To solve the problem that the helmet-mounted display is not so comfortable for wearing, we put forward a method to replace the cable with wireless communication technology.Taking the small cockpit environment as the object for study, we analyzed the transmission characteristics of the wireless signal in the cockpit space, and proposed a new Doppler shift expression based on Jakes model together with the head movement regularity of the pilot.Simulation was made with Matlab to analyze the performance of the improved Jakes model.The simulation results show that:the autocorrelation function curve and cross-correlation function curve of the improved Jakes model is more close to the theoretical value, which has better second-order statistics, and is applicable for modeling of the wireless channel.