Miniaturized TR assembly based on FPGA radio frequency direct output

Abstract

The invention discloses a miniaturized TR assembly based on FPGA radio frequency direct output, which comprises an optical module, an FPGA module and a plurality of transceiver modules, one end of the optical module is connected with a master control module, the other end of the optical module is connected with the FPGA module, the FPGA module is respectively connected with the plurality of transceiver modules, each transceiver module comprises a transmitting link and a receiving link, the transmitting link is connected with the receiving link, and the receiving link is connected with the transmitting link. Through the transmitting link and the receiving link, direct output and direct acquisition of an L-band radio frequency signal are respectively realized. According to the invention, internal resources of the chip are fully utilized, the eight-channel radio frequency direct output and direct acquisition technology is realized, hardware link devices are reduced, the size, weight and cost of the whole machine are greatly reduced, and the miniaturized design has a wide application prospect in the field of large phased arrays.

Description

Technical Field

[0001] The present invention relates to the technical field of digital signal processing, and in particular to a miniaturized TR component based on FPGA radio frequency direct output. Background Art

[0002] Traditional multi-channel T / R component architecture such as Figure 1 As shown, it mainly adopts FPGA+DAC+frequency conversion architecture, and its working principle is: Transmitting link: FPGA receives I / Q weighted signals and AM, ATT, T / R and other transmitting framework signals sent by the main control module through optical fiber. The I / Q weighted signals are processed by FPGA and sent to the DAC digital-to-analog conversion chip, which converts the I / Q baseband signals into 175MHz intermediate frequency signals. After filtering by the intermediate frequency filter, the L-band RF signals are output through the mixer. After filtering, the RF signals are amplified in two stages and the power indicators required by the T / R components are output. After switching and filtering by the T / R transceiver switch, the signals are output from the antenna port. The frequency source module provides the local oscillator signal for the mixer.

[0003] Receiving link: The RF signal received by the antenna port is sent to the bottom noise amplifier for signal amplification after filtering, transceiver switching, and limiting. After signal amplification, it is sent to the mixer through RF filtering to down-convert the RF signal to a 175 MHz intermediate frequency signal. After intermediate frequency amplification and intermediate frequency filtering, it is sent to the ADC chip. The ADC converts the analog intermediate frequency signal and outputs a digital signal to the FPGA. The FPGA performs digital down-conversion internally to output the baseband I / Q signal, which is then output to the main control module through the optical module for data processing. The frequency source module provides the local oscillator signal for the mixer.

[0004] The main disadvantages of the traditional multi-channel T / R component architecture are complex links, large size, high difficulty in design and debugging, increased product power consumption and cost, and increased difficulty in hardware development. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a miniaturized TR component based on FPGA radio frequency direct output.

[0006] The present invention is implemented by adopting the following technical scheme: a miniaturized TR component based on FPGA RF direct output, including an optical module, an FPGA module and multiple transceiver modules, one end of the optical module is connected to the main control module, and the other end is connected to the FPGA module, the FPGA module is respectively connected to multiple transceiver modules, each transceiver module includes a transmitting link and a receiving link, and the direct output and direct acquisition of L-band RF signals are respectively realized through the transmitting link and the receiving link.

[0007] Furthermore, the FPGA module adopts an RFSOPC chip, and the RFSOPC chip is provided with a RF direct-output architecture and a RF direct-acquisition architecture, wherein the RF direct-output architecture is connected to the transmitting link, and the RF direct-acquisition architecture is connected to the receiving link.

[0008] Furthermore, the RF direct output architecture includes a DCA digital-to-analog converter, an intermediate frequency filter and an up-converter connected in sequence, wherein the output end of the up-converter is connected to the transmission link.

[0009] Furthermore, the RF direct acquisition architecture includes an ADC digital-to-analog converter, an intermediate frequency filter and a down converter connected in sequence, wherein the input end of the down converter is connected to the receiving link.

[0010] Furthermore, the transceiver module also includes a transceiver switch and a filtering unit, wherein one end of the transceiver switch is connected to the transmitting link and the receiving link respectively, and the other end is connected to the filtering unit, and the filtering unit is connected to the antenna port.

[0011] Furthermore, the transmission link includes a filter, a driving amplifier and a power amplifier connected in sequence, wherein the input end of the filter is connected to the RF direct output architecture, and the output end of the power amplifier is connected to the transceiver switch.

[0012] Furthermore, the receiving link includes a filtering module, a low-noise amplification module and a limiting module which are connected in sequence, wherein the input end of the limiting module is connected to the transceiver switch, and the output end of the filtering module is connected to the RF direct acquisition architecture.

[0013] Furthermore, there are eight transceiver modules, which can realize an eight-channel L-band miniaturized digital TR component.

[0014] The beneficial effects of the present invention are: The present invention makes full use of the internal resources of the chip, realizes 8-channel RF direct output and direct acquisition technology, reduces hardware link devices, greatly reduces the size, weight and cost of the whole machine, and the miniaturized design has broad application prospects in the field of large phased arrays.

[0015] The size of a single-channel DAC circuit is about 20 mm * 20 mm = 400 mm 2 , the size of the intermediate frequency filter is about 30 mm * 20 mm = 600 mm 2 , the mixer circuit size is about 15 mm * 15 mm = 225 mm 2 , single channel area total 400mm 2 +600mm 2 +225mm 2 =1225mm 2 , 8 channels totaling 1225mm 2*8=9800mm 2 , plus the frequency source module size is about 100 mm * 50 mm = 5000 mm 2 8-channel T / R assembly RF direct-source circuit can save a total of 9800mm compared to traditional T / R assembly 2 +9800mm 2 +5000mm 2 =24600mm 2 The area of ​​traditional T / R components is about 320*200mm 2 =64000mm 2 , while the area of ​​RF direct output and direct purchase T / R components is about 64000mm 2 -24600mm 2 =39400mm 2 , the entire T / R component area is saved by 2 / 5.

[0016] The present invention makes full use of simplified circuit design, reduces the design difficulty of traditional solutions, and simplifies system synchronization. To achieve phase consistency in traditional architectures, the internal clock and local oscillator signal must be synchronized. The existing solution does not require a local oscillator signal, only clock synchronization is required. For phased array radar applications, the existing architecture is an effective choice for simplified design.

[0017] The present invention simplifies circuit design, can effectively improve the stability and reliability of equipment, and reduce the risk of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a traditional digital T / R component architecture; Figure 2 This is a schematic diagram of the present invention; Figure 3 This is the difference between the RF direct output architecture and the intermediate frequency architecture; Figure 4 This is a diagram showing the difference between the RF direct acquisition architecture and the intermediate frequency architecture. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] See also Figure 2 A miniaturized TR component based on FPGA RF direct output includes an optical module, an FPGA module and 8 transceiver modules. One end of the optical module is connected to the main control module, and the other end is connected to the FPGA module. The FPGA module is connected to multiple transceiver modules respectively, and each transceiver module includes a transmitting link and a receiving link. The direct output and direct acquisition of L-band RF signals are respectively realized through the transmitting link and the receiving link.

[0024] In this embodiment, the FPGA module uses the RFSOPC chip SMQZU48DRFFBG1760MP, which can realize the direct output of L-band RF signals and the receiving RF direct acquisition technology to realize an 8-channel L-band miniaturized digital TR component. The RFSOPC chip is provided with an RF direct output architecture and an RF direct acquisition architecture, wherein the RF direct output architecture is connected to the transmitting link, and the RF direct acquisition architecture is connected to the receiving link.

[0025] See also Figure 3 , the RF direct output architecture includes a DCA digital-to-analog converter, an intermediate frequency filter and an up-converter connected in sequence, where the output of the up-converter is connected to the transmit link. Advantages of RF direct output: The DAC, intermediate frequency filter and up-conversion in the traditional mode are directly integrated into the FPGA. The FPGA directly outputs the L-band RF signal, performs amplification, transceiver switching and output after filtering, avoiding the loss and path interference caused by multiple frequency conversions. The RFSOPC chip has a built-in 8-channel 14-bit DAC with a maximum sampling rate of 10GS / s, which realizes the direct output function of 8 RF signals, replacing the DAC, intermediate frequency filter and up-conversion devices in the original solution.

[0026] See also Figure 4The RF direct acquisition architecture includes an ADC digital-to-analog converter, an intermediate frequency filter, and a downconverter connected in sequence, wherein the input of the downconverter is connected to the receiving link. Advantages of RF direct acquisition: Downconversion, intermediate frequency filter, and ADC chip are directly integrated into the FPGA, and the RF signal is directly amplified and sent to the FPGA. The FPGA performs downconversion and outputs baseband I / Q signals, thus avoiding signal loss and path interference caused by multiple frequency conversions. The RFSOPC chip has a built-in 8-channel 14-bit ADC with a maximum sampling rate of 6GS / s, which realizes the direct acquisition function of 8-channel RF signals, replacing the ADC, intermediate frequency filter, and downconversion devices in the original solution.

[0027] In this embodiment, the transceiver module also includes a transceiver switch and a filter unit, wherein one end of the transceiver switch is respectively connected to the transmission link and the receiving link, and the other end is connected to the filter unit, and the filter unit is connected to the antenna port. The transmission link includes a filter, a driver amplifier and a power amplifier connected in sequence, wherein the input end of the filter is connected to the RF direct output architecture, and the output end of the power amplifier is connected to the transceiver switch. The receiving link includes a filter module, a low-noise amplifier module and a limiting module connected in sequence, wherein the input end of the limiting module is connected to the transceiver switch, and the output end of the filter module is connected to the RF direct acquisition architecture.

[0028] The working principle of the present invention is: Transmitting link: FPGA receives the I / Q weighted signals sent by the main control module through the optical module (optical fiber), as well as the transmission framework signals such as AM, ATT, and T / R. The I / Q weighted signals are processed by FPGA and directly output the L-band RF signal through the internal DAC digital-to-analog conversion. After filtering (filter), the RF signal is amplified in two stages (driver amplifier and power amplifier) ​​to output the power index required by the T / R component, and then output from the antenna port after switching the T / R transceiver switch and filtering (filter unit).

[0029] Receiving link: The RF signal received by the antenna port is sent to the low-noise amplifier for signal amplification after filtering (filter unit), transceiver switch, and limiting (limiting module). After signal amplification, the signal is directly sent to the ADC inside the FPGA for analog-to-digital conversion after passing through the RF filtering (filter module). The FPGA performs digital down-conversion to output the baseband I / Q signal, which is then output to the main control module through the optical module for data processing.

[0030] Based on the above embodiments, the present invention has at least the following technical effects: The present invention makes full use of the internal resources of the chip, realizes 8-channel RF direct output and direct acquisition technology, reduces hardware link devices, greatly reduces the size, weight and cost of the whole machine, and the miniaturized design has broad application prospects in the field of large phased arrays.

[0031] The size of a single-channel DAC circuit is about 20 mm * 20 mm = 400 mm 2 , the size of the intermediate frequency filter is about 30 mm * 20 mm = 600 mm 2 , the mixer circuit size is about 15 mm * 15 mm = 225 mm 2 , single channel area total 400mm 2 +600mm 2 +225mm 2 =1225mm 2 , 8 channels totaling 1225mm 2 *8=9800mm 2 , plus the frequency source module size is about 100 mm * 50 mm = 5000 mm 2 8-channel T / R assembly RF direct-source circuit can save a total of 9800mm compared to traditional T / R assembly 2 +9800mm 2 +5000mm 2 =24600mm 2 The area of ​​traditional T / R components is about 320*200mm 2 =64000mm 2 , while the area of ​​RF direct output and direct purchase T / R components is about 64000mm 2 -24600mm 2 =39400mm 2 , the entire T / R component area is saved by 2 / 5.

[0032] The present invention makes full use of simplified circuit design, reduces the design difficulty of traditional solutions, and simplifies system synchronization. To achieve phase consistency in traditional architectures, the internal clock and local oscillator signal must be synchronized. The existing solution does not require a local oscillator signal, only clock synchronization is required. For phased array radar applications, the existing architecture is an effective choice for simplified design.

[0033] The present invention simplifies circuit design, can effectively improve the stability and reliability of equipment, and reduce the risk of failure.

[0034] It should be noted that the terms "connection" and "setting" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "connection" and "setting" may explicitly or implicitly include one or more of the features. Moreover, the terms "connection", "setting" and the like are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. And for the aforementioned embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited to the described order of actions, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification belong to preferred embodiments, and the actions involved are not necessarily required by the present application.

[0035] For the aforementioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily required by the present application.

[0036] The above embodiments describe the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the changes and modifications made by those skilled in the art shall be within the scope of protection of the appended claims of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A miniaturized TR component based on FPGA RF direct output, characterized in that: It includes an optical module, an FPGA module and multiple transceiver modules. One end of the optical module is connected to the main control module, and the other end is connected to the FPGA module. The FPGA module is connected to multiple transceiver modules respectively. Each transceiver module includes a transmitting link and a receiving link. The direct output and direct acquisition of L-band RF signals are respectively realized through the transmitting link and the receiving link.

2. A miniaturized TR component based on FPGA RF direct output as claimed in claim 1, characterized in that: The FPGA module adopts an RFSOPC chip, and a RF direct output architecture and a RF direct acquisition architecture are arranged in the RFSOPC chip, wherein the RF direct output architecture is connected to the transmission link, and the RF direct acquisition architecture is connected to the receiving link.

3. A miniaturized TR component based on FPGA RF direct output as claimed in claim 2, characterized in that: The RF direct output architecture includes a DCA digital-to-analog converter, an intermediate frequency filter and an up-converter connected in sequence, wherein the output end of the up-converter is connected to a transmission link.

4. A miniaturized TR component based on FPGA RF direct output as claimed in claim 2, characterized in that: The RF direct acquisition architecture includes an ADC digital-to-analog converter, an intermediate frequency filter and a down converter connected in sequence, wherein the input end of the down converter is connected to the receiving link.

5. A miniaturized TR component based on FPGA RF direct output as claimed in claim 2, characterized in that: The transceiver module also includes a transceiver switch and a filter unit, wherein one end of the transceiver switch is connected to the transmission link and the reception link respectively, and the other end is connected to the filter unit, and the filter unit is connected to the antenna port.

6. A miniaturized TR component based on FPGA RF direct output as claimed in claim 5, characterized in that: The transmission link includes a filter, a driving amplifier and a power amplifier connected in sequence, wherein the input end of the filter is connected to the RF direct output architecture, and the output end of the power amplifier is connected to the transceiver switch.

7. A miniaturized TR component based on FPGA RF direct output as claimed in claim 5, characterized in that: The receiving link includes a filtering module, a low-noise amplification module and a limiting module which are connected in sequence, wherein the input end of the limiting module is connected to the transceiver switch, and the output end of the filtering module is connected to the RF direct acquisition architecture.

8. A miniaturized TR component based on FPGA RF direct output as claimed in claim 1, characterized in that: There are eight transceiver modules, which can realize an 8-channel L-band miniaturized digital TR component.

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