Anti-jamming apparatus and method for a radar system
First Claim
1. An anti-jamming device for a radar system having a main antenna and a first receiving chain for receiving and processing a received signal vp, for reducing the effects of a plurality K of jammers, comprisinga single electronic-scan auxiliary antenna having a plurality of radiating elements;
- a second receiving chain for receiving and processing a signal vc received by the said auxiliary antenna;
supply means for each of the radiating elements, said supply means being controlled by an external signal Sc and/or by a first and a second control signal SAi, SBi supplied by the said anti-jamming device, for sighting said auxiliary antenna successively towards each of said K jammers, and for making the said auxiliary antenna radiate according to a specific pattern;
first means for computing components Hkx, Hky of a field Hk radiated by said main antenna in the direction of each jammer of order k, k being between 1 and k, from the signals vp, vc respectively received by said main antenna and said auxiliary antenna;
second means for computing said control signals SAi, SBi of the supply means corresponding to each radiating element ei of order, i being between 1 and M, to obtain a radiation diagram which has, in the direction of each jammer, a maximum, components of which are those components Hkx, Hky of the field Hk radiated by the main antenna in the direction of the said each jammer which were computed by said first means for computing; and
third means for generating a signal corresponding to that which would be received by said main antenna in the absence of jammers and which is equal to a linear vectorial combination of the signal vp received by the main antenna, less the signal vc received by the auxiliary antenna when the said auxiliary antenna has a radiation pattern computed by the second means for computing.
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Accused Products
Abstract
Anti-jamming apparatus and method for a radar system having a main antenna utilizes a single electronic-scan auxiliary antenna having a plurality of radiating elements each coupled to appropriate phase shift means. The auxiliary antenna is successively sighted in directions of each of a plurality of jammers. First and second receiving chains respectively coupled to the main and auxiliary antennas supplies a processor with components of the signals received by the antennas. The computer supplies control signals to control the sighting of the auxiliary antenna so that it radiates in the direction of each jammer maximum radiation values, the components of which are those of the field radiated by the main antenna in the direction of the sighted jammer. The processor also provides an output signal comprising a vectorial combination of the signals received by the main and auxiliary antennas. The auxiliary antenna is thus successively used as an auxiliary adjusting antenna, and then used as an anti-jamming antenna.
19 Citations
14 Claims
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1. An anti-jamming device for a radar system having a main antenna and a first receiving chain for receiving and processing a received signal vp, for reducing the effects of a plurality K of jammers, comprising
a single electronic-scan auxiliary antenna having a plurality of radiating elements; -
a second receiving chain for receiving and processing a signal vc received by the said auxiliary antenna; supply means for each of the radiating elements, said supply means being controlled by an external signal Sc and/or by a first and a second control signal SAi, SBi supplied by the said anti-jamming device, for sighting said auxiliary antenna successively towards each of said K jammers, and for making the said auxiliary antenna radiate according to a specific pattern; first means for computing components Hkx, Hky of a field Hk radiated by said main antenna in the direction of each jammer of order k, k being between 1 and k, from the signals vp, vc respectively received by said main antenna and said auxiliary antenna; second means for computing said control signals SAi, SBi of the supply means corresponding to each radiating element ei of order, i being between 1 and M, to obtain a radiation diagram which has, in the direction of each jammer, a maximum, components of which are those components Hkx, Hky of the field Hk radiated by the main antenna in the direction of the said each jammer which were computed by said first means for computing; and third means for generating a signal corresponding to that which would be received by said main antenna in the absence of jammers and which is equal to a linear vectorial combination of the signal vp received by the main antenna, less the signal vc received by the auxiliary antenna when the said auxiliary antenna has a radiation pattern computed by the second means for computing. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An anti-jamming device for a radar system having a main antenna, for reducing the effects of a plurality of jammers, comprising:
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a single electronic-scan auxiliary antenna having a plurality of radiating elements each having associated phase shift means; means for successively sighting said auxiliary antenna in directions of each of said plurality of jammers; and processing means for (a) computing components of a signal field illuminated by said main antenna in the direction of each jammer sighted by said auxiliary antenna;
(b) computing an illumination law for said auxiliary antenna to obtain a radiation pattern which has, in the direction of each sighted jammer, a maximum, components of which are said components of said field illuminated by said main antenna in said direction of each sighted jammer; and
(c) generating an output signal corresponding to a signal which would be received by said main antenna in the absence of said jammers, by forming a linear vectorial combination of the signal received by said main antenna less the signal received by said auxiliary antenna adjusted so as to have a radiation pattern with maximum values in the direction of each said sighted jammer. - View Dependent Claims (8, 9, 10)
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11. An anti-jamming method for a radar system having a main antenna, for reducing the effects of a plurality of jammers, comprising the steps of:
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coupling to said radar system a single electronic-scan auxiliary antenna having a plurality of radiating elements each having associated phase shift means; successively sighting said auxiliary antenna in directions of each of said plurality of jammers; computing components of a signal field illuminated by said main antenna in the direction of each jammer sighted by said auxiliary antenna; computing an illumination law for said auxiliary antenna to obtain a radiation pattern which has, in the direction of each sighted jammer, a maximum, components of which are said components of said field illuminated by said main antenna in said direction of each sighted jammer; and generating an output signal corresponding to a signal which would be received by said main antenna in the absence of said jammers, by forming a linear vectorial combination of the signal received by said main antenna less the signal received by said auxiliary antenna adjusted so as to have a radiation pattern with maximum values in the direction of each said sighted jammer. - View Dependent Claims (12, 13, 14)
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Specification