CN219268863U

CN219268863U - Equipment for monitoring multipath signals in real time

Info

Publication number: CN219268863U
Application number: CN202223234630.4U
Authority: CN
Inventors: 侯飞; 卢晨; 钱张宏; 张明珠
Original assignee: Nanjing Glarun Atten Technoogy Co ltd
Current assignee: Nanjing Glarun Atten Technoogy Co ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-06-27
Anticipated expiration: 2032-12-05

Abstract

The utility model provides a real-time supervision multichannel signal's equipment, including multichannel radio frequency signal receiving channel unit, multichannel power supply voltage test unit, digital signal processing unit, frequency synthesis unit, multichannel radio frequency signal receiving channel unit is with the radio frequency signal of receiving, through the preliminary treatment, send digital signal processing unit, multichannel power supply voltage test unit is with the power supply voltage of receiving, through AD digital acquisition processing, send digital signal processing unit, digital signal processing unit processes all kinds of signals of receiving, frequency synthesis unit provides the required local oscillator signal of frequency conversion to multichannel radio frequency signal receiving channel unit.

Description

Equipment for monitoring multipath signals in real time

Technical Field

The utility model belongs to the technical field of signal processing, and particularly relates to a monitoring technology.

Background

The development of communication technology, instruments and meters, testing technology and other related technologies has put forward higher and more complete demands on monitoring equipment, and the special equipment for real-time monitoring, which needs to have higher measurement precision, more accurate frequency resolution, wider testing range, more complete functions, good real-time performance, low power consumption, miniaturization, unitization and functionalization, and multiple testing types, has not been released temporarily.

Disclosure of Invention

The utility model provides equipment for monitoring multiple paths of signals in real time in order to solve the problems in the prior art, and adopts the following technical scheme in order to achieve the purposes.

The device comprises a multipath radio frequency signal receiving channel unit, a multipath power supply voltage testing unit, a digital signal processing unit and a frequency synthesizing unit, wherein the multipath radio frequency signal receiving channel unit is used for preprocessing received radio frequency signals and transmitting the preprocessed radio frequency signals to the digital signal processing unit, the multipath power supply voltage testing unit is used for acquiring and processing the received power supply voltages through AD (analog-to-digital) digital acquisition and transmitting the processed power supply voltages to the digital signal processing unit, the digital signal processing unit is used for processing various received signals, and the frequency synthesizing unit is used for providing local oscillation signals required by frequency conversion for the multipath radio frequency signal receiving channel unit.

The multi-channel radio frequency signal receiving channel unit comprises a switch filtering channel circuit, a self-checking signal generating circuit and a clock signal generating circuit, wherein the switch filtering channel circuit comprises a high-speed switch, filters with different wave bands, a mixer, a band-pass filter and an amplifier, the received multi-channel radio frequency signals are sorted into different channels through switch switching selection, the super heterodyne principle is adopted, intermediate frequency signals are generated through down-conversion, filtering and amplification treatment, the self-checking signal generating circuit comprises a filter, a power divider, an amplifier, a frequency multiplier, a filter, an amplifier and a switch, multi-channel self-checking signals are generated, self faults are detected, the clock signal generating circuit comprises an amplifier, a frequency multiplier and a filter, multi-channel clock signals are generated through frequency multiplication, filtering and amplification treatment, and the multi-channel clock signals are sent to the digital signal processing unit.

The multi-path power supply voltage testing unit comprises a switch, a resistor network and an AD unit, and is used for collecting and testing the received multi-path power supply voltage.

The digital signal processing unit receives radio frequency signals sent by the multipath radio frequency signal receiving channel unit, and the frequency, phase noise, power and spurious indexes of the signals are analyzed in real time through AD sampling and digital sampling processing, so that data sent by the multipath power supply voltage testing unit are integrated.

Further, the digital signal processing unit performs down-conversion, extraction and FFT processing on the sampled digital signals through the FPGA, performs amplitude calibration compensation on signals in different frequency bands, and performs temperature calibration compensation on test values in different temperature environments.

The utility model has the beneficial effects that: the unit modularization design has high reliability, can monitor a plurality of signals, has a plurality of indexes, realizes real-time measurement of phase noise, power, frequency and stray indexes, and has good precision, high accuracy and wide temperature range.

Drawings

Fig. 1 is a schematic block diagram of a 20-way real-time signal monitoring device, fig. 2 is a schematic block diagram of a 20-way real-time signal monitoring device switch filtering channel, fig. 3 is a schematic block diagram of a 20-way real-time signal monitoring device self-checking signal generating circuit, fig. 4 is a schematic block diagram of a 20-way real-time signal monitoring device clock signal generating circuit, fig. 5 is a schematic block diagram of a 20-way real-time signal monitoring device power supply voltage testing unit, fig. 6 is a schematic block diagram of a 20-way real-time signal monitoring device digital signal processing unit, and fig. 7 is a schematic block diagram of a 20-way real-time signal monitoring device frequency synthesizing unit.

Detailed Description

The technical scheme of the utility model is specifically described below by taking 20 paths as examples with reference to the accompanying drawings.

The overall working principle of the 20-channel real-time signal monitoring equipment is shown in fig. 1, and the 20-channel real-time signal monitoring equipment consists of a 20-channel radio frequency signal receiving channel unit, a 20-channel power supply voltage testing unit, a frequency synthesizing unit and a digital signal processing unit.

The receiving process is divided into two parts: the 20 paths of radio frequency signal receiving channel units receive radio frequency signals, the 20 paths of power supply voltage testing units receive power supply voltages, control commands and synchronous signals are sent to the digital signal processing unit, and the 20 paths of radio frequency signal receiving channel units and the 20 paths of power supply voltage testing units are controlled after the commands are converted.

The 20 paths of radio frequency signals are subjected to frequency preselection through a switch filter circuit, the preselected signals enter different channels and are mixed with different local oscillation signals generated by a frequency synthesis unit, and after mixing, the signals are input into a digital signal processing unit through signal processing such as filtering and amplifying.

The digital signal processing unit carries out digital down-conversion on the sampled data to a baseband signal through high-speed AD sampling data, and carries out signal analysis through extraction, FFT and the like, thereby realizing real-time testing on indexes such as frequency, phase noise, power, straying and the like of 20 paths of signals.

The 20 paths of power supply voltage testing units switch 20 paths of different numerical voltages to different channels of AD input through a switch, the AD acquires the input voltage values, after digital comparison processing, initial values of the 20 paths of power supply voltages are obtained, the initial values are compared with a calibration table and adjusted, accurate measured values are obtained, the accurate measured values are output to a digital signal processing unit through an SPI interface, and all the tested numerical values are integrated and output together.

The switch filtering channel circuit is shown in fig. 2, sorts the input radio frequency signals into different channels, and selects mixing or direct connection according to different frequency bands of the input radio frequency signals.

The high-frequency band signals and different local oscillation signals output by the frequency synthesis unit are mixed to become low-frequency band signals, the low-frequency band signals after being filtered and the direct connection are switched through a switch and enter a main channel of a receiving channel unit together, spurious signals are filtered through a filter, a program-controlled attenuator and dynamic ranges of channels are adjusted through a variable gain amplifier, the spurious signals are sent to a digital signal processing unit through one channel of a coupler, and the coupling end outputs and detects and compares the signals to be used as BIT of a channel circuit of the receiving channel unit.

The self-checking signal generating circuit of the 20 paths of radio frequency signal receiving channel units is shown in fig. 3, and is used for generating a self-checking signal BIT, and when the equipment is started for self-checking, the self-checking signal BIT is sent into the 20 paths of radio frequency signal receiving channel units, and whether the channel works normally is detected.

The method comprises the steps of inputting 100MHz signals to a self-checking signal generating circuit, outputting self-checking signals 1 through a power divider, outputting frequency multiplication through one path, dividing the frequency multiplication signal into two paths, selecting different frequency multiplication signals through different filters, and amplifying and outputting self-checking signals 2 and 3.

When the self-checking signal generating circuit is in a non-self-checking state, the power supply of the self-checking signal generating circuit is cut off, the self-checking signal is not generated, and the normal receiving function of the 20 paths of radio frequency signal receiving channel units is not influenced.

The clock signal generating circuit of the 20-path radio frequency signal receiving channel unit is shown in fig. 4, and switches the internal and external 100MHz reference inputs through a switch, and the clock signal generating circuit is used for switching the internal and external 100MHz reference inputs, and is used for sending the clock signal into the self-checking circuit through power division, sending the clock signal into the frequency synthesizing unit, obtaining stable and low-spurious clock signals through frequency multiplication, filtering and amplification, and sending the clock signals into the digital signal processing unit to be used as a global clock required by the digital signal processing unit.

As shown in FIG. 5, the 20 paths of input 20 paths of voltages enter different resistor networks through switches, the partial voltage reaches the range that AD can be sampled, and after AD sampling, the input 20 paths of voltages are digitally processed by the FPGA.

The power supply monitoring unit is interacted with the FPGA of the digital processing unit through the SPI control bus, the voltage test value is uploaded to the FPGA of the digital processing unit, and the power supply monitoring unit outputs the value through other modes such as an optical port, a network port and the like to serve as independent power supply voltage test equipment.

The circuit of the digital signal processing unit is shown in fig. 6, after the radio frequency signal is processed by the 20 paths of radio frequency signal receiving channel units, the radio frequency signal is input into the ADC of the digital signal processing unit, and the clock generated by the clock signal generating circuit generates various clocks required by ADC, FPGA, DSP through the clock distribution chip inside the digital signal processing unit.

After ADC sampling, the sampled data is provided to FPGA for realizing digital down conversion DDC, FFT, control logic and interface protocol, and DSP is used for assisting FPGA to complete relevant processing and control.

The frequency synthesis unit is shown in fig. 7, amplifies and divides the low-noise high-stability 100MHz signal generated by the clock signal, outputs two paths of 100MHz signals, outputs local oscillation signal 1 after one path of the 100MHz signal is subjected to frequency multiplication, filtering, amplification and low-pass filtering, amplifies the signal amplitude to the power required by the comb spectrum generator, generates the comb spectrum signal by the comb spectrum generator, filters out high-end spurious signals by the filter, divides the high-end spurious signals into two paths by the power divider, respectively passes through different switch filter banks, obtains local oscillation signals with different frequencies, and outputs local oscillation signal 2 and local oscillation signal 3 after attenuating and amplifying the output amplitude of the adjusting signal.

The 20-channel real-time signal monitoring equipment is used for real-time monitoring of various radio frequency signal spectrums and real-time detection of various power supply voltages, realizes real-time multi-channel data collection and analysis, has a self fault diagnosis function, and provides an important means for monitoring, detecting and maintaining equipment such as communication equipment.

The foregoing is illustrative of the present utility model and is not to be construed as limiting thereof, but rather as being included within the spirit and scope of the present utility model.

Claims

1. An apparatus for monitoring multiple signals in real time, comprising: the multi-channel radio frequency signal receiving channel unit is used for preprocessing received radio frequency signals and sending the preprocessed radio frequency signals to the digital signal processing unit, the multi-channel radio frequency signal receiving channel unit is used for sending the received power supply voltages to the digital signal processing unit after AD digital acquisition and processing, the digital signal processing unit is used for processing various received signals, and the frequency synthesizing unit is used for providing local oscillation signals required by frequency conversion for the multi-channel radio frequency signal receiving channel unit.

2. The apparatus for real-time monitoring of multiple signals according to claim 1, wherein said multiple radio frequency signal receiving channel unit comprises: the self-checking signal generating circuit comprises a filter, a power divider, an amplifier, a frequency multiplier, a filter, an amplifier, a self-checking signal, a clock signal generating circuit and a digital signal processing unit, wherein the filter comprises a high-speed switch, filters with different wave bands, a mixer, a band-pass filter and an amplifier, the received multi-channel radio frequency signals are selected into different channels through switching selection of the switch, the super heterodyne principle is adopted, intermediate frequency signals are generated through down conversion, filtering and amplification, the self-checking signal generating circuit comprises the filter, the power divider, the amplifier, the frequency multiplier, the filter, the amplifier and the switch, multi-channel self-checking signals are generated, the self-checking faults are detected, the clock signal generating circuit comprises the amplifier, the frequency multiplier and the filter, the multi-channel clock signals are generated through frequency multiplication, filtering and amplification, and the multi-channel clock signals are sent to the digital signal processing unit.

3. The apparatus for real-time monitoring of multiple signals according to claim 1, wherein said multiple supply voltage test unit comprises: the device comprises a switch, a resistor network and an AD unit, wherein the switch, the resistor network and the AD unit are used for collecting and testing received multipath power supply voltages.

4. The apparatus for real-time monitoring of multiple signals according to claim 1, wherein the digital signal processing unit is configured to receive the radio frequency signals sent by the multiple radio frequency signal receiving channel unit, and perform AD sampling and digital sampling processing to analyze the frequency, phase noise, power, and spurious indexes of the signals in real time, and integrate the data sent by the multiple power supply voltage testing unit.

5. The apparatus for real-time monitoring of multiple signals according to claim 4, wherein said digital signal processing unit comprises: the FPGA is used for carrying out down-conversion, extraction and FFT processing on the sampled digital signals, carrying out amplitude calibration compensation on signals in different frequency bands, and carrying out temperature calibration compensation on test values in different temperature environments.