A method for improving the anti-interception probability between a satellite and an underwater moving target

Abstract

The invention discloses a method for improving the anti-interception probability between a satellite and an underwater moving target, which adopts a multi-satellite combined scanning mode and a multi-aperture diversity receiving mode of the underwater moving target. Multi-satellite joint scanning can reduce the interception rate by reducing the light energy emitted from each satellite on the premise that the same light intensity is received by the receiving underwater moving target. Multi-aperture diversity reception on the submarine can combine the light energy of multiple satellites downstream to reach the threshold intensity required by the detector, thus ensuring the success of signal reception under the condition of multi-satellite combination scanning weak signal. The advantages of this scheme are mainly embodied in two aspects: when the total energy received by multi-satellite diversity is larger than that received by traditional single-satellite diversity scheme, the signal-to-noise ratio is improved; in multi-satellite and multi-propagation paths, there is the probability of satellite failure or optical path blocking, and the diversity reception of multi-path is not affected by the loss of individual links, which improves the probability of link connection.

Description

technical field [0001] The invention is applicable to the field of blue-green laser communication between satellites and underwater moving targets, and is a method for improving the anti-interception probability of links between satellites and underwater moving targets. Background technique [0002] Modern communication technology is quite mature, but microwave means should still be used to realize long-distance communication underwater. At present, the usual underwater moving target communication method is radio communication, and its main bands include super low frequency (SLF), very low frequency (VLF), low frequency (LF), high frequency (HF), very high frequency (VHF), special High frequency (UHF) and microwave frequency bands (SHF and EHF) for satellite communications, etc. [0003] The traditional way of microwave communication to underwater moving targets will face the following problems: [0004] 1) The underwater moving target regularly floats to the leakage depth...

AI Technical Summary

Problems solved by technology

This method greatly restricts the mobility of underwater moving target communication

[0005] 2) Underwater moving target communication uses ultra-low frequency communication, but the communication rate is extremely low

In actual use, due to the influence of various factors such as atmospheric turbulence, sea surface reflection, and underwater channel attenuation, the transmitted optical power required for star-diving blue-green laser communication is relatively large, so there are hidden dangers that are easily exposed