Network modulation method for deep space communication

Abstract

The invention relates to the field of deep space communication, and especially relates to a network modulation method for deep space communication. On the basis of deep space direct transmission communication, the method selects a proper relay satellite to form a three-point type cooperative communication topological structure, selects a proper modulation type matching ratio according to the channel characteristics of three different links, employs the technology of network modulation to transmit detection data, improves the effectiveness of communication under the condition of guaranteeing that the stability is within a certain range, and improves the throughput capacity. According to the invention, the technology of network modulation is applied to the deep space communication, thereby enabling the throughput capacity of a system to be 20%-27% more than the throughput capacity while the direct transmission link modulation is employed, enabling the throughput capacity of the system to be 14%-25% more than the throughput capacity while the single-relay double-jump link modulation technology is employed, and effectively improving the throughput capacity of the system.

Description

technical field [0001] The invention relates to the field of deep space communication, in particular to a network modulation method oriented to deep space communication. Background technique [0002] 1. Characteristics of deep space communication [0003] In the process of deep space exploration, deep space communication plays a key role. Only by ensuring the normal operation of the deep space communication system can the deep space exploration mission be successful, and deep space communication faces the challenges of ground communication and satellite communication. This is because the deep space channel has the following characteristics: long distance, long delay, channel fading characteristics, high operating frequency, available frequency bandwidth, easy link interruption, asymmetric uplink and downlink, etc. . [0004] The propagation distance of deep space communication is extremely long, and the signal energy attenuates with the square of the deep space detection d...

AI Technical Summary

Problems solved by technology

First, the modulation transmission method of the direct transmission link gives up the effectiveness in order to obtain higher reliability, but due to the limited memory capacity of the deep space detector, the lower effectiveness will inevitably lead to a low transmission rate, which will make the detector The collected data cannot be sent back to the earth in time. If the capacity of the detector is full at this time, the data cannot be collected further, or in order to continue collecting data, the data in the detector can only be discarded, but the data collected by the deep space detector Both are very precious. The above two methods will lose valuable data. Obviously, it is unscientific to do so.

Second, the transmission mode of two-hop links with a single relay can shorten the transmission distance of each link and improve the SNR of each link. Under the condition of ensuring reliability, the method of hopping link modulation has limited ability to improve system effectiveness, that is, compared with direct transmission modulation link, the percentage of system throughput improvement is not large

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