Assume that the length of temporal subaperture
(also called time-smoothing factor) is M (M < K).
In conventional 1D array transducer, a subset of transducer elements or subaperture
is sequentially selected to send an acoustic beam perpendicularly to the transducer surface, and one line is drawn at the same time.
The D3-STAP does not require the training data at the cost of reduced subaperture
. The performance of D3-STAP declines because its system DOF decreases.
Prats, "First ENVISAT and ERS-2 parasitic bistatic fixed receiver SAR images processed with the subaperture
range-Doppler algorithm," IGARSS, 1840-1843, 2006.
To keep pace with ever more stringent accuracy requirements of modern optics manufacturing, QED Technologies, Rochester, N.Y., has developed the Subaperture
Stitching Interferometer for Aspheres (SSI-A), a six-axis, computer-controlled interferometric workstation that marks a first in the optics industry.
The MR fluid is delivered to the rotating wheel, pulled against the wheel's velocity and becomes a subaperture
Its unique optical design utilizes a subaperture
meniscus corrector lens in front of the secondary mirror to produce a large imaging field free from optical aberrations at f/11.5.
Because the speckles distribute randomly, they can be restrained by the non-coherent accumulation of multiple subaperture
The other way using a subaperture
approach [13, 14] is proposed, but the general section principle cannot be confirmed well.
Two methods are available to account for this problem, including the method of subaperture
 and the method of ANCS.
Compared to other solutions to overcome the aliased Doppler spectra, the use of subaperture
is a simple and efficient method.