31 results about "Antenna boresight" patented technology

A radar antenna has a reflector and maximum gain along its boresight. The reflector has a periphery, typically circular, rectangular or elliptical. A plurality of Global Positioning System (GPS) satellite signal receiving antennas are rigidly, mechanically attached to the reflector near its periphery. The plurality of GPS satellite signal receiving antennas are connected pairwise to a phase comparator for comparing a plurality of first phase differences induced by a first GPS satellite signal received concurrently between the plurality of GPS satellite signal receiving antennas. A Phase comparator measures the phase difference of the signal received at GPS satellite signal receiving antennas pairwise thus performing a differential phase measurement. This differential phase measurement is supplied to a computer for identifying an ambiguous boresight position using the phase differences measured by the phase comparator. The position of the GPS satellites is known with respect to the geo-location of the antenna. Thus, the boresight angle is derived from the phase difference of the carrier signal from the GPS satellite being received and the mechanical alignment information between the GPS satellite receiving antennas and radar antenna boresight stored during calibration / manufacture of the radar antenna. The ambiguity in the computed boresight position is resolved by making differential phase readings using the same GPS antennas from a second GPS satellite signal supplied by a second satellite.

A system and method for increasing the performance of a satellite communication system by using a multivariate analysis approach to optimize the pointing of the boresight of a satellite-mounted antenna. Optimizing the pointing of the boresight of the antenna minimizes sidelobe generation, and thus Co-Channel Interference (CCI) in geographic areas served by the system. By minimizing CCI, the overall system performance of the communication system is optimized. To optimize the pointing of the boresight of the antenna, the overall performance of the satellite communication system is determined, and the boresight of the antenna is iteratively repointed in the direction of increasing system performance until the optimized boresight pointing is determined. Alternatively, the frequency re-use plan of the satellite communication system may be analyzed to determine a high density cell region and the boresight may be pointed to the high density cell region.

The invention discloses a light spot aligning method based on a four-quadrant detector. The light spot aligning method specifically comprises the following steps of focusing an incident beam onto a photo-sensitive surface of the four-quadrant detector by a lens, and enabling the four-quadrant detector to convert a received light signal into four paths of electric signals; amplifying the obtained four paths of electric signals by an amplifying circuit, transmitting the signals to the signal processing unit, and sequentially performing A / D (analog to digital) conversion and Kalman filtering on the four paths of amplified electric signals in the signal processing unit; performing self-adaptive threshold judging on the four paths of processed electric signals, controlling the action of a cradle head according to judging results, and enabling the cradle head to drive the four-quadrant detector to act, so as to adjust the position of the incident light beam, and align the incident light spot. The light spot aligning method solves the problem of difficulty in aligning of the light spot due to simultaneous existence of light spot drifting and malalignment between light beam and antenna visual axis.