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A satellite channel high dynamic delay Doppler simulation system

An analog system and satellite channel technology, applied in the field of satellite communication, can solve the problems of low change speed, simulation delay and small Doppler range

Active Publication Date: 2021-12-03
CHANGGUANG SATELLITE TECH CO LTD
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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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  • A satellite channel high dynamic delay Doppler simulation system
  • A satellite channel high dynamic delay Doppler simulation system
  • A satellite channel high dynamic 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

A satellite channel high dynamic time delay Doppler simulation system relates to the technical field of satellite communication, and solves the problems that the simulation time delay and Doppler range of the existing channel simulator is small and the change speed is low. Including input unit, FPGA control unit, upper computer parameter control unit and output unit; FPGA control unit includes static time delay control unit, dynamic time delay control unit and Doppler frequency shift simulation unit; the present invention realizes based on external DRAM memory structure The FIFO function can perform a wide range of time delay; the hardware adopts the PXI architecture to realize multi-channel expansion, and trigger multiple boards in the form of a daisy chain. The fractional delay filter based on the least square method ensures precise delay control in a wide bandwidth range; supports continuous change of Doppler and delay; joint synchronous control of Doppler and delay; update rate based on digital NCO parameters Adjustable control mode; it can be expanded to multi-channel structure, and multiple channels can be precisely 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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Patent Type & Authority Patents(China)
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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