A DAC-based Method for Generating Transmit Waveform of Radar Digital T/R Module

Abstract

The invention relates to a method for generating a transmitting waveform of a radar digital T / R component based on a DAC, and belongs to the technical field of phased array radar digital wave generation. It includes six steps, adding the baseband carrier waveform on the basis of the digital waveform directly generated by the digital-to-analog converter DAC, effectively widening the bandwidth of the digital signal; introducing additional frequency points + data generated by the NCO in the field programmable gate array FPGA The analog-to-analog converter DAC generates a stable frequency point near the required frequency point, ensuring the accuracy of all frequency points within the radar transmission bandwidth, and at the same time improving the radar frequency point switching rate; the operation is simple and convenient, and the digital T / R component can Generates transmission waveforms with accurate frequency points, fast frequency point switching and phase switching speeds, diverse waveforms, stable phases, and large bandwidths. It solves the problem that the digital signal bandwidth of the transmitted waveform is relatively narrow due to its own characteristic defects of the digital-to-analog converter DAC, the frequency division point within the transmission bandwidth is inaccurate, and the frequency conversion speed is slow.

Description

technical field [0001] The invention relates to a method for generating a transmitting waveform of a radar digital T / R component based on a DAC, and belongs to the technical field of phased array radar digital wave generation. Background technique [0002] In phased array radar, more and more digital T / R components use the digital-to-analog converter DAC to generate multi-frequency point transmission waveforms. The transmission waveform of the digital-to-analog converter DAC is generated by the control of the control chip FPGA through the DAC chip. The working mode, frequency point, phase and bandwidth control of the digital T / R component are carried out through the DAC chip receiving the control command of the control chip FPGA. The communication mode is generally SPI communication mode. In addition, the output frequency point, waveform, phase and bandwidth are also It can be directly controlled by the control chip FPGA; however, there are some disadvantages in using the di...

AI Technical Summary

Problems solved by technology

[0004] Second, part of the frequency points generated by the digital-to-analog converter DAC itself has a shift of about 3 Hz, and some of the frequency points generated by itself are inaccurate;

[0005] Third, the digital-to-analog converter DAC needs to receive the frequency conversion command sent by the control chip FPGA to change the frequency point, which makes the frequency conversion speed slow

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