초록 ▼

A method for beamforming signals for an array of receiving or transmitting elements includes the steps of selecting a beam elevation and azimuth and grouping elements of an antenna array into element ensembles that are substantially aligned with a wavefront projection on the antenna array correspond

A method for beamforming signals for an array of receiving or transmitting elements includes the steps of selecting a beam elevation and azimuth and grouping elements of an antenna array into element ensembles that are substantially aligned with a wavefront projection on the antenna array corresponding to the selected beam elevation and azimuth.

대표청구항 ▼

A method for beamforming signals for an array of receiving or transmitting elements includes the steps of selecting a beam elevation and azimuth and grouping elements of an antenna array into element ensembles that are substantially aligned with a wavefront projection on the antenna array correspond

A method for beamforming signals for an array of receiving or transmitting elements includes the steps of selecting a beam elevation and azimuth and grouping elements of an antenna array into element ensembles that are substantially aligned with a wavefront projection on the antenna array corresponding to the selected beam elevation and azimuth. n adjusting member for adjusting the feedback factor of the feedback circuit, and further characterized in that the feedback circuit, the adder and the integrator are combined to a united circuit and the united circuit includes at least one adjustable current source connected to the common contact of a switch having two other contacts connected each to one terminal of a capacitor which performs the integrating function of the integrator, the switch being controlled by the D/A-converter and the adjusting member being operable to adjust the magnitude of the current delivered by said current source. 2. A sigma-delta modulator as claimed in claim 1, characterized in that the feedback circuit includes an attenuator which is adjustable by the adjusting member. 3. A sigma-delta modulator as claimed in claim 2, characterized in that the adjustable attenuator includes switched capacitors. 4. A sigma-delta modulator as claimed in claim 1, characterized in that the current source is composed of a number of partial current sources each connected to the common contact of the switch through respective further switches which are controllable by the adjusting member. 5. A sigma-delta modulator as claimed in claim 4, characterized in that the current sources have mutually different current values. 6. A sigma-delta modulator as claimed in claim 1, characterized in that the gain of the combination of the integrator and the quantizer is adjustable by the adjusting member. 7. A sigma-delta modulator as claimed in claim 6, characterized in that the adjusting member is operable to control the gain of the combination of the integrator and the quantizer in such a manner that the product of their individual gain factors is constant. 8. A sigma-delta modulator as claimed in claim 1, characterized in that the adjusting member is operable to continuously control the feedback factor of the feedback loop. 9. A sigma-delta modulator as claimed in claim 6, characterized in that the adjusting member is operable to continuously control the gain of the combination of the integrator and the quantizer.