Method for extension of unambiguous range and velocity of a...

Details Method for extension of unambiguous range and velocity of a... Method for extension of unambiguous range and velocity of a...

2008-06-03

2009-10-20

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Radar for meteorological use

C342S02600R, C342S02600R, C342S02600R, C342S02600R, C342S112000, C342S159000, C342S127000, C342S128000, C342S129000, C342S137000

Reexamination Certificate

active

07605744

ABSTRACT:
A method for extension of unambiguous range and velocity of a weather radar. To avoid pulse overlaying, the pulse repetition time of a single pulse can be extended such that any return echo will arrive at the radar before the next pulse is transmitted. When pulse repetition time is increased, the maximum unambiguous range increases while the maximum unambiguous velocity decreases. The pulse overlaying can be avoided if consecutive pulses are sent on different frequencies that are far enough from each other to allow separation of pulses arriving simultaneously at the radar. When different frequencies are used an unknown phase difference is generated by distributed atmospheric targets to the return signals. This normally prevents use of the shorter pulse repetition time for velocity calculation.

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