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US 7,460,059 B1Granted
Removing interfering clutter associated with radar pulses that an airborne radar receives from a radar transponder
AssigneeSandia Corporation
InventorsRichard C. Ormesher, Robert M. Axline
Life of this patent
Estimating the term…
Abstract
Interfering clutter in radar pulses received by an airborne radar system from a radar transponder can be suppressed by developing a representation of the incoming echo-voltage time-series that permits the clutter associated with predetermined parts of the time-series to be estimated. These estimates can be used to estimate and suppress the clutter associated with other parts of the time-series.
Claims32
A pulsed radar reception method, comprising:
- receiving at a moving platform pulsed radar signaling activity including a plurality of information pulses respectively associated with a first plurality of intervals of active transmission by a radar transponder, said pulsed radar signaling activity further including a plurality of pulse samples respectively associated with a second plurality of intervals in which the radar transponder is inactive with respect to transmission, each of said information pulses having associated therewith a respectively corresponding one of said pulse samples that bears a predetermined temporal relationship relative to the information pulse;
- and
- for each of said information pulses, canceling interference associated with the information pulse based on the respectively corresponding pulse sample and the associated temporal relationship.
A pulsed radar receiver apparatus for operation on a moving platform, comprising:
- an input for receiving pulsed radar signaling activity including a plurality of information pulses respectively associated with a first plurality of intervals of active transmission by a radar transponder, said pulsed radar signaling activity further including a plurality of pulse samples respectively associated with a plurality of intervals in which the radar transponder is inactive with respect to transmission, each of said information pulses having associated therewith a respectively corresponding one of said pulse samples that bears a predetermined temporal relationship relative to said information pulse;
- and
- an interference cancellation unit coupled to said input, said interference cancellation unit operable with respect to each of said information pulses for canceling interference associated with the information pulse based on the respectively corresponding pulse sample and the associated temporal relationship.
A pulsed radar reception method, comprising:
- receiving at a moving platform a temporal sequence of radar pulses respectively associated with intervals of transmission by a radar transponder, said temporal sequence of radar pulses including a plurality of information pulses and a plurality of transmission control pulses, each of said information pulses having associated therewith a respectively corresponding one of said transmission control pulses that bears a predetermined temporal relationship relative to the information pulse;
- and
- for each of said information pulses, canceling interference associated with the information pulse based on the respectively corresponding transmission control pulse and the associated temporal relationship.
A pulsed radar receiver apparatus for operation on a moving platform, comprising:
- an input for receiving a temporal sequence of radar pulses respectively associated with intervals of transmission by a radar transponder, said temporal sequence of radar pulses including a plurality of information pulses and a plurality of transmission control pulses, each of said information pulses having associated therewith a respectively corresponding one of said transmission control pulses that bears a predetermined temporal relationship relative to the information pulse;
- and
- an interference canceller coupled to said input, said interference canceller operable with respect to each of said information pulses for canceling interference associated with the information pulse based on the respectively corresponding transmission control pulse and the associated temporal relationship.
A method of producing a pulsed radar signal for transmission from a radar transponder to a moving radar receiver, comprising:
- providing in the pulsed radar signal a temporal sequence of radar pulses including a plurality of information pulses and a plurality of transmission control pulses;
- and
- providing for each of said information pulses a respectively corresponding one of said transmission control pulses that bears a predetermined temporal relationship relative to the information pulse and which is used by the radar receiver, together with said predetermined temporal relationship, to cancel interference associated with the information pulse.
A radar transponder apparatus for transmitting a pulsed radar signal to a moving radar receiver, comprising:
- an output for transmitting the pulsed radar signal;
- and
- a pulse production unit coupled to said output for providing in the pulsed radar signal a temporal sequence of radar pulses including a plurality of information pulses and a plurality of transmission control pulses, said pulse production unit configured to provide for each of said information pulses a respectively corresponding one of said transmission control pulses that bears a predetermined temporal relationship relative to the information pulse and which is used by the radar receiver, together with said predetermined temporal relationship, to cancel interference associated with the information pulse.
Dependencies are inferred from the claim text.