SMA link double spreading code signal multiplexing method

Abstract

The invention provides an SMA link double spreading code signal multiplexing method, which can significantly improve the relay satellite system S-band phased array multi-access link SMA transmission ability and the multi-target service ability and increase the signal bandwidth utilization rate. According to the technical scheme of the invention, in an uplink modulator at the relay satellite transmitting end, primary spreading code signals generated by N paths of array elements are subjected to secondary spreading treatment to generate double spreading code signals, one path of single-carrier reference signals generated by a crystal oscillator are subjected to the same spreading treatment, the N paths of array elements of double spreading code signals which keep synchronization are additively synthesized into one path of signals; and a relay satellite ground receiving system guides the N paths of secondary spreading signals to despread through firstly despreading the reference signals, the signals are combined into one path of signals through a digital beam synthesizer, the synthesized one path of signals are outputted to a baseband of the receiving end for primary spreading signal dispreading and demodulation, and each path of array element signals is restored.

Description

technical field [0001] The invention relates to a method for multi-channel double spread spectrum transmission processing in the field of phased array multiple access (SMA) link transmission. Background technique [0002] In the relay satellite system (TDRSS), in order to improve its service capability, it is necessary to increase the S-band phased array multiple access (SMA) system. In the SMA, the phased array antenna on the relay satellite is used to realize the forward and backward multi-target Simultaneous measurement and control. The forward link of the SMA system in the three generations of TDRSS that has been built in the United States adopts an open-loop method to realize the phase shifting of the RF phase shifters of the S-band phased array antennas on the relay satellite through ground transmission control commands. The beam is aimed at the target that needs to be tracked, so that in the forward link, it can only serve different users in a "time-division" manner. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method that can save frequency resources, increase signal bandwidth, improve signal processing gain, and solve the problems of limited frequency band, limited bandwidth, and insufficient spread spectrum gain of the existing spread spectrum code signal frequency division transmission processing method. Can improve the S-band phased array multiple access link SMA transmission capability and multi-target service capability of the relay satellite system, flexible, convenient, reliable, and a double spread spectrum code signal transmission processing method that can reprocess the spread spectrum code signal

Images