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Satellite navigation deception interference suppression method based on deception interference DOA estimation

A deceptive jamming and satellite navigation technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of scenes that cannot be applied to multiple spoofing sources, complex structures, and large calculations, so as to suppress spoofing Type interference, small amount of calculation, simple effect

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

S. Daneshmand proposed a deceptive interference suppression technology based on multi-antennas, which cross-correlates the received signal of each antenna with the reference antenna to obtain the angle of arrival of deceptive interference. However, this suppression technology cannot be applied to multiple antennas. Scenario of a deceptive source
Rockwell Collins of the United States proposed a method of using array antennas to suppress spoofing interference. This method estimates the direction of satellite signals based on the information tracked by the receiver for each satellite, and identifies the direction of spoofing interference. Finally, the antenna is zeroed in the direction of the deceptive interference to suppress the deceptive interference, but this method requires the feedback information of the receiver, the structure is complex, and the amount of calculation is large

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  • Satellite navigation deception interference suppression method based on deception interference DOA estimation
  • Satellite navigation deception interference suppression method based on deception interference DOA estimation
  • Satellite navigation deception interference suppression method based on deception interference DOA estimation

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Embodiment Construction

[0017] The satellite navigation deceitful interference suppression method based on deceptive interference DOA estimation provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. For convenience, the following uses the GPS (Global Positioning System) system and an equidistant linear array composed of N array elements as an example to illustrate.

[0018] like Figure 4 As shown, the satellite navigation spoofed interference suppression method based on spoofed interference DOA estimation provided by the present invention comprises the following steps carried out in order:

[0019] (1) Down-convert the radio frequency signal received by the array antenna into a digital intermediate frequency signal:

[0020] The forwarding deceptive jamming is composed of multiple real satellite signal forwarding signals (pseudo-satellite signals) and is transmitted in the same direction. In order to effectively int...

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Abstract

Provided is a satellite navigation deception interference suppression method based on deception interference DOA estimation. The method comprises the following sequentially performed steps that firstly radio frequency signals received by array antennas are down-converted into digital intermediate-frequency signals; influence of noise on estimation of coming direction of deception interference is reduced by utilizing the periodic repetition characteristic of C / A codes, and then a CLEAN method is adopted to estimate coming direction of multiple deception interference sources and the number of the deception interference sources is judged; and finally a linearly constrained minimum variance (LCMV) algorithm is utilized to obtain antenna beams when deception interference coming direction constrains are null, and antenna null is broadened by adopting a first-order differential constraint algorithm. Multiple forwarding sources can be effectively suppressed so that the method is easy to realize and small in computation amount and can act as an independent anti-deception interference module to be embedded in a common receiver.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation anti-jamming, in particular to a satellite navigation deceptive interference suppression method based on deceptive interference DOA estimation. Background technique [0002] Since the Global Navigation Satellite System (GNSS for short) can provide time / space reference and all real-time dynamic information related to the position, it has been widely used in navigation, timing, precision measurement, etc., thus ensuring global satellite navigation System security is particularly important. However, GNSS receivers are highly susceptible to interference because GNSS signals reach the ground at very low signal power. [0003] At present, the research on GNSS interference suppression methods mainly focuses on suppressive interference suppression methods, and there are relatively few studies on deceptive interference suppression methods. Different from suppressive interference, deceptive i...

Claims

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Application Information

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IPC IPC(8): G01S19/21
CPCG01S19/215
Inventor 张耀天王璐吴仁彪卢丹王文益
Owner CIVIL AVIATION UNIV OF CHINA
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