Hierarchically elaborated phased-array antenna modules and faster beam steering method of operation
An apparatus substantially updates all the phase shifter values of a phased array antenna by using “global write” to update these parameters to all phased-array transformation circuits simultaneously via a serial bus. Antenna elements, each controlled by a phased-array transformation circuit, are individually configured to transform phase and gain according to a register array. The register array has a local register group and a central register group, the local registers physically placed close in proximity to RF chains which each correspond to an element of array antenna, whereby each set of local registers control an individual antenna element and a central register controlling overall beam steering function. The apparatus is configured to efficiently elaborate phase shift weights into a submodule of a phase array antenna system with low noise and bandwidth.
1. A method for control of a Phased-Array Transformation (PhAT) circuit with a non-transient parameter store in which are antenna weight values which have stored during test, manufacturing, installation, tuning, or off-line maintenance, the method comprising: for a range of antenna beam directions,
receiving off a serial bus an Antenna Element Control Value which is an address in the non-transient parameter store where the antenna weight values to be used were previously stored;
retrieving the antenna weight value for each antenna element; and
transforming a signal transmitted from or a signal received by each antenna element.
2. The method of claim 1 further comprising, on the condition that a desired beam direction is not within the range of beam directions for which antenna weight values were previously stored in the non-transient parameter store, operating a Phased-Array Transformation circuit with an antenna weight value computation circuit by:
receiving off the serial bus an Antenna Element Control Value which includes operands to determine a base antenna weight of one antenna element; and
reading the non-transient parameter store for an adjustment for each incremental i and each incremental j of the antenna element array.
3. The method of claim 2 further comprising operating a Phased-Array Transformation circuit with a non-transient parameter store, an antenna weight value computation circuit, and an antenna weight cache store, on the condition an Antenna Element Array Controller tracks previously transmitted operands and determines an index into the antenna weight cache store, the method comprising:
receiving off the serial bus an Antenna Element Control Value which is an index into the antenna weight cache store for a previously computed set of antenna weights;
retrieving the antenna weight value for each antenna element from cache; and
transforming a signal transmitted from or a signal received by each antenna element.
4. The method of claim 2 further comprising operating a Phased-Array Transformation circuit with a non-transient parameter store, an antenna weight value computation circuit, an antenna weight store addressable by operand hashes, and a circuit to write to and read from the antenna weight store according to operand hashes, on the condition that an Antenna Element Array Controller computes and transmits a hash of operands before transmitting the operands, the method comprising:
receiving a hash of an operand;
determining if antenna weight values are stored at the location of the antenna weight store corresponding to the hash;
reading the antenna weight values;
transforming signals with the antenna weight value; and
otherwise proceeding to compute and store antenna weight values if not previously stored at the location corresponding to the hash.