Digital radio frequency memory based on analogue demodulation/modulation

Abstract

The invention discloses a digital radio frequency memory based on analogue demodulation / modulation. The digital radio frequency memory is provided with an FPGA (Field Programmable Gate Array), a FLASH, an RAM (Random Access Memory), A / Ds (Analog to Digital) and D / As (Digital to Analog) of a line I and a line Q, and a low pass filter, wherein the FLASH and the RAM are respectively connected with the FPGA through data lines; the A / D and the D / A of the line I and the line Q are respectively connected with the FPGA through data lines; the low pass filter is respectively connected with the D / As of the line I and the line Q. According to the digital radio frequency memory disclosed by the invention, the bandwidth which is better than 400MHz and the dynamic state which is better than 40dB are realized and the digital radio frequency memory can be applicable to radar signals of various systems; the digital radio frequency memory has the capability of improving the quality of a copying signal through using a sample screening technology and a sample frequency spectrum purification technology; a coherent interference signal can be generated through carrying out multi-pulse tracking and stable tracking on a target signal and an output signal can be subjected to normalization and peak-to-average ratio improvement treatment; the efficiency of interference is greatly improved and the digital radio frequency memory can be widely applied to various types of radar jammers.

Description

technical field [0001] The invention relates to a digital radio frequency memory based on analog demodulation / modulation, and its main application involves the fields of electronic countermeasures, signal simulation and the like. Background technique [0002] Digital radio frequency memory is mainly used in the field of electronic countermeasures and signal simulation. Its basic function is to perform analog-to-digital conversion on the input analog signal, store the digital signal, properly process the digital signal, and digitally process the processed digital signal. Mod conversion. The existing digital radio frequency memory basically only has storage function and a small amount of interference modulation function, and lacks signal detection function, repetition frequency tracking function, signal spectrum purification function, power normalization function, output signal peak-to-average ratio improvement function, etc. Therefore, the radio frequency memory also needs c...

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Problems solved by technology

However, this invention only verified the analysis conclusions in the paper through numerical simulation, and did not complete the design and verification on the hardware

[0005] 2. Wang Yuepeng and Huang Jianchong proposed a method of using radio frequency memory to realize PD radar synchronous deception jamming (Wang Yuepeng et al., PD radar synchronous deception jamming method based on radio frequency memory, Flying Missile, 2004, (12): 57-60); but the invention is limited to For the discussion of PD radar synchronous deception jamming, the applicable objects are not universal, and the main indicators are low, the instantaneous working bandwidth is 200MHz, and the dynamic range is 20dB

[0009] At present, there are many journal papers and few invention patents on digital radio frequency memory for radar jamming. The main characteristics of the relevant literature are: (1) only discusses the hardware design of digital radio frequency memory, but does not discuss how the jamming method is implemented in the hardware (2) Only a certain interference method is discussed, and the applicable objects are not universal; (3) The main performance indicators are not high enough to meet the complex electromagnetic environment

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