An apparatus interfaces a commercial-off-the-shelf (COTS)/off-the-shelf (OTS) modem for pulsed data communication using existing sensor aperture among radar platforms. The apparatus includes a demodulator for receiving a sequence of first pulse signals, at least one first pulse signal of the sequence of first pulse signals being modulated with an input signal. The demodulator includes a pulse regeneration module for regenerating a pulse timing of the sequence of first pulse signals and a pulse demodulation module for demodulating the sequence of first pulse signals to recover the input signal in synchronization with the pulse timing of the sequence of first pulse signals.