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A reference phase shifter capable of improving phase resolution and a phase shifting method

A resolution and phase shifter technology, applied in the microwave field, can solve the problems of phase noise deterioration, low output frequency of digital phase shifting, etc., and achieve the effect of improving phase resolution

Active Publication Date: 2019-06-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the Nyquist sampling theorem, the digital phase shift output frequency is not high, and the phase noise deteriorates significantly at high frequencies

Method used

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  • A reference phase shifter capable of improving phase resolution and a phase shifting method
  • A reference phase shifter capable of improving phase resolution and a phase shifting method
  • A reference phase shifter capable of improving phase resolution and a phase shifting method

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Embodiment Construction

[0025] The present embodiment provides a kind of reference phase shifter that improves the phase resolution. Taking the satellite local oscillator frequency with an output frequency of 10.6 GHz as an example, a digital frequency synthesizer (DDS) can be selected to generate a reference frequency signal according to the output frequency. Its input phase-locked loop (PLL) performs reference phase shifting, and the circuit structure is as follows figure 1 As shown, the phase-locked loop includes a phase detector, a low-pass filter, a voltage-controlled oscillator, and an N frequency divider. The output of the converter is the desired output frequency. Combining DDS and PLL, while utilizing PLL for high local oscillator output, it also retains the high-precision digital phase shift of DDS. In this embodiment, the AD9959 chip is used as an example. This chip is a DDS chip with a phase resolution M of 14 bits and a frequency resolution of 32 bits. According to the DDS characteristi...

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Abstract

The invention discloses a reference phase shifter capable of improving phase resolution and a phase shifting method. The phase shifter comprises a reference frequency signal generator and a phase-locked loop connected with the reference frequency signal generator. The reference frequency signal generator generates the reference frequency and inputs the reference frequency into the phase-locked loop; the phase-locked loop comprises a phase discriminator, a low pass filter, a voltage-controlled oscillator and an N frequency divider, and the phase discriminator, a low pass filter, the voltage-controlled oscillator and the N frequency divider are in ring connection, the output of the voltage-controlled oscillator is the required output frequency, and the value of the frequency division ratio Nof the N frequency divider meets the following conditions, so that the product of N and the phase resolution of the reference frequency signal generator is not divided by 360 degrees, and the productof N and the phase resolution of the reference frequency signal generator is the maximum common multiple of 360 degrees. According to the present invention, the phase resolution can be improved, andthe high-resolution phase shift operation on a high-frequency signal is realized.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to a reference phase shifter and a phase shifting method for improving phase resolution. Background technique [0002] The phased array antenna regularly feeds a series of radiating elements of the planar array through a phase shifter to control the formed beam. The direction of the plane wave generated by this array depends on the phase difference between different array elements. Phased array has the advantages of beam flexibility, adaptive mode, and can monitor and track targets at the same time. The above characteristics make it widely used in radar. [0003] Phased array radar can be divided into two categories: passive phased array and active phased array. Among them, the active phased array does not adopt the centralized feeding method of the passive phased array, it is equipped with a separate active component for each element or sub-array, that is, the T / R component, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/085H01P1/18
Inventor 陈鹏胡博杜恒余旭涛张慧张在琛
Owner SOUTHEAST UNIV
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