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Ultra-short wave electromagnetic interference cancelling device

An electromagnetic interference and cancellation device technology, applied in the direction of electrical components, transmission systems, etc., can solve problems such as different center frequencies, center frequencies are not fixed, and filters cannot be used, so as to suppress coupling interference, improve compatibility, and improve interference The effect of rejection ratio

Active Publication Date: 2010-10-06
CHINA SHIP DEV & DESIGN CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The useful signal and the interference signal are both ultrashort-wave narrow-band sinusoidal signals, but they have different center frequencies, and the center frequency is not fixed, so a filter with fixed parameters cannot be used
[0004] At present, there is no electromagnetic interference cancellation device in the ultra-short wave band for suppressing the coupling interference of co-located transceiver antennas on the market

Method used

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Examples

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Embodiment Construction

[0038] figure 1 It is a structural block diagram of an embodiment of the present invention, including a sampler and an interference cancellation host.

[0039] The input end of the sampler is connected with the transmitter, the output end is connected with the transmitting antenna, and the coupling end is connected with the interference cancellation host. The function of the sampler is to obtain a certain energy interference signal from the transmitter, send it to the interference cancellation host, and perform amplitude and phase conversion to make it equal to the interference signal in the receiving antenna. The coupling degree of the sampler is determined according to the ratio of the transmitting power of the transmitter to the interference power on the receiving antenna, and the value range is usually 10-20dB. The output end of the sampler obtains most of the power of the input end, which does not affect the normal transmission state of the transmitter, and the interfere...

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Abstract

The invention provides an ultra-short wave electromagnetic interference cancelling device, comprising a sampler and an interference cancelling host. The interference cancelling host comprises a quadrature bridge, an I-path bipolar attenuator, a Q-path bipolar attenuator, an I-path correlation operation circuit, a Q-path correlation operation circuit, a first combiner, a second combiner, a directional coupler and a power divider. The sampler samples interference signals from an interference transmitter; the quadrature bridge, the I-path bipolar attenuator, the Q-path bipolar attenuator and the first and second combiners are used for adjusting the amplitude and phase of the sampled signal so that the sampled signals have the same amplitudes and opposite phases as the interference signals in a receiving antenna; the I-path and Q-path correlation operation circuits carry out an correlation operation on an error signal and the sampled signal; the operation results separately control the I-path and Q-path bipolar attenuators to form a negative feedback loop and maximize cancellation of the interference signal. The invention improves the interference rejection ratio and rejects the coupling interference between a receiving antenna and a transmitting antenna in a common field without reducing the utilization ratio of low frequency spectrum resources.

Description

technical field [0001] The invention belongs to an electromagnetic interference control device, in particular to an ultrashort wave electromagnetic interference cancellation device. Background technique [0002] Coupling interference between transmitting and receiving antennas in a common site is one of the common forms of electromagnetic interference. Since the transmitting and receiving antennas are arranged on the same site, the distance between them is small and the isolation is low. The transmission power of the ultrashort wave transmitting antenna is usually high, reaching tens of watts or even hundreds of watts, which will generate a large coupling voltage (from tens of mV to several V) at the nearby receiving antenna, which will form a strong The interference power will seriously affect the normal operation of the receiver, causing the receiver to be blocked or even burned. The signal passed by the ultrashort wave transmitter and receiver is a sinusoidal narrowband...

Claims

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Application Information

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IPC IPC(8): H04B1/10
Inventor 谭辉刘义李晶黄明亮易学勤奚秀娟潘涵
Owner CHINA SHIP DEV & DESIGN CENT
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