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Direction finding device for phase interferometer and phase spectrum interferometer based on multiple baselines

A direction-finding device and phase spectrum technology, which is applied to measurement devices, direction-determining directional devices, radio wave measurement systems, etc., can solve the problems of rarely giving details of the phase interferometer algorithm implementation, and less research, so as to avoid countermeasures. Trigonometric operations, ensuring direction finding accuracy, and ensuring the effect of achievability

Inactive Publication Date: 2013-02-13
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Previously, people paid more attention to the problem of phase ambiguity resolution, and a variety of deblurring methods based on multi-baselines (including the correlation interferometer method) have been proposed. The implementation details of the phase interferometer algorithm combined with the actual hardware platform

Method used

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  • Direction finding device for phase interferometer and phase spectrum interferometer based on multiple baselines
  • Direction finding device for phase interferometer and phase spectrum interferometer based on multiple baselines
  • Direction finding device for phase interferometer and phase spectrum interferometer based on multiple baselines

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Embodiment Construction

[0029] The device of the invention comprises an antenna array, a multi-channel digital receiving unit and a digital signal processing unit electrically connected in sequence.

[0030] The antenna array uses 8 omnidirectional antennas evenly distributed on a circle to receive electromagnetic signals in the VHF frequency band, and the 8 signals are respectively introduced into the multi-channel digital receiving unit through 8 coaxial cables.

[0031] The multi-channel digital receiving unit performs analog filtering, amplification, mixing and other processing on the signal received by the antenna array, and then obtains a digital signal with good amplitude and phase consistency through ADC synchronous sampling, and finally, after digital down-conversion and array calibration , Constant false alarm threshold detection and secondary quantization and other array signal preprocessing processes.

[0032] The antenna array of this device is popular as figure 1 As shown, the antenna ...

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Abstract

The invention discloses a direction finding device for a phase interferometer and a phase spectrum interferometer based on an orthogonal / non-orthogonal multiple baselines. According to direction-finding algorithms of the phase interferometer and the phase spectrum interferometer, the direction finding device is designed by integrally considering factors such as an actual direction-finding environment, the frequency range of an incident signal, the direction-finding requirement, hardware sources and the like. According to the direction finding device, the processing of a digital signal is cooperatively finished by two FPGAs (Field Programmable Gate Array) and a DSP (Digital Signal Processor); and two direction-finding algorithms of the phase interferometer and the phase spectrum interferometer based on the orthogonal / non-orthogonal multiple baselines are realized respectively for a narrow frequency band single-source signal and a wide frequency band multi-source signal. The direction finding device has the advantages of simple algorithm, high speed of calculation, higher direction finding precision and lower requirement on hardware resources; and the direction finding device can be used in application occasions such as quick acquisition of two-dimensional arrival direction of a single-source or multi-source signal and the like.

Description

technical field [0001] The invention relates to a multi-baseline-based phase-phase spectrum interferometer direction-finding device, in particular to a digital processing algorithm and a corresponding hardware unit in the direction-finding device. Background technique [0002] Passive positioning technology is a technology that uses the electromagnetic radiation of the detected target itself to achieve target positioning. Since the positioning system itself does not emit electromagnetic waves, it can avoid anti-radar equipment, detect and locate targets covertly, and has a series of advantages such as strong anti-interference ability and long working distance. [0003] One of the cores of passive positioning technology lies in the high-precision direction finding of electromagnetic radiation sources. At present, many direction finding algorithms have been put into practical application. Compared with the spatial spectrum direction-finding algorithm that requires two-dimens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/46
Inventor 马洪朱超谭萍罗冶
Owner HUAZHONG UNIV OF SCI & TECH
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