Being the main radio short-range navigation system in our army, and enabling to realize the point source positioning with reliable performance, TACAN system, the only traditional land\|based radio navigation system, plays an important role in route navigation and homing guidance. Under the current realistic conditions that anti interference is poor and anti destruction ability is weak in the application of satellite navigation system, it is urgent and realistic to develop and make good use of TACAN system to improve its navigation and positioning accuracy and make it a radio navigation means with high positioning accuracy and wide coverage. Taking developing and utilizing the TACAN system as a premise to backup means that there is a quite good precision in navigating and positioning. By analyzing the ranging technology implementation ways and performance indexes of other navigation and positioning systems, the code related ranging methods and implementation technologies of TACAN system are studied, and the simulation analysis is carried out in the aspects of signal format, ranging accuracy and impact on system performance.The effect of ranging by using new coded signal is helpful to improve the tactical and technical performance of TACAN navigation system, and can also be used for the development demonstration of TACAN system equipment, and provide reference for the new generation of ranging technology.