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Correlation interferometer real-time direction finding method based on channelization processing

A correlative interferometer and channelization technology, applied to direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve problems such as real-time direction finding that is not suitable for multiple burst signals, and many calculation steps

Pending Publication Date: 2021-09-10
嘉兴军创电子科技有限公司
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Problems solved by technology

Although this method can improve the accuracy of direction finding, it has many operation steps and is not suitable for real-time direction finding of multiple burst signals.

Method used

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  • Correlation interferometer real-time direction finding method based on channelization processing
  • Correlation interferometer real-time direction finding method based on channelization processing
  • Correlation interferometer real-time direction finding method based on channelization processing

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Embodiment 1

[0042] like figure 1 A real-time direction-finding method based on channelization processing for correlation interferometers is shown, comprising the following steps:

[0043] S1. Establish a first-level phase difference vector sample library divided into intervals at a certain angular interval for all sub-channels and a second-level phase difference vector sample library at a certain angular interval under each interval;

[0044] S2. Perform digital channelization processing on multi-channel input signals, and simultaneously obtain baseband IQ signals of sub-channels;

[0045] S3. Perform channel phase difference calculation and channel energy calculation on the baseband IQ signal of the sub-channel to obtain the phase difference vector and signal amplitude of the sub-channel;

[0046] S4. Correlate the phase difference vector samples of the first-level phase difference vector sample library with the phase difference vector of the corresponding sub-channel, search for the mi...

Embodiment 2

[0051] A method for real-time direction finding of a correlation interferometer based on channelization processing, comprising the following steps:

[0052] S1. Establish a first-level phase difference vector sample library divided into intervals by a certain angular interval for all sub-channels and a second-level phase difference vector sample library with a certain angular interval under each interval; the first-level phase difference vector sample library includes n of the interval angle θ phase difference vector samples, wherein θ*n=360 °; the secondary phase difference vector sample library includes p phase difference vector samples of interval angle A, wherein p=θ / A, and the value range of A is 0.5 °~3 °;

[0053] S2. carry out digital channelization processing to multi-channel input signal, obtain the baseband IQ signal of sub-channel, digital channelization processing adopts following formula:

[0054]

[0055] In the formula, y k (m) is the output of the kth chan...

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Abstract

The invention provides a correlation interferometer real-time direction finding method based on channelization processing. The correlation interferometer real-time direction finding method comprises the following steps: establishing a first-level phase difference vector sample library with intervals divided at certain angle intervals and a second-level phase difference vector sample library with certain angle intervals in each interval for all sub-channels; performing digital channelization processing on the multi-channel input signal; performing channel phase difference calculation and channel energy calculation; carrying out correlation calculation, searching a minimum value calculated at the time, and recording an incident angle index value of a current sub-channel signal; and determining a value interval of the secondary phase difference vector sample library, performing correlation calculation on a phase difference vector sample in the value interval of the secondary phase difference vector sample library and a phase difference vector of the current sub-channel, searching a minimum value calculated at the time, and converting the minimum value into an index value to obtain a signal incident angle. According to the invention, the two-stage operation strategy is adopted to carry out correlation calculation and the large-scale parallel pipeline is adopted to accelerate the operation speed, so that the real-time direction finding of short-time burst signals in a broadband frequency band is realized.

Description

technical field [0001] The invention relates to a direction finding method of a correlation interferometer, in particular to a real-time direction finding method of a correlation interferometer based on channelization processing. Background technique [0002] Correlative interferometer direction finding is a kind of phase direction finding method, which has high precision and sensitivity, can obtain azimuth and elevation angle information at the same time, is suitable for various antenna array forms, and because of correlation processing, it can avoid ordinary phase interferometer It is one of the most widely used direction finding systems because of the phase ambiguity problem existing in it. [0003] Correlative interferometer direction finding needs to correlate the measured phase difference with the phase difference in the sample library, and the amount of calculation is relatively large, especially when performing direction finding of broadband frequency band burst sign...

Claims

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 张峻涛吴海斌肖君辉张江豪贾博文杭冬生
Owner 嘉兴军创电子科技有限公司
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