The Design of Pseudo-random Anti-jamming electromagnetic Transmitter Based on ARM_FPGA

摘要

Based on the invert-repeated m-sequence pseudo-random signal’s anti-jamming character on geophysical electromagnetic method,we proposed using ARM_FPGA to design invert-repeated m-sequence pseudo-random anti-jamming electromagnetic transmitter.The transmitter is made up by low-voltage part and high-voltage part.The low voltage part is composed of ARM control platform and digital logic programming device FPGA.The high voltage part is composed of IGBT switch and its driving module.The specific workflow is as follows.ARM platform controls FPGA to generate PWM signals,then the signals pass through high-speed optocouplers and are switched to high-voltage section.The PWM signals drive the IGBT driving module to control the IGBT switches turn-on and turn off,so as to realize the transmit signals.After the transmitter function is realized,the transmitter is tested.During the tests,the voltage emitted is up to 800V and the corresponding current emitted is 3.84A,and the transmitter can work for several hours.Then we change the resistance load,the voltage is 200V and the corresponding current is up to 20A.The tests show that the transmitter design is feasible,and can achieve high voltage and high current power supply,has good application prospect.