To solve the problem of spectrum resource scarcity in aeronautical data link,L-band digital aeronautical communi-cations system(L-DACS)will be deployed as an inlay system in the spectral gaps between channels of the distance measuring equipment(DME).Therefore,it's unavoidable that the DME signal has a severe influence on the perfor-mance of L-DACS system receiver.To analyze the influence of out-of-band leakage of DME/N(distance measure equipment/normal)and DME/P(distance measure equipment/precision)signal on L-DACS system receiver,the mathematical models of DME/N and DME/P signal are established,firstly.Then,the expressions of power spectral density of DME/N and DME/P signal are theoretically derived.Based on these expressions,the effect of out-of-band leakage of DME/N and DME/P signal on L-DACS receiver,which is deployed in adjacent channel,are researched.Finally,the correctness of the theoretical analysis results is verified through computer simulation.The results show that the impact of out-of-band leakage of DME signal on L-DACS system is mainly manifested in the first adjacent channel,and the leakage power of DME/P signal in the first adjacent channel is 10 dB higher than that of DME/N signal.
L-band digital aeronautical communications systemdistance measure equipmentadjacent channel interfer-encepower spectrumout-of-band leakage power
维普
万方数据
