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Radio direction finding method based on time modulation array harmonic energy detection

A technology of radio direction finding and harmonic energy, applied in direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve problems such as high hardware and algorithm complexity, and achieve high energy-saving effects and low power consumption , the effect of small physical size

Pending Publication Date: 2019-05-24
XIHUA UNIV
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Problems solved by technology

The accuracy of the spatial spectrum estimation method and the TDOA method is very good, while their hardware and algorithm complexity are very high

Method used

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  • Radio direction finding method based on time modulation array harmonic energy detection
  • Radio direction finding method based on time modulation array harmonic energy detection
  • Radio direction finding method based on time modulation array harmonic energy detection

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Embodiment Construction

[0038] The technical solution provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] The method is described below in conjunction with the accompanying drawings, as figure 1 As shown, the specific steps are as follows:

[0040] Step 1: The FPGA outputs modulation signals to control the working state of the TMA.

[0041] The modulation signal is a square wave control signal with a fixed duty cycle, and there is no superposition of signals between each signal and no mutual influence. The switch control signal (modulation signal) output by the FPGA controls a single-pole multi-throw switch to switch the working state of the antennas in the antenna array, and gate the received signals from different antennas. The modulated waveform is as figure 2 and image 3 shown.

[0042] The modulation signal is a square wave control signal with a fixed duty cycle, and there is no superposition of signals between each s...

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Abstract

The invention belongs to the field of radio monitoring, and particularly relates to a radio direction finding method based on time modulation array harmonic energy detection. The method includes thata time modulation array method is adopted, N antennas in an antenna array are controlled through N different control clock signals input with one Tm time duration to enable working state of the antenna controlled by each clock in the antenna array to change along with the corresponding control signal, and direction finding of an unknown target signal is realized by analyzing a drawing result of adirectional diagram of the antenna array. The method is comparatively low in complexity, and a system is relatively simple in physical realization, easy in subsequent optimization, small in physical size, suitable for various complex environments and lower in time delay. Only one radio frequency receiving link is used, so that power consumption of the system is minimized, and better energy savingeffect is realized.

Description

technical field [0001] The invention belongs to the field of radio monitoring, in particular to a radio direction finding method based on time modulation array harmonic energy detection. Background technique [0002] Direction of arrival estimation is widely used in mobile communications, radio management, and military electronic systems. In recent years, direction finding has new applications in mobile Internet positioning services, such as indoor navigation, reversing search, etc. The ever-increasing demands require high precision with low complexity. Common direction finding methods include amplitude ratio method, interferometer direction finding method, time difference of arrival method, Doppler direction finding method, spatial spectrum direction finding method, etc. Amplitude comparison direction finding is based on the radio waves in progress, using the direction characteristics of the direction finding antenna array or direction finding antenna, and measuring the i...

Claims

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Application Information

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IPC IPC(8): G01S3/14
Inventor 张学军白琳陈群
Owner XIHUA UNIV
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