Wideband multi-channel receiver with fixed-frequency notch filter for interference rejection

A notch filter, fixed frequency technology, applied in the field of broadband multi-channel receivers with fixed frequency notch filter with interference suppression, can solve the problems of tunable RF notch filter desired signal attenuation and so on

Inactive Publication Date: 2012-07-18
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, the selectivity of tunable RF notch filters implemented with lumped circuit technology is too wide and may attenuate the desired signal too much when strong interferers are close in frequency

Method used

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  • Wideband multi-channel receiver with fixed-frequency notch filter for interference rejection
  • Wideband multi-channel receiver with fixed-frequency notch filter for interference rejection
  • Wideband multi-channel receiver with fixed-frequency notch filter for interference rejection

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Embodiment Construction

[0010] In the following detailed description, various embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is understood that other embodiments may be utilized without departing from the scope of the present invention. Accordingly, the following detailed description is not to be taken in a limiting sense.

[0011] A wideband multi-channel receiver utilizing a narrowband fixed frequency notch filter for interference suppression is provided. The receiver architecture typically includes a mixing stage that converts the entire radio frequency (RF) band of the signal to an intermediate frequency (IF) band; the mixing stage is followed by a filtering stage that includes a notch filter, such as a narrow fixed frequency of the IF band-stop filter; and a digital control stage that controls the frequency of the mixing stage so that strong interfering signals and the rejecting frequency of the notch filter are aligned.

[0012]...

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Abstract

The invention discloses a wideband multi-channel receiver with fixed-frequency notch filter for interference rejection. The wideband multi-channel receiver comprises an antenna configured to receive a radio frequency band comprising an aviation VHF communication band, an aviation VHF navigation band, an aviation L-band, or combinations thereof. A band-pass filter is in signal communication with the antenna, and a low-noise amplifier is in signal communication with the band-pass filter. A mixer is in signal communication with the low-noise amplifier and is configured to translate a radio frequency band to an intermediate frequency (IF) band. A tunable local oscillator is in signal communication with the mixer. At least one fixed-frequency notch filter is in signal communication with the mixer, with the notch filter configured to reject at least one interference signal in the IF band while passing remaining signals in the IF band. An analog-to-digital converter is in signal communication with the notch filter and is configured to convert the remaining signals in the IF band to digital signals. A digital processing system is in signal communication with the analog-to-digital converter.

Description

Background technique [0001] In aeronautical communication and / or navigation radio receivers, it may be advantageous to demodulate or decode information from more than one channel, all simultaneously on a wideband radio frequency (RF) received from a single antenna signal. Various architectures and methods for implementing such systems have been previously described and / or developed. In one approach, a continuous radio frequency (RF) band of aeronautical communication and / or navigation signals is simultaneously converted to the digital domain with a high speed analog-to-digital converter. The digital processing system is then capable of simultaneously selecting, processing, decoding and outputting useful information to the aircrew from two or more of the channels present in the RF communication and / or navigation bands. [0002] One of the challenges with this architecture is the dynamic range required for a single wideband receiver to operate with all possible signal strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/16
CPCH04B1/0017H04B1/0021H04B1/1036H04L25/08H04B1/0014H04B1/0007
Inventor A·马拉加T·P·吉布森J·K·亨特G·特里普莱特
Owner HONEYWELL INT INC
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