Page 544 - Fundamentals of Radar Signal Processing
P. 544
CHAPTER 7
Measurements and Tracking
It has been seen in earlier chapters that resolution in range, angle, and Doppler
shift is determined by the temporal and spatial bandwidth and the waveform
duration of the radar; but what about the precision of location in these
dimensions? To clarify the question, consider the notional output from the radar
receiver for a given range bin as a radar system scans in angle past a single,
isolated point target. Assume a high pulse repetition frequency relative to the
antenna scan rate so that the angle samples are closely spaced. In the absence of
noise, one would expect to measure an output voltage proportional to the two-
way antenna voltage pattern, as illustrated in Fig. 7.1a for a sinc-squared two-
way voltage pattern and a linear detector. The angular position of the target can
be determined exactly simply by finding the angle at which the peak output
voltage occurs. Thus, the target is located in angle to a precision much better
than the resolution.
