Quick direction finding method for correlation interferometer

A correlative interferometer and fast technology, which is applied in direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve problems such as large amount of calculations, achieve less algorithm steps, high direction finding accuracy, and simple implementation Effect

Inactive Publication Date: 2012-10-24
THE PLA INFORMATION ENG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention proposes a fast direction finding method of a correlation interferometer, which solves the problem of large amount of computation in the direction measurement of a traditional correlation interferometer

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  • Quick direction finding method for correlation interferometer
  • Quick direction finding method for correlation interferometer
  • Quick direction finding method for correlation interferometer

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Embodiment 1

[0029] Embodiment one: if figure 1 As shown, the fast direction finding method of the correlation interferometer of the present invention follows the basic structure of the traditional correlation interferometer, and realizes the fast direction finding of the correlation interferometer through the improvement of the digital signal processing method in the signal receiver, and its steps include:

[0030] Step 110, before the receiver starts to work, first perform the initialization operation, calculate the multi-channel steering vector corresponding to the azimuth angle of 0°~180° and each elevation angle according to the angle interval required by the direction finding user, and normalize it based on a certain channel storage after processing;

[0031] Step 120, performing orthogonal digital down-conversion processing on the wireless signals of each channel received by the receiver, and then obtaining a low-IF complex signal or a zero-IF complex signal after preprocessing such...

Embodiment 2

[0033] Embodiment two: see figure 1 , the fast direction finding method of the correlation interferometer of the present embodiment is different from the first embodiment in that in step 110 and step 130, the multi-channel steering vector and the multi-channel complex signal are normalized according to the following principles:

[0034] 1) The reference channel numbers of the multi-channel steering vector and the multi-channel complex signal must be consistent;

[0035] 2) Normalize the data of each channel. In actual operation, the complex division is replaced by multiplication, and the data of each channel is multiplied by the conjugate of the reference channel data, that is, only the phase of the data is normalized.

Embodiment 3

[0036] Embodiment three: see figure 1 The fast direction finding method of the correlation interferometer of the present embodiment is different from the second embodiment in that in step 130, the calculation process of the correlation coefficient between the normalized multi-channel steering vector and the multi-channel complex signal includes: 1 ) The real part of the channel data corresponding to the normalized steering vector and the normalized complex signal is multiplied by the real part, and the imaginary part is multiplied by the imaginary part; 2) The product of the real part and the real part of each channel minus the product of the imaginary part and the imaginary part, and then the channel The results are added together, the absolute value is calculated, and the calculation result is recorded as the correlation coefficient a between the current external wireless signal and the steering vector; 3) The product of the real part and the real part of each channel plus th...

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Abstract

The invention relates to a communication signal processing technology, in particular to a quick direction finding method for a correlation interferometer. The quick direction finding method for a correlation interferometer comprises the following steps of: (1) firstly, calculating multichannel steering vectors corresponding to 0-180 DEG azimuth angle and each elevation angle according to an angle interval required by a direction finding user, normalizing the steering vectors by taking one channel as a reference, and storing the normalization result; (2) receiving multichannel external wireless signals, and performing orthogonal digital down conversion on each channel wireless signal to obtain a low intermediate frequency complex signal or zero intermediate frequency complex signal; and (3) normalizing the obtained low intermediate frequency complex signal or zero intermediate frequency complex signal according to the reference used by the steering vectors, calculating the coefficient of correlation between the complex signal and a prestored steering vector in each direction, and determining the direction of an external wireless signal according to the coefficient of correlation. With the quick direction finding method, the direction of a spatial signal can be obtained through fewer calculations under the condition of not changing array compositions. The quick direction finding method has fewer calculation steps, easiness in realization and high direction finding accuracy.

Description

technical field [0001] The invention relates to a communication signal processing technology, in particular to a fast direction finding method of a correlation interferometer. Background technique [0002] Radio direction finding has a very wide application value in both military and civilian fields, and plays an important role in aspects such as radar navigation, sonar, and mobile communication. The interferometer mainly calculates the direction of the radio wave by measuring the complex voltage distribution between the array elements of the antenna array. This type of algorithm has the advantages of short processing time and mature technology, and has been widely used in the direction finding and positioning of radiation sources. [0003] The traditional phase interferometer directly uses the phase difference formed by the radio wave at the direction-finding limit to determine the incoming wave direction. The direction finding speed is fast and the realization is simple....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14
Inventor 张莉王成王大磊王斌吴江唐涛
Owner THE PLA INFORMATION ENG UNIV
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