Time Domain Analysis

Pt

Description

In antenna ranges, extraneous signals can be introduced that contaminate the antenna pattern. In outdoor far field ranges, for example, this could be a set of ground bounce signals. In compact ranges, this could be reflections off the side walls, ceiling and floor. These contaminating signals have longer path lengths and thus longer travel times that the primary, direct signal path. The time domain helps identify and separate these other signal paths. If the extraneous signals are separated in time from the desired signal, they can be filtered out with time domain processing.

  • Data Requirements

    There are several minimum requirements for the data to be processed with the Time Domain Analysis module. They include:

    • There must be at least 8 frequencies
    • Frequencies must be in MI-3000 “range” mode for even spacing
    • There must be a bandwidth of at least 50 MHz

    For reference, a 100 MHz BW gives a range resolution of 117.85 in (299.3 cm) and 8 frequencies give coverage of 942.80 in (2394.7 cm) or 78.5 ft (23.92 m), large enough for most antennas under test on outdoor ranges. Wider frequency bandwidths provide improved resolution in the time domain. This allows filtering of unwanted signals that are much closer to the antenna under test.


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