U-band microwave direct modulation system

Abstract

A U-band microwave direct modulation system comprises a C-band local oscillation circuit, a C-band amplification circuit, a U-band 8-frequency multiplication circuit, a U-band QPSK microwave direct modulation circuit and a level conversion circuit. The C-band local oscillator circuit takes a high-stability reference source as an input, performs sampling phase locking on the high-stability reference source, and generates C-band carrier waves with extremely low phase noise; the C-band amplifying circuit is used for carrying out power amplification and isolation on the C-band carrier with extremely low phase noise; the U-frequency band 8-frequency multiplication circuit is used for carrying out multiple harmonic frequency multiplication and isolation on the amplified and isolated C-frequencyband carrier wave with extremely low phase noise so as to generate a U-frequency band carrier wave; the level conversion circuit performs bipolar conversion on the external data to obtain bipolar level data; and the QPSK microwave direct modulation circuit of the U frequency band modulates the phase of the carrier of the U frequency band under the data driving of the bipolar level to realize QPSKmodulation so as to obtain a QPSK modulation signal, and the QPSK modulation signal is isolated and then output.

Description

technical field [0001] The invention relates to a U-band microwave direct modulation system, which belongs to the technical field of U-band microwave direct modulation. Background technique [0002] In the field of satellite high-speed data transmission, the traditional frequency is the X-band. With the transmission rate getting higher and higher, the occupied bandwidth is getting higher and higher, and the number of satellites launched by various countries is increasing, the X-band is extremely crowded. At present, the KA frequency band, as the best solution to the X-band frequency conflict, has been more and more used. However, in the face of more and more applications, especially mobile communication satellite constellations, the number of satellites is increasing exponentially. For example, the scale of the Hongyan constellation that is being approved is calculated on the basis of thousands of satellites, which leads to a problem of frequency interference between thousan...

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a U-band microwave direct modulation system, to directly QPSK modulate the data in the U-band, so that the system can transmit data in the new frequency band U-band, and solve the problem of The bottleneck problem of U-band transmission

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