The rule of thumb that seems to be common among my peers is that monopulse offers an angle accuracy improvement of roughly 10 to 1 for objects with nominal SNR (13ish dB).
So a radar with a real beam width of 1deg employing monopulse would result in an accuracy of 0.1deg if the object can be reliably detected.
Interesting. I've been out of this field for 20 years, and the hundredths of a degree came from my fuzzy memory. Happy to defer to your more recent knowledge.
So a radar with a real beam width of 1deg employing monopulse would result in an accuracy of 0.1deg if the object can be reliably detected.