Field programmable gate array (FPGA) implementation equipment and method for self-adaptive clutter suppression of external radiation source radar

An external radiation source radar and adaptive clutter technology, applied in the field of radar, can solve the problems of large hardware resources, unable to meet real-time requirements well, and achieve the effect of saving hardware resources

Active Publication Date: 2013-11-20
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem that the traditional clutter suppression requires a large amount of hardware resources and cannot meet the real-time requirements well

Method used

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  • Field programmable gate array (FPGA) implementation equipment and method for self-adaptive clutter suppression of external radiation source radar
  • Field programmable gate array (FPGA) implementation equipment and method for self-adaptive clutter suppression of external radiation source radar
  • Field programmable gate array (FPGA) implementation equipment and method for self-adaptive clutter suppression of external radiation source radar

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Experimental program
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Effect test

Embodiment 1

[0057] In view of the fact that the electromagnetic environment has become more and more complex in recent years, and in the context of the needs of the information battlefield, the application of external radiation source radar is more extensive. The external radiation source radar has two antennas. Among the signals received by the main antenna, there are not only target echo signals, but also direct wave signals and interference signals. The power of the signal reflected by the target is relatively weak, and at the same time, the strong direct wave signal leaked from the direct wave channel is mixed in the target echo receiving channel, which will inevitably drown out the real target position information. If you do not try to remove the mixed direct wave signal in the target echo, then the target echo will not be detected. The clutter suppression module is a module specially used to remove the direct wave signal in the target echo in the external radiation source radar syste...

Embodiment 2

[0066] The FPGA implementation device and method for the adaptive clutter suppression of the external radiation source radar are the same as in the first embodiment.

[0067] For the FPGA implementation method of adaptive clutter suppression for external radiation source radar, see figure 1 , including the following steps:

[0068] Step 1: Select the required FPGA chip, determine the model of the required FPGA chip according to the data volume and speed requirements that the radar system needs to process, and put it into the radar processing system of the external radiation source to receive the channelized four-way data. position, replacing the DSP chip in the traditional processing method. The adaptive clutter suppression module formed by the FPGA chip works together with the existing system to form a complete radar signal processing system.

[0069] Traditional external radiation source radar adaptive clutter suppression requires multiple DSP chips to work together, which...

Embodiment 3

[0088] The device and method for realizing the adaptive clutter suppression of the external radiation source radar by FPGA are the same as those in Embodiment 1-2.

[0089] see figure 2 , as can be seen from the flowchart of the adaptive clutter suppression module of the present invention, the specific implementation of the adaptive clutter suppression module is as in step 3. Five global clocks are set in the adaptive clutter suppression module formed by the FPGA chip, and the radar is set For the number of clutter suppression weights in the system, the channelized four-way data is input to the FIR filter module for filtering through the FIFO memory inside the FPGA chip, and at the same time, the two-way data of the auxiliary antenna is input to the step calculation module to calculate the new The step size is to update the weight in the weight update module by the output of the FIR filtering module and the step size calculation module, and complete an adaptive filtering.

...

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Abstract

The invention discloses field programmable gate array (FPGA) implementation equipment and an FPGA implementation method for self-adaptive clutter suppression of external radiation source radar. The method comprises the following steps of inputting four paths of channelized data to be processed into a finite impulse response (FIR) filter module through a first in first out (FIFO) memory inside a self-adaptive clutter suppression module of an FPGA chip; inputting two paths of data, channelized by an auxiliary antenna, into a step length calculation module through the FIFO memory, and calculating the step length through the step length calculation module; simultaneously inputting the output of the step length calculation module and two paths of output of the FIR filter module into a weight updating module; inputting an updated weight into the FIR filter module; and performing synchronous parallel output on clutter suppression results through in-phase/quadrature (I/Q) channels. The self-adaptive clutter suppression is controlled by five global clocks with the same rate and different phases. The self-adaptive clutter suppression of the external radiation source radar can be better realized. The problem of difficulty in meeting of a requirement on real-time performance caused by large conventional clutter suppression equipment amount is solved. The equipment and the method are high in processing efficiency, high in calculation speed and low in equipment complexity, and are used for implementing the self-adaptive clutter suppression of the external radiation source radar.

Description

technical field [0001] The invention belongs to the technical field of radar, and mainly relates to the processing of radar echo signals, in particular to an FPGA implementation device and method for adaptive clutter suppression of external radiation source radar. The echo signal received in the external radiation source radar is processed by FPGA Based on the method, adaptive sidelobe cancellation is carried out to achieve the purpose of clutter suppression. technical background [0002] The external radiation source radar refers to the radar that does not emit electromagnetic waves itself, but uses the electromagnetic waves reflected by the target to locate and track it. In modern warfare, the development of electronic technology has brought serious threats to active radar. There are four main threats: electronic jamming, ultra-low altitude penetration, anti-radiation missiles and stealth technology. [0003] Since the external radiation source radar itself does not emit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
Inventor 王俊周伟伟朱昀刘杰董晓男杨杰
Owner XIDIAN UNIV
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