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High PRF is limited to systems that require close-in performance, like proximity fuses and law enforcement radar. For example, if 30 samples are taken during the quiescent phase between transmit pulses using a 30 kHz PRF, then true range can be determined to a maximum of 150 km using 1 microsecond samples (30 x C / 30,000 km/s).
The received signals from multiple PRF are compared using the range ambiguity resolution process. Each range sample is converted from time domain I/Q samples into frequency domain. Older systems use individual filters for frequency filtering.
It is said that the two indicators assume that "smart" money is traded on quiet days (low volume) and that the crowd trades on very active days. Therefore, the negative volume index picks out days when the volume is lower than on the previous day, and the positive index picks out days with a higher volume.
In the United States in 2009, high-frequency trading firms represented 2% of the approximately 20,000 firms operating today, but accounted for 73% of all equity orders volume. [citation needed] [28] The major U.S. high-frequency trading firms include Virtu Financial, Tower Research Capital, IMC, Tradebot, Akuna Capital and Citadel LLC. [29]
Low trading volume can also mean high volatility. With remaining traders opting to take some recently gained profits and stuff them in their pockets, momentum shifted as folks literally and ...
Radar designers try to use the highest PRF possible commensurate with the other factors that constrain it, as described below. There are two other facets related to PRF that the designer must weigh very carefully; the beamwidth characteristics of the antenna, and the required periodicity with which the radar must sweep the field of view.
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