Abstract
For satellite or aircraft networks, tracking, telemetry, and control (TT&C) and data transmission between different nodes are necessary. Traditional measurement mostly adopts the frequency division duplex (FDD) mode and uses a continuous measurement system to achieve high-precision measurement. However, as the number of network nodes increases, the mode suffers from complex frequency domain allocation, and high-cost measurement and data transmission equipment is required. This paper proposes the integrated signal in time division duplex (TDD) mode to improve frequency utilization to address these circumstances. The proposed signal can transmit the TT&C and data at the same frequency. In addition, the high-precision time-frequency synchronization and relative measurement technology in the TDD mode for distributed spacecraft or aircraft networks are studied. The simulation results show that the signal can work normally when the Doppler extrapolation error is less than a quarter of the integration frequency. The distance extrapolation error should be less than a quarter of the length of a chip. The integrated signal reduces the frequency band occupation and realizes the integration of TT&C and data transmission. In addition, the measurement performance is reduced by only 2~3 dB compared with that of the traditional pure TT&C signal.
Highlights
In traditional satellite network systems, the responsibilities of the intersatellite link (ISL) are divided into two independent functions, TT&C and data transmission; that is, the data transmission link and TT&C link are undertaken by two independent sets of equipment [1,2]
The major contributions of this article are as follows: (1) Considering the lack of spectrum resources, this paper proposes the BOCcos and amplitude-phase shift keying (APSK) integrated signal to achieve TT&C and data transmission services
Based on the slit-spectrum characteristics, binary offset carrier (BOC) and APSK signals are proposed to be used in the design of the TT&C and data transmission integrated signal
Summary
In traditional satellite network systems, the responsibilities of the intersatellite link (ISL) are divided into two independent functions, TT&C and data transmission; that is, the data transmission link and TT&C link are undertaken by two independent sets of equipment [1,2]. Because the transponder cannot receive the signal during the transmission period, the tracking loop is interrupted periodically With these observations in mind, in this paper, we increase the utilization of the frequency band by using an integrated signal and the TDD mode. Considering those advantages, we adopt 16APSK as the modulation mode of the data transmission signal. (1) Considering the lack of spectrum resources, this paper proposes the BOCcos and APSK integrated signal to achieve TT&C and data transmission services. (2) Considering the shortage of frequency resources in the case of large numbers of nodes, we propose the high precision measurement method for the TDD mode.
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