Satellite-borne data transmission transmitter using microwave direct modulation technique

Abstract

The invention provides a satellite-borne data transmission transmitter using a microwave direct modulation technique. A shell is a cuboid structure, the upper and lower surfaces thereof are both provided with sunken shielding grooves, and outer side of the upper surface of the shell is anticlockwise provided with a frequency source, a first isolator, a microwave modulator, an exciting amplifier, a band-pass filter, a solid state power amplifier, and a second isolator in sequence. A coding circuit is located in a single shielding groove in the centre of the upper surface of the shell, the frequency source and the first isolator are arranged in the same shielding groove, the microwave modulator and the exciting amplifier are arranged in the same shielding groove, and the shielding covers of the three shielding groove are top cover plates of a first machine case. A power amplifier and the second isolator are arranged in the same shielding groove, the shielding cover is the top cover plate of a second machine case, and an output filter is located above the solid state power amplifier and fixed above the top cover plate of the second machine case. A 38-core electric connector is mounted on the side wall of the shell. A power supply circuit is arranged on the lower surface of the shell. The data transmission transmitter in the invention has small volume, light weight and strong electromagnetic compatibility, and is conveniently disassembled.

Description

technical field [0001] The invention belongs to the field of microwave communication, and relates to a spaceborne digital transmission transmitter. Background technique [0002] With the development of satellite communication technology, the requirements for the development of space-borne communication equipment are also continuously increasing, such as micro-satellites or deep-space communication equipment, the requirements for the volume, weight, and power consumption of space-borne equipment are becoming more and more stringent. [0003] The digital transmitter is an important space-borne communication device. Its main task is to pass the image data or scientific data and engineering telemetry parameters observed by the payload through its antenna system when the satellite passes through a certain visible arc of the ground receiving station. sent back to the ground. At present, the digital transmission transmitters commonly used in orbiting satellites mostly adopt the in...

AI Technical Summary

Problems solved by technology

At the same time, in order to meet the electromagnetic compatibility performance of the digital transmission transmitter, it is required that the connection between the multi-layers is tight and there is no leakage. Therefore, the processing accuracy of the chassis connection structure is high, the processing technology is complicated, and the production cycle is long.

In addition, the multi-layer structure has many assembly and disassembly procedures and complex connections, especially after the whole machine is assembled, such as debugging a certain layer of local circuits, it is necessary to disassemble all the structures above this layer, which requires a large amount of assembly and disassembly work. Easy to debug and reduce the reliability of the equipment

Under the constraints of structural strength, rigidity, and space anti-radiation environment of the chassis, it is difficult to realize the lightness and miniaturization of the equipment with the multi-layer structure

Therefore, although the data transmission transmitter using the multi-layer structure microwave direct modulation technology has been greatly reduced in volume and weight compared with the data transmission transmitter using the intermediate frequency modulation scheme, it still cannot meet the light and small requirements of the current small satellites. requirements

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