Research and Design of Multi-Channel Telemetry Signal Digital Baseband Transmitter and Receiver Module

Abstract

In order to realize a system of multi-channel telemetry signal transmitter and receiver module, a design for generating encryption and decryption processing signals in the transmitting module and the receiving module is proposed on the baseband signal processing hardware platform. For the generation of the single-bit telemetry control signal, the idea of using dual-port RAM sequential logic and combinational logic circuits is adopted in the FPGA module, and sorting processing is performed in the DSP module. Combined with embedded system and software radio design, the software design based on C programming language and QUTUS II system simulation are given. The design has passed the hardware and software joint debugging, and can pull up the single-bit telemetry control signal corresponding to the position of the data stream in the case of up to 300 key contents for encryption and decryption processing. Introduction The main task of radio telemetry is to realize the transmission of long-distance radio signals, thereby completing tasks such as spatial measurement, information transmission and storage by means of remote detection. Spacecraft, aircraft and near-ground space drones are typical radio telemetry applications. With the continuous development of radio information communication technology, telemetry technology and means at home and abroad have also made great progress. In order to realize the information transmission between the aerial near-ground aircraft and the ground, this topic is based on the standardized software and hardware platform design, using programmable devices and intelligent hardware systems to realize the construction of a new radio multi-channel telemetry system and software radio platform upgrade [1]. This has become one of the important ways to achieve high-speed wireless data transmission in the field of contemporary telemetry technology. In order to realize efficient and reliable information transmission of the radio multi-channel telemetry system, the quality of the communication channel and information security have received great attention. Therefore, telemetry information transmission and reception needs to follow a certain communication protocol, and at the same time, in order to ensure information security, it is necessary to have certain encryption and decryption processing capabilities. The PCM modulation method is widely used in remote telemetry communication systems because of its high precision and strong anti-interference ability [2]. Therefore, the design adopts PCM modulation mode and adopts time division multiple access modulation mode to realize telemetry and remote control of multi-channel signals. On the basis of ensuring reliable transmission of telemetry data, the security of data transmission is considered, that is, the encryption and decryption of telemetry information [3]. Therefore, it is necessary to generate a specified encryption and decryption key in the master PC, that is, to encrypt or decrypt the specified data stream. To this end, this paper combines the processing of data transmission and encryption and decryption, proposes a multi-channel telemetry signal transceiver module based on FPGA/DSP and related control signal generation scheme, and realizes multi-channel telemetry baseband digital signal transmission and reception through hardware joint adjustment. 2nd International Conference on Electrical and Electronic Engineering (EEE 2019) Copyright © 2019, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Engineering Research, volume 185