A channelized distributed frequency synthesis system and signal generation method

Abstract

The application provides a channelized distributed frequency synthesis system, comprising: a reference signal generation module, which generates a reference signal and inputs the reference signal into a multi-frequency frequency synthesis signal generation module; the multi-frequency frequency synthesis signal generation module processes the reference signal to generate a reference signal and generates a multi-frequency frequency synthesis signal based on the reference signal; a signal distribution module, which is used for distributing the multi-frequency frequency synthesis signal to N distributed demand nodes; and the N distributed demand nodes extract frequency synthesis signals of required frequencies through filters. The channelized distributed frequency synthesis system provided by the application can obtain frequency synthesis signals of different frequencies at the same time in the distributed system, and the phase correlation of the frequency synthesis signals used by the distributed demand nodes in the channelized microwave system is maintained.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency microwave technology, in particular to a channelized distributed frequency comb system and a signal generation method. BACKGROUND

[0002] In a distributed system, the frequency comb signal as a local oscillator or clock is an indispensable important signal. The phase correlation characteristics between multiple frequency comb signals (manifested as the stability of the phase difference between the same frequency signals and the uniform change of the phase difference between the non-same frequency signals) have an important influence on the performance of the distributed system. In order to maintain the phase correlation between multiple signals, the traditional way is to generate a unified frequency comb signal, which is distributed to each demand node after power distribution. However, this method has limitations: each demand node obtains the same frequency of the frequency comb signal at the same time, and the system application is limited. For example, in "A Large Distributed Array Radar Frequency and Phase Synchronization" (published in Radar Science and Technology, January 2017), the frequency comb signal is distributed to each demand node by optical transmission, which ensures that the frequency comb signal indicators of the demand nodes and the frequency comb signal generation nodes are highly consistent. However, each demand node still uses the same frequency of the frequency comb signal at the same time, which belongs to the traditional distribution scheme. Using a unified reference, a distributed phase-locked loop is used at each demand node to generate the required frequency comb signal, which can meet the requirement of obtaining different frequencies of the frequency comb signal at the same time for each demand node of the frequency comb signal. However, the phase correlation of each frequency comb signal is difficult to guarantee. For example, as described in "Research and Implementation of Digital Phased Array Radar Synchronization Technology" (published in Modern Navigation, May 2021), "secondly, a distributed phase-locked loop is used to provide a working clock inside the digital subarray to ensure the phase consistency of the input reference clock and the working clock. And real-time monitoring of the phase relationship. Since the reference clock is the starting point of the synchronization frequency division, this clock has a great influence, and problems in the monitoring process need to be actively adjusted". First of all, it is difficult to achieve the phase consistency of the input reference clock and the working clock in software and hardware implementation. Secondly, the additional sensing and control resource overhead is limited in effect. It should also be noted that compared with the local oscillator signal, the frequency of the digital clock is relatively low. For local oscillator signals with higher frequencies or even millimeter wave local oscillator signals, this method is difficult to implement or cannot achieve the expected effect.

[0003] On the other hand, with the progress of ultra-wideband sampling technology, channelized microwave systems have developed rapidly and are gradually widely used. By utilizing the frequency comb signal demand characteristics of the channelized system and combining the optimization of the distributed frequency comb architecture, a distributed frequency comb architecture can be realized, which can maintain the phase correlation between multiple frequency comb signals and provide non-same frequency frequency comb signals to each demand node at the same time. SUMMARY

[0004] Aiming at the problems in the prior art, a channelized distributed frequency synthesis system and a signal generation method are provided, which are applied to a channelized microwave system and can maintain the phase correlation between multiple frequency synthesis signals.

[0005] The technical scheme adopted by the present application is as follows: a channelized distributed frequency synthesis system comprises:

[0006] A reference signal generation module generates a reference signal and inputs the reference signal to a multi-frequency frequency synthesis signal generation module;

[0007] The multi-frequency frequency synthesis signal generation module processes the reference signal to generate a reference signal and generates a multi-frequency frequency synthesis signal based on the reference signal;

[0008] A signal distribution module is configured to distribute the multi-frequency frequency synthesis signal to N distributed demand nodes.

[0009] The N distributed demand nodes extract the frequency synthesis signal of a required frequency through a filter.

[0010] Further, the multi-frequency frequency synthesis signal generation module comprises a reference signal processing module and a direct frequency synthesis module, the reference signal processing module is configured to process the reference signal to generate a reference signal, and the direct frequency synthesis module generates a multi-frequency frequency synthesis signal based on the reference signal by using a direct frequency synthesis method.

[0011] Further, the reference signal processing module generates a reference signal of a required frequency by using a frequency division / multiplier circuit or a phase-locked loop.

[0012] Further, the direct frequency synthesis module is implemented by using a comb spectrum generator, the reference signal is input into the comb spectrum generator, and a required multi-frequency frequency synthesis signal is directly generated.

[0013] Further, the direct frequency synthesis module is implemented by using a harmonic generation module, a mixing module and a filtering module, the reference signal processing module generates two reference signals, the two reference signals are input into the harmonic generation module and the mixing module respectively, the signal output by the harmonic generation module is input into the mixing module after being filtered, the mixing module mixes and filters the input reference signals and the signals output by the harmonic generation module multiple times, and a multi-frequency frequency synthesis signal is obtained.

[0014] Further, the signal distribution module is implemented in a one-in-multiple-out power division form or a chain power division form.

[0015] Further, the one-in-multiple-out power division form is implemented by using N power dividers, and the number of output channels is the same as the number of distributed demand nodes.

[0016] Further, the chain type power division form is realized by N-1 two-way power dividers, a multi-frequency frequency synthesis signal is input to the input end of the first two-way power divider, one-way output of each two-way power divider is output to a distributed demand node, and the other way output is output to the input end of the next two-way power divider; the distributed demand node output by each two-way power divider is not repeated.

[0017] The application provides a frequency synthesis signal generation method based on the above channelized distributed frequency synthesis system, which comprises the following steps:

[0018] Step 1, reference signal generation;

[0019] Step 2, processing the reference signal to generate a reference signal required for direct frequency synthesis;

[0020] Step 3, generating a multi-frequency frequency synthesis signal based on the reference signal;

[0021] Step 4, distributing the multi-frequency frequency synthesis signal and transmitting the multi-frequency frequency synthesis signal to a corresponding distributed demand node;

[0022] Step 5, each distributed demand node extracts a frequency synthesis signal of a required frequency for use.

[0023] Compared with the prior art, the beneficial effects of the above technical scheme are as follows:

[0024] 1. At the same time, each demand node in the distributed system can obtain a frequency synthesis signal of a different frequency.

[0025] 2. The phase correlation of the frequency synthesis signals used by each distributed demand node in the channelized microwave system is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The application provides a channelized distributed frequency synthesis system composition schematic diagram.

[0027] Figure 2 The application provides a multi-frequency frequency synthesis signal generation module schematic diagram.

[0028] Figure 3 The application provides an input-multiple-output power division schematic diagram.

[0029] Figure 4 The application provides a chain type power division schematic diagram.

[0030] Figure 5 The application provides a signal generation method based on a channelized distributed frequency synthesis system.

[0031] Figure 6 The application provides a channelized distributed frequency synthesis system schematic diagram in an embodiment.

[0032] Figure 7Fig. 1 is a schematic diagram of a channelized distributed frequency synthesis system according to an embodiment of the present application.

[0033] Figure 8 Fig. 1 is a schematic diagram of a channelized distributed frequency synthesis system according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same or similar designations and functions throughout the various figures and embodiments. The embodiments described below are examples of the present application, and are not intended to limit the present application. Rather, the embodiments of the present application include all modifications, equivalents, and alternatives falling within the spirit and scope of the appended claims.

[0035] As shown in Fig. 1, the present application proposes a channelized distributed frequency synthesis system, which can provide multiple non-same-frequency frequency synthesis signals at the same time and can maintain the phase correlation between the frequency synthesis signals, and the specific scheme is as follows: Figure 1

[0036] A channelized distributed frequency synthesis system comprises: a reference signal generation module, which generates a reference signal and inputs the reference signal to a multi-frequency frequency synthesis signal generation module; the multi-frequency frequency synthesis signal generation module processes the reference signal to generate a reference signal and generates a multi-frequency frequency synthesis signal based on the reference signal; a signal distribution module, which is configured to distribute the multi-frequency frequency synthesis signal to N distributed demand nodes; and the N distributed demand nodes, which extract the frequency synthesis signal of a required frequency through a filter.

[0037] The core of the system is to break the traditional concept of single-frequency frequency synthesis signal generation and distribution. The frequency synthesis signal generated, distributed and transmitted in the link is a composite signal of multiple frequency signals, and the frequency synthesis signal of a required frequency is extracted at the demand node. The multi-frequency frequency synthesis signal generated has phase correlation between the multiple frequency signals. The phase change caused by the distribution, transmission and extraction process is determined and can be removed through calibration, thereby ensuring the phase correlation between the frequency synthesis signals used by each demand node.

[0038] As shown in Fig. 1, the present application proposes a channelized distributed frequency synthesis system, which can provide multiple non-same-frequency frequency synthesis signals at the same time and can maintain the phase correlation between the frequency synthesis signals, and the specific scheme is as follows: Figure 2 As shown in Fig. 2, the multi-frequency frequency synthesis signal generation module first processes the reference signal and then generates a multi-frequency frequency synthesis signal using a direct frequency synthesis circuit. Direct frequency synthesis mainly uses two methods: 1. using a comb line generator to generate a comb line signal as a multi-frequency frequency synthesis signal based on the signal processed by the reference signal; and 2. using a digital-to-analog conversion principle to generate a multi-frequency frequency synthesis signal based on the signal processed by the reference signal. In specific applications, the basic methods can be used flexibly or combined according to the demand for frequency synthesis signals.

[0039] As shown in Fig. 3, the signal distribution module is configured to distribute the multi-frequency frequency synthesis signal to N distributed demand nodes.​Figure 3 、 Figure 4 The signal distribution module is used to distribute the multi-frequency frequency comprehensive signal to each demand node. Two basic topologies, one-in-multiple-out power division and chain power division, are mainly used to realize the distribution.

[0040] As shown in Figure 5 The specific process of the frequency comprehensive signal generation method based on the channelized distributed frequency comprehensive system is as follows:

[0041] Step 1, generating a reference signal;

[0042] Step 2, processing the reference signal to generate a reference signal required for direct frequency synthesis; in actual application, different forms such as frequency division / multiplier, comb line or phase-locked loop can be used to generate the reference signal, and the reference signal is usually a single frequency signal;

[0043] Step 3, generating a multi-frequency frequency comprehensive signal based on the reference signal;

[0044] Step 4, distributing the multi-frequency frequency comprehensive signal and transmitting it to the corresponding distributed demand node;

[0045] Step 5, each distributed demand node extracts the frequency comprehensive signal of the required frequency for use.

[0046] Further, the frequency comprehensive system and the frequency comprehensive signal generation method are further described through the following specific embodiments.

[0047] Embodiment 1

[0048] This embodiment is based on a 100MHz reference signal to generate a 13-20GHz (1GHz interval) local oscillator signal with phase correlation, which meets the demand of the channelized frequency conversion system.

[0049] As shown in Figure 6 In this system, the basic signal processing is realized by a 10 times frequency multiplication circuit, the direct frequency synthesis is realized by a comb line spectrum generator, the signal distribution is realized by an 8-way broadband power divider, and each node uses a corresponding bandpass filter to complete signal extraction.

[0050] The specific working process of the system is as follows:

[0051] 1. Input the 100MHz reference signal to the 10 times frequency multiplication circuit;

[0052] 2. 10 times frequency multiplication is performed on the 100MHz reference signal to generate a 1GHz reference signal;

[0053] 3. The 1GHz reference signal passes through the comb line spectrum generator to generate a multi-frequency frequency comprehensive signal containing 13GHz-20GHz (interval 1GHz);

[0054] 4. The multi-frequency frequency-comb signal is distributed to the distributed channelization demand nodes by using an 8-way broadband power divider;

[0055] 5. The filter is used at each demand node to filter out the useless frequency signals and extract the frequency-comb signal of the required frequency for the channelization channel;

[0056] The embodiment provides the multi-frequency frequency-comb signal for a certain channelization system. Thanks to the transmission and distribution of the multi-frequency frequency-comb signal, the distributed demand nodes can obtain the frequency-comb signals of different frequencies at the same time, so that the channelization channels can work at the same time in the frequency range. Further, because the frequency-comb signals obtained by the distributed demand nodes are homologous power division signals, the frequency-comb signals used by the channelization channels have phase correlation.

[0057] Embodiment 2

[0058] The embodiment is based on a 10MHz reference signal to generate a 1984-2080MHz (interval 32MHz) difference frequency sampling clock.

[0059] As shown in Figure 7 , in the system, the integrated VCO type phase-locked loop with multiple outputs and the 2-frequency division module are used for basic signal processing, the frequency mixing / filtering module and the harmonic generation / filtering module are used for direct frequency synthesis, the 8-way power divider is used for signal distribution, and the corresponding narrowband filter is used for each node to complete signal extraction.

[0060] The specific working process of the system is as follows:

[0061] 1. The 10MHz reference signal is input into the integrated VCO type phase-locked loop;

[0062] 2. The integrated VCO type phase-locked loop with multiple outputs is used to generate a 1920MHz reference signal 1 and a 64MHz signal, and the 64MHz signal is divided by 2 to generate a 32MHz reference signal 2;

[0063] 3. In the multi-frequency frequency-comb signal generation function part, the 2-5th harmonics of the reference signal 1 and the reference signal 2 are mixed and filtered to generate a multi-frequency frequency-comb signal of 1984-2080MHz (interval 32MHz);

[0064] 4. The multi-frequency frequency-comb signal is power divided and distributed to each demand node;

[0065] 5. The narrowband filter is used at each demand node to extract the frequency-comb signal of the required frequency as the difference frequency sampling system clock.

[0066] This embodiment provides a phase-correlated non-co-frequency clock signal for a difference frequency sampling system. By using frequency synthesizer signals of different frequencies as sampling clock channels, it is possible to acquire corresponding sample data within the same sampling gate width.

[0067] Example 3

[0068] This embodiment generates a local oscillator signal with phase correlation in the range of 21.375 to 21.875 GHz (adjustable in intervals of 125 MHz ± 5 MHz) based on a 100 MHz reference signal, thus meeting the requirements of a channelized frequency conversion system.

[0069] like Figure 8 As shown, in this system, basic signal processing is achieved using a power divider and two phase-locked loops (PLL1 and PLL2). Direct frequency synthesis is achieved using a mixer / filter module, a harmonic generator, a low-pass filter, and a DDS circuit. Signal distribution is achieved using a chain-type power divider, and each node uses a corresponding filter to complete signal extraction.

[0070] The specific working process of this system is as follows:

[0071] 1. Input a 100MHz reference signal into the power divider;

[0072] 2. The 100MHz reference signal is power divided, one path generates a 3.2GHz reference signal 1 through phase-locked loop 1, and the other path generates a 21GHz reference signal 2 through phase-locked loop 2;

[0073] 3. In the multi-frequency synthesizer signal generation function section, the 3.2GHz reference signal 1 is used as the reference signal of the DDS circuit to generate a 125MHz±5MHz signal; and through a harmonic generator and a low-pass filter, its 3rd to 7th harmonics are taken to generate a 375MHz~875MHz (125MHz±5MHz interval adjustable) signal; further, this interval adjustable signal is mixed and filtered with 21GHz to obtain a 21.375GHz~21.875GHz (125MHz±5MHz interval adjustable) multi-frequency synthesizer signal;

[0074] 4. A chain-like topology is used to distribute multi-frequency synthesized signals to distributed channelization-required nodes;

[0075] 5. At each required node, filter out useless frequency signals and extract the frequency composite signal of the required frequency.

[0076] This embodiment provides multiple frequency synthesized signals for the X distributed channelization system. In the principle block diagram, the frequency synthesized signals extracted by the two 21.875GHz±25MHz filters have a stable phase difference, and the phase difference between them and the frequency synthesized signals extracted by other filters changes at a constant speed.

[0077] It should be noted that in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present application, and obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A channelized distributed frequency synthesizer system, characterized in that, The application relates to a multi-frequency spectrum signal generation method and device. The application comprises: a reference signal generation module for generating a reference signal input to a multi-frequency spectrum signal generation module; the multi-frequency spectrum signal generation module processes the reference signal to generate a reference signal and generates a multi-frequency spectrum signal based on the reference signal; a signal distribution module for distributing the multi-frequency spectrum signal to N distributed demand nodes; the N distributed demand nodes extract the required frequency spectrum signal through a filter; the signal distribution module adopts a one-in-multiple-out power distribution form or a chain power distribution form; the one-in-multiple-out power distribution form is realized by N power dividers, and the number of output channels is the same as the number of distributed demand nodes; 2. The channelized distributed frequency synthesis system of claim 1, wherein, the chain power distribution form is realized by N-1 one-to-two power dividers, the multi-frequency spectrum signal is input to the input end of the first one-to-two power divider, one output of each one-to-two power divider is output to a distributed demand node, and the other output is output to the input end of the next one-to-two power divider; and the distributed demand nodes output by each one-to-two power divider are not repeated.

3. The channelized distributed frequency synthesis system of claim 2, wherein, The multi-frequency spectrum signal generation module comprises a reference signal processing module and a direct frequency synthesis module, the reference signal processing module is used for processing the reference signal to generate a reference signal, and the direct frequency synthesis module generates the multi-frequency spectrum signal based on the reference signal by using a direct frequency synthesis mode.

4. The channelized distributed frequency synthesis system of claim 2 or 3, wherein, The reference signal processing module adopts a frequency division / multiplier circuit or a phase-locked loop to generate the required frequency reference signal.

5. The channelized distributed frequency synthesis system of claim 2 or 3, wherein, The direct frequency synthesis module adopts a comb spectrum generator to realize direct generation of the required multi-frequency spectrum signal.

6. A method of generating a frequency spectrum signal based on the channelized distributed frequency spectrum system according to any one of claims 1 to 5, characterized in that, The direct frequency synthesis module adopts a harmonic generation module, a mixing module and a filtering module to realize, the reference signal processing module generates two reference signals which are input to the harmonic generation module and the mixing module, the signal output by the harmonic generation module is input to the mixing module after filtering, the mixing module mixes and filters the input reference signal and the signal output multiple times by the harmonic generation module to obtain the multi-frequency spectrum signal. The application relates to a multi-frequency spectrum signal generation method and device. Step 1, reference signal generation; Step 2, processing the reference signal to generate a required reference signal for direct frequency synthesis; Step 3, generating a multi-frequency spectrum signal based on the reference signal; Step 4, distributing the multi-frequency spectrum signal and transmitting the multi-frequency spectrum signal to corresponding distributed demand nodes; Step 5, extracting the required frequency spectrum signal by each distributed demand node for use.

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