ADS-B (Automatic Dependent Surveillance-Broadcast) blanket jamming suppression method based on improved power inversion method

A suppressive interference and ADS-B technology, which is applied in the field of ADS-B interference suppression, can solve the problems of weak ADS-B signals, achieve the effect of suppressing suppressive interference and improving the signal-to-interference-noise ratio

Inactive Publication Date: 2015-03-04
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

However, since the ADS-B signal is very weak, only 10-20dB higher than the nois

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  • ADS-B (Automatic Dependent Surveillance-Broadcast) blanket jamming suppression method based on improved power inversion method
  • ADS-B (Automatic Dependent Surveillance-Broadcast) blanket jamming suppression method based on improved power inversion method
  • ADS-B (Automatic Dependent Surveillance-Broadcast) blanket jamming suppression method based on improved power inversion method

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[0019] The ADS-B suppressive interference suppression method based on the improved power inversion method provided by the present invention will be described in detail below in conjunction with the embodiments and drawings (taking a uniform linear array as an example).

[0020] Such as figure 1 As shown, the ADS-B suppressive interference suppression method based on the improved power inversion method provided by the present invention is to use the adaptive array antenna to suppress interference, that is, by embedding a power-based Adaptive ADS-B suppression interference suppression module of inversion method ( figure 1 The dotted line part) is realized without changing the internal structure of the ADS-B receiver.

[0021] first use figure 1 The adaptive ADS-B suppressive interference suppression module shown in the middle dotted line down-samples the digital IF signal processed by down-conversion, A / D conversion, etc., and then calculates the antenna array weight according...

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Abstract

The invention discloses an ADS-B (Automatic Dependent Surveillance-Broadcast) blanket jamming suppression method based on an improved power inversion method. The ADS-B blanket jamming suppression method comprises the following steps of converting a radio frequency signal received by an array antenna to a digital intermediate frequency signal; carrying out down-sampling on the digital intermediate frequency signal; estimating a covariance matrix of a receiving signal by utilizing a signal sample after down-sampling; and computing an adaptive antenna array weighting vector based on the improved power inversion method by utilizing the covariance matrix. According to the ADS-B blanket jamming suppression method, the characteristics of short duration and intermittence of an ADS-B signal and persistence of blanket jamming are combined, through carrying out down-sampling on the digital intermediate frequency signal and estimating the covariance matrix by utilizing the signal sample after down-sampling, the influence of the ADS-B signal on the covariance matrix of the receiving signal is weakened; the array weighting vector is computed by utilizing the covariance matrix, so that beam forming is carried out, and thus the blanket jamming is suppressed. By adopting the ADS-B blanket jamming suppression method, an antenna pattern can form null in a jamming suppression direction and keeps gain unchanged basically, so that the blanket jamming is suppressed.

Description

technical field [0001] The invention belongs to the technical field of ADS-B interference suppression, in particular to an ADS-B suppressive interference suppression method based on an improved power inversion method. Background technique [0002] Automatic Dependent Surveillance-Broadcast (ADS-B) is an aircraft surveillance technology based on global satellite navigation system and ground-air, air-air data link communication. Surveillance technology has broad application prospects in the field of air traffic control. However, because the ADS-B signal is very weak, only 10-20dB higher than the noise, it is easily affected by various intentional and unintentional interferences. If the interference signal is very strong and exceeds the minimum trigger threshold of the ADS-B receiver, the ADS-B receiver will be unable to work, so that information such as the aircraft's position, speed, and flight purpose cannot be obtained, resulting in serious consequences. Therefore, ADS is ...

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Application Information

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IPC IPC(8): H04B1/10H04B7/08
Inventor 吴仁彪陈庚王文益卢丹王璐贾琼琼
Owner CIVIL AVIATION UNIV OF CHINA
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