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Radio Frequency Measurement Method and Device Based on Optical Sampling

A technology of radio frequency and measurement device, applied in the field of radio frequency measurement method and device based on optical sampling, can solve the problems of difficulty in practicality, dynamic range, broadband fading, high power consumption of synchronization circuit, etc., and achieves large dynamic range and bandwidth, The effect of large modulation dynamic range and real-time accurate measurement

Inactive Publication Date: 2015-08-26
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of this technology are: on the one hand, the traditional microwave frequency measurement system targets bits instead of information, resulting in excessive "information redundancy" and waste of functions; Fading, etc., and cause "information distortion"
[0015] 1) Expensive cost: This technology requires parallel processing of about 40 channels, and each channel requires a coded signal generator, mixer, filter and ADC, which is almost impossible to achieve
[0016] 2) Difficulty in synchronization: the sampling of multi-channel signals needs to be synchronized, and this kind of multi-channel signal synchronization requires the production of special acquisition cards and synchronization circuits, which are very complicated, and the synchronization circuit consumes a lot of power
[0017] 3) High SWAP: This technology is completed in the electrical domain, and all electronic devices are used, so the SWAP is very high, which is difficult to be practical
[0018] 4) Poor system stability: Since the ADC needs to be determined at the same time for the coding methods of several channels, the technology is unstable, that is, if a device for generating a coded signal fails, the entire algorithm will collapse immediately
[0019] 5) Time-consuming: the algorithm is more complex, the calculation speed is slow, and it is difficult to realize the rapid transition of microwave signals

Method used

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  • Radio Frequency Measurement Method and Device Based on Optical Sampling
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  • Radio Frequency Measurement Method and Device Based on Optical Sampling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Such as Figure 6 As shown, MLL is an active mode-locked laser, MZM is a Mach-Zehnder modulator, and PRBS is a pseudo-random code (a periodic coded signal) generated by a periodic coded signal generator (PRBS itself can also be considered to represent a periodic coded signal generating device), RF is the microwave signal to be measured, PD is the photodetector tube, and ADC is the analog-to-digital converter.

[0093] The MLL produces a short pulse train with a pulse width of 1-2 ps, and the pulse repetition frequency is 10 GHz. The first MZM modulates the PRBS onto the short pulse train produced by the MLL. After the RF is received by the antenna, it is amplified and modulated by the second MZM intensity on the coded short pulse sequence. The coded short pulse sequence carrying the RF signal is then received by the PD. The photocurrent generated by the PD is proportional to the intensity of the photoelectric field it receives. This current is sampled by the subsequen...

Embodiment 2

[0095] Such as Figure 7 As shown, PolM is a polarization modulator, PC is a polarization controller, PBS is a polarization beam splitter, BPD is a balanced detector, and other components are the same as in Embodiment 1.

[0096] Before the coded light pulse sequence enters the PolM, the PC is adjusted so that the incident light is linearly polarized and the angle between the polarization state and the polarization axis of the PolM is 45°. At the PolM output, two phase-modulated signals with orthogonal polarization states and opposite modulation directions are generated. In this way, incident linearly polarized light is converted into right-handed polarized light. At the second PC, the polarized light is split into two phase-conjugated first polarized lights and separated by the PBS. In this way, at the two output ports of the PBS, the expression of the optical power is

[0097]

[0098] where P in is the optical power of the encoded periodic signal modulated by PRBS, V...

Embodiment 3

[0105] Such as Figure 8 As shown, Switch is an optical switch, and other components are the same as the previous ones. In this scheme, modulation is performed first and then encoding is performed. In Embodiments 1 and 2, encoding is performed before modulation.

[0106] The optical pulse sequence generated by the active mode-locked laser is firstly modulated by the PRBS with a microwave signal, and then passed through the optical switch. The Switch has two output terminals, one output terminal outputs optical signal each time, and the other output terminal does not output signal. The selection of the output terminal is controlled by an external electric signal. Assume that when PRBS is 0, the upper arm of the Switch outputs, and the BPD output current is a microwave signal. When PRBS is 1, the lower arm outputs, and the output of the BPD is the microwave current multiplied by -1. In this way, the output of the BPD is the PRBS signal multiplied by the microwave signal by ±1...

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Abstract

The invention relates to the field of signal detection technology of communication equipment and discloses an optical-sampling-based radio frequency measuring method and a measuring device. The optical-sampling-based radio frequency measuring method includes a first step of pulsing a light source to generate periodic pulse sequences, a second step of modulating the pulse sequences through utilization of periodic coded signals and microwave signals, a third step of detecting processed pulse sequences and converting the pulse sequences into light current, a fourth step of sampling the light current at a speed rate lower than the nyquist bandwidth fixed value of the microwave signals, and a fifth step of processing data obtained through sampling to recover the microwave signals, thereby obtaining the frequency of the microwave signals. The optical-sampling-based radio frequency measuring method and the measuring device can achieve real-time accurate measurement of a plurality of microwave frequencies in a broadband without down-conversion at a low cost and a sampling rate lower than the nyquist bandwidth of the microwave signals.

Description

technical field [0001] The invention relates to the technical field of communication signal detection, in particular to a radio frequency frequency measurement method and device based on optical sampling. Background technique [0002] RF frequency measurement (also known as microwave frequency measurement), that is, to receive useful microwave signals from the complicated electromagnetic environment, process them and distinguish the frequency of the target information, is an important part of the microwave system. It is widely used in communication, signal detection and other fields. [0003] Existing technology 1: traditional microwave frequency measurement system based on electronic devices [0004] The framework of traditional microwave frequency measurement system based on electronic devices is as follows: figure 1 As shown, the wireless radio frequency signal is received by the antenna, amplified and converted by the radio frequency front end, and then output as a bit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
Inventor 戴一堂闫励徐坤伍剑李岩洪小斌郭宏翔左勇林金桐
Owner BEIJING UNIV OF POSTS & TELECOMM
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