Phased Array Direction Finding Antenna Based on Periodic Phase Modulation and Its Application Method
A direction-finding antenna and periodic phase technology, which is applied to antenna arrays powered on individually, antenna combinations with different interactions, antennas, etc., can solve the problems of long direction-finding time and high hardware requirements for phased arrays, and achieve direction-finding speed Fast, fast and high-precision estimation of effects
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[0055] Embodiment: 8-element phased array direction finding based on periodic phase modulation
[0056] It is assumed that the phased array with 8 elements evenly arranged is in the receiving state. The working frequency of the phased array is 1GHz, and the distance between the array elements is half a wavelength. Perform periodic phase modulation on the phase shifters on the 8 units of the phased array, and the modulation period T p 100ns. For the phase shifter on the nth unit, in a modulation period T p Within, only in [(n-1) / T p ,n / T p ], set the state of the digital phase shifter to 0°, and set the state of the digital phase shifter to 180° in the rest of the time period. State Timing Reference for Phase Shifters on 8 Unit Channels figure 2 .
[0057] Under the above modulation sequence, when a single-frequency signal is incident on the phased array, various harmonic components will be generated, and the interval between the harmonic components is equal to the modu...
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