in a single-master distributed satellite system. The residual ranging error is decomposed into sub-cycle fine-phase noise and integer-cycle wrap errors. The former gives a Ruze-type beamforming efficiency loss, whereas the latter causes decorrelation when the noisy synthetic-wavelength coarse range selects the wrong carrier-phase cycle. Based on this separation, closed-form expressions are obtained for the beamforming efficiency. Monte-Carlo simulations with 1000 slave satellites validate the model and show that the SNR requirement is usually dominated by wrap reliability rather than fine-ranging precision. Within the deterministic unambiguous region, increasing the two-tone spacing reduces the SNR required to achieve a target beamforming efficiency.