A passive beacon device for microwave interception

A beacon and microwave technology, applied in the direction of circuit devices, diversity/multi-antenna systems, space transmit diversity, etc., can solve the problems of high reflector material or requirements, complex echo signal processing, and small beacon radar scattering cross section. Achieve the effects of improving anti-interference ability, satisfying long-term deployment, and improving listening quality

Active Publication Date: 2020-07-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of beacon device has the common disadvantages of existing passive beacon devices, such as high reflector material or requirements, complex echo signal processing, and small radar cross-section of the beacon, etc.

Method used

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  • A passive beacon device for microwave interception
  • A passive beacon device for microwave interception
  • A passive beacon device for microwave interception

Examples

Experimental program
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Effect test

Embodiment 1

[0032] combine figure 1 , a passive beacon device for microwave interception, comprising a radar at the interception end, an antenna at the acquisition end, a power divider, a rectification and filtering circuit, a pickup device and a mixer.

[0033] Use the pickup device to complete voice signal collection and energy form conversion. Here we take the electret microphone as an example. The working voltage U of the low power consumption model in the electret microphone series is DS =1.5V, operating current I DS =0.1mA, then its power consumption is 0.15mW, that is -8dBm.

[0034] In the process of using frequency mixing to modulate the voice signal to the carrier, the energy of the carrier is required to drive the work. Taking the principle of double-balanced frequency mixing as an example, it needs -80dBm. The power of this part is extremely small and can be incorporated into the calculation of the energy required for the pickup device;

[0035] combine figure 2 , using th...

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PUM

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Abstract

The invention discloses a passive beacon device used for microwave interception. The device includes an interception end radar, a collection end antenna, a power divider, a rectification filter circuit, a pickup device and a frequency mixer. A carrier wave with high energy is emitted by the interception end radar, and the carrier wave with high energy is received by the collection end antenna andis transmitted to the power divider; alternating current energy is extracted from the carrier wave with high energy through the power divider, the alternating current energy is converted into direct current energy through the rectification filter circuit, and the direct current energy provides energy for a microwave interception beacon source device; the pickup device and the frequency mixer are used for pickup work with high quality, and modulation of a sound electric signal and the carrier wave with high frequency. The probability of the device being intercepted is reduced, the interceptioneffect is improved, and the requirements of long time disposition using are satisfied.

Description

technical field [0001] The invention relates to the technical field of wireless interception, in particular to a passive beacon device for microwave interception. Background technique [0002] As the most direct and effective information carrier, language plays an important role in human society. Intercepting the content of conversations of specific groups or targets has always been an important task of national security departments, intelligence agencies, and criminal investigation units. Therefore, the form Various listening devices have also been vigorously developed. [0003] As an emerging representative of interception technology, microwave interception develops rapidly due to its high concealment and long interception distance. At present, the main working principle of microwave listening devices is to detect micro-movements on the surface of the reflector caused by sound. The beacon device is generally a flat plate or resonator with good conductivity and elasticity....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/40
CPCH02J50/20H04B1/40H04B7/04
Inventor 肖泽龙滑亚腾许建中吴礼许辉达
Owner NANJING UNIV OF SCI & TECH
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