United anti-interference method based on array antennas and GPS/SINS

An array antenna and narrowband interference technology, which is applied in the field of integrated navigation technology, can solve the problems that the time domain processing method cannot suppress broadband interference, and the air domain filter cannot gain, etc.

Active Publication Date: 2014-05-14
HARBIN ENG UNIV
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Problems solved by technology

[0006] However, the above traditional anti-jamming methods all have certain defects.
The pure time domain processing method cannot suppress broadband interference, and the nulling method in air domain filtering cannot provide gain in the direction of satellite signals, and satellite signals may also be suppressed

Method used

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  • United anti-interference method based on array antennas and GPS/SINS
  • United anti-interference method based on array antennas and GPS/SINS
  • United anti-interference method based on array antennas and GPS/SINS

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Embodiment Construction

[0075] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0076] Step 1: Initialize carrier position, velocity and attitude information

[0077] as attached figure 1 As shown, the position and attitude of the carrier need to be initialized first. In the geodetic coordinate system, set the coordinates of the carrier at the initial moment: latitude L=45°, longitude λ=126° and height h=200m. Initialize the attitude angle of the carrier, including pitch angle θ=0°, roll angle γ=0° and azimuth angle ψ=45°. Then set the flight path of the carrier, which can be set as static, linear motion or circular motion and other trajectories. Set the east speed V of the carrier according to the required flight path of the carrier E , north speed V N and skyward velocity V U . Thus obtaining the ideal gyroscope and accelerometer outputs, f E , f N and f U Expressed as accelerometer output in east, north and celestial directions, resp...

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Abstract

The invention provides a united anti-interference method based on array antennas and a GPS/SINS. The method includes the steps that after the position and the posture of a carrier are initialized, a GPS/SINS integrated navigation state equation and a measurement equation are built; the position and the posture of the carrier are provided in real time through GPS/SINS integrated navigation, and the current position of a satellite is calculated according to satellite ephemeris information to obtain a guiding vector from the satellite to the carrier; the guiding vector serves as prior information of a multi-constraint minimum variance space-time self-adaptive processing algorithm and suppresses broadband interference and narrow-band interference in a space domain and a time domain at the same time. According to the united anti-interference method, wave beams can be formed in the direction of a plurality of visual satellites at the same time, and null steering is formed in the interference direction, so that interference signals are suppressed while satellite signals are enhanced. An antenna array of a round structure is adopted, the position and the posture of the carrier are provided for forming the wave beams of the array antennas through GPS/SINS integrated navigation, the position of satellite is provided by the adoption of a satellite ephemeris, and therefore the prior information is provided for forming the wave beams.

Description

technical field [0001] The present invention relates to an integrated navigation technology, specifically an array antenna and GPS (Global Positioning System) / SINS (Strapdown Inertial Navigation System) integrated navigation technology. Background technique [0002] The GPS navigation system can provide its users with accurate position, speed and time information covering the whole world around the clock, and its application value is getting higher and higher. However, with the improvement of man-made jamming technology, satellites can no longer meet user needs only relying on its spread spectrum system for anti-jamming. According to ICD-200, commercial GPS receivers have an anti-jamming tolerance of no more than 24dB (depending on the noise level). That is, if the interference-to-signal ratio is greater than 24dB, the commercial GPS C / A code receiver cannot keep track of the signal. Tests have shown that a jammer with a power of 1W can disable the C / A code receiver within...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01C21/165G01S19/21G01S19/49
Inventor 王伟李强徐定杰沈锋王咸鹏刘明凯范岳刘海峰宋金阳桑静
Owner HARBIN ENG UNIV
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