DAC-based radar digital T/R component transmission waveform generation method

A technology for transmitting waveforms and generating methods, which is applied in the field of phased array radar digital wave generation, can solve the problems of slow frequency conversion speed and inaccurate partial frequency points, and achieve wide bandwidth, fast frequency switching speed, and accurate frequency points Effect

CN110646784AActive Publication Date: 2020-01-03JINGZHOU NANHU MACHINERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-01-03

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Abstract

The invention relates to a DAC-based radar digital T / R component transmission waveform generation method, and belongs to the technical field of phased array radar digital wave generation. The DAC-based radar digital T / R component transmission waveform generation method comprises six steps, and a baseband carrier waveform is added on the basis of a digital waveform that is directly generated by adigital-to-analog converter DAC to effectively widens the bandwidth of a digital signal; an additional frequency point generated by NCO in a field-programmable gate array FPGA + a stable frequency point in the vicinity of a required frequency point and generated by the digital-to-analog converter DAC are imported to ensure the accuracy of all frequency points in a radar transmission bandwidth, andmeanwhile, the radar frequency point switching rate is improved; the operation and implementation are simple and convenient, and a digital T / R component can generate transmission waveforms with accurate frequency points, high frequency point and phase switching speed, diverse waveforms, stable phase and large bandwidth. The problems that the digital signal bandwidth of the transmission waveform is relatively wide, a part of frequency points in the transmission bandwidth is not accurate, and that the frequency conversion speed is low caused by the own characteristic defects of the digital-to-analog converter DAC are solved.
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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...

Examples

Embodiment Construction

[0031] (see Figure 1~3 ), a DAC-based radar digital T / R component transmission waveform generation method, the hardware includes a debugging computer, a monitoring computer, a monitoring subsystem, a T / R component, and a frequency source, and the debugging computer is a separate computer, which includes a computer hardware platform, Display, keyboard, mouse, USB download cable, the operating system uses WIN7 version, the installation program includes NIOSⅡ12.1, QuartusⅡ12.1, Matlab2014; the monitoring computer is a desktop computer, which includes a human-computer interaction monitoring interface; the monitoring subsystem includes a communication interface board , Optical signal conversion board; T / R assembly includes T / R assembly control board; The hardware of described communication interface board includes Field Programmable Gate Array FPGA, serial memory EPCS, crystal oscillator, optical transceiver module, network communication module, serial port communication module, t...