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Single radio frequency channel correlation interferometer direction finding method and system

A technology of correlation interferometer and direction finding system, which is applied in the field of single radio frequency channel correlation interferometer direction finding system, can solve the problems of large number of channels and large hardware overhead, and achieve the effect of reducing complexity and cost, and simple structure

Pending Publication Date: 2022-05-13
SHANGHAI SATELLITE ENG INST
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Although the positioning accuracy of the circular array interferometer is higher than that of the orthogonal interferometer, due to the large number of channels, the hardware overhead is relatively large, and the software computing resources are much larger than the orthogonal interferometer. In order to improve the calculation efficiency of direction finding data, the main Solve this problem by using look-up table method

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  • Single radio frequency channel correlation interferometer direction finding method and system
  • Single radio frequency channel correlation interferometer direction finding method and system
  • Single radio frequency channel correlation interferometer direction finding method and system

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Embodiment 1

[0033] According to the direction finding method of a single radio frequency channel correlation interferometer provided by the present invention, such as Figures 1 to 3 As shown, it includes: connecting the circular antenna array 1 and the low noise amplifier 3 with a single-pole multi-throw radio frequency switch, and periodically modulating the single-pole multi-throw radio frequency switch 2, and obtaining the harmonic spectrum characteristics by analyzing the harmonic spectrum characteristics of the received signal after periodic modulation. Wave vector, correlating the obtained harmonic vector with the harmonic vector in the preset database to obtain the direction finding result.

[0034] Specifically, the preset database adopts: when radio signals are incident from different directions, measure the harmonics of the received signal of a single radio frequency channel and form a harmonic vector, and establish an index database between the harmonic vector and the incident ...

Embodiment 2

[0046] Embodiment 2 is a preferred example of embodiment 1

[0047] In order to reduce the complexity of the existing correlation interferometer direction finding system, the invention provides a single radio frequency channel correlation interferometer direction finding system and method.

[0048] Compared with the existing correlative interferometer direction finding system, the present invention has the advantage of simple structure, and only uses a single radio frequency channel to periodically connect each antenna on the circular array, and the harmonic vector is composed of the received signal, and then the correlative method estimates the direction of incidence of the signal.

[0049] The basic principle of the invention is: when the single-pole multi-throw switch periodically connects each antenna unit on the circular array, the received signal will generate harmonic components, and the frequency interval between the harmonics is equal to the modulation frequency. Whe...

Embodiment 3

[0073] Embodiment 3 is a preferred example of embodiment 1 and / or 2

[0074] Five-element circular array correlation interferometer direction finding

[0075] There are five antenna elements evenly distributed on a circle with a diameter of 1.2 meters. Firstly, the space pitch angle is divided into 90 parts, and the azimuth angle is divided into 360 parts, and the pitch angle and azimuth angle are divided into 1° intervals. For each pair of pitch and azimuth angles (θ, φ) p,q (p∈[0,89],q∈[0,359]), the single-pole multi-throw RF switch is set to periodically connect five antenna units sequentially, and the modulation cycle is 100ns. The pass time is 20ns. Analyze the spectrum of the signal received by a single radio frequency channel, the obtained signal spectrum is shown in the attached figure 2 As shown, the harmonic vector [Γ composed of fundamental wave and +1, +2, +3, +4 harmonic 0 ,Γ 1 ,…,Γ 4 ] (p,q) . After traversing all the pairs of pitch angles and azimuth a...

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Abstract

The invention provides a single radio frequency channel correlation interferometer direction finding method and system, and the method comprises the steps: connecting each unit of an antenna array through a single-pole multi-throw radio frequency switch, carrying out the periodic modulation of the single-pole multi-throw radio frequency switch, obtaining a harmonic vector through the analysis of the harmonic spectrum characteristics of a received signal after the periodic modulation, and carrying out the direction finding of a correlation interferometer. And performing correlation operation on the obtained harmonic vector and a harmonic vector in a preset database to obtain a direction finding result. According to the method, the complexity and the cost of the existing correlation interferometer direction finding system can be remarkably reduced, and the method is particularly suitable for a low-cost and high-precision radio direction finding system.

Description

technical field [0001] The invention relates to the technical field of radio engineering, in particular to a single radio frequency channel correlation interferometer direction finding system and method. Background technique [0002] Radio direction finding has a wide range of applications in spectrum management, electromagnetic signal remote sensing and anti-jamming, wireless positioning and other fields. In order to apply to handheld, unmanned aerial vehicles, low-orbit satellites and other payload-limited platforms, reducing the number of channels of the radio direction finding system is the only way. The traditional correlation interferometer direction finder often uses multiple radio frequency channels, and its weight, power consumption, and cost are relatively large. Using a switch matrix in the RF front end reduces the channel count of the interferometer direction finder to two or three. The R&SDDF007 direction finder of the Rohde Schwarz company in Germany realizes...

Claims

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 曹岸杰陈占胜狄慧王瀚霆朱维各孙伟伍国威贺冲
Owner SHANGHAI SATELLITE ENG INST