Electronic reconnaissance signal parameter high-precision measurement method based on FPGA

Abstract

The invention discloses an electronic reconnaissance signal parameter high-precision measurement method based on an FPGA, and the method comprises the following steps: inputting two parameters, i.e.,a detection threshold setting mode and a fixed threshold value, into an upper computer, and transmitting the parameters to the FPGA through PCIe; processing the radar reconnaissance signal by an analog-to-digital converter to obtain an original digital signal, and transmitting the original digital signal to an FPGA for multi-channel data caching; performing framing processing on the original digital signal, and performing short-time Fourier transform on each frame of data; calculating a frequency power spectrum of the frequency domain data, selecting a peak value of the frequency power spectrum, comparing the peak value with a judgment threshold, and judging whether a target signal exists or not; and measuring pulse signal parameters of an enemy radar for the frequency domain data with thetarget signal. By adopting frequency domain pulse detection, the precision of parameters such as pulse width, pulse repetition period and the like can be effectively improved; through the rough measurement and accurate measurement of the frequency spectrum, a frequency spectrum measurement result with relatively high precision can be obtained at relatively low resource cost, and the real-time performance is good.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to an FPGA-based high-precision measurement method for electronic reconnaissance signal parameters. Background technique [0002] In modern warfare, the effective means of obtaining enemy intelligence is electronic reconnaissance. Its biggest feature is to use electronic technology to detect enemy radar parameters to obtain important information. Its working principle is to intercept electromagnetic signals in space, and measure typical parameters of electromagnetic pulses through preprocessing (amplification, down conversion, etc.) and subsequent signal processing. Due to the competition between the enemy and the enemy for the dominance in the war, higher requirements are put forward for the real-time performance of the reconnaissance system and the accuracy of the measured enemy radar parameters. Therefore, it is necessary to study the high-precision parameter measuremen...

AI Technical Summary

Problems solved by technology

However, some platforms based on high-speed devices have the disadvantages of complex hardware design and difficult development. The algorithms used are also difficult to program or have limited accuracy improvement. These shortcomings or problems have increased the difficulty of reconnaissance aircraft design and development. cycle

Images