Relay repeater system for unmanned helicopter

Abstract

The invention discloses a relay transmitting system used for an unmanned helicopter, which rises the height of the unmanned helicopter to promote the transmission quality of signals in a spatial channel, and can transmit the relay with a weak signal even in the distance, thus increasing the communication distance; the invention is characterized by high sensitivity, wide dynamic range, broad transmitting band and good anti-interference performance. The invention comprises two main parts of an airborne part and a ground part, wherein, the airborne part is carried with a relay transmitting subsystem and consists of four modules of an airborne receiving antenna, an airborne relay transmitting module, a broad band filter and an airborne transmitting antenna; and the ground part comprises a ground receiving subsystem including three modules of a ground receiving antenna, a vehicle low noise amplifier and a ground receiving module. The system of the invention is simple, high-efficient and reliable and has low cost. By combining with the flexibility and mobility of the unmanned helicopter, the system of the invention can be applied in the fields of television and broadcasting, etc.

Description

technical field [0001] The invention relates to a relay and forwarding system for an unmanned helicopter, and belongs to the field of unmanned helicopter relay systems. Background technique [0002] Ultra High Frequency (UHF for short) and Very High Frequency (VHF for short) frequency bands are common frequency bands in various countries. This frequency band is widely used in the fields of television, FM radio, radar, navigation and short-distance communication. Due to the high frequency of the UHF / VHF band, direct transmission is mainly used for space transmission, so the transmission distance is limited. [0003] 1. Characteristics of UHF / VHF signal space propagation [0004] Due to the frequency characteristics of UHF / VHF band signals, there are two main propagation modes when transmitting in the atmosphere: the linear propagation mode in free space within the line of sight and the scattering and diffraction propagation mode outside the line of sight. [0005] (1) Strai...

AI Technical Summary

Problems solved by technology

[0009] 2. The height of the antenna is increased to extend the propagation distance

[0016] 2. Any communication transceiver has a limited distance. If you want to expand the communication distance, you can use the method of increasing the power of the transmitter and increasing the dynamic range of the receiver, but the cost performance is low. The more economical and simple way is to set up a relay station , to extend the communication distance

Images