Vehicle-mounted Ku wave band satellite communication small-bore antenna system

Abstract

The invention discloses a vehicle-mounted Ku wave band satellite communication small-bore antenna system which comprises an antenna reflecting surface, a feed source, an LNB (low noise block downconverter), a receiving-transmitting duplexer, an antenna controller, and the like. A one-to-two shunt is arranged on a bottom plate of an antenna rotating platform, and output signals of the LNB are divided into two paths through the one-to-two shunt, wherein one path of signals are transmitted to a satellite beacon receiver for tracking the antenna, while the other path of signals are transmitted to a modulator-demodulator through a waveguide / coaxial rotary joint. After the antenna is started, the antenna automatically searches the satellite, i.e. carries out open loop tracking, and once the antenna finds the satellite, the antenna carries out close loop tracking. The invention has compact and simple structure, light weight of the whole antenna system and fast response. An adopted three-dimensional coordinate system is a dynamic coordinate system moving along with the antenna, and a piezoelectric type angular rate sensor is respectively arranged on the three coordinate axes so as to ensure that the antenna is exactly aligned to the satellite.

Description

technical field [0001] The invention belongs to satellite communication antenna technology, in particular to a vehicle-mounted Ku-band satellite communication small-diameter antenna system. Background technique [0002] It is an important part of the development of satellite communication that the car body communicates with the satellite while moving (communication in motion). In recent years, there have been many reports about vehicle-mounted satellite communication antennas, but most of them are explained from the general principles and indicators, and there are very few real objects. At present, domestic manufacturers with relatively mature design and manufacture of vehicle-mounted satellite communications basically adopt the tracking method of "single pulse + optical gyro strapdown guidance platform" (see the 54th Institute of China Electronics, the 39th Institute of China Electronics, and the 13th Institute of China Aerospace for details. website product introduction)....

AI Technical Summary

Problems solved by technology

Although the "single pulse + optical gyro strapdown guidance" tracking method can theoretically eliminate the angular displacement and have high tracking accuracy, due to the inertia of the antenna rotation, the high-precision sensor cannot overcome the inertia of the antenna in an instant. Only an optical gyro costs at least 100,000 RMB, and its cost-effectiveness is low when used on a small-caliber (antenna diameter < 0.9m) antenna for vehicle-mounted satellites.

The feed source is complicated when using monopulse tracking, the monopulse signal processing circuit is complex, the weight of the antenna system used is > 50 kg, and the power consumption is > 300W

The result is low reliability and high cost

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