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Two-dimensional direction finding method and device for passive radar seeker based on spatial spectrum estimation

A technology of spatial spectrum estimation and passive radar, which is applied to direction finders using radio waves, directional multi-channel systems using radio waves, and radio wave direction/bias determination systems, etc. Direction finding, inability to obtain signal or noise subspace, wrong estimation of incoming wave direction, etc.

Active Publication Date: 2022-05-13
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0008] Aiming at the defects of the prior art, the object of the present invention is to provide a two-dimensional direction finding method and device for passive radar seekers based on spatial spectrum estimation, aiming at solving the problem that existing passive radar seekers use spatial spectrum estimation to measure When the number of radiation sources is known, it needs to be estimated when the number of radiation sources is known. Once the number of radiation sources is not estimated accurately, the correct signal or noise subspace cannot be obtained, resulting in an error in the estimation of the direction of arrival, and then it is impossible to conduct a passive radar seeker. The problem of accurate two-dimensional direction finding

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  • Two-dimensional direction finding method and device for passive radar seeker based on spatial spectrum estimation
  • Two-dimensional direction finding method and device for passive radar seeker based on spatial spectrum estimation
  • Two-dimensional direction finding method and device for passive radar seeker based on spatial spectrum estimation

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Embodiment

[0076] The passive radar seeker antenna array is arranged in a 10-element uniform circular array, and the radius of the circular array is 15cm; four radiation source signals with the same carrier frequency, different frequency modulation and different incoming wave directions are set in the far field; the incoming wave direction is relative to the body coordinates The arrival angles of the system are (55°, 50°), (28°, 10°), (62°, -10°), (43°, -40°); the carrier frequency of the radiated linear frequency modulation signal is 1GHz; The coefficients are 5, 15, 25, 35 respectively; the signal-to-noise ratio is 20dB; the sampling rate of the direction finding system is 10GHz, and the number of data snapshots is 1000;

[0077] Step 2: Time T is set to 0.1s;

[0078] Step 3: Assume that the number N of radiation sources is 5;

[0079] Step four: T 1 Take 20ms at all times;

[0080] Step Eight: T 2 Take 70ms at all times;

[0081] Step 9: Generate the spatial spectrum of the radi...

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Abstract

The invention provides a two-dimensional direction finding method and device for a passive radar seeker based on spatial spectrum estimation, which belongs to the technical field of electronic countermeasures. The method includes: placing the antenna array corresponding to the passive radar seeker on the elevation plane and / or the azimuth Rotate; set the number of radiation sources N; use the spatial spectrum estimation method to estimate the spatial spectrum of the radiation source relative to the antenna array coordinate system; use the rotation angle on the elevation plane and the azimuth plane to calculate the rotation matrix; The spatial spectrum of the radar seeker body coordinate system; Kalman filtering is used to generate the spatial spectrum of the radiation source relative to the passive radar seeker body coordinates within time T; If the values ​​are greater than the resolution angle of elevation angle and resolution angle of azimuth angle, then N is the estimated number of radiation sources, otherwise N minus 1. The invention can solve the problems that the method for estimating the number of radiation sources based on information theory is cumbersome and has low accuracy in complex electromagnetic environments.

Description

technical field [0001] The invention belongs to the technical field of electronic countermeasures, and more specifically relates to a two-dimensional direction finding method and device for a passive radar seeker based on spatial spectrum estimation. Background technique [0002] Passive radar seekers use electromagnetic signals radiated by radiation sources as guidance information to guide attack weapons (such as anti-radiation missiles, anti-radiation drones, etc.) source. [0003] In order to quickly search for target signals and find direction, modern passive radar seekers generally use wide-beam circularly polarized antennas for interferometer direction finding, so the resolution angle is relatively large. The decoy system is set up near the radiation source, which takes advantage of the inherent shortcomings of the passive radar seeker's wide beam and low angular resolution, so that the seeker cannot distinguish the target and the decoy signal, causing the decoy to de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14G01S3/74
CPCG01S3/14G01S3/74
Inventor 冷毅王资王冰切黎静亓晓彤周锦曾英航
Owner AIR FORCE EARLY WARNING ACADEMY
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