Doppler frequency shift device and Doppler frequency shift testing device and method for communication module
A technology of Doppler frequency shift and communication module is applied in the field of Doppler frequency shift test device, which can solve the problems such as inconvenience of Doppler frequency shift test, and achieve the effects of cost reduction, convenient use and cost saving.
Active Publication Date: 2013-04-24
NAT UNIV OF DEFENSE TECH
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[0005] The purpose of the present invention is to provide a Doppler frequency shifter and a Doppler frequency shift testing device and method of a communication module with simple structure and convenient application, so as to solve the technical problem that the Doppler frequency shift test of the existing communication module is inconvenient
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[0043] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.
[0044] see figure 1 , the Doppler frequency shifter 1 of the present invention includes a dual-channel intermediate frequency signal source 2 , a first mixer 3 , a low-pass filter 4 and a second mixer 5 . Among them, the intermediate frequency signal source 2 is used to set the Doppler frequency shift value f D , output an intermediate frequency signal F 2 as the second RF signal F r2 , and output the sum of the intermediate frequency signal and the Doppler frequency shift value F 2 +F D as the first RF signal F r1 ; The first mixer 3 is used to receive the input signal F IN , and the input signal F IN with the first RF signal F r1 The frequency mixing is the sum signal F of the two IN +F r1 and difference signal FI N -F r1 The mixed sig...
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The invention discloses a Doppler frequency shift device and a Doppler frequency shift testing device and a method for a communication module. The Doppler frequency shift device comprises a two-channel medium frequency signal source, a first mixer, a low pass filter and a second mixer, wherein the two-channel medium frequency signal source outputs an intermediate frequency signal as a second radio-frequency signal according to a setting Doppler frequency shift value, and outputs the sum of the intermediate frequency signal and the Doppler frequency shift value as a first radio-frequency signal; the first mixer is used for receiving an input signal, and mixing the input signal and the first radio-frequency signal as a mixed signal of a sum signal and a different signal of the input signal and the first radio-frequency signal; the low pass filter is used for removing the sum signal in the mixed signal, and reserving the different signal; and the second mixer is used for mixing the different signal outputted from the low pass filter and the second radio-frequency signal and result that the input signal is carried out with Doppler frequency shift is achieved. The Doppler frequency shift device and the Doppler frequency shift testing device and the method for the communication module can imitate the Doppler frequency shift produced in a communication process, structure is simple and use is convenient.
Description
technical field [0001] The invention relates to the field of space wireless communication, in particular to a Doppler frequency shifter and a Doppler frequency shift testing device and method for a communication module. Background technique [0002] When measuring and researching wireless communication between two terminals in relative motion, it is necessary to consider the influence of Doppler frequency shift on the communication signal. Especially in satellite communication, since the non-stationary satellite itself also has a very high speed, it is necessary to fully consider the impact of the "Doppler effect" on various problems in communication. [0003] Since the Doppler frequency shift is generated in high-speed relative motion, it is not easy to test, so the Doppler frequency shifter is generally used to simulate the Doppler frequency shift value to test the influence of the Doppler frequency shift on the communication module. In particular, when applying industria...
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IPC IPC(8): H04B17/00H04B7/01
Inventor 陈利虎宋新赵勇杨磊刘鹏飞程云姚雯
Owner NAT UNIV OF DEFENSE TECH