Amplitude and phase correction device for broadband radio frequency receiving channel

Abstract

The invention discloses a broadband radio frequency receiving channel amplitude-phase correction device, and belongs to the technical field of radio frequency channel correction, and the device comprises a system comprehensive control unit which transmits control parameters to a radio frequency system control unit and a digital acquisition processing unit; the radio frequency system control unit is used for receiving the control parameters and controlling the correction source and the broadband radio frequency receiving channel according to the control parameters; the broadband radio frequency receiving channel is used for synchronously tuning a radio frequency channel; the correction source outputs a correction signal and controls the output mode of the correction signal according to the parameters of the pulse width and the repetition frequency; and the digital acquisition and processing unit is used for receiving the control parameters, acquiring and processing the correction data of the broadband radio frequency receiving channels according to the control parameters, and reporting the difference value of the amplitude and the phase between the channels to the system comprehensive control unit. According to the invention, the rapid amplitude-phase correction function of the broadband radio frequency parallel receiving channel can be realized, and the channel correction efficiency and the working timeliness of a radio frequency system are greatly improved.

Description

Technical Field

[0001] The present application belongs to the technical field of radio frequency channel correction, and in particular, relates to a broadband radio frequency receiving channel amplitude and phase correction device. Background Art

[0002] For complex electronic systems, the frequency bandwidth design of broadband RF receiving channels will span multiple octaves according to the difference in received signals, such as 0.1-18GHz broadband reception. Broadband channel design usually has high requirements for the amplitude and phase consistency of the RF link, especially in the scenario of multi-channel parallel reception, the amplitude and phase consistency between channels will directly affect the performance of the system. The consistency of the full-band indicators of broadband microwave devices is relatively poor, and it will deteriorate with environmental changes. Therefore, the broadband RF receiving channel usually adopts a correction method to correct the channel amplitude and phase differences. The commonly used method adopts the internal correction method, that is, the channel correction is achieved by controlling the broadband correction source in the system to generate an RF excitation signal. The correction method generally adopts the frequency scanning point-by-point correction method. Since the channel operating frequency band is wide, the correction process time will last for a long time, which will affect the normal operation of the system. To address this problem, the traditional method is to complete the correction when the system is powered on and initialized, and no correction is required in the subsequent normal working stage. However, as the working environment changes, the previous correction effect will deteriorate or even no longer apply. In order not to affect the system performance, it needs to be re-calibrated, which will occupy the normal working time of the system, so it is necessary to seek a method for fast amplitude and phase correction.

[0003] The existing rapid amplitude and phase correction methods for RF receiving channels are generally targeted at narrow frequency bands, and rapid correction is achieved by increasing the frequency scanning rate of the correction source. On the one hand, the frequency switching rate of the correction source is required to be fast enough, and on the other hand, the control command transmission delay is required to be small enough. Large-scale RF systems with complex functions have a large number of internal functional nodes, and system control usually adopts a bus form, such as 1553B bus, CAN bus, etc. This type of bus has a low transmission rate and a large delay, and it is also difficult to achieve a broadband, fine-step, and fast-switching correction source. Therefore, the existing rapid amplitude and phase correction technology is difficult to meet the requirements. Summary of the invention

[0004] The purpose of this application is to overcome the defects of the prior art and provide a broadband RF receiving channel amplitude and phase correction device, which uses a correction method based on FPGA control to automatically scan a synchronous pulse broadband phase-locked correction source to achieve a fast amplitude and phase correction function of a broadband RF parallel receiving channel.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] A broadband radio frequency receiving channel amplitude and phase correction device, the device comprising:

[0007] A system integrated control unit, which sends control parameters to the radio frequency system control unit and the digital acquisition processing unit;

[0008] A radio frequency system control unit, the radio frequency system control unit receiving the control parameters and completing control of the correction source and the broadband radio frequency receiving channel according to the control parameters;

[0009] A broadband radio frequency receiving channel, wherein the broadband radio frequency receiving channel is used for synchronous tuning of the radio frequency channel;

[0010] A correction source, which outputs a correction signal and controls an output mode of the correction signal according to parameters of a pulse width and a repetition frequency;

[0011] A digital acquisition processing unit receives the control parameters, completes the acquisition and processing of the broadband RF receiving channel correction data according to the control parameters, and reports the difference values ​​of the amplitude and phase between the channels to the system integrated control unit.

[0012] Furthermore, the control parameters include correction enable, correction start frequency, correction end frequency, frequency step, pulse width, repetition period, dwell time, channel selection, frequency band selection, gain control, delay control and frequency conversion.

[0013] Furthermore, the system integrated control unit sends correction parameters before a first preset time and starts correction at the first preset time.

[0014] Further, the correction source includes a bus interface communication module, a control parameter solution module, a data cache module, a correction source timing control module and a synchronization pulse signal detection module;

[0015] The bus interface communication module is used for receiving control parameters;

[0016] The control parameter solving module is used for correction source control parameter analysis;

[0017] The data cache module is used to correct the cache of control parameters;

[0018] The synchronization pulse signal detection module is used for capturing the falling edge of the synchronization pulse signal;

[0019] The correction source timing control module is used to correct the output frequency timing control.

[0020] Furthermore, the correction source outputs a correction signal corresponding to the starting frequency from a first preset moment, and when the frequency dwell time is reached, outputs the next correction frequency in sequence according to the frequency step, until the end frequency is reached.

[0021] Furthermore, the radio frequency channel synchronous tuning includes frequency band selection, gain control, delay control and frequency conversion.

[0022] Furthermore, the broadband radio frequency receiving channel includes a bus interface communication module, a control parameter solving module, a data buffering module, a frequency band selection module, a gain control module, a delay control module, a frequency conversion control module and a synchronization pulse signal detection module;

[0023] The bus interface communication module is used for receiving control parameters;

[0024] The control parameter solving module is used for correction source control parameter analysis;

[0025] The data cache module is used to correct the cache of control parameters;

[0026] The synchronization pulse signal detection module is used for capturing the falling edge of the synchronization pulse signal;

[0027] The frequency band selection module is used for channel frequency pre-selection filtering;

[0028] The gain control module is used for channel gain tuning control;

[0029] The delay control module is used for channel phase tuning control;

[0030] The frequency conversion control is used for channel frequency converter control.

[0031] Furthermore, the operation timing of the broadband RF receiving channel and the correction source are synchronized.

[0032] Furthermore, the digital acquisition processing unit is triggered to start working by the first preset moment, and completes the acquisition and data processing of the radio frequency signal in synchronization with the working sequence of the correction source.

[0033] Furthermore, the digital acquisition processing unit also completes the correction and compensation of the digital domain signal according to the phase and amplitude differences of each radio frequency channel and feeds back to the system integrated control unit to achieve amplitude and phase consistency among each channel.

[0034] The beneficial effects of this application are:

[0035] The broadband RF receiving channel amplitude and phase correction device provided by the present application realizes the fast amplitude and phase correction function of the broadband RF parallel receiving channel based on the correction method of automatic scanning of the broadband phase-locked correction source of the synchronous pulse. The work flow and logical control relationship are clear and easy to implement; it is triggered based on the falling edge of the synchronous pulse signal to ensure that the control timing is strictly in step; the correction source based on FPGA control automatically scans the output, and the correction method is flexible and configurable, which greatly improves the correction efficiency; it improves the flexibility of system operation and the real-time and accuracy of RF channel correction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural block diagram of a broadband radio frequency receiving channel amplitude and phase correction device according to an embodiment of the present application;

[0037] Figure 2 This is a timing diagram of preset correction control parameters of an embodiment of the present application;

[0038] Figure 3 It is a schematic diagram of the correction source control function composition of an embodiment of the present application;

[0039] Figure 4 is a timing diagram of frequency control of a correction source in an embodiment of the present application;

[0040] Figure 5 is a flow chart of the source correction process control of an embodiment of the present application;

[0041] Figure 6 This is a timing diagram of the correction source modulation control of an embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of the broadband RF channel control function composition of an embodiment of the present application. DETAILED DESCRIPTION

[0043] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0044] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0045] The existing rapid amplitude and phase correction methods for RF receiving channels are generally targeted at narrow frequency bands, and rapid correction is achieved by increasing the frequency scanning rate of the correction source. On the one hand, the frequency switching rate of the correction source is required to be fast enough, and on the other hand, the control command transmission delay is required to be small enough. Large-scale RF systems with complex functions have a large number of internal functional nodes, and system control usually adopts a bus form, such as 1553B bus, CAN bus, etc. This type of bus has a low transmission rate and a large delay, and it is also difficult to achieve a broadband, fine-step, and fast-switching correction source. Therefore, the existing rapid amplitude and phase correction technology is difficult to meet the requirements.

[0046] In order to solve the above technical problems, the following embodiments of a broadband RF receiving channel amplitude and phase correction device are proposed in the present application.

[0047] The embodiment of the present application provides a fast amplitude and phase correction solution for automatic scanning of synchronous pulse internal correction based on FPGA control.

[0048] Reference Figure 1 ,like Figure 1 The figure shows a structural block diagram of a broadband RF receiving channel amplitude and phase correction device according to an embodiment of the present application. The device is composed of a system integrated control unit, a RF system control unit, a broadband RF receiving channel, a correction source and a digital acquisition processing unit.

[0049] The system integrated control unit sends the control parameters to the RF system control unit and the digital acquisition processing unit through the control bus in advance. The RF system control unit needs to parse the control parameters into correction source control parameters and broadband RF receiving channel control parameters, and store them in the parameter buffer. The control parameters sent by the system integrated control unit generally include the following information: correction enable, correction start frequency, correction end frequency, frequency step, pulse width, repetition period, dwell time, channel selection, frequency band selection, gain control, delay control and frequency conversion, etc.

[0050] Reference Figure 2 ,like Figure 2 The figure shows a timing diagram of the preset correction control parameters of an embodiment of the present application. The system integrated control unit first sends the correction parameters at time t1 to the RF system control unit and the digital acquisition processing unit and caches them. The correction is started at time t1, the falling edge of the synchronization pulse signal. The RF system control unit completes the control of the broadband phase-locked correction source within one working cycle according to the preset correction parameters, and realizes the output and switching of the correction frequency. The digital acquisition processing unit completes the collection and processing of the correction data of the broadband RF receiving channel according to the preset correction parameters, and reports the difference values ​​of the amplitude and phase between the channels to the system integrated control unit. The system integrated control unit presets the working parameters at time t1+1 into the broadband RF receiving channel control parameters at time t1+1, and immediately switches to normal operation at time t1+1, the falling edge of the synchronization pulse signal, and realizes the control of the channel attenuation and channel delay of the broadband RF receiving channel.

[0051] The embodiment of the present application uses synchronization pulses for synchronization, and the control parameter preset process does not affect the normal operation of the system. The number of frequency points and the residence time of the correction process can be configured. The correction time can be changed according to the actual use requirements of the system, and the synchronization pulse rhythm can be adjusted to achieve flexible switching between the correction state and the working state.

[0052] The correction source adopts a broadband phase-locked source, which can complete the generation of correction RF signals in the full frequency band and step 10MHz. Its control function is realized in the FPGA in the RF system control unit. Figure 3 ,like Figure 3 The figure shows the composition diagram of the correction source control function of the embodiment of the present application. The correction source control function mainly consists of a bus interface communication module, a control parameter solution module, a data cache module, a correction source timing control module, and a synchronization pulse signal detection module. Among them, the bus interface communication module mainly completes the control parameter reception; the control parameter solution module mainly completes the correction source control parameter analysis; the data cache module mainly completes the correction control parameter cache; the synchronization pulse signal detection module mainly completes the synchronization pulse signal falling edge capture; the correction source timing control module mainly completes the correction output frequency timing control.

[0053] Reference Figure 4 ,like Figure 4 The figure shows a timing diagram of the correction source frequency control in an embodiment of the present application, where f L ——Starting frequency; f H ——stop frequency; Δf——frequency step; Δt——frequency dwell time; N——integer.

[0054] The correction source output frequency control sequence starts from the detection of the falling edge of the synchronization pulse signal. First, the correction signal corresponding to the starting frequency is output, and the correction signal output mode is controlled to be a continuous wave or pulse output according to the parameters of the pulse width and repetition frequency. When the frequency dwell time is reached, the next correction frequency is output in sequence according to the frequency step, realizing the fast frequency sweep output at equal intervals and ending at the end frequency. Figure 5 ,like Figure 5 Shown is a flow chart of the correction source process control according to an embodiment of the present application.

[0055] Reference Figure 6 ,like Figure 6 The figure shows the correction source modulation control timing diagram of the embodiment of the present application. In the correction source control timing, the minimum frequency dwell time can be set to 1us, the minimum pulse width can be set to 1us, and the frequency step is 10MHz. According to the pulse width, repetition frequency, frequency dwell time, correction start frequency, correction end frequency, frequency step and other parameter information sent down, the correction time and correction mode can be adjusted at any time. A correction process can basically be controlled within the order of hundreds of ms, that is, the entire correction process can be controlled within one working beat, which is completely matched with the system working beat, and the correction accuracy and correction real-time performance are high, and the correction method is flexible and changeable.

[0056] The broadband RF channel is the main carrier for receiving RF signals, and generally includes functions such as frequency band selection, gain control, delay control, and frequency conversion. The calibration process also requires the completion of RF channel synchronous tuning, including channel frequency band selection, channel gain control, channel delay control, and frequency converter control. This part of the function is implemented in the FPGA of the RF system control unit, refer to Figure 7 , Figure 7 The figure is a schematic diagram of the broadband RF channel control function composition of an embodiment of the present application.

[0057] The broadband RF channel control functions mainly include bus interface communication module, control parameter solution module, data cache module, frequency band selection module, gain control module, delay control module, frequency conversion control module, and synchronous pulse signal detection module. Among them, the bus interface communication module, control parameter solution module, data cache module, and synchronous pulse signal detection module are the same as the functional modules of the correction source control. The frequency band selection module completes the channel frequency pre-selection filtering function; the gain control module completes the channel gain tuning control; the delay control module completes the channel phase tuning control; and the frequency conversion control completes the channel frequency converter control. The working sequence is synchronized with the correction source working sequence, and both are triggered and started by the falling edge of the synchronous pulse signal. The amplitude and phase balance within each RF channel and between channels can be achieved through broadband RF channel correction control.

[0058] The digital acquisition and processing unit receives the bus control command from the system integrated control unit, starts working by the falling edge of the synchronization pulse signal, and completes the acquisition and data processing of the RF signal in synchronization with the working sequence of the correction source. At the same time, according to the phase and amplitude differences of each RF channel, the correction and compensation of the digital domain signal are completed and fed back to the system integrated control unit to achieve the amplitude and phase consistency between each channel.

[0059] The embodiment of the present application also develops a broadband RF multi-channel frequency conversion receiver according to the above scheme for verification, and realizes fast amplitude and phase correction of hundreds of milliseconds for 17-channel 0.1-18 GHz broadband receiving channels, which greatly improves the system correction efficiency, work flexibility and channel amplitude and phase index consistency, and better meets the needs of engineering applications.

[0060] The broadband RF receiving channel amplitude and phase correction device provided in this embodiment realizes the fast amplitude and phase correction function of the broadband RF parallel receiving channel based on the correction method of automatic scanning of the broadband phase-locked correction source of the synchronous pulse. The working process and the logical control relationship are clear and easy to implement. It is triggered based on the falling edge of the synchronous pulse signal to ensure that the control timing is strictly in step. The correction source based on FPGA control automatically sweeps and outputs, and the correction method is flexible and configurable, which greatly improves the correction efficiency. The flexibility of the system operation and the real-time and accuracy of the RF channel correction are improved.

[0061] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A broadband radio frequency receiving channel amplitude and phase correction device, characterized in that: The device comprises: A system integrated control unit, which sends control parameters to the radio frequency system control unit and the digital acquisition processing unit; A radio frequency system control unit, the radio frequency system control unit receiving the control parameters and completing control of the correction source and the broadband radio frequency receiving channel according to the control parameters; A broadband radio frequency receiving channel, wherein the broadband radio frequency receiving channel is used for synchronous tuning of the radio frequency channel; A correction source, which outputs a correction signal and controls an output mode of the correction signal according to parameters of a pulse width and a repetition frequency; A digital acquisition processing unit receives the control parameters, completes the acquisition and processing of the broadband RF receiving channel correction data according to the control parameters, and reports the difference values ​​of the amplitude and phase between the channels to the system integrated control unit.

2. The broadband RF receiving channel amplitude and phase correction device according to claim 1, characterized in that: The control parameters include correction enable, correction start frequency, correction end frequency, frequency step, pulse width, repetition period, dwell time, channel selection, frequency band selection, gain control, delay control and frequency conversion.

3. The broadband RF receiving channel amplitude and phase correction device according to claim 1, characterized in that: The system integrated control unit sends the correction parameters before the first preset time and starts the correction at the first preset time.

4. The broadband radio frequency receiving channel amplitude and phase correction device according to claim 1, characterized in that: The correction source includes a bus interface communication module, a control parameter solution module, a data cache module, a correction source timing control module and a synchronization pulse signal detection module; The bus interface communication module is used for receiving control parameters; The control parameter solving module is used for correction source control parameter analysis; The data cache module is used to correct the cache of control parameters; The synchronization pulse signal detection module is used for capturing the falling edge of the synchronization pulse signal; The correction source timing control module is used to correct the output frequency timing control.

5. The broadband radio frequency receiving channel amplitude and phase correction device according to claim 3, characterized in that: The correction source starts to output a correction signal corresponding to a starting frequency from a first preset time, and when a frequency dwell time is reached, outputs a next correction frequency in sequence according to frequency step accumulation until the end frequency is reached.

6. The broadband radio frequency receiving channel amplitude and phase correction device according to claim 1, characterized in that: The radio frequency channel synchronous tuning includes frequency band selection, gain control, delay control and frequency conversion.

7. The broadband radio frequency receiving channel amplitude and phase correction device according to claim 1, characterized in that: The broadband radio frequency receiving channel includes a bus interface communication module, a control parameter solving module, a data buffering module, a frequency band selection module, a gain control module, a delay control module, a frequency conversion control module and a synchronization pulse signal detection module; The bus interface communication module is used for receiving control parameters; The control parameter solving module is used for correction source control parameter analysis; The data cache module is used to correct the cache of control parameters; The synchronization pulse signal detection module is used for capturing the falling edge of the synchronization pulse signal; The frequency band selection module is used for channel frequency pre-selection filtering; The gain control module is used for channel gain tuning control; The delay control module is used for channel phase tuning control; The frequency conversion control is used for channel frequency converter control.

8. The broadband radio frequency receiving channel amplitude and phase correction device according to claim 5, characterized in that: The broadband radio frequency receiving channel and the correction source have synchronous working timings.

9. The broadband radio frequency receiving channel amplitude and phase correction device according to claim 8, characterized in that: The digital acquisition processing unit is triggered to start working by the first preset time, and completes the acquisition and data processing of the radio frequency signal in synchronization with the working sequence of the correction source.

10. The wideband radio frequency receiving channel amplitude and phase correction device according to claim 9, characterized in that: The digital acquisition processing unit also completes the correction and compensation of the digital domain signal according to the phase and amplitude differences of each radio frequency channel and feeds back to the system comprehensive control unit to achieve amplitude and phase consistency among each channel.

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