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

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...

AI Technical Summary

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.

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