Properties:
The transmitted signal is (s(t) = \textrect(t/\tau) \cos(2\pi f_0 t + \pi \fracB\tau t^2)).
The pulse is divided into sub-pulses (chips), each with 0° or 180° phase according to a binary sequence (e.g., Barker code, Gold code). Bandwidth (B \approx 1/t_chip), time-bandwidth product equals the number of chips.
Radar signals are typically narrowband (relative to carrier frequency) and can be continuous or pulsed.