Test system and test method for testing phase coherent properties of radio frequency signals
A technology for characteristic testing and radio frequency signals, which is applied to the phase coherent characteristic test system and testing field of radio frequency signals. Wide and stable effect
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specific Embodiment 1
[0029] A radio frequency signal phase coherent characteristic test system, including a connected high-speed digital sampling system and a vector signal analysis system; also includes a broadband frequency conversion system; the broadband frequency conversion system includes sequentially connected broadband frequency source, mixing module and low-pass filter module; the low-pass filter is connected with the high-speed digital sampling system; the detected input signal enters the high-speed digital sampling system after passing through the frequency mixing module and the low-pass filter module in sequence.
[0030] Its testing process is:
[0031] Step 1. The detected signal enters the frequency mixing module, and under the action of the broadband frequency source and the frequency mixing module, the frequency down-conversion of the input signal is completed;
[0032] Step 2. The down-converted signal is low-pass filtered by the low-pass filter module, and the required analog si...
specific Embodiment 2
[0035] like figure 2 As shown, on the basis of the specific embodiment 1, a signal conditioning module connected to the frequency mixing module is also included, and the detected input signal first passes through the signal conditioning module and then enters the frequency mixing module. In the test process, the detection signal is subjected to signal conditioning, amplification and filtering, and then sent to the mixing module.
specific Embodiment 3
[0036] On the basis of the specific embodiment 1, the broadband frequency conversion system is a broadband multi-channel frequency conversion system; the frequency mixing module includes more than two mixers, corresponding to more than two input channels; the broadband frequency source Connected to each mixer; the low-pass filter module includes more than two low-pass filters, which are connected to more than two mixers in one-to-one correspondence; the high-speed digital sampling system consists of a multi-channel analog-to-digital conversion system constitute. Including the input path of more than two detected signals, the phase coherence characteristic test is performed on more than two detected signals at the same time.
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