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Device and method for the improved directional estimation and decoding by means of secondary radar signals

A technology for direction estimation, secondary radar, applied in measurement devices, direction finders using radio waves, reflection/re-radiation of radio waves, etc., can solve manufacturing and installation tolerances, doubling problems, etc.

Active Publication Date: 2011-01-26
IAD GESELLSCHAFT FUER INFORMATIK AUTOMATISIERUNG & DATENVERARBEITUNG MBH
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  • Abstract
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  • Application Information

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Problems solved by technology

In particular, secondary radar equipment is not used, where deficiencies of the hardware used are taken into account, such as doubled antenna elements, different antenna input impedances, different spacing between antenna elements, manufacturing and installation tolerances, etc.

Method used

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  • Device and method for the improved directional estimation and decoding by means of secondary radar signals
  • Device and method for the improved directional estimation and decoding by means of secondary radar signals
  • Device and method for the improved directional estimation and decoding by means of secondary radar signals

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Embodiment Construction

[0058] Secondary radar at 1090 MHz is used to identify and communicate general flight data between flying objects, ground vehicles and air traffic control. The present work consists in the task of extending the application of its multilateration-based concept to the field of position determination.

[0059] However, the construction of a multilaterations system is a difficult task. The signal arrival times must be determined very precisely and precise synchronization of all participating receivers must be achieved. Furthermore, the system is sensitive to intersymbol interference (ISI). Although E.Piracci, N.Petrochilos and G.Galati disclose an algorithm in EURAD, 2007 "Single-antenna Projection Algorithm to discriminate superimposed Secondary Surveillance Radar Mode S Signals", which reduces the impact of ISI, but the algorithm Based on a data model considering only Mode S signals.

[0060] An array of antennas for direction estimation could improve the performance of multi...

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Abstract

1. A device and a method for the improved directional estimation and decoding by means of secondary radar signals. 2.1 Radio-based positioning systems on the basis of secondary radar signals are known. For this purpose special receiver systems are utilized for estimating the direction, and special receiver systems are utilized for decoding secondary radar signals. In particular, a secondary radar system is absent, which, among others, takes into consideration any shortcomings of the hardware used, such as coupled antenna elements, different low-end impedances, deviating distances between the antenna elements, manufacturing and installation tolerances, and the like. 2.2 The device for directional estimation and / or decoding secondary radar signals according to the invention comprises the following: - at least one array A comprising M antenna elements AE - an amplifier LNA and bandpass filter F 1 combination connected to a plug-in connector S of the respective antenna element AE, at the filter output of said combination a first linear amplifier V 1 being connected for amplifying the band-limited signal, - a mixer M connected to the first linear amplifier V l for the frequency conversion into a ZF region, - a second linear amplifier V2 and bandpass filter F2 combination connected to the mixer output for amplifying and limiting the bandwidth of the signal in the ZF region, - a first analog-to-digital converter AD1 connected to the second bandpass filter F2 for scanning and quantifying the filter output signal. 2.3 The invention is within the field of secondary radar systems.

Description

technical field [0001] The invention relates to a device for improved direction estimation using secondary radar signals according to claim 1 and a corresponding method according to claim 10 . Background technique [0002] Primary radar refers to a radar device that only and directly converts the radar principle, that is, a radar device that analyzes the direct (passive) echo of a previously emitted high-frequency pulse. This concept is used to distinguish secondary radar, ie a technique in which echoes actively generated by detected objects are used. In practice, a combination of both methods is usually employed (eg in air traffic control in the case of ground radar). A primary radar device does not rely on an object actively generating a signal in order to be able to detect the object. This is relevant, for example, in the field of air traffic control, since the aircraft must be detected even in the event of a failure of the aviation transponder. In the event of interfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/78G01S13/91G01S3/74
CPCG01S13/781G01S3/74
Inventor H·汉佩尔U·贝罗尔德C·雷克L-P·施密特J·魏因齐尔
Owner IAD GESELLSCHAFT FUER INFORMATIK AUTOMATISIERUNG & DATENVERARBEITUNG MBH
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