A pulse may be divided into contiguous sequential frames, sometimes called sub-pulses. In a typical pulse-Doppler
radar, receiving echo energy must be deferred until after the entire pulse waveform is transmitted. This sets a nearest
possible range at which the beginning of the echo pulse can be processed. However, even when early frames or portions
of frames are occluded or eclipsed by the transmit pulse, the echo from later frames may still be received and processed.
This allows latter frames to be received in their entirety from nearer ranges than earlier frames or the entire pulse. As
long as the latter frames still exhibit the desired resolution bandwidth, no loss of resolution is suffered by processing
against only the latter frames. In this manner, a compound multi-frame pulse can be processed against a larger range
swath than a more conventional pulse modulation scheme. Essentially, the traditional constraints between near-range
detection and pulsewidth have been considerably loosened. Relative frame durations can be optimized to allow SNR to
exceed some minimum level.