Anti-jamming apparatus and method for compact array antenna
An anti-jamming apparatus and method for a compact array antenna are provided. The anti-jamming apparatus for a compact array antenna includes a Global Navigation Satellite System (GNSS) array antenna unit including a plurality of GNSS antennas for receiving GNSS signals transmitted from a satellite. A first beam-forming unit includes a plurality of combination units for receiving respective signals received by the plurality of GNSS antennas as a first reference signal and first auxiliary signals and combining the first reference signal with the first auxiliary signals, thus forming different beams. A second beam-forming unit receives signals of the different beams, and combining the signals of the different beams, thus forming an anti-jamming beam in which an invisible area is minimized.
1. An anti-jamming apparatus for a compact array antenna, comprising:
a Global Navigation Satellite System (GNSS) array antenna unit including a plurality of GNSS antennas for receiving GNSS signals transmitted from a satellite;
a first beam-forming unit including a plurality of combination units for receiving respective signals received by the plurality of GNSS antennas as a first reference signal and first auxiliary signals and combining the first reference signal with the first auxiliary signals, thus forming different beams; and
a second beam-forming unit for receiving signals of the different beams, and combining the signals of the different beams, thus forming an anti-jamming beam in which a satellite-invisible area is minimized,
wherein the first beam-forming unit comprises an allocation unit for allocating different first reference signals to the plurality of combination units
wherein the combination units assign different weights to the first reference signal and the first auxiliary signals using a power minimization technique and combine resulting signals, and
wherein the weights of the first auxiliary signals are values for minimizing energy of error between combinations of the first reference signal and the first auxiliary signals.
2. The anti-jamming apparatus of claim 1 , wherein the plurality of combination units form identical nulls so as to eliminate an identical jamming signal.
3. The anti-jamming apparatus of claim 1 , wherein the combination units are configured to form the different beams so that the satellite-invisible areas of the different beams are different from each other.
4. The anti-jamming apparatus of claim 1 , wherein the second beam-forming unit overlays a beam pattern by combining the signals of the different beams.
5. The anti-jamming apparatus of claim 1 , wherein the satellite-invisible area of the anti-jamming beam is a satellite-invisible area formed in common by the combination units.
6. The anti-jamming apparatus of claim 1 , wherein a gain of the anti-jamming beam is a value obtained by overlapping gains formed by the combination units.
7. The anti-jamming apparatus of claim 1 , wherein a number of the combination units corresponds to a number of GNSS antennas.
8. An anti-jamming method for a compact array antenna, comprising:
receiving Global Navigation Satellite System (GNSS) signals transmitted from a satellite through a plurality of GNSS antennas;
receiving respective signals received by the plurality of GNSS antennas as a first reference signal and first auxiliary signals and combining the first reference signal with the first auxiliary signals, thus forming different beams; and
receiving signals of the different beams, and combining the signals of the different beams, thus forming an anti-jamming beam in which a satellite-invisible area is minimized,
wherein forming the different beams comprises allocating different first reference signals,
wherein forming the different beams is configured to assign different weights to the first reference signal and the first auxiliary signals using a power minimization technique and combine resulting signals, and
wherein the weights of the first auxiliary signals are values for minimizing energy of error between combinations of the first reference signal and the first auxiliary signals.
9. The anti-jamming method of claim 8 , wherein forming the different beams comprises forming the different beams so that the different beams have identical nulls so as to eliminate an identical jamming signal.
10. The anti-jamming method of claim 8 , wherein forming the different beams comprises forming the different beams so that the different beams have satellite-invisible areas that are different from each other.
11. The anti-jamming method of claim 8 , wherein forming the anti-jamming beam comprises overlaying a beam pattern by combining the signals of the different beams.
12. The anti-jamming method of claim 8 , wherein the satellite-invisible area of the anti-jamming beam is a satellite-invisible area formed in common by the different beams.
13. The anti-jamming method of claim 8 , wherein a gain of the anti-jamming beam is a value obtained by overlapping gains formed by the different beams.
14. The anti-jamming method of claim 8 , wherein a number of the different beams corresponds to a number of GNSS antennas.