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Doppler direction finder based on four-dimensional antenna array

A technology of a direction finding device and an antenna array, which is applied in the field of antenna engineering and can solve problems such as affecting the direction finding accuracy, Doppler frequency difference, and limited application range.

Active Publication Date: 2017-03-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology is based on a mobile platform, and its application range is limited; and the Doppler frequency difference generated by mechanical movement is below 100Hz, and it is very difficult for the signal processing system to detect, which will actually affect the direction finding accuracy.

Method used

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  • Doppler direction finder based on four-dimensional antenna array
  • Doppler direction finder based on four-dimensional antenna array
  • Doppler direction finder based on four-dimensional antenna array

Examples

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Embodiment Construction

[0033] specific implementation plan

[0034] figure 1A functional block diagram of a specific embodiment of the direction-finding system based on the four-dimensional antenna array is given. The whole direction finding system consists of antenna oscillator, phase shifter, RF switch, complex programmable logic device (CPLD), power amplifier, pulse modulator, continuous oscillator, mixer, intermediate frequency amplifier, phase detector, Doppler filter devices etc. The antenna is shared for transmitting and receiving, and includes N=8 uniformly arranged units, and the distance between the units is half a wavelength. Each array element is connected to a radio frequency switch, and the radio frequency switch is periodically turned on and off to impose time modulation on the antenna array.

[0035] In the antenna transmitting phase, the array is modulated by variable aperture size timing (VAS); in the antenna receiving phase, the array is modulated by unidirectional moving phas...

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PUM

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Abstract

The invention discloses a Doppler direction finder based on a four-dimensional antenna array. The Doppler direction finder comprises a transceiving antenna array, a high-speed RF switch which is connected with easy array element, a complex programmable logic device, and a backend signal generating and processing device. Phase center movement occurs when the four-directional antenna array performs receiving. Different Doppler frequencies are generated for echo signals in different directions. Through extracting the Doppler frequency, direction of an object can be found. Furthermore in signal receiving, the number of antenna conducting units can be changed in real time. In operation of a direction finding system, the number of the conducting units in signal receiving can be changed, and furthermore a direction finding range and a direction finding precision are adjusted. The Doppler direction finder based on the four-dimensional antenna array has advantages of simple structure, high flexibility in use, and high suitability for different direction finding requirements.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, and relates to radar detection and array signal processing. Specifically, it is a four-dimensional antenna array for sending and receiving that is based on periodic time modulation and adopts two kinds of time sequences to work together. It can be flexibly used for radars with different detection requirements direction finding system. Background technique [0002] In 1963, American scholar Kummer and others proposed the concept of time-modulated antenna array: by periodically switching on and off the antenna excitation, the radiation aperture size of the antenna can be controlled in the "time" dimension. The time-modulated antenna array is a kind of four-dimensional antenna array. The four-dimensional antenna array uses radio frequency switches to control the working state of each unit according to the predetermined working sequence, so that the aperture of the antenna array changes ...

Claims

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Application Information

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IPC IPC(8): G01S3/52
CPCG01S3/52
Inventor 杨仕文倪东陈益凯杨锋肖仕伟刘坤宁
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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