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Frequency diverse array-multiple-input multiple-output (FDA-MIMO) dimensionality-reduction space-time adaptive clutter suppression method and device based on auxiliary channel

An adaptive clutter and auxiliary channel technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as de-correlation, full space-time adaptive processing, unfavorable engineering implementation, and reduction of signal-to-noise ratio of moving target output.

Active Publication Date: 2019-05-17
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the detection performance of moving targets, space-time adaptive processing (STAP, Space-Time Adaptive Processing) technology is usually used, which combines multiple spatial channels and multiple coherent pulses for two-dimensional adaptive processing, which can effectively Suppressing space-time coupling clutter, thereby improving the detection performance of moving targets, but full space-time adaptive processing is not conducive to engineering implementation, and it is necessary to reduce the system dimension to realize engineering application
[0003] For the dimensionality reduction technology of STAP, the traditional adaptive dimensionality reduction method usually adopts the scheme of selecting samples in the adjacent unit of the current channel, so as to generate the clutter covariance matrix based on the samples of the main channel and the adjacent channel where the target is located, to realize The clutter in the main channel is self-cancelling, but there is a de-correlation phenomenon between the echoes of the adjacent channel and the main channel, resulting in strong clutter remaining when the clutter is adaptively canceled, reducing the output signal-to-noise ratio of the moving target

Method used

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  • Frequency diverse array-multiple-input multiple-output (FDA-MIMO) dimensionality-reduction space-time adaptive clutter suppression method and device based on auxiliary channel
  • Frequency diverse array-multiple-input multiple-output (FDA-MIMO) dimensionality-reduction space-time adaptive clutter suppression method and device based on auxiliary channel
  • Frequency diverse array-multiple-input multiple-output (FDA-MIMO) dimensionality-reduction space-time adaptive clutter suppression method and device based on auxiliary channel

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Embodiment 1

[0030] The embodiment of the present invention expects to provide an FDA-MIMO dimensionality reduction space-time adaptive clutter suppression method based on the auxiliary channel, which can solve the problem of suppressing distance-dependent clutter in the case of non-side-looking FDA-MIMO radar, see figure 1 The flow of the FDA-MIMO dimensionality reduction space-time adaptive clutter suppression method based on the auxiliary channel provided by the embodiment of the present invention may include:

[0031] S101: Perform a range-dependent compensation on the raw data of the FDA-MIMO radar according to the estimated value of the Doppler center of each range unit, and obtain once-compensated data;

[0032] S102: Perform secondary distance-dependent compensation on the primary compensation data according to the step amount of the FDA-MIMO radar transmission signal carrier frequency compared with the reference carrier frequency, to obtain secondary compensation data;

[0033] S1...

Embodiment 2

[0070] Based on the same technical concept as the aforementioned technical solutions, if the above solutions can be implemented in the form of software function modules and are not sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, this implementation The essence of the technical solution of the example or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of software products, and the computer software products are stored in a storage medium, including several instructions for Make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the method described in this embodiment. The aforementioned storage media include: U disk, mobile hard disk, read only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk ...

Embodiment 3

[0073] Based on the same technical idea of ​​the aforementioned technical scheme, see Figure 7 , which shows the specific hardware structure of an auxiliary channel-based FDA-MIMO dimensionality reduction space-time adaptive clutter suppression device 70 provided by an embodiment of the present invention, including: an FDA-MIMO radar antenna 701, a memory 702 and a processor 703 ; each component is coupled together through the bus system 704 . It can be understood that the bus system 704 is used to realize connection and communication between these components. In addition to the data bus, the bus system 704 also includes a power bus, a control bus and a status signal bus. But for clarity, in Figure 5 The various buses are referenced as bus system 704 in FIG. Among them, the FDA-MIMO radar antenna 701 is used for receiving and sending FDA-MIMO radar signals;

[0074] memory 702, used to store computer programs that can run on the processor 703;

[0075] The processor 703...

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Abstract

The embodiment of the invention discloses a frequency diverse array-multiple-input multiple-output (FDA-MIMO) dimensionality-reduction space-time adaptive clutter suppression method and device based on an auxiliary channel. The FDA-MIMO dimensionality-reduction space-time adaptive clutter suppression method can comprises the steps that original data of an FDA-MIMO radar are subjected to primary distance dependence compensation according to Doppler center estimate values of all distance units, and thus primary compensation data are obtained; the primary compensation data are subjected to secondary distance dependence compensation according to the step quantity of the transmitted signal carrier frequency of the FDA-MIMO radar relative to the reference carrier frequency, and thus secondary compensation data are obtained; the secondary compensation data are converted to a Doppler-transmitting-receiving space frequency domain along a clutter ridge, and thus converted data of the Doppler-transmitting-receiving space frequency domain are obtained; an adaptive clutter suppression weight vector is obtained according to the converted data and the minimum variance constraint theory; and the converted data are subjected to clutter suppression according to the adaptive clutter suppression weight vector, and thus output data after clutter suppression are obtained.

Description

technical field [0001] The present invention relates to radar signal processing technology, in particular to a frequency diversity array multiple input multiple output (FDA-MIMO, Frequency Diverse Array-Multiple-Input Multiple-Output) dimensionality reduction space-time adaptive clutter suppression method based on an auxiliary channel and equipment. Background technique [0002] Due to the movement of the platform where the airborne or spaceborne radar is located, its main lobe and side lobe clutter will be diffusely distributed in a certain Doppler frequency range, thus submerging the moving target that the radar is interested in. In order to improve the detection performance of moving targets, space-time adaptive processing (STAP, Space-Time Adaptive Processing) technology is usually used, which combines multiple spatial channels and multiple coherent pulses for two-dimensional adaptive processing, which can effectively The space-time coupling clutter can be suppressed to...

Claims

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Application Information

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IPC IPC(8): G01S7/41
Inventor 文才彭进业
Owner NORTHWEST UNIV
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