Method for finding defective active array modules using an FFT over phase states
First Claim
1. A method for evaluating performance of a module of an active antenna array, said array comprising a plurality of modules, said method comprising the steps of:
- turning off al modules of said array but the one module under test;
determining a fast fourier transform (FFT) power spectrum over the phase states, including a power component related to said module under test and a plurality of additional power components; and
comparing selected said components to evaluate the performance of said module under test.
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Accused Products
Abstract
All modules of an active antenna array with the exception of a module under test are disabled. Samples representative of the output of the transmit and receive phase shifter outputs of the module under test are taken for successive pairs of transmit/receive modes of operation at the N successive phase increments of the module under test. Fast Fourier transforms (FFTs) are performed over the samples separately for transmit and receive states, and the power in each FFT filter for each state is detected. Power comparison between the power in filter 1 (numbered from 0) and the power in the sum of filters 2 through (N-1) is then used to determine whether the module under test is defective.
22 Citations
19 Claims
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1. A method for evaluating performance of a module of an active antenna array, said array comprising a plurality of modules, said method comprising the steps of:
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turning off al modules of said array but the one module under test; determining a fast fourier transform (FFT) power spectrum over the phase states, including a power component related to said module under test and a plurality of additional power components; and comparing selected said components to evaluate the performance of said module under test. - View Dependent Claims (2, 3)
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- 4. The method of claim I wherein said spectrum further includes a leakage power component.
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7. In an active antenna array comprising a plurality of array modules, each module including a transmit phase shifter and a receive phase shifter, a method of detecting a failed module of the array comprising the steps of:
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turning off all modules of the array but one, said one module comprising a module under test; cycling said module under test through alternating receive and transmit states; shifting the phase of the module under test after each successive pair of receive and transmit states; sampling first and second signals, the first signal being representative of the transmit phase shifter output, the second signal being representative of the receive phase shifter output, said first signal being sampled during each transmit state, said second signal being sampled during each receive state; collecting the output samples taken in the receive state into a first set and those taken in the transmit state into a second set; determining the average power in a succession of Fourier transform filters taken over the samples of said first set; determining the average power in a succession of Fourier transform filters taken over the samples of said second set; and comparing the power in selected said filters and rejecting the module under test as failed based upon said comparison. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification