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The design and experimental implementation of a waveform for high-accuracyinter-node ranging in a coherent distributed antenna array is presented. Basedon a spectrally-sparse high-accuracy ranging waveform, the presentedmulti-frequency waveform enables high-accuracy ranging between multiple nodesin an array simultaneously, without interference. The waveform is based on aunique time-frequency duplexing approach combining a stepped-frequency waveformwith different step cycles per node pair. The waveform also inherently includesbeneficial disambiguation properties. The ambiguity function of the waveform isderived, and theoretical bounds on the ranging accuracy are obtained.Measurements were conducted in software-defined radio-based nodes in athree-element distributed array, demonstrating high-accuracy unambiguousranging between two slave nodes and one master node.

High-Accuracy Multi-Node Ranging For Coherent Distributed Antenna Arrays