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US 4,047,171 AGranted
Transponder
AssigneeMotorola, Inc.
InventorBrian Blair Fugit
Life of this patent
Estimating the term…
Abstract
A radar transponder which transmits a frequency coherent coded reply for each interrogation pulse it receives within a broad frequency. The transponder comprises means for receiving an incoming signal pulse; means for converting the incoming pulse into a coded series of delayed pulses that are frequency synchronized with the incoming pulse; and means for transmitting the coded series of delayed pulses.
Claims10
A frequency agile transponder, comprising:
- means for receiving a relatively narrow interrogating signal pulse of a particular frequency falling within a given frequency band, and
- means responsive to said interrogating signal pulse for transmitting a coded series of reply pulses that are frequency synchronized with said interrogating signal pulse, said responsive means including frequency memory means for receiving a frequency coherent pulse indicative of the interrogating signal pulse and converting the frequency coherent pulse to a coded series of frequency coherent pulses, said frequency memory means being phase coded to prevent envelope cancellation in the series of pulses.
A frequency agile transponder comprising:
- means for receiving a relatively narrow segment of an interrogating signal pulse, the pulse having a frequency falling within a given frequency band;
- frequency memory means responsive to said segment for transmitting a series of variously delayed segments substantially similar to the received segment;
- and
- means coupled to said frequency memory means for augmenting the phase shift produced by the time delay of any transmitted segment by a phase angle substantially independent of frequency, said augmenting phase angle being chosen for each segment to enhance the peak response of a receiver responsive to signals in a band including the segment frequency, which band is narrow relative to the given frequency band and to the inverse of the segment duration.
1 more element
Dependencies are inferred from the claim text.