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A direction-finding system and method for broadband chirp signals based on time modulation

A technology of linear frequency modulation signal and time modulation, which is applied in the direction of frequency modulation carrier system, modulated carrier system, radio wave measurement system, etc. It can solve the problems of bandwidth modulation frequency limitation of incoming wave signal, and achieve the effect of saving cost and reducing complexity

Active Publication Date: 2020-07-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a time-modulated broadband chirp signal direction-finding system and method. The system is a time-modulated antenna array system. The system and method use a radio frequency switch to The incoming wave signal is adaptively filtered in the time-frequency domain, which solves the shortcoming that the bandwidth of the incoming wave signal is limited by the modulation frequency in the current type of direction finding technology, and realizes the direction finding of the broadband chirp signal without the need for band-pass filter banks and other hardware. Function

Method used

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  • A direction-finding system and method for broadband chirp signals based on time modulation
  • A direction-finding system and method for broadband chirp signals based on time modulation
  • A direction-finding system and method for broadband chirp signals based on time modulation

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Embodiment

[0050] This embodiment provides a broadband chirp signal direction finding system based on time modulation, including an antenna array module, a radio frequency switch module, a radio frequency receiving channel module, a time-frequency signal processing module, an output display module and a digital control module, wherein the radio frequency receiving The channel module includes a low-noise amplifier 3 , a mixer 4 , a radio frequency local oscillator unit 5 , a low-pass filter 6 and an analog-to-digital converter 7 . The printed dipole antenna array unit 1 of the antenna array module is connected with the single pole double throw switch (high-speed radio frequency switch) 2 of the radio frequency switch module, and the single pole double throw switch is connected with a low noise amplifier, and the low noise amplifier Connected with the mixer, the mixer is respectively connected with the radio frequency local oscillator and the low-pass filter, the low-pass filter is connecte...

example

[0063] Example, Wideband Chirp Signal Direction Finding

[0064] When the carrier frequency is f 0 =2GHz, the bandwidth is B=20MHz, and the chirp signal with duration T=200μs is at an azimuth angle of 15 ° When incident on the antenna array module, the antenna array element spacing (i.e. array element spacing) d=λ / 2=15cm, λ=c / f 0 is the wavelength of the incident signal, c is the propagation speed of electromagnetic waves in vacuum, and the timing diagram of the periodic opening and closing of the radio frequency switch module is shown in figure 2 As shown, its modulation period is T p = 1μs, modulation frequency f p = 1MHz, in one modulation period, the turn-on time of each antenna array unit is 0.5μs, the number of sub-band signals divided by the whole chirp signal M=T / T p =200.

[0065] image 3 The time-domain waveforms of the modulated timing signal (a), the incident linear FM signal (b) and the modulated linear FM signal (c) modulated by the RF switch are given re...

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Abstract

The invention provides a broadband linear frequency modulation signal direction finding system based on time modulation. An antenna array module is connected with a radio frequency switch module, theradio frequency switch module is connected with a radio frequency receiving channel module, the radio frequency receiving channel module is connected with a time-frequency signal processing module, the time-frequency signal processing module is connected with an output display module, and a digital control module is connected with the radio frequency switch module and the time-frequency signal processing module at the same time. The invention also provides a broadband linear frequency modulation signal direction finding method based on time modulation. The method aims to solve the direction finding problem of broadband linear frequency modulation signals in application of communication, radars and the like. Broadband incoming signals are filtered by the high-speed switching radio-frequencyswitch module and divided into a plurality of sub-band signals in a time domain, and the measurement of the incoming wave direction is realized by analyzing the time-frequency spectrum of each sub-band signal. The method has the advantages of being low in cost, simple in structure and low in algorithm complexity, and can be widely applied to the fields of broadband communication, electronic countermeasure and the like.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, in particular to a time modulation-based broadband linear frequency modulation signal direction finding system and method, which realize the direction finding function of the broadband linear frequency modulation signal. Background technique [0002] Direction finding technology is widely used in the fields of radar, sonar and wireless communication. Traditional direction finding methods (amplitude and phase comparison method, Doppler frequency shift method, arrival time difference estimation and spatial spectrum estimation methods) exist or the hardware structure is complicated. , high cost, or complex calculation, or low estimation accuracy. [0003] After searching, it was found that the application number is: 201310317954.0 Chinese patent application "Single-channel radio single-pass single-pass line power direction finding system", which proposes a smart single-channel direction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/46H04L27/10
CPCG01S3/465H04L27/103
Inventor 陈靖峰贺冲金荣洪耿军平梁仙灵朱卫仁
Owner SHANGHAI JIAO TONG UNIV
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