UWB：IEEE 802.15.4 几个容易搞混的概念和名词：PRF，高带宽，499.2MHz，2ns； HRP，LRP；PSR，高带宽的优点和限制条件

UWB：几个容易搞混的概念和名词

Fundamentals of Time and Frequency (nist.gov)

Time and frequency standards supply three basic types of information: time-of-day, time interval, and frequency.

time-of-day

Time-of-day information is provided in hours, minutes, and seconds, but often also includes the date (month, day, and year). A device that displays or records time-of-day information is called a clock. If a clock is used to label when an event happened, this label is sometimes called a time tag or time stamp. Date and time-of-day can also be used to ensure that events are synchronized同步的