Multi-mode microwave optical fiber relay transmitting quality judging subsystem for launching site

Abstract

The invention discloses a multi-mode microwave optical fiber relay transmitting quality judging subsystem for a launching site. The multi-mode microwave optical fiber relay transmitting quality judging subsystem mainly comprises a multi-channel spectrum spreading multiplexed signal source, a power amplifier, an S wave band down converter, an S wave band signal preprocessor, five signal analyzer processors, a signal evaluation computer, a portable debugging terminal, a remote control terminal, an evaluation monitoring terminal, a multi-channel signal monitoring control computer, a sending antenna and a receiving antenna. The multi-mode microwave optical fiber relay transmitting quality judging subsystem has the advantages that the frequency spectrum of multi-channel signals can be straightforwardly displayed through signal pre-processing, down conversion and digital signal processing, an operator can evaluate the signal quality according to the system, pointed regulation as well as regulation and control on the pre-processing equipment can be received through antennas, so that the multi-channel signals can be balanced, the requirement that ground equipment can be demodulated can be met, and then the condition that the system can change from the debugging state to the working state in the shortest time can be ensured.

Description

technical field [0001] The invention relates to the technical field of ground measurement, launch and control systems at launch sites, in particular to a multi-mode microwave optical fiber relay and forwarding quality judgment subsystem at launch sites. Background technique [0002] At present, in the long-distance measurement and launch of the launch site, the existing microwave optical fiber forwarding system is developed according to the frequency division forwarding system, that is, the transmission of multiple signals uses the method of frequency division multiplexing, and different signals occupy different frequency points. The multi-channel measurement and control and data transmission signals of the satellite all use different frequency points, and the passbands of each signal have a certain isolation. test requirements. [0003] Due to the change of the communication system, multiple satellites are required to complete the same frequency and simultaneous forwarding...

AI Technical Summary

Problems solved by technology

In the past, signal differentiation by frequency and space isolation methods could not solve this problem

Second, the amplitude-frequency characteristics of signals transmitted by different satellites are not easy to guarantee

The signal amplitude difference of different satellite signals should not be too large, otherwise the ground equipment will not be able to demodulate normally after the interference of the same frequency is too strong

Third, when the spread spectrum system is forwarded, the existing equipment cannot monitor the signal, which is not conducive to real-time debugging on site

When the satellite telemetry signal is transmitted using the spread spectrum system, the working frequency bands of multiple signals are the same, and general equipment such as spectrum analyzers used in the debugging process cannot distinguish the spectrum characteristics of each satellite

In addition, interface matching is not easy to guarantee, and the interface requirements between multiple satellites are different. The existing forwarding system cannot guarantee to meet the requirements of multiple satellites at the same time.

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