Page 336 - Fundamentals of Radar Signal Processing

FIGURE 5.5 Notional two-dimensional data matrix. Each cell is one complex
number.

FIGURE 5.6 MTI filtering and detection process.

The samples in each column are successive samples of the returns from a

single pulse, i.e., successive range bins. Each element of a column is one
complex number representing the real and imaginary (I and Q) components of
one range sample. Consequently, each row represents a series of measurements
from the same range bin over successive pulses. The sampling rate in the fast
time or range dimension (vertical column in Fig. 5.5) is at least equal to the
transmitted pulse bandwidth and therefore is on the order of hundreds of
kilohertz to tens or even hundreds of megahertz. The slow-time or pulse number

dimension (horizontal row in Fig. 5.5) is sampled at the pulse repetition interval
of the radar. Thus the sampling rate in this dimension is the PRF and is on the
order of ones to tens, and sometimes hundreds of kilohertz. As indicated by the
shading, Doppler filtering operates on rows of this matrix.
MTI processing applies a linear filter to the slow-time data sequence in