A Multi-feed Satellite Spectrum Sensing Method Based on Angle Reciprocity
A multi-feed satellite and spectrum sensing technology, applied in the field of multi-feed satellite spectrum sensing based on angle reciprocity, can solve the problems of low cost performance and high computing cost
Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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Problems solved by technology
When performing spectrum sensing, if DOA estimation is performed first, a large amount of computing cost is required. Using the costly DOA results for spectrum sensing can improve detection performance, but the cost performance is not high.
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[0061] The invention provides a multi-feed satellite spectrum sensing method based on angle reciprocity. The multi-feed satellite receiving end has M receiving feed sources, and the multi-feed multi-beam satellite can be equivalent to a multi-antenna satellite. Then the satellite end signal reception as figure 2 shown. The central angle of the beam coverage is ω, and the offset between the signal arrival angle and the beam coverage middle angle is θ, then the actual signal arrival angle can be expressed as:
[0062]
[0063] The noise obeys a cyclic complex Gaussian distribution with a certain variance and known, that is,
[0064] see image 3 , a kind of multi-feed satellite spectrum sensing method based on angle reciprocity of the present invention, comprises the following steps:
[0065] S1. After filtering and sampling the continuous sensing data received by M receiving feeds at the multi-feed satellite receiving end, an M-dimensional baseband equivalent discrete-...
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The invention discloses a multi-feed source satellite spectrum sensing method based on angle reciprocity. M multi-feed source satellite receiving ends receive continuous sensing data received by a feed source, and a M-dimensional baseband equivalent discrete-time signal column vector Y is obtained after filtering sampling; a spectrum sensing problem is simplified to a binary presumptive model according to the obtained baseband equivalent discrete-time signal vector Y; according to an angle reciprocity rule, a known wave beam is used for covering an intermediate angle omega and generating a data preprocessing matrix; the preprocessing matrix is used for processing the baseband equivalent discrete-time signal vector Y; a sum of the data energy after preprocessing is used as a detecting statistics; the detecting statistics is compared with a threshold, a sensing spectrum is judged, and spectrum sensing is completed. The multi-feed source satellite spectrum sensing method based on angle reciprocity in the invention facilitates subsequent software-based processing. Through the design, the sensing performance of the scheme can be greatly improved according to an angle reciprocity rule and on the basis of increasing few calculated amounts.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a multi-feed satellite spectrum sensing method based on angle reciprocity. Background technique [0002] With the development of communication technology, the service coverage of the ground mobile communication network has been able to extend to most land areas, but due to the influence of factors such as geography and operating costs, there are still many blind spots in the coverage area, which cannot satisfy people's real-time communication. In these areas, satellite mobile communication technology has unique advantages. Therefore, the idea of space-space integration has been proposed, and the satellite mobile communication system is an effective supplement to the ground mobile communication system. At the same time, in wars and major natural disasters, the ground mobile communication system is extremely vulnerable to damage, and the satellite mobile communi...
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IPC IPC(8): H04B17/382H04B17/336
CPCH04B17/336H04B17/382
Inventor 范建存班勇张莹罗新民
Owner XI AN JIAOTONG UNIV