Multi-channel phase micro-jump lossless switching device and method
By designing a multi-channel phase micro-hop lossless switching device, using the time difference measurement and lossless switching control module, the problem of signal distortion during the phase micro-hop is solved, and signal quality improvement and system performance optimization are achieved.
Patent Information
- Application Number
- CN202411862344.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-04-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The prior art has signal distortion during phase micro-hopping, affecting the demodulation performance at the receiver, reducing signal quality, increasing design and implementation complexity, and possibly resulting in additional delays.
A multi-channel phase micro-hop lossless switching device is designed, including a time difference measurement module, a lossless switching control module, a phase lock control module, a high-stable crystal oscillator and a distribution amplification module. The phase deviation and frequency deviation are measured through the time difference measurement module, and the lossless switching control module is used for precise quantization and phase lock control to ensure the losslessness of the signal during the switching process.
The common noise is offset through digital measurement to improve transmission reliability; the phase consistency of the signal is maintained and signal quality is improved through the adjustment and control of the phase lock loop; the phase micro-hop resolution and frequency micro-hop resolution are optimized to reduce the phase and frequency deviation changes before and after switching.
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Figure CN119814028A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of time service, positioning and timing, and in particular to a multi-channel phase micro-jump lossless switching device and method. Background Art
[0002] Phase micro-jump is a technology used for high-frequency signal processing, mainly used in wireless communications and radio frequency systems. The signal transmission characteristics are adjusted and optimized by quickly switching the phase of the signal. Lossless switching technology is a technology used to achieve switching between devices and signal sources, and its purpose is to avoid data loss or signal interruption during the switching process. Although phase micro-jump and lossless switching play an important role in the field of signal processing, there is signal distortion, which affects the demodulation performance of the receiving end, affects real-time applications, and reduces the efficiency of the system.
[0003] Traditional phase micro-jump technology uses a carrier signal as the basic signal, and dynamically adjusts the phase of the signal through DSP. The modulated signal is sent to a transmission medium such as radio and optical fiber. After receiving the modulated signal, the phase information is restored to the original data through a phase modulator. In an environment with multiple signal sources, phase synchronization is essential. Phase-locked loop (PLL) technology is generally used to maintain the phase consistency of the signal. The basic working principle of the phase-locked loop is to automatically adjust the phase through a feedback mechanism to ensure that the received signal matches the reference signal. However, in high-speed transmission, phase micro-jumps may cause signal distortion, affect the demodulation performance of the receiving end, and reduce the quality of the signal. In order to reduce the impact of phase micro-jumps, the system may require more complex compensation algorithms, which increases the complexity of design and implementation and may cause additional delays. Summary of the invention
[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a multi-channel phase micro-jump lossless switching device and method to reduce the impact of phase micro-jumps on signal quality and reliability, ensure losslessness during signal switching, and thus improve overall system performance.
[0005] The objective of the present invention is achieved through the following technical solutions: In a first aspect, a multi-channel phase micro-jump lossless switching device includes: a time difference measurement module, a lossless switching control module, a phase-locked control module, a high-stability crystal oscillator and a distribution amplifier module; The output end of the time difference measurement module is connected to the input end of the lossless switching control module, the output end of the lossless switching control module is connected to the input end of the phase-locked control module, the output end of the phase-locked control module is connected to the input end of the high-stability crystal oscillator, and the output end of the high-stability crystal oscillator is connected to the input end of the distribution amplification module; The time difference measurement module includes multiple time signal input terminals, a local reference signal input terminal and multiple time difference information output terminals, and the time signal input terminal is used to receive multi-channel frequency standard signals; the distribution and amplification module includes multiple local signal output terminals, and the local signal output terminals are used to output local time signals, and one of the local signal output terminals of the distribution and amplification module is connected to the local reference signal input terminal of the time difference measurement module; The time difference measurement module includes a plurality of time difference measurement units, each of which is used to measure a phase deviation and a frequency deviation between a local reference signal and an input measured signal.
[0006] Further, the time difference measurement unit includes: a reference source, a measured source, an intermediate source, a first analog-to-digital converter, a second analog-to-digital converter, a shaping unit, an I / Q direct digital frequency synthesizer, a first sine mixer, a second sine mixer, a first cosine mixer, a second cosine mixer, a first low-pass filter, a second low-pass filter, a third low-pass filter, and a fourth low-pass filter; The reference source outputs a reference signal to the first analog-to-digital converter, the measured source outputs a measured signal to the second analog-to-digital converter, the intermediate source outputs an intermediate signal to the shaping unit, the shaping unit outputs a shaped intermediate signal to the first analog-to-digital converter, the second analog-to-digital converter and the I / Q direct digital frequency synthesizer, the first analog-to-digital converter outputs a quantized reference signal to the first sine mixer and the first cosine mixer, the second analog-to-digital converter outputs a quantized measured signal to the second sine mixer and the second cosine mixer, the I / Q direct digital frequency synthesizer generates a quantized reference signal according to the shaped intermediate signal. The signal generates an in-phase component and an orthogonal component of a shaped intermediate signal, outputs a first in-phase component to a first sine mixer, a first orthogonal component to a first cosine mixer, a second in-phase component to a second sine mixer, and a second orthogonal component to a second cosine mixer, and the first sine mixer, the second sine mixer, the first cosine mixer and the second cosine mixer output mixing signals to a first low-pass filter, a second low-pass filter, a third low-pass filter and a fourth low-pass filter respectively, to obtain a phase deviation and a frequency deviation between a measured signal and a reference signal.
[0007] Furthermore, it also includes a plurality of front-end conditioning circuits connected to the input end of the time difference measurement module, and the front-end conditioning circuit is used to amplify the weak time input signal and provide isolation function.
[0008] Further, the lossless switching control module comprises an analog signal input terminal, a data processing unit, a digital-to-analog conversion unit, an oven-controlled crystal oscillator (OCXO) and an analog signal output terminal which are connected in sequence; The data preprocessing unit is used to select the input signal channel with the smallest phase deviation and frequency deviation according to the real-time comparison result of the multi-channel input signal; The digital-to-analog conversion unit is used to convert the digital signal into an analog control signal; The oven controlled crystal oscillator (OCXO) is used to output a phase-continuous local time signal according to an analog control signal.
[0009] In a second aspect, a multi-channel phase micro-jump lossless switching method includes: Step 1: Measure and output the phase deviation and frequency deviation information between the multi-channel input frequency standard signal and the local reference signal to the lossless switching control module through the time difference measurement module; Step 2: Accurately quantify the phase deviation and frequency deviation information through a lossless switching control module to provide an accurate correction amount for the phase-locked control module; Step 3: The phase-locked control module switches channels according to the correction information provided by the lossless switching control module, and outputs a control signal with continuous phases before and after switching to a high-stability crystal oscillator; Step 4: The high-stability crystal oscillator outputs a stable frequency reference signal to the distribution amplifier module according to the control signal; Step 5: The stable frequency reference signal is split and amplified by the distribution amplifier module to output multiple local time signals.
[0010] The beneficial effects of the present invention are: 1) Digital measurement cancels out the common noise of the measurement system and improves transmission reliability.
[0011] 2) By adjusting and controlling the phase-locked loop, the continuity of phase and frequency is ensured, the phase consistency of the signal is maintained, and the signal quality is improved.
[0012] 3) The data processing module reduces the phase and frequency deviation changes before and after switching, and optimizes the phase micro-step resolution and frequency micro-step resolution. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural block diagram of a multi-channel phase micro-step lossless switching device according to an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a time difference measurement unit according to an embodiment of the present invention; Figure 3 is an implementation block diagram of a lossless switching control module according to an embodiment of the present invention; Figure 4 A frequency micro-step resolution test connection diagram according to an embodiment of the present invention; Figure 5 A phase micro-step resolution test connection diagram according to an embodiment of the present invention; Figure 6 This is a graph showing the phase micro-jump resolution test results of an embodiment of the present invention. DETAILED DESCRIPTION
[0014] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.
[0015] See also Figure 1-Figure 6 , the present invention provides a technical solution: Embodiment 1: A multi-channel phase micro-step lossless switching device, such as Figure 1 , including: time difference measurement module, lossless switching control module, phase-locked control module, high-stability crystal oscillator and distribution amplifier module; The output end of the time difference measurement module is connected to the input end of the lossless switching control module, the output end of the lossless switching control module is connected to the input end of the phase-locked control module, the output end of the phase-locked control module is connected to the input end of the high-stability crystal oscillator, and the output end of the high-stability crystal oscillator is connected to the input end of the distribution amplification module; The time difference measurement module includes multiple time signal input terminals, a local reference signal input terminal and multiple time difference information output terminals, and the time signal input terminal is used to receive multi-channel frequency standard signals; the distribution and amplification module includes multiple local signal output terminals, and the local signal output terminals are used to output local time signals, and one of the local signal output terminals of the distribution and amplification module is connected to the local reference signal input terminal of the time difference measurement module; The time difference measurement module includes a plurality of time difference measurement units, each of which is used to measure a phase deviation and a frequency deviation between a local reference signal and an input measured signal.
[0016] In a preferred embodiment, the time difference measurement unit includes: a reference source, a measured source, an intermediate source, a first analog-to-digital converter, a second analog-to-digital converter, a shaping unit, an I / Q direct digital frequency synthesizer, a first sine mixer, a second sine mixer, a first cosine mixer, a second cosine mixer, a first low-pass filter, a second low-pass filter, a third low-pass filter, and a fourth low-pass filter; The structure and principle of the time difference measurement unit are as follows Figure 2As shown, the reference source outputs a reference signal to the first analog-to-digital converter, the measured source outputs a measured signal to the second analog-to-digital converter, the intermediate source outputs an intermediate signal to the shaping unit, the shaping unit outputs a shaped intermediate signal to the first analog-to-digital converter, the second analog-to-digital converter and the I / Q direct digital frequency synthesizer, the first analog-to-digital converter outputs a quantized reference signal to the first sine mixer and the first cosine mixer, the second analog-to-digital converter outputs a quantized measured signal to the second sine mixer and the second cosine mixer, the I / Q direct digital frequency synthesizer generates a quantized reference signal according to the shaping intermediate signal. The signal generates an in-phase component and an orthogonal component of a shaping intermediate signal, outputs a first in-phase component to a first sine mixer, a first orthogonal component to a first cosine mixer, a second in-phase component to a second sine mixer, and a second orthogonal component to a second cosine mixer, and the first sine mixer, the second sine mixer, the first cosine mixer and the second cosine mixer output mixing signals to a first low-pass filter, a second low-pass filter, a third low-pass filter and a fourth low-pass filter respectively, to obtain a phase deviation and a frequency deviation between a measured signal and a reference signal.
[0017] The reference signal and the local measured signal are collected and quantized by high-speed AD, and then digitally mixed and filtered to obtain the phase deviation and frequency deviation between the measured signal and the reference signal. On the one hand, the digital time difference measurement offsets the common noise of the measurement system through two completely symmetrical forms. On the other hand, it minimizes the temperature characteristics of the devices in the loop through digitization and improves the long-term stability index.
[0018] In some specific embodiments, a plurality of front-end conditioning circuits connected to the input end of the time difference measurement module are also included, and the front-end conditioning circuit is used to amplify the weak time input signal and provide isolation function. The main function of the front-end conditioning circuit is to condition the input signal to make it suitable for subsequent processing. Amplify the weak input signal, especially when the voltage or current of the signal source is low, the gain circuit (such as an amplifier) can amplify the signal to a suitable range so that the back-end system can process it. Provide isolation function, reduce electrical interference or ground loop effect between systems, and ensure the purity of the signal.
[0019] In some specific embodiments, the lossless switching control module includes an analog signal input terminal, a data processing unit, a digital-to-analog conversion unit, an oven-controlled crystal oscillator (OCXO), and an analog signal output terminal connected in sequence. The implementation block diagram of the lossless switching control module is shown in FIG. Figure 3 As shown; among which: The data preprocessing unit is used to select the input signal channel with the smallest phase deviation and frequency deviation according to the real-time comparison result of the multi-channel input signal; The digital-to-analog conversion unit is used to convert the digital signal into an analog control signal; The oven controlled crystal oscillator (OCXO) is used to output a phase-continuous local time signal according to an analog control signal.
[0020] The channel phase micro-jump lossless switching device of the present invention realizes real-time comparison of multi-channel input signals through high-precision time difference measurement and comparison technology, and applies the comparison results to the low-noise phase-locked control module to achieve phase continuity of the output frequency signal before and after switching. A high-stability crystal oscillator is used as the output internally, and its voltage-controlled end is controlled through low-noise phase-locked technology to achieve micro-jumps of phase and frequency.
[0021] Embodiment 2: A multi-channel phase micro-step lossless switching method, comprising: Step 1: Measure and output the phase deviation and frequency deviation information between the multi-channel input frequency standard signal and the local reference signal to the lossless switching control module through the time difference measurement module; Step 2: Accurately quantify the phase deviation and frequency deviation information through a lossless switching control module to provide an accurate correction amount for the phase-locked control module; Step 3: The phase-locked control module switches channels according to the correction information provided by the lossless switching control module, and outputs a control signal with continuous phases before and after switching to a high-stability crystal oscillator; Step 4: The high-stability crystal oscillator outputs a stable frequency reference signal to the distribution amplifier module according to the control signal; Step 5: The stable frequency reference signal is split and amplified by the distribution amplifier module to output multiple local time signals.
[0022] By adopting a fully digital solution, the frequency difference and phase difference data of the input signal of each channel can be accurately quantified, providing accurate correction value for the digital phase-locked loop when switching channels, and ultimately achieving smooth switching of signals.
[0023] Assume that the input signal of channel 1 is: Assume that the input signal of channel 2 is: Unit time The phase difference between channel 1 and channel 2 is for: When the channel is switched, the data processing module adjusts and controls the phase-locked loop according to the frequency difference and phase difference data reported by the high-precision time difference comparison module to ensure the continuity of phase and frequency.
[0024] In order to calculate the frequency and phase micro-step resolution of the multi-channel phase micro-step lossless switching device, respectively, Figure 4 and Figure 5Test the connection method shown.
[0025] like Figure 4 , the cesium atomic clock is output to the frequency standard distribution amplifier, and one channel is used as the reference of the phase comparator after amplification, and the other 6 channels are used as the input of the device under test; the device under test is controlled by computer software: the minimum frequency step (1E-19) is continuously adjusted at equal time intervals of 0.01s, and the adjustment is continuous for 150,000,000 times; the computer simultaneously collects the test data of the phase comparator (the sampling time is set to 10s), and the test data is linearly fitted by the Stable32 analysis software to calculate the frequency micro-jump resolution, and the frequency micro-jump resolution is obtained as: The measured value is consistent with the set value, so the frequency micro-step resolution is better than 1E-19.
[0026] like Figure 5 , the cesium atomic clock is output to the frequency distribution amplifier, and one channel is used as the reference of the phase comparator after amplification, and the other 6 channels are used as the input of the device under test after passing through delay lines of different lengths; through computer software, the device under test is controlled by the host computer software, and the locked channels are switched to 1, 2, 3, 4, 5, and 6 respectively. Each channel is tested for 100 seconds. The computer simultaneously collects the test data of the phase comparator (the sampling time is set to 1s), and the test data is linearly fitted through the Stable32 analysis software to calculate the phase micro-jump resolution. The test results ( Figure 6 ) shows that the phase jump during channel switching is less than 5ps.
[0027] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.
Claims
1. A multi-channel phase micro-step lossless switching device, characterized in that: include: Time difference measurement module, lossless switching control module, phase-locked control module, high-stability crystal oscillator and distribution amplifier module; The output end of the time difference measurement module is connected to the input end of the lossless switching control module, the output end of the lossless switching control module is connected to the input end of the phase-locked control module, the output end of the phase-locked control module is connected to the input end of the high-stability crystal oscillator, and the output end of the high-stability crystal oscillator is connected to the input end of the distribution amplification module; The time difference measurement module includes multiple time signal input terminals, a local reference signal input terminal and multiple time difference information output terminals, and the time signal input terminal is used to receive multi-channel frequency standard signals; the distribution and amplification module includes multiple local signal output terminals, and the local signal output terminals are used to output local time signals, and one of the local signal output terminals of the distribution and amplification module is connected to the local reference signal input terminal of the time difference measurement module; The time difference measurement module includes a plurality of time difference measurement units, each of which is used to measure a phase deviation and a frequency deviation between a local reference signal and an input measured signal.
2. A multi-channel phase micro-jump lossless switching device according to claim 1, characterized in that: The time difference measurement unit comprises: a reference source, a measured source, an intermediate source, a first analog-to-digital converter, a second analog-to-digital converter, a shaping unit, an I / Q direct digital frequency synthesizer, a first sine mixer, a second sine mixer, a first cosine mixer, a second cosine mixer, a first low-pass filter, a second low-pass filter, a third low-pass filter, and a fourth low-pass filter; The reference source outputs a reference signal to the first analog-to-digital converter, the measured source outputs a measured signal to the second analog-to-digital converter, the intermediate source outputs an intermediate signal to the shaping unit, the shaping unit outputs a shaped intermediate signal to the first analog-to-digital converter, the second analog-to-digital converter and the I / Q direct digital frequency synthesizer, the first analog-to-digital converter outputs a quantized reference signal to the first sine mixer and the first cosine mixer, the second analog-to-digital converter outputs a quantized measured signal to the second sine mixer and the second cosine mixer, the I / Q direct digital frequency synthesizer generates a quantized reference signal according to the shaped intermediate signal. The signal generates an in-phase component and an orthogonal component of a shaped intermediate signal, outputs a first in-phase component to a first sine mixer, a first orthogonal component to a first cosine mixer, a second in-phase component to a second sine mixer, and a second orthogonal component to a second cosine mixer, and the first sine mixer, the second sine mixer, the first cosine mixer and the second cosine mixer output mixing signals to a first low-pass filter, a second low-pass filter, a third low-pass filter and a fourth low-pass filter respectively, to obtain a phase deviation and a frequency deviation between a measured signal and a reference signal.
3. The multi-channel phase micro-jump lossless switching device according to claim 1, characterized in that: It also includes a plurality of front-end conditioning circuits connected to the input end of the time difference measurement module, and the front-end conditioning circuit is used to amplify the weak time input signal and provide isolation function.
4. The multi-channel phase micro-jump lossless switching device according to claim 1, characterized in that: The lossless switching control module comprises an analog signal input terminal, a data processing unit, a digital-to-analog conversion unit, an oven-controlled crystal oscillator (OCXO), and an analog signal output terminal connected in sequence; The data preprocessing unit is used to select the input signal channel with the smallest phase deviation and frequency deviation according to the real-time comparison result of the multi-channel input signal; The digital-to-analog conversion unit is used to convert the digital signal into an analog control signal; The oven controlled crystal oscillator (OCXO) is used to output a phase-continuous local time signal according to an analog control signal.
5. A multi-channel phase micro-step lossless switching method, characterized in that: include: Step 1: Measure and output the phase deviation and frequency deviation information between the multi-channel input frequency standard signal and the local reference signal to the lossless switching control module through the time difference measurement module; Step 2: Accurately quantify the phase deviation and frequency deviation information through a lossless switching control module to provide an accurate correction amount for the phase-locked control module; Step 3: The phase-locked control module switches channels according to the correction information provided by the lossless switching control module, and outputs a control signal with continuous phases before and after switching to a high-stability crystal oscillator; Step 4: The high-stability crystal oscillator outputs a stable frequency reference signal to the distribution amplifier module according to the control signal; Step 5: The stable frequency reference signal is split and amplified by the distribution amplifier module to output multiple local time signals.