Correlation-based satellite-borne ADS-B header detection method

A detection method and header technology, which are applied in baseband systems, baseband system components, and shaping networks in transmitters/receivers, etc., can solve problems such as the inability to meet the requirements of the spaceborne environment.

Active Publication Date: 2016-10-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

Therefore, the existing ADS-B receivers are far from

Method used

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  • Correlation-based satellite-borne ADS-B header detection method
  • Correlation-based satellite-borne ADS-B header detection method
  • Correlation-based satellite-borne ADS-B header detection method

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Embodiment

[0064] Such as Figure 2-9 As shown, this embodiment provides a correlation-based satellite-borne ADS-B header detection method. The method is an FPGA-based digital circuit. The processed signal is a digital baseband signal sampled by an ADC with a sampling rate of 10MHz. The baseband signal The bandwidth is 1.5MHz.

[0065] In this embodiment, the related satellite-borne ADS-B header detection method includes the following steps:

[0066] 1. Perform modulo operation on I / Q two orthogonal signals to extract the envelope S(k) of the baseband signal; the FPGA implementation of this step is figure 2 Mod_Calculate.

[0067] Specifically, get two orthogonal baseband signals I(k) and Q(k) from the ADC; then, calculate the modulus of I(k) and Q(k): Get S(k), S(k) is the baseband envelope signal. Among them, the modulo operation uses The approximate algorithm, the RTL level circuit such as image 3 Shown.

[0068] 2. Carry out autocorrelation filter processing on the obtained baseband env...

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Abstract

The invention discloses a correlation-based satellite-borne ADS-B header detection method, and solves the problems of more data consumption, low precision and the like in the prior art. The detection method comprises the following steps of: (1), extracting baseband envelope signals based on two orthogonal signals; (2), performing auto-correlation filtering of the extracted baseband envelope signals so as to obtain auto-correlation filtered signals; (3), extracting the position of the final effective pulse; (4), performing header frame detection, DF authentication and power consistency detection based on the position of the final effective pulse and mutually correlated signals, and executing the next step if simultaneously passing header frame detection, DF authentication and power consistency detection; (5), re-triggering judgement; and (6), extracting the header and data bit information. Compared with the existing ground and airborne header detection algorithm, the sensitivity is relatively high; and thus, the method can be well suitable for ultra-large range coverage requirements of a satellite-borne system.

Description

Technical field [0001] The present invention relates to the technical field of digital signal processing, in particular, to a related satellite-borne ADS-B header detection method. Background technique [0002] Currently, ADS-B receivers are mainly ground receivers. The coverage of terrestrial receivers is limited and will be restricted by terrain. For example, the deployment of terrestrial ADS-B receivers on the vast ocean will be very difficult, and it will require a huge number to achieve full coverage of the ocean. The cost of terrestrial receivers will also be an unbearable figure. However, if the ADS-B receiver is placed on the satellite, this problem can be solved perfectly. [0003] The coverage radius of the spaceborne ADS-B receiver can reach 3000km, which is a huge advantage compared to the 160nm coverage radius of the ground receiver. It is time for the on-board ADS-B system to increase its global coverage from the current 10% to 100%. [0004] The main advantage of t...

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Application Information

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IPC IPC(8): H04L1/00H04L12/815H04L25/03H04L47/22
CPCH04L1/0045H04L1/0061H04L25/03019H04L25/03343H04L47/225H04L47/23
Inventor 李桓吴骏李洪星谢作全鲍中华吴小丹李玉柏王坚
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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