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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

Active Publication Date: 2021-08-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the existing phased array direction finding methods have problems such as long time for direction finding and high requirements for phased array hardware, so it is necessary to further explore fast and high-precision phased array direction finding technology

Method used

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  • Phased Array Direction Finding Antenna Based on Periodic Phase Modulation and Its Application Method
  • Phased Array Direction Finding Antenna Based on Periodic Phase Modulation and Its Application Method
  • Phased Array Direction Finding Antenna Based on Periodic Phase Modulation and Its Application Method

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Embodiment

[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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Abstract

The invention provides a phased array direction-finding antenna based on periodic phase modulation and its use method, comprising: an antenna unit 1 and a digital phase shifter 2, the digital phase shifter 2 is connected to the antenna unit 1 one by one, and the antenna unit 1 The phase of the RF signal sent and received is periodically modulated. The invention performs periodic phase modulation on the phase shifter of the phased array antenna, and obtains the incident direction of the signal by analyzing the spectrum characteristics of the received signal, and can quickly and high-precision estimate the direction of the radio incoming wave, and has a fast direction finding speed. It is especially suitable for phased array radar, communication and electronic countermeasure systems that need to measure the direction of the target.

Description

technical field [0001] The present invention relates to the technical field of antennas, in particular to a phased array direction-finding antenna based on periodic phase modulation and a method for using the same. Background technique [0002] Phased array antennas have the advantages of flexible beam pointing and controllable pattern, and have been widely used in communication systems. With the popularization of WiFi 6 technology and 5G mobile communication technology, millimeter-wave phased arrays will be more and more used in indoor short-range mobile communication systems, which require real-time measurement and tracking of the direction of mobile users. In existing communication systems using phased array antennas, cone beam scanning or sum and difference beam methods are often used to determine the relative positions between communication systems. Although the phased array has the characteristic of beam agility, it still takes considerable time to complete a cone bea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q3/38H01Q21/06H01Q21/29H04B7/06
CPCH01Q3/38H01Q21/06H01Q21/29H04B7/0602
Inventor 贺冲陈靖峰曹岸杰白旭东倪刚金荣洪朱卫仁梁仙灵耿军平
Owner SHANGHAI JIAO TONG UNIV
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