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US 5,847,675 AGranted
Radar with a wide instantaneous angular field and a high instantaneous angular resolution in particular for a missile homing head
OwnerHenri Poinsardinventor
Life of this patent
Estimating the term…
Abstract
This radar with a wide instantaneous angular field and a high instantaneous angular resolution, in particular for a missile homing head, includes essentially: a transmitting antenna with a relatively wide radiation pattern, transmitting a quasi-continuous wave; a receiving antenna including a plurality of radiating elements; means for formation of beams associated with said receiving antenna, to achieve a linear combination of the signals from the various radiating elements of said receiving antenna, in order to obtain a group of simultaneous reception beams allowing the instantaneous scanning of the airspace covered by said transmitting antenna.
Claims21
A radar with a wide instantaneous angular field and a high instantaneous angular resolution, comprising:
- a transmitting antenna having a radiation pattern covering all of said angular field, for transmitting a quasi-continuous wave consisting of successive elemental waves regularly spaced and having substantially constant amplitude;
- a receiving antenna having a plurality of radiating elements;
- means for forming beams associated with the receiving antenna, to obtain a linear combination of the signals coming from the various radiating elements of the receiving antenna, to obtain a group of simultaneous reception beams allowing the instantaneous scanning of the airspace covered by the transmission beam;
- and
- means for processing the phases of said signals coming from the various radiating elements with respect to corresponding successive elemental waves, to extract at least a velocity of a target located in said angular field.
2 more elements
A radar with a wide instantaneous angular field and a high instantaneous angular resolution, comprising:
- A transmitting antenna having a radiation pattern covering all of said angular field, for transmitting a quasi-continuous wave consisting of successive elemental waves regularly spaced and having substantially constant amplitude;
- a receiving antenna having a plurality of radiating elements;
- means for forming beams associated with the receiving antenna, to obtain a linear combination of the signals coming from the various radiating elements of the receiving antenna, to obtain a group of simultaneous scanning of the airspace covered by the transmission beam, wherein said receiving antenna is a two-dimensional array of radiating elements for simultaneous reception of beams along a first dimension of said array and with sequential electronic scanning on reception along a second dimension of said array.
A radar with a wide instantaneous angular field and a high instantaneous angular resolution, comprising:
- a transmitting antenna having a radiation pattern coverall all of said angular field, for transmitting a quasi-continuous wave consisting of successive elemental waves regularly spaced and having substantially constant amplitude;
- a receiving antenna having a plurality of radiating elements;
- means for forming beams associated with the receiving antenna, to obtain a linear combination of the signals coming from the various radiating elements of the receiving antenna, to obtain a group of simultaneous reception beams allowing the instantaneous scanning of the airspace covered by the transmission beam;
- and
- means for Doppler filtering received signals, wherein said Doppler filtering means are coupled in circuit between said receiving antenna and said beam forming means for forming.
2 more elements
A radar with a wide instantaneous angular field and high instantaneous angular resolution, comprising:
- a transmitting antenna having a radiation pattern covering all of said angular field, for transmitting a quasi-continuous wave consisting of successive elemental waves regularly spaced and having substantially constant amplitude;
- a receiving antenna having a plurality of radiating elements;
- means for forming beams associated with the receiving antenna, to obtain a linear combination of the signals coming from the various radiating elements of the receiving antenna, to obtain a group of simultaneous reception beams allowing the instantaneous scanning of the airspace covered by the transmission beam;
- and
- means for Doppler filtering received signals, wherein said beam forming means for formation of reception beams are coupled in circuit between said receiving antenna and said Doppler filtering means.
2 more elements
A radar with a wide instantaneous angular field and a high instantaneous angular resolution, comprising:
- a transmitting antenna having a radiation pattern coverall all of said angular field, for transmitting a quasi- continuous wave consisting of successive elemental waves regularly spaced and having substantially constant amplitude;
- a receiving antenna having a plurality of radiating elements;
- means for forming beams associated with the receiving antenna, to obtain a linear combination of the signals coming from the various radiating elements of the receiving antenna, to obtain a group of simultaneous reception beams allowing the instantaneous scanning of the airspace covered by the transmission beam;
- and
- means for Doppler filtering received signals, wherein said Doppler filtering means include a DFT operator performing a temporal discrete Fourier transformation, acting symmetrically on the input samples of a filtering cycle, distributed symmetrically around the time t"=.tau.OM+(T-.tau..sub.OM)/2, where t" denotes the time counted from the beginning of the filtering cycle in question, T denotes the duration of the filtering cycle, and .tau..sub.OM denotes a fixed delay corresponding to the estimated maximum delay for the received signals, the delay for the received signals being the spacing between the beginning of the transmitted signals and the beginning of the received signal.
2 more elements
A radar with a wide instantaneous angular field and a high instantaneous angular resolution, comprising:
- a transmitting antenna having a radiation pattern covering all of said angular field, for transmitting a quasi-continuous wave consisting of successive elemental waves regularly spaced and having substantially constant amplitude;
- a receiving antenna having a plurality of radiating elements;
- means for forming beams associated with the receiving antenna, to obtain a linear combination of the signals coming from the various radiating elements of the receiving antenna, to obtain a group of simultaneous reception beams allowing the instantaneous scanning of the airspace covered by the transmission beam;
- and
- a local oscillator that feeds an auxiliary antenna of small size, located at the back of the transmitting antenna and illuminating all said radiating elements of said receiving antenna.
2 more elements
Dependencies are inferred from the claim text.