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A method of decoding common-frequency overlapping of 1090 ES signals based on secondary inflexion-point method

A technology of quadratic inflection point and overlapping method, applied in baseband system components, shaping network in transmitter/receiver, etc., can solve the problem that the 1090ES pulse signal does not have the ability to resolve the same frequency overlap and affect the accuracy of target information It can improve the ability of continuous monitoring, the algorithm is simple, and the calculation amount is small.

Active Publication Date: 2015-03-04
THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology

However, in the airspace near a large hub airport with a large number of targets, the probability of signal overlap is greatly increased, and signal overlap will seriously affect the accuracy and reliability of the ground surveillance system to obtain target information
At present, the ground surveillance systems developed by domestic manufacturers do not yet have the ability to decompose the same frequency overlap of 1090ES pulse signals

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  • A method of decoding common-frequency overlapping of 1090 ES signals based on secondary inflexion-point method
  • A method of decoding common-frequency overlapping of 1090 ES signals based on secondary inflexion-point method
  • A method of decoding common-frequency overlapping of 1090 ES signals based on secondary inflexion-point method

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[0054] Combine figure 1 In the following, an example is used to illustrate the method for decoupling the same frequency overlap of the 1090ES signal based on the second inflection point method of the present invention. The 1090ES radio frequency signal is processed by the antenna, feeder, and receiver to output an analog video signal, which is sampled by ADC to form a digital video signal, which is sent to a field programmable gate array (FPGA) for frame pulse detection and decoding. According to the Crameruo limit of pulse arrival time estimation under the condition of fully blind signal parameters, the estimation accuracy of arrival time is proportional to the square of the sampling interval and inversely proportional to the signal-to-noise ratio. Therefore, the sampling frequency of the ADC can be determined according to the actual requirements for the accuracy of the arrival time estimation. The de-overlap of the pulse signal is implemented in FPGA to meet the needs of real...

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Abstract

In a method of decoding common-frequency overlapping of 1090 ES signals based on secondary inflexion-point method of the present invention, a video signal relevant accumulation is adopted, and two rounds of inflexion-point detection is performed, to extract a secondary inflexion-point and determine a starting time and a terminating time of double overlapped pulses, so as to achieve the function of correctly decoding under the circumstance of 1090 ES signals overlapping. Since it is hard for the common-frequency overlapped pulses to be separated from the angle of the signals, the present invention considers from the time domain feature of the overlapped signals of an envelope, and recovers the frame of the original signals by determining the starting time and the terminating time of the two overlapped pulses. The present invention can technically improve the current 1090 ES ground monitoring system, achieve correct decoding under the circumstance of 1090 ES signals overlapping, and increasing the continuous monitoring ability of the ground monitoring system at the airspace with multiple targets.

Description

Technical field [0001] The invention relates to a 1090ES signal decoupling method based on a secondary inflection point method, and in particular to a 1090ES signal decoupling method based on a secondary inflection point method. Background technique [0002] The Broadcast Automatic Dependent Surveillance (ADS-B) system is an air traffic control technology commonly used in the international civil aviation system. It is an aircraft operation monitoring system based on GPS global satellite positioning system and air-to-air data link communication. The ADS-B system realizes the monitoring function of the target on the ground or in the air by the aircraft actively sending its own relevant information. The International Civil Aviation Organization (ICAO) has identified it as the main direction for future surveillance technology development, and the international aviation community is actively promoting the application of this technology. Compared with the traditional secondary radar s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 朱栋赵春光王寿峰欧乐庆彭思成伟明章林马浩张钟江付乾良
Owner THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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