Aiming at the supply chain security risks and technical bottlenecks caused by the import of key components of domestic instrument landing system （ILS）, this paper proposes a design scheme of ILS signal transmitting unit based on all-domestic chips. The design adopts domestic FPGA and DDS technology to realize the high-precision generation of 90, 150 Hz single tone signals and 1 020 Hz Morse code identification signals. Digital-to-analog conversion of baseband signal is completed by domestic DAC, and CSB/SBO signal synthesis is realized by I/Q modulation architecture combined with RF carrier generated by frequency source devices. The power dynamic regulation is completed by combining digital attenuator and high linear power amplifier. Finally, according to the multi-environment test and comparative analysis with foreign mainstream equipment, it shows that its technical indicators meet the requirements of ICAO Annex10. In this study, the full-link localization scheme of ILS signal transmitting unit from FPGA to RF front-end is initially realized, which provides practical reference for the autonomous and controllable technical path of aviation navigation equipment.