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Satellite channel high dynamic time delay Doppler simulation system

A technology of satellite channel and analog system, applied in the field of satellite communication, can solve the problems of analog time delay, small Doppler range, low change speed, etc.

Active Publication Date: 2020-04-24
CHANGGUANG SATELLITE TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that the simulation time delay and Doppler range of the existing channel simulator are small and the changing speed is low

Method used

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  • Satellite channel high dynamic time delay Doppler simulation system
  • Satellite channel high dynamic time delay Doppler simulation system
  • Satellite channel high dynamic time delay Doppler simulation system

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specific Embodiment approach 1

[0034] Specific implementation mode 1. Combination Figure 1 to Figure 8 Description of this embodiment, a satellite channel high dynamic delay Doppler simulation system, including a radio frequency input unit, a down conversion unit, an AD conversion unit, a static delay control unit, a dynamic delay control unit, and a Doppler frequency shift simulation unit, upper computer parameter control unit, radio frequency output unit, up-conversion unit and DA conversion unit.

[0035] The input port of the radio frequency input unit is an SMA radio frequency input interface, the down conversion unit directly converts the radio frequency input to zero intermediate frequency, and the AD conversion unit performs data sampling and AD conversion.

[0036] FPGA integrates static delay control unit, dynamic delay control unit and Doppler frequency shift simulation unit;

[0037] The static delay control unit uses FPGA to communicate with external DRAM for data exchange, and can achieve a ...

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Abstract

The invention discloses a satellite channel high-dynamic time delay Doppler simulation system, relates to the technical field of satellite communication, and solves the problems of small simulation time delay and Doppler range and low change speed of an existing channel simulator. The system comprises an input unit, an FPGA control unit, an upper computer parameter control unit and an output unit.The FPGA control unit comprises a static time delay control unit, a dynamic time delay control unit and a Doppler frequency shift simulation unit; the FIFO function realized on the basis of the external DRAM memory structure can be subjected to large-range time delay; hardware adopts a PXI architecture, multi-channel expansion is realized, and a plurality of board cards are triggered in a daisy chain form. The fractional delay filter based on the least square method ensures accurate delay control in a large bandwidth range; Doppler and time delay continuous changes are supported; Doppler andtime delay joint synchronous control; a speed-adjustable control mode is updated based on the digital NCO parameters; and the satellite channel high-dynamic time delay Doppler simulation system can beexpanded into a multi-channel structure, and multiple channels can be accurately synchronized.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a satellite channel high dynamic delay Doppler simulation system. Background technique [0002] In the design, development and testing stages of the satellite communication system, it is necessary to simulate the channel of the satellite communication and analyze the actual communication performance of the satellite in orbit. For satellite communications, the cost of channel testing in the actual environment is high, and it is almost difficult to realize. Therefore, it is necessary to use a channel simulation system to test the performance of satellite communications. At the same time, because the satellite is in high-speed motion all the time, the characteristics of the satellite channel are also changing all the time. Long distance satellite communication, fast satellite movement, large delay, and high dynamics are the most important characteristics of satellit...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04B17/00
CPCH04B7/1851H04B17/0087
Inventor 鲍大志刁国影邢斯瑞陈悦李玲
Owner CHANGGUANG SATELLITE TECH CO LTD
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