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Ads-b receiver system with multipath mitigation

A receiver and multipath signal technology, applied in traffic control systems, diversity/multi-antenna systems, transmission systems, etc., can solve the problems of unrecoverable bit loss and inability to prevent multipath interference

Inactive Publication Date: 2013-05-29
HONEYWELL INT INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So a RAKE receiver will not be able to protect against this type of multipath interference and will not be able to recover the bit loss without error correction

Method used

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  • Ads-b receiver system with multipath mitigation
  • Ads-b receiver system with multipath mitigation
  • Ads-b receiver system with multipath mitigation

Examples

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Embodiment Construction

[0053] Figure 4 is a block diagram of an Automatic Dependent Surveillance-Broadcast (ADS-B) receiver system 20 that provides suppression of short delay multipath using a message decoding algorithm with long delay multipath suppression and multi-antenna diversity reception. The system 20 includes a plurality of antennas 22, a receiver 26, a beamforming device 28, a plurality of pulse detection filters 29, a device 30 for performing ADS-B burst detection for a plurality of diversity receivers, diversity reception with offset selection A device 34 for interference due to long delay multipath on the machine output, and a device 36 for performing message decoding.

[0054] Antenna space diversity is used to combat interference fading due to short-delay multipath. Mode S transponder receivers, also used to receive ADS-B messages, employ top and bottom mounted omnidirectional antennas for diversity reception. Because these antennas are spaced in the vertical plane, they are most e...

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Abstract

Systems and methods for receiving ADS-B messages in environments where multipath propagation corrupts the messages or blocks the reception of the messages. An exemplary system combines RF signal processing and digital signal processing techniques to make it possible to receive ADS-B messages in the presence of multipath reflections from nearby structures and / or farther out structures. The system uses an array of horizontally spaced antennas (22). The RF signals from the antennas are combined by the receiver (26, 28) so as to form a set of beams with different azimuth antenna patterns to increase the probability that the multipath does not combine destructively with the line-of-sight path in at least one of the beams. This effectively removes multipath reflections where the delay of the multipath relative to the line-of-sight path is less than 100-200 nanoseconds. The system is also configured to remove multipath reflections with greater delays relative to the line-of-sight path.

Description

Background technique [0001] When an aircraft is operating on the ground at an airport, it has been observed that reception from the aircraft's ADS-B squitter within the line of sight of an Automatic Dependent Surveillance-Broadcast (ADS-B) receiver is often unreliable. Careful inspection of structures near the airport has shown that multipath reflections from these structures are a possible explanation for the reception failure of the ADS-B staccato oscillator. When the aircraft is in the air or moving at takeoff or landing speeds, the effects of multipath reflections are insignificant and can result in the loss of a single choppy oscillator. However, when the aircraft is stationary or moving slowly, multipath reflections can hide the true ADS-B staccato oscillator. [0002] The most common source of multipath in a flat, open area such as an airport runway is ground reflection. However, the distance between aircraft operating on the airport ground is too short for ground ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10
CPCH04B7/02H04L25/03019H04B7/18506H04B7/086H04B7/0667G08G5/0008H04B1/1081
Inventor A·马拉加
Owner HONEYWELL INT INC
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