Hi pingfang,
The Doppler Ambiguity can be solved in different ways and will be dependent on the radar system under development, this is the task of the customer to define the radar system.
In order to avoid Doppler ambiguities, radar systems require high pulse repetition frequency (PRF) rates when detecting high-speed targets. When a long-range radar is required to detect a high-speed target, it may not be possible to be both range and Doppler unambiguous. This problem can be resolved by using multiple PRFs. Multiple PRF schemes can be incorporated sequentially within each dwell interval (scan or integration frame) or the radar can use a single PRF in one scan and resolve ambiguity in the next. The latter technique, however, may have problems due to changing target dynamics from one scan to the next. The Doppler ambiguity problem is analogous to that of range ambiguity. Therefore, the same methodology can be used to resolve Doppler ambiguity.
Hopefully this helps direct your research.
Thanks,
Ewan
