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A 1090es signal de-same-frequency overlapping method based on the quadratic inflection point method

A technology of secondary inflection point and overlapping method, which is applied in the direction of baseband system components, transmitter/receiver shaping network, etc., can solve the problem of not having the ability to decompose same-frequency overlapping of 1090ES pulse signals, increasing signal overlapping, Affect the accuracy and reliability of target information, etc., to achieve the effect of improving the ability of continuous monitoring, small amount of calculation, and simple algorithm

Active Publication Date: 2017-06-06
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

Method used

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  • A 1090es signal de-same-frequency overlapping method based on the quadratic inflection point method
  • A 1090es signal de-same-frequency overlapping method based on the quadratic inflection point method
  • A 1090es signal de-same-frequency overlapping method based on the quadratic inflection point method

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Embodiment

[0054] combine figure 1 , the following example is used to illustrate the present invention based on the quadratic inflection point method of 1090ES signal same-frequency overlapping method. The 1090ES RF signal is processed by the antenna, feeder, and receiver to output an analog video signal, which is sampled by the ADC to form a digital video signal, which is sent to the field programmable gate array (FPGA) for frame pulse detection and decoding. According to the Cramerau limit of pulse arrival time estimation under the condition of complete blindness of 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 requirement of the time-of-arrival estimation accuracy. The de-overlapping of the pulse signal is implemented in the FPGA to meet the needs of real-time processing. The...

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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 present invention relates to a method for removing same-frequency overlap of 1090ES signals based on a quadratic inflection point method, in particular to a method for removing same-frequency overlap of 1090ES signals based on a quadratic inflection point method. Background technique [0002] Automatic Dependent Surveillance-Broadcast (ADS-B) system is an air traffic control technology commonly used in international civil aviation systems. It is an aircraft operation monitoring system based on GPS global satellite positioning system and air-ground and air-air data link communications. The ADS-B system realizes the ground or air monitoring function of the target through the way that the aircraft actively sends its own relevant information. The International Civil Aviation Organization (ICAO) identified it as the main direction of future surveillance technology development, and the international aviation community is actively promoting the applicatio...

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Application Information

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Patent Type & Authority Patents(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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