Hierarchically elaborated phased-array antenna modules and method of operation
A method of operation for a hierarchically elaborated phased-array antenna. Within a plurality of front end modules a phased-array processing die individually transforms phase and gain according to a register array. The register array in each RFIC is grouped into a local register group and a global 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 global register controlling overall RFIC function. The method efficiently elaborates phase shift weights into a submodule of a phase array antenna system. Within each subarray phase control submodule the method recursively elaborates weights to control phase shifters. The method receives and transforms pairs of major operators and minor operators. The method distributes to each submodule determining its own base phase shift weight per its unique configuration.
1. A method for operation of a phased-array antenna comprising at a submodule apparatus:
receiving a first major operand on a digital signal bus;
receiving a first and a second minor operand on the digital signal bus;
storing the first major operand as a base phase shift for the submodule into a register;
multiplying by a digital circuit the first minor operand with an index and
adding to the base phase shift to determine a first vector of phase shift weights for each of a plurality of shifters; and
multiplying by the digital circuit a second minor operand with an index and adding to each member of the first vector to determine phase shift weights for all the shifters wherein each antenna element comprises a phase shifter and gain equalizer coupled to a plurality of local registers which contain an antenna weight vector table.
2. The method of claim 1 further comprising:
receiving a second major operand on the digital signal bus;
multiplying by a digital circuit the first and second major operands with indexes to determine a base phase shift for each submodule according to its configuration; and
adding the phase shift error correction bias for each element of the antenna array into the antenna weight vector table.
3. The method of claim 1 for operation of a submodule apparatus further comprising: receiving a first major operand on the digital signal bus;
receiving a first and a second minor operand on the digital signal bus;
storing the first major operand as a base phase shift for the submodule into a register; recursively adding by a digital logic circuit a first minor operand to the base phase shift to determine a first vector of phase shift weights for each of a plurality of shifters; and
recursively adding a second minor operand to each member of the first vector in the antenna weight vector table to determine phase shift weights for all the shifters.
4. The method of claim 1 further comprising:
receiving a second major operand on the digital signal bus;
recursively adding the first and second major operands to determine and store into non-transitory computer readable media a base phase shift for each submodule according to its configuration; and
adding the phase shift error correction bias into the antenna weight vector table for each element of the antenna array.
5. The method of claim 4 , the method further comprising:
determining a region that an antenna array of submodules will be pointing next R+1; determining a condition that the region is adequately covered by one of a set of d phase weights previously associated with d directions for each element according to a content addressable memory store device wherein the phase weights are computed using an element index and a submodule index; and
when the condition is true, transmitting to each submodule an instruction to load a phase weight from the location d.
6. The method of claim 5 for controlling RFIC devices in an antenna array further comprising:
initializing common registers with calibrated gain values;
storing phase shifter values in local registers; and
determining antenna element phase and gain settings.
7. The method of claim 6 further comprising a lookup method for determining antenna element phase and gain settings, said lookup method comprising:
on the tabulation mode being set, accepting data transmitted on a data bus from the SPI master;
loading a binary representation of a phase vector table stored in non-transitory computer readable digital media into common local registers;
loading phase shifter values into appropriate local registers, and
looking up in non-transitory computer readable digital media gain settings and storing said gain settings for each associated phase shifter value into the local registers.
8. The method of claim 6 further comprising a method for determining antenna element phase and gain settings, said method comprising:
accepting data transmitted on a data bus from a SPI master; and
loading constants into Global and common local registers;
determining by digital multiplier and adder logic circuits phase shifter values per (Equation 2) and loading the digital phase shifter values into appropriate local registers; and,
looking up in non-transitory computer readable digital media gain settings and storing said gain settings for each associated phase shifter value into the local registers.