阅读说明：本技术 一种w波段空间场幅相测试系统 (W-waveband space field amplitude-phase test system ) 是由 周翼鸿 任光源 李�浩 于 2020-03-12 设计创作，主要内容包括：本发明公开了一种W波段空间场幅相测试系统,属于微波信号测量技术领域。该系统包括频率源模块、扩频模块、幅相检测模块、信号处理模块；频率源模块用于产生两路相干射频信号和两路相干本振信号；扩频模块将相干射频信号和相干本振信号经过倍频混频后产生第一中频信号、第二中频信号,第一中频信号和第二中频信号进入幅相检测模块提取幅度和相位信息,最后进入信号处理模块进行数据处理。本发明对幅度的检测范围可以达到60dB,对相位的检测范围可以到达360°,具有结构简单、易于实现、成本低廉、使用方便的优点。(The invention discloses a W-band space field amplitude-phase test system, and belongs to the technical field of microwave signal measurement. The system comprises a frequency source module, a spread spectrum module, an amplitude and phase detection module and a signal processing module; the frequency source module is used for generating two paths of coherent radio frequency signals and two paths of coherent local oscillator signals; the spread spectrum module generates a first intermediate frequency signal and a second intermediate frequency signal after carrying out frequency multiplication and mixing on the coherent radio frequency signal and the coherent local oscillator signal, the first intermediate frequency signal and the second intermediate frequency signal enter the amplitude-phase detection module to extract amplitude and phase information, and finally enter the signal processing module to carry out data processing. The invention can reach 60dB for amplitude detection range and 360 degrees for phase detection range, and has the advantages of simple structure, easy realization, low cost and convenient use.)

1. A W-band space field amplitude and phase test system comprises a frequency source module, a spread spectrum module, an amplitude and phase detection module and a signal processing module;

the frequency source module is used for generating two paths of coherent radio frequency signals: the first radio frequency signal, the second radio frequency signal, two paths of coherent local oscillator signals: a first local oscillator signal and a second local oscillator signal;

the spread spectrum module is used for receiving two paths of coherent radio frequency signals and two paths of coherent local oscillator signals generated by the frequency source module; the frequency spreading module comprises a first radio frequency multiplier, a second radio frequency multiplier, a first local oscillator frequency multiplier, a second local oscillator frequency multiplier, a first frequency mixer, a second frequency mixer, a first attenuator, a second attenuator, a Low Noise Amplifier (LNA), a device to be tested (DUT), a first filter and a second filter; the first radio frequency signal received by the frequency spreading module sequentially enters a first radio frequency multiplier, a first attenuator, a device to be tested DUT and a low noise amplifier LNA, and then is mixed with a first local oscillation signal passing through the first local oscillation frequency multiplier in a first mixer to generate a first intermediate frequency signal IF1, and the first intermediate frequency signal IF1 enters an amplitude-phase detection module after being filtered by a first filter; the second radio-frequency signal received by the frequency spreading module sequentially enters a second radio-frequency multiplier and a second attenuator, and then is mixed with a second local oscillator signal passing through the second local oscillator frequency multiplier in a second mixer to generate a second intermediate-frequency signal IF2, and the second intermediate-frequency signal IF2 enters an amplitude-phase detection module after being filtered by a second filter;

the amplitude and phase detection module is used for receiving the first intermediate frequency signal IF1 and the second intermediate frequency signal IF2 generated by the spread spectrum module; the amplitude and phase detection module comprises a CHIP CHIP1, a CHIP CHIP2, a 90-degree electric bridge and a power divider; the first intermediate frequency signal IF1 is used as a test signal and is divided into two paths of signals by a 90-degree bridge: the first test signal S1, the second test signal S2, and the second intermediate frequency signal IF2 are used as reference signals, and are directly divided into two paths of signals with the same phase by a power divider: a first reference signal L1, a second reference signal L2; the first test signal S1 and the first reference signal L1 are simultaneously inputted into the CHIP1 for comparison, generating a first amplitude signal P1 and a first phase signal Φ 1; the second test signal S2 is phase-shifted by 90 degrees and then input into the CHIP2 simultaneously with the second reference signal L2 for comparison, generating a second amplitude signal P2 and a second phase signal Φ 2; then inputting a first amplitude signal P1, a first phase signal phi 1, a second amplitude signal P2 and a second phase signal phi 2 into the signal processing module;

the signal processing module comprises a conversion module and a data processing module, wherein the conversion module is used for performing analog-to-digital conversion on the first amplitude signal P1, the first phase signal phi 1, the second amplitude signal P2 and the second phase signal phi 2 generated by the amplitude-phase detection module, and then sending the signals into the data processing module for processing, so that the amplitude and phase distribution of the near field of the device to be tested is obtained.

2. The W-band spatial field amplitude-phase test system according to claim 1, wherein the frequency source module includes a crystal oscillator, a first frequency synthesizer, a second frequency synthesizer, a first power divider, and a second power divider, the crystal oscillator is configured to generate two identical fixed-frequency signals, and one of the fixed-frequency signals passes through the first frequency synthesizer to output a radio-frequency signal with a desired frequency and power; the other path of signal with fixed frequency passes through a second frequency synthesizer to output a local oscillator signal with required frequency and power; the radio frequency signal is divided into two paths of coherent radio frequency signals through the first power divider: a first radio frequency signal and a second radio frequency signal; the local oscillator signal is divided into two paths of coherent local oscillator signals through a second power divider: the first local oscillator signal and the second local oscillator signal.

Technical Field

The invention belongs to the technical field of microwave signal measurement, and particularly relates to a W-band space field amplitude-phase test system.

Background

Modern communication technology is rapidly developed, so that frequency spectrum resources are more and more precious, and the communication industry is promoted to continuously explore higher signal frequency to solve the problem of frequency spectrum congestion. Meanwhile, modern communication systems require higher data transmission rate and higher traffic density, and the communication frequency is also promoted to be continuously increased. Thus, the application of W-band electronics is straightforward. With the increasing maturity of semiconductor technology in recent years, W-band electronic devices and products are becoming more practical and widespread, and W-band related technologies have been applied to the fields of foreign object detection, cloud and rain detection, precision guidance, electronic countermeasure, radar imaging, and the like. In the production and development of W-band devices, the amplitude and phase of plane waves in the near field need to be measured.

The amplitude-phase test is the measurement of amplitude and phase, and is widely used in many fields such as communication, electronics, materials, military affairs, etc. Early amplitude and phase testing techniques include slot line method, bridge method, modulated subcarrier method, etc. These systems are simpler, but they have poor test sensitivity, measurement accuracy, dynamic range, and measurement real-time. In recent years, network analyzers have been developed based on the swept frequency reflectometer technology. It includes Scalar Network Analyzers (SNAs) and Vector Network Analyzers (VNAs). Scalar network analyzers can measure the modulus of parameters such as network reflection and transmission coefficients, such as the early HP85025 model. The vector network analyzer can measure the amplitude and the phase at the same time, and parameters of the vector network analyzer in various aspects such as the testing frequency range, the testing power range, the testing precision and the like are continuously developed. At present, a millimeter wave vector network analyzer is mainly adopted for W-band amplitude-phase testing, such as a PNA (peptide nucleic acid) series vector network analyzer of Germany technology company and an R & SZVA series vector network analyzer of Roder and Schwarz company in the United states.

Although these devices have the advantages of wide frequency range, high accuracy, high degree of intelligence, fast testing speed, large dynamic range, etc., they also have the problems of high price, complex operation and large volume.

Disclosure of Invention

The invention aims to provide a W-band space field amplitude-phase testing system which can improve the defects of the prior art and has the advantages of simple structure, easiness in implementation, low cost and convenience in use.

The invention is realized by the following technical scheme.

A W-band space field amplitude and phase test system comprises a frequency source module, a spread spectrum module, an amplitude and phase detection module and a signal processing module.

The frequency source module is used for generating two paths of coherent radio frequency signals: the first radio frequency signal, the second radio frequency signal, two paths of coherent local oscillator signals: the first local oscillator signal and the second local oscillator signal.

The spread spectrum module is configured to receive two paths of coherent radio frequency signals and two paths of coherent local oscillator signals generated by the frequency source module, mix the first radio frequency signal and the first local oscillator signal into a first intermediate frequency signal IF1, and mix the second radio frequency signal and the second local oscillator signal into a second intermediate frequency signal IF 2.

The amplitude and phase detection module is used for receiving the first intermediate frequency signal IF1 and the second intermediate frequency signal IF2 generated by the frequency spreading module and respectively generating a first amplitude signal P1, a first phase signal phi 1, a second amplitude signal P2 and a second phase signal phi 2;

the signal processing module comprises a conversion module and a data processing module, wherein the conversion module is used for performing analog-to-digital conversion on the first amplitude signal P1, the first phase signal phi 1, the second amplitude signal P2 and the second phase signal phi 2 generated by the amplitude-phase detection module, and then sending the signals into the data processing module for processing, so that the amplitude and phase distribution of the near field of the device to be tested can be obtained.

Further, the frequency source module includes a crystal oscillator, a first frequency synthesizer, a second frequency synthesizer, a first power divider, and a second power divider, where the crystal oscillator is configured to generate two paths of same fixed-frequency signals, and one path of the fixed-frequency signals passes through the first frequency synthesizer to output radio-frequency signals with required frequency and power; the other path of signal with fixed frequency passes through a second frequency synthesizer to output a local oscillator signal with required frequency and power; the radio frequency signal is divided into two paths of coherent radio frequency signals through the first power divider: a first radio frequency signal and a second radio frequency signal; the local oscillator signal is divided into two paths of coherent local oscillator signals through a second power divider: the first local oscillator signal and the second local oscillator signal.

Further, the spread spectrum module comprises a first radio frequency multiplier, a second radio frequency multiplier, a first local oscillator frequency multiplier, a second local oscillator frequency multiplier, a first mixer, a second mixer, a first attenuator, a second attenuator, a Low Noise Amplifier (LNA), a Device Under Test (DUT), a first filter and a second filter; the first radio frequency signal received by the frequency spreading module sequentially enters a first radio frequency multiplier, a first attenuator, a device to be tested DUT and a low noise amplifier LNA, and then is mixed with a first local oscillation signal passing through the first local oscillation frequency multiplier in a first mixer to generate a first intermediate frequency signal IF1, and the first intermediate frequency signal IF1 enters an amplitude-phase detection module after being filtered by a first filter; the second radio frequency signal received by the frequency spreading module sequentially enters a second radio frequency multiplier and a second attenuator, then is mixed with a second local oscillator signal passing through the second local oscillator frequency multiplier in a second frequency mixer to generate a second intermediate frequency signal IF2, and the second intermediate frequency signal IF2 enters an amplitude-phase detection module after being filtered by a second filter.

Further, the amplitude and phase detection module comprises a CHIP CHIP1, a CHIP CHIP2, a 90-degree bridge and a power divider; the first intermediate frequency signal IF1 is divided into two signals by a 90-degree bridge: the first test signal S1, the second test signal S2, and the second intermediate frequency signal IF2 are used as reference signals, and are directly divided into two paths of signals with the same phase by a power divider: a first reference signal L1, a second reference signal L2; the first test signal S1 and the first reference signal L1 are simultaneously inputted into the CHIP1 for comparison, generating a first amplitude signal P1 and a first phase signal Φ 1; the second test signal S2 is phase-shifted by 90 degrees and then input into the CHIP2 simultaneously with the second reference signal L2 for comparison, generating a second amplitude signal P2 and a second phase signal Φ 2; then inputting a first amplitude signal P1, a first phase signal phi 1, a second amplitude signal P2 and a second phase signal phi 2 into the signal processing module;

the invention has the beneficial effects that:

the invention adopts a first frequency synthesizer to generate two paths of coherent radio frequency signals: the first radio frequency signal, the second frequency synthesizer generates two coherent local oscillator signals: a first local oscillator signal and a second local oscillator signal; the frequency-doubled first radio-frequency signal passes through a device to be tested DUT and then is mixed with the frequency-doubled first local oscillator signal to generate a first intermediate-frequency signal, the frequency-doubled second radio-frequency signal is mixed with the frequency-doubled second local oscillator signal to generate a second intermediate-frequency signal, the first intermediate-frequency signal and the second intermediate-frequency signal are compared in the amplitude-phase detection module to obtain amplitude and phase information of the device to be tested, the amplitude-phase detection module is wide in amplitude and phase detection range, the amplitude detection range can reach 60dB, and the phase detection range can reach 360 degrees.

The invention adopts a modularized connection mode, has wide measurable frequency range, can measure the W wave band, and can measure the corresponding frequency band only by replacing the frequency multiplier and the frequency mixer of the corresponding frequency band.

Compared with the traditional vector network analyzer, the vector network analyzer is low in cost and simple to operate.

Drawings

FIG. 1 is a block diagram of the system of the present invention;

fig. 2 is a schematic block diagram of a magnitude-phase detection module.

Detailed Description

The invention will be further illustrated and described in detail with reference to the following figures and examples.

Fig. 1 is a system block diagram of a system according to the present invention, and fig. 1 shows that a W-band spatial field amplitude-phase test system according to the present invention is characterized by comprising a frequency source module, a spreading module, an amplitude-phase detection module, and a signal processing module.

As shown in fig. 1, the frequency source module includes a crystal oscillator, a first frequency synthesizer, a second frequency synthesizer, a first power divider, and a second power divider; for generating two coherent radio frequency signals: the first radio frequency signal, the second radio frequency signal, two paths of coherent local oscillator signals: the first local oscillator signal and the second local oscillator signal.

The first frequency synthesizer is used for providing radio-frequency signals for the spread spectrum module, the output frequency range is 10MHz-15GHz, the second frequency synthesizer is used for providing local oscillator signals for the spread spectrum module, the output frequency range is 10MHz-15GHz, and the first power divider and the second power divider are both 3dB power dividers.

As shown in fig. 1, the spectrum spreading module is configured to receive two coherent radio frequency signals and two coherent local oscillator signals generated by the frequency source module, mix the first radio frequency signal and the first local oscillator signal into a first intermediate frequency signal IF1, and mix the second radio frequency signal and the second local oscillator signal into a second intermediate frequency signal IF 2.

Because two paths of signals are needed for comparison in the amplitude and phase tests, the spread spectrum module is divided into two paths: the reference channel mixes the second radio frequency signal and the second local oscillator signal into a second intermediate frequency signal IF2, and the test channel mixes the first radio frequency signal and the first local oscillator signal into a first intermediate frequency signal IF 1. The reference channel comprises a second radio frequency multiplier, a second local oscillator frequency multiplier, a second attenuator, a second mixer and a second filter, the test channel comprises a first radio frequency multiplier, a first local oscillator frequency multiplier, a first attenuator, a device to be tested DUT (device under test), a low noise amplifier LNA (low noise amplifier), a first mixer and a first filter, and the frequency multipliers, the mixer, the attenuator and the filter used by the two channels are kept consistent.

The frequency multiplier is used for multiplying the frequency of a radio frequency signal and a local oscillator signal to the frequency range of a device to be tested DUT, the output frequency range of the frequency multiplier is 75GHz-110GHz, the mixer is used for mixing the frequency of the radio frequency signal and the local oscillator signal and down-converting the frequency of the radio frequency signal and the local oscillator signal to an intermediate frequency signal, the input frequency ranges of a radio frequency port and a local oscillator port of the mixer are 75GHz-110GHz, the output frequency range is DC-2.7GHz, and the attenuator is used for adjusting the power of the output signal of the frequency multiplier to a proper range; the low-noise amplifier is used for amplifying a signal emitted by a device to be tested DUT; the filter is used for filtering stray and harmonic waves in the intermediate frequency signal.

As shown in fig. 2, the amplitude-phase detection module is configured to extract amplitude and phase information of a plane wave in a near field of a device to be detected, and includes a 90-degree bridge, a power divider, a CHIP1, and a CHIP 2; the CHIP1 and the CHIP2 are amplitude-phase detection CHIPs AD8302, the input frequency range is DC-2.7GHz, the input amplitude range is-60 dBm-0dBm, the phase discrimination range is 0-180 degrees, in order to expand the phase discrimination range to 0-360 degrees, the structure shown in FIG. 2 is designed, the first intermediate frequency signal IF1 is divided into two paths of signals through 90-degree bridge power, namely a first test signal S1 and a second test signal S2, the second intermediate frequency signal IF2 is used as a reference signal, and the two paths of signals with the same phase, namely a first reference signal L1 and a second reference signal L2, are directly divided into two paths of signals with the same phase; the first test signal S1 and the first reference signal L1 are simultaneously inputted into the CHIP1 for comparison, generating a first amplitude signal P1 and a first phase signal Φ 1; the second test signal S2 is phase-shifted by 90 degrees and then input into the CHIP2 simultaneously with the second reference signal L2 for comparison, generating a second amplitude signal P2 and a second phase signal Φ 2; the first amplitude signal P1 and the second amplitude signal P2 contain amplitude information and the first phase signal phi 1 and the second phase signal phi 2 contain phase information.

As shown in fig. 1, the signal processing module is configured to receive four signals generated by the amplitude and phase detection module: and performing analog-to-digital conversion on the first amplitude signal P1, the first phase signal phi 1, the second amplitude signal P2 and the second phase signal phi 2, and then sending the converted digital signals into a computer to be processed by LEBVIEW software, so as to obtain the amplitude and phase distribution diagram of the near field of the device to be tested.