General frequency conversion VPX module

Abstract

The invention belongs to the technical field of airborne equipment, and provides a general frequency conversion VPX module, which comprises a local oscillator source, a transmitting frequency conversion channel and a receiving frequency conversion channel, and is characterized in that the local oscillator source is used for generating a fixed dot frequency local oscillator LO3, a frequency hopping source local oscillator signal LO2 and a frequency hopping source local oscillator signal LO1; the transmitting frequency conversion channel is used for combining transmitting intermediate-frequency inputs with different bandwidths and signals generated by the local oscillator source, and performing up-conversion to generate radio-frequency signals for output; and the receiving frequency conversion channel is used for combining the radio frequency signal with the signal generated by the local oscillator source, performing down-conversion to generate an intermediate frequency signal, and outputting the intermediate frequency signal according to a corresponding bandwidth. Based on the general frequency conversion VPX module provided by the invention, adaptive function adjustment can be carried out according to different requirements of the avionics system, so that the frequency conversion module resources can realize the effects of resource standardization, universalization, reconfigurability and low comprehensive cost in the next generation of airborne avionics system.

Description

Technical Field

[0001] The present invention relates to the technical field of airborne equipment, and in particular to a universal variable frequency VPX module. Background Art

[0002] At present, airborne avionics systems have developed from traditional discrete, joint, and integrated systems to advanced integrated systems. Advanced integrated system functions share aperture and RF resources, making the system more integrated and less expensive while meeting the requirements. In the future, airborne avionics systems will have higher functional integration and resource integration. Ideally, radar, communication navigation identification, electronic countermeasures and other functions will share a set of antenna aperture resources, RF resources and processing resources.

[0003] As an important part of the avionics system, the function and design of the frequency conversion module should be optimized and updated with the development of the avionics system. Therefore, the frequency conversion module based on the application of airborne avionics system needs to develop in the direction of ultra-wideband, multi-function and standardization.

[0004] Traditional airborne avionics systems are designed separately for radar, electronic countermeasures, and communication and navigation systems, and each subsystem has its own RF resources. Each function will be designed with a set of frequency conversion modules according to its own requirements. This design method leads to a wide variety of frequency conversion module designs for each function, high design costs, no interchangeability and reconfigurability, and it is difficult to meet the comprehensive requirements of antenna aperture and RF resources proposed by the next generation of airborne avionics systems.

[0005] From a functional perspective, different functions in the airborne avionics system have different requirements for the functions and indicators of the frequency conversion module, and the key points of the design are also different. The radar function requires the frequency conversion module to have extremely short transmission and reception switching time, multiple working bandwidths, and extremely low spurious. Communication navigation identification requires the frequency conversion module to have high linearity, large dynamic range, and high gain. The electronic countermeasure function requires the frequency conversion module to have an ultra-wide working bandwidth. Therefore, each function has different focuses when designing. If the design is not coordinated, the frequency conversion modules of each function cannot be reused in the avionics system.

[0006] From a structural perspective, the use environment and assembly requirements of each system are different, and the structural form of the module design is not unified. The modules will be designed with different sizes, different interface requirements and assembly requirements, making it impossible to achieve a unified design of the module structure.

[0007] From a cost perspective, the circuit design of the frequency conversion module for each function is different, and the chips, integrated modules and structural parts used are all developed and designed in a targeted manner, which leads to a direct accumulation of costs. Summary of the invention

[0008] In view of the defects in the prior art, the present invention provides a universal frequency conversion VPX module to solve the problem that the current frequency conversion module can only meet corresponding requirements in design and cannot achieve functional reuse, resulting in complex structure and high development cost.

[0009] The present invention provides a universal variable frequency VPX module, comprising: A local oscillator source, used to generate a fixed frequency local oscillator LO3, a frequency hopping source local oscillator signal LO2 and a frequency hopping source local oscillator signal LO1; A transmitting frequency conversion channel, used to combine the transmitting intermediate frequency input of different bandwidths with the signal generated by the local oscillator source, up-convert the frequency to generate a radio frequency signal for output; The receiving frequency conversion channel is used to combine the radio frequency signal with the signal generated by the local oscillator, down-convert the signal to generate an intermediate frequency signal, and output it according to the corresponding bandwidth.

[0010] Optionally, the transmitting frequency conversion channel is specifically used for: When in narrowband mode, the intermediate frequency input and the local oscillator LO3 / radar local oscillator signal II are up-converted to generate two intermediate frequency signals IF2, the two intermediate frequency signals IF2 and the local oscillator signal LO2 are up-converted to generate one intermediate frequency signal IF1, and the one intermediate frequency signal IF1 and the local oscillator LO1 / radar local oscillator signal are up-converted to generate a radio frequency signal; When in broadband mode, the two intermediate frequency signals IF2 and the local oscillator signal LO2 are up-converted to generate an intermediate frequency signal IF1, and the intermediate frequency signal IF1 and the local oscillator signal LO1 / radar local oscillator signal I are up-converted to generate a radio frequency signal.

[0011] Optionally, the receiving frequency conversion channel is specifically used for: When in narrowband mode, the RF signal and a local oscillator signal LO1 / radar local oscillator signal I are down-converted to generate an intermediate frequency signal IF1, the intermediate frequency signal IF1 and the local oscillator signal LO2 are down-converted to generate a second intermediate frequency signal IF2, and the second intermediate frequency signal IF2 and the local oscillator LO3 / radar local oscillator signal II are down-converted to generate an intermediate frequency output; When in broadband mode, the radio frequency signal and the local oscillator signal LO1 / radar local oscillator signal I are down-converted to generate an intermediate frequency signal IF1, and the intermediate frequency signal IF1 and the local oscillator signal LO2 are down-converted to generate an intermediate frequency output.

[0012] Optionally, the transmitting frequency conversion channel and the receiving frequency conversion channel are switched between a receiving mode and a transmitting mode based on a universal frequency conversion channel to achieve; The general frequency conversion channel includes a primary frequency conversion unit, a secondary frequency conversion unit and a channel selection unit. The primary frequency conversion unit is used to down-convert the radio frequency signal in combination with a local oscillator signal LO1 / radar local oscillator signal I to generate an intermediate frequency signal IF1, or to up-convert the intermediate frequency signal IF1 and the local oscillator LO1 / radar local oscillator signal to generate a radio frequency signal; The secondary frequency conversion unit is used to combine an intermediate frequency signal IF1 with a local oscillator signal LO2 to generate a second intermediate frequency signal IF2, or to combine two intermediate frequency signals IF2 with a local oscillator signal LO2 to generate an intermediate frequency signal IF1; The channel selection unit is used to select intermediate frequency inputs of different bandwidths, combine the intermediate frequency input with a local oscillator signal LO3 / radar local oscillator signal II to generate an intermediate frequency signal IF1, or to select different bandwidth outputs for the intermediate frequency signal IF2, or to select different bandwidth outputs after down-converting the intermediate frequency signal IF2.

[0013] Optionally, the channel selection unit includes a frequency conversion multifunctional chip, a bandwidth branch A and a bandwidth branch B, The frequency conversion multifunctional chip is used to down-convert the intermediate frequency signal IF2 to IF3±11MHz, or to up-convert the intermediate frequency input signal bandwidth IF3±11MHz to the intermediate frequency signal IF2; The bandwidth branch A and the bandwidth branch B are used to perform passband processing of different bandwidths on the signal.

[0014] Optionally, when the universal frequency conversion channel is in a receiving mode, the universal frequency conversion channel switches among an electronic countermeasure function, a communication and guidance function, and a radar function; When the universal frequency conversion channel is in the electronic countermeasure function, the 0.35-18 GHz radio frequency signal is down-converted to an intermediate frequency signal IF1, and then down-converted to a second intermediate frequency signal IF2 by the secondary frequency conversion unit. The second intermediate frequency signal IF2 is selected by the channel selection unit to output signals with different bandwidths; When the universal frequency conversion channel is in the conduction function, the radio frequency signal of the conduction frequency band is down-converted to the second intermediate frequency signal IF2 after passing through the primary frequency conversion unit and the secondary frequency conversion unit, and the intermediate frequency signal IF2 is down-converted to IF3 after passing through the channel selection unit; When the universal frequency conversion channel is in radar function, the RF signal in the radar frequency band is directly converted to the intermediate frequency signal IF2 by the primary frequency conversion unit, and is output after being down-converted by the channel selection unit.

[0015] Optionally, when the universal frequency conversion channel is in the transmission mode, the universal frequency conversion channel switches among the electronic countermeasure function, the communication and guidance function, and the radar function; When the universal frequency conversion channel is in the electronic countermeasure function, the intermediate frequency input selects the intermediate frequency signal IF2±200MHz or IF2±500MHz, and sequentially passes through the channel selection unit, the secondary frequency conversion unit and the primary frequency conversion unit to output the required electronic countermeasure frequency; When the universal frequency conversion channel is in the conduction function, the intermediate frequency input selects the intermediate frequency signal IF3±11MHz, which sequentially passes through the frequency conversion multifunctional chip, the secondary frequency conversion unit and the primary frequency conversion unit to output the required conduction frequency; When the universal frequency conversion channel is in radar function, the intermediate frequency input selects the intermediate frequency signal IF3±11MHz, which passes through the frequency conversion multifunctional chip, the secondary frequency conversion unit and the primary frequency conversion unit in sequence to output the required radar frequency; or the intermediate frequency input selects the intermediate frequency signal IF2±500MHz, which passes through the channel selection unit, the secondary frequency conversion unit and the primary frequency conversion unit in sequence to output the required radar frequency.

[0016] Optionally, the local oscillator source is specifically used for: Based on the 100MHz clock signal, a fixed local oscillator signal LO3 is generated through a phase-locked loop; Based on the 100MHz clock signal, the frequency hopping local oscillator signal LO2 is generated by implementing small step frequency hopping through a ping-pong loop; Based on the 100MHz clock signal, large-step frequency hopping is achieved through a ping-pong loop, and a frequency-hopping local oscillator signal LO1 is generated through a frequency multiplier and a local oscillator switch filter group SIP.

[0017] Optionally, it further comprises a clock distribution circuit and a radar distribution circuit, wherein the clock distribution circuit serves as a reference signal of the local oscillator source, and the radar distribution circuit is switched and used by the local oscillator source when the universal frequency conversion channel is in radar function; The clock distribution circuit is used to divide the external 100MHz clock signal into four paths REF_1~REF_4; The radar distribution circuit is used to divide the radar local oscillator signal into four paths LO_RD_1~LO_RD_4.

[0018] By adopting the above technical solution, the present application has the following beneficial effects: Based on the universal frequency conversion VPX module provided by the present invention, adaptive function adjustment can be performed according to different requirements of the avionics system, so that the frequency conversion module resources can achieve resource standardization, generalization, reconfiguration, and low comprehensive cost in the next generation of airborne avionics systems; The chips and modules used in the design of each transceiver channel of the present invention are completely consistent, and a replica design can be achieved; The present invention can satisfy the use of different functions. When corresponding to different functions, the modules no longer need to be re-customized, and only the frequency conversion resources required for each function need to be counted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0020] Figure 1 A schematic diagram of a general variable frequency VPX module provided by an embodiment of the present invention is shown; Figure 2 A schematic diagram of a universal frequency conversion channel provided by an embodiment of the present invention is shown; Figure 3a A schematic diagram of a primary frequency conversion unit provided in an embodiment of the present invention is shown; Figure 3b A schematic diagram of a secondary frequency conversion unit provided in an embodiment of the present invention is shown; Figure 3c A schematic diagram of a channel selection unit provided by an embodiment of the present invention is shown; Figure 4 A schematic diagram of a local oscillator source provided by an embodiment of the present invention is shown; Figure 5 A schematic diagram of a clock distribution circuit / radar distribution circuit provided in an embodiment of the present invention is shown; Figure 6 The figure shows a schematic diagram of the appearance structure of a universal variable frequency VPX module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the invention belongs.

[0022] In one embodiment, Figure 1 As shown, a universal variable frequency VPX module is provided, comprising: A local oscillator source, used to generate a fixed frequency local oscillator LO3, a frequency hopping source local oscillator signal LO2 and a frequency hopping source local oscillator signal LO1; The transmit frequency conversion channel is used to combine the transmit intermediate frequency input of different bandwidths with the signal generated by the local oscillator source, and up-convert the frequency to generate a radio frequency signal for output; The receiving frequency conversion channel is used to combine the RF signal with the signal generated by the local oscillator, down-convert it to generate an intermediate frequency signal, and output it according to the corresponding bandwidth.

[0023] Figure 1 It includes 2 transmit frequency conversion channels, 8 receive frequency conversion channels and 4 local oscillator sources. Each transmit frequency conversion channel has a narrowband transmission mode and a broadband transmission mode. The transmit frequency conversion channel is specifically used for: When in narrowband mode, the transmit frequency conversion channel selects a 22 MHz narrowband passband, and the transmit intermediate frequency input and local oscillator signal LO3 / radar local oscillator signal II are up-converted to generate two intermediate frequency signals IF2, the two intermediate frequency signals IF2 and the local oscillator signal LO2 are up-converted to generate one intermediate frequency signal IF1, and one intermediate frequency signal IF1 and the local oscillator LO1 / radar local oscillator signal are up-converted to generate a radio frequency signal.

[0024] When in broadband mode, the transmit frequency conversion channel selects a bandwidth of 400MHz or 1000MHz passband, and the transmit intermediate frequency input is directly up-converted with the second local oscillator signal LO2 to generate an intermediate frequency signal IF1, and an intermediate frequency signal IF1 and the local oscillator signal LO1 / radar local oscillator signal I are up-converted to generate a radio frequency signal.

[0025] The receiving frequency conversion channel also has broadband mode and narrowband mode. The design principle is the same as that of the transmitting channel, but the signal flow is opposite. The receiving frequency conversion channel is specifically used for: When in narrowband mode, the RF signal and a local oscillator signal LO1 / radar local oscillator signal I are down-converted to generate an intermediate frequency signal IF1, the intermediate frequency signal IF1 and the local oscillator signal LO2 are down-converted to generate a second intermediate frequency signal IF2, and the second intermediate frequency signal IF2 and the local oscillator LO3 / radar local oscillator signal II are down-converted to generate an intermediate frequency output; When in broadband mode, the radio frequency signal and the local oscillator signal LO1 / radar local oscillator signal I are down-converted to generate an intermediate frequency signal IF1, and the intermediate frequency signal IF1 and the local oscillator signal LO2 are down-converted to generate an intermediate frequency output.

[0026] The transmitting frequency conversion channel and the receiving frequency conversion channel are realized by switching between the receiving mode and the transmitting mode based on the universal frequency conversion channel; specifically, the universal frequency conversion channel is configured as the transmitting frequency conversion channel or the receiving frequency conversion channel by changing the transmission direction of the bidirectional amplifier.

[0027] like Figure 2 As shown, the universal frequency conversion channel includes a primary frequency conversion unit, a secondary frequency conversion unit and a channel selection unit, wherein the primary frequency conversion unit mainly includes a preselection switch filter group SIP, and a frequency conversion multifunctional chip A and other devices. The secondary frequency conversion unit includes a switch selection and frequency conversion multifunctional chip B and other devices. The channel selection unit includes a radio frequency switch filter group SIP, a switch selection and frequency conversion multifunctional chip C and a filter and a bidirectional amplifier and other devices. After changing the transmission direction of the bidirectional amplifier, switching between the transmitting frequency conversion channel or the receiving frequency conversion channel can be performed.

[0028] See also Figure 3aThe primary frequency conversion unit is used to down-convert the RF signal in combination with a local oscillator signal LO1 / radar local oscillator signal I to generate an intermediate frequency signal IF1, or to up-convert the intermediate frequency signal IF1 and the local oscillator LO1 / radar local oscillator signal to generate a RF signal.

[0029] See also Figure 3b The secondary frequency conversion unit is used to combine an intermediate frequency signal IF1 with a local oscillator signal LO2 to generate a second intermediate frequency signal IF2, or to combine two intermediate frequency signals IF2 with a local oscillator signal LO2 to generate an intermediate frequency signal IF1.

[0030] See also Figure 3c The channel selection unit is used to select intermediate frequency inputs of different bandwidths, combine the intermediate frequency input with a local oscillator signal LO3 / radar local oscillator signal II to generate an intermediate frequency signal IF1, or to select different bandwidth outputs for the intermediate frequency signal IF2, or to select different bandwidth outputs after down-converting the intermediate frequency signal IF2.

[0031] The channel selection unit includes a frequency conversion multifunctional chip C, a bandwidth branch A and a bandwidth branch B. The frequency conversion multifunctional chip C is used for down-converting the intermediate frequency signal IF2 to IF3±11MHz, or for up-converting the intermediate frequency input signal bandwidth IF3±11MHz to the intermediate frequency signal IF2; Bandwidth branch A and bandwidth branch B are used to perform passband processing of signals with different bandwidths. Specifically, bandwidth branch A can realize output of a channel with a bandwidth of 400 MHz, and bandwidth branch B can realize output of a channel with a bandwidth of 1000 MHz.

[0032] When the universal frequency conversion channel is in the receiving mode, the universal frequency conversion channel switches among the electronic countermeasure function, communication and guidance function, and radar function; When the universal frequency conversion channel is in the electronic countermeasure function, the 0.35~18GHz RF signal is down-converted to an intermediate frequency signal IF1, and then down-converted to a second intermediate frequency signal IF2 through a secondary frequency conversion unit. The second intermediate frequency signal IF2 is output by selecting signals of different bandwidths through a channel selection unit; When the universal frequency conversion channel is in the pass-through function, the RF signal of the pass-through frequency band is down-converted to the second intermediate frequency signal IF2 after passing through the primary frequency conversion unit and the secondary frequency conversion unit, and the intermediate frequency signal IF2 is down-converted to IF3 after passing through the channel selection unit; When the universal frequency conversion channel is in radar function, the RF signal of the radar frequency band is directly converted to the intermediate frequency signal IF2 by the primary frequency conversion unit, and then output after being down-converted by the channel selection unit.

[0033] When the general frequency conversion channel is in the transmission mode, the general frequency conversion channel switches among the electronic countermeasure function, communication and guidance function, and radar function; When the universal frequency conversion channel is in the electronic countermeasure function, the intermediate frequency input selects the intermediate frequency signal IF2±200MHz or IF2±500MHz, and sequentially passes through the channel selection unit, the secondary frequency conversion unit and the primary frequency conversion unit to output the required electronic countermeasure frequency; When the universal frequency conversion channel is in the conduction function, the intermediate frequency input selects the intermediate frequency signal IF3±11MHz, which passes through the frequency conversion multifunctional chip C, the secondary frequency conversion unit and the primary frequency conversion unit in turn to output the required conduction frequency; When the universal frequency conversion channel is in radar function, the intermediate frequency input selects the intermediate frequency signal IF3±11MHz, which passes through the frequency conversion multifunctional chip C, the secondary frequency conversion unit and the primary frequency conversion unit in sequence to output the required radar frequency; or the intermediate frequency input selects the intermediate frequency signal IF2±500MHz, which passes through the channel selection unit, the secondary frequency conversion unit and the primary frequency conversion unit in sequence to output the required radar frequency.

[0034] In specific use, when the general frequency conversion channel is in the receiving mode, the frequency conversion module can meet the needs of three avionics functions.

[0035] When the frequency conversion module is in the electronic countermeasure function, the 0.35~18GHz RF signal is down-converted to an intermediate frequency signal IF1. Then it is down-converted to a second intermediate frequency signal IF2 through the secondary frequency conversion unit. The second intermediate frequency signal IF2 will select signals with different bandwidths for output through the channel selection unit. The bandwidth types are 1000MHz, 400MHz, and 22MHz. When working in the electronic countermeasure function 1, the intermediate frequency signal IF2 selects a channel with a bandwidth of 1000MHz for output. When working in the electronic countermeasure function 2, the intermediate frequency signal IF2 selects a channel with a bandwidth of 400MHz for output.

[0036] When the frequency conversion channel is in the conduction function, the RF signal of the conduction frequency band is down-converted to the second intermediate frequency signal IF2 after passing through the primary frequency conversion unit and the secondary frequency conversion unit. The intermediate frequency signal IF2 is down-converted to IF3±11MHz by the down-conversion multifunctional chip C.

[0037] When the frequency conversion channel is in radar function, the local oscillator source is switched to the external radar local oscillator. When in radar function 1, the RF signal of the radar band is directly converted to the intermediate frequency signal IF2 through the primary frequency conversion unit, and the intermediate frequency signal F2 is down-converted to IF3±11MHz by the down-conversion multifunctional chip C and then output. When in radar function 2, the RF signal of the radar band is directly converted to the intermediate frequency signal IF2 through the primary frequency conversion unit, and the intermediate frequency signal IF2 is output by selecting the IF2±500MHz channel through the channel selection unit.

[0038] When the universal frequency conversion channel is in the transmitting mode, the external intermediate frequency input signal has three modes: IF3±11MHz, IF2±500MHz and IF2±200MHz.

[0039] When the frequency conversion module is in the electronic countermeasure function 1, the intermediate frequency input selects the IF2±200MHz signal bandwidth, and the input signal outputs the required electronic countermeasure frequency through the channel selection unit, the secondary frequency conversion unit, and the transmission mode of the primary frequency conversion unit. When the frequency conversion module is in the electronic countermeasure function 2, the intermediate frequency input selects the IF2±500MHz signal bandwidth, and the input signal outputs the required electronic countermeasure frequency through the channel selection unit, the secondary frequency conversion unit, and the transmission mode of the primary frequency conversion unit.

[0040] When the frequency conversion module is in the conduction function, the intermediate frequency input selects the IF3±11MHZ signal bandwidth, and the input signal passes through the frequency conversion multifunctional chip C in the channel selection unit, the secondary frequency conversion unit, and the primary frequency conversion unit's transmission mode to output the required conduction frequency.

[0041] When the frequency conversion module is in radar function 1, the intermediate frequency input selects IF3±11MHz signal bandwidth, and the input signal passes through the frequency conversion multifunctional chip C of the channel selection unit, the direct channel of the secondary frequency conversion unit, and the transmission mode of the primary frequency conversion unit to output the required radar frequency. When the frequency conversion module is in radar function 2, the intermediate frequency input selects IF2±500MHz signal bandwidth, and the input signal passes through the channel selection unit, the direct channel of the secondary frequency conversion unit, and the transmission mode of the primary frequency conversion unit to output the required radar frequency.

[0042] Figure 1 Four local oscillator sources are shown in total, each of which generates a fixed frequency local oscillator LO3 and two frequency hopping source local oscillator signals LO2 and LO1. The frequency modulated local oscillator signal can achieve a rapid frequency modulation of 25,000 times. When the universal frequency conversion VPX module is in radar function, it directly switches to the external radar local oscillator source; when the universal frequency conversion VPX module is in the conduction function or electronic countermeasure function, it directly uses the internal local oscillator source. Figure 4 As shown, the local oscillator source is specifically used for: Based on a 100MHz clock signal, a signal is generated through a phase-locked loop and then passes through a frequency multiplier to generate a fixed local oscillator signal LO3; the system includes components such as a phase-locked loop, a frequency multiplier, a filter, and an attenuation amplifier.

[0043] Based on the 100MHz clock signal, the frequency hopping local oscillator signal LO2 is generated by a ping-pong loop to achieve small step frequency hopping. The local oscillator signal LO2 includes two phase-locked loops, switches, frequency multipliers, filters, attenuation amplifiers and other devices. The second local oscillator signal LO2 uses two phase-locked loops and a switch to form a ping-pong loop to achieve small step frequency hopping within 5M. The generated signal is filtered by frequency multiplication to form the second local oscillator signal LO2 with small frequency hopping steps.

[0044] Based on the 100MHz clock signal, the 18G broadband large-step frequency hopping is realized through the ping-pong loop structure, and the frequency hopping local oscillator signal LO1 is generated through the frequency multiplier and the local oscillator switch filter group SIP. The local oscillator signal LO1 contains two phase-locked loops, switches, frequency multipliers, local oscillator switch filter group SIP and attenuation amplifiers.

[0045] like Figure 1 As shown, the universal frequency conversion VPX module also includes a clock distribution circuit and a radar distribution circuit. The clock distribution circuit serves as a reference signal of the local oscillator source, and the radar distribution circuit is switched by the local oscillator source when the universal frequency conversion channel is in the radar function.

[0046] like Figure 5 As shown, the clock distribution circuit is used to divide the external 100MHz clock signal into four paths REF_1~REF_4 for use by four local oscillator sources respectively; the radar distribution circuit is used to divide the radar local oscillator signal into four groups LO_RD_1~LO_RD_4, each group of radar local oscillators includes radar local oscillator signal I and radar local oscillator signal II.

[0047] Depend on Figure 1 It can be seen that the general frequency conversion VPX module needs to place 10 channels and 4 local oscillators in a limited space. In order to meet the design requirements, multi-function chips and customized chips are required. Multi-function chips include Figure 2 The frequency conversion multifunctional chip A, frequency conversion multifunctional chip B, frequency conversion multifunctional chip C, bidirectional amplifier chip, etc. The customized chips include multiple types of filter group SIP chips. Based on the highly integrated chip, it can ensure the miniaturization design of each frequency conversion channel and local oscillator source. At the same time, the unified design can ensure that the frequency conversion module uses the same chip and module in the up-conversion channel and the down-conversion channel, reducing the types of modules and reducing the frequency conversion channel cost of the entire system.

[0048] Specifically, the universal frequency conversion VPX module provided in this embodiment adopts a standard VPX connector and is suitable for a 6U standard chassis. The module appearance and internal design used for the three subsystem functions are consistent. It can achieve good scalability and reconfiguration in the airborne avionics system. The structure diagram of the universal frequency conversion VPX module is shown in the figure. Figure 6 shown.

[0049] The above embodiments are only used to introduce the technical solutions of the present application in detail, but the description of the above embodiments is only used to help understand the methods of the embodiments of the present invention and should not be understood as limiting the embodiments of the present invention. Any changes or substitutions that can be easily thought of by those skilled in the art should be included in the protection scope of the embodiments of the present invention.

Claims

1. A universal variable frequency VPX module, characterized in that: include: A local oscillator source, used to generate a fixed frequency local oscillator LO3, a frequency hopping source local oscillator signal LO2 and a frequency hopping source local oscillator signal LO1; A transmitting frequency conversion channel, used to combine the transmitting intermediate frequency input of different bandwidths with the signal generated by the local oscillator source, up-convert the frequency to generate a radio frequency signal for output; The receiving frequency conversion channel is used to combine the radio frequency signal with the signal generated by the local oscillator, down-convert the signal to generate an intermediate frequency signal, and output it according to the corresponding bandwidth.

2. The universal variable frequency VPX module according to claim 1, characterized in that: The transmitting frequency conversion channel is specifically used for: When in narrowband mode, the transmitting intermediate frequency input and the local oscillator LO3 / radar local oscillator signal II are up-converted to generate the second intermediate frequency signal IF2, the second intermediate frequency signal IF2 and the local oscillator signal LO2 are up-converted to generate the first intermediate frequency signal IF1, and the first intermediate frequency signal IF1 and the local oscillator LO1 / radar local oscillator signal are up-converted to generate the radio frequency signal; When in broadband mode, the transmitting intermediate frequency input and the local oscillator signal LO2 are up-converted to generate an intermediate frequency signal IF1, and an intermediate frequency signal IF1 and the local oscillator signal LO1 / radar local oscillator signal I are up-converted to generate a radio frequency signal.

3. The universal variable frequency VPX module according to claim 2, characterized in that: The receiving frequency conversion channel is specifically used for: When in narrowband mode, the RF signal and a local oscillator signal LO1 / radar local oscillator signal I are down-converted to generate an intermediate frequency signal IF1, the intermediate frequency signal IF1 and the local oscillator signal LO2 are down-converted to generate a second intermediate frequency signal IF2, and the second intermediate frequency signal IF2 and the local oscillator LO3 / radar local oscillator signal II are down-converted to generate an intermediate frequency output; When in broadband mode, the radio frequency signal and the local oscillator signal LO1 / radar local oscillator signal I are down-converted to generate an intermediate frequency signal IF1, and the intermediate frequency signal IF1 and the local oscillator signal LO2 are down-converted to generate an intermediate frequency output.

4. The universal variable frequency VPX module according to claim 3, characterized in that: The transmitting frequency conversion channel and the receiving frequency conversion channel are switched between the receiving mode and the transmitting mode based on the universal frequency conversion channel to achieve; The universal frequency conversion channel includes a primary frequency conversion unit, a secondary frequency conversion unit and a channel selection unit. The primary frequency conversion unit is used to down-convert the RF signal in combination with a local oscillator signal LO1 / radar local oscillator signal I to generate an intermediate frequency signal IF1, or to up-convert the intermediate frequency signal IF1 and the local oscillator LO1 / radar local oscillator signal to generate a RF signal; The secondary frequency conversion unit is used to combine an intermediate frequency signal IF1 with a local oscillator signal LO2 to generate a second intermediate frequency signal IF2, or to combine two intermediate frequency signals IF2 with a local oscillator signal LO2 to generate an intermediate frequency signal IF1; The channel selection unit is used to select intermediate frequency inputs of different bandwidths, combine the intermediate frequency input with a local oscillator signal LO3 / radar local oscillator signal II to generate an intermediate frequency signal IF1, or to select different bandwidth outputs for the intermediate frequency signal IF2, or to select different bandwidth outputs after down-converting the intermediate frequency signal IF2.

5. The universal variable frequency VPX module according to claim 4, characterized in that: The channel selection unit includes a frequency conversion multifunctional chip, a bandwidth branch A and a bandwidth branch B. The frequency conversion multifunctional chip is used to down-convert the intermediate frequency signal IF2 to IF3±11MHz, or to up-convert the intermediate frequency input signal bandwidth IF3±11MHz to the intermediate frequency signal IF2; The bandwidth branch A and the bandwidth branch B are used to perform passband processing of different bandwidths on the signal.

6. The universal variable frequency VPX module according to claim 5, characterized in that: When the universal frequency conversion channel is in the receiving mode, the universal frequency conversion channel switches among the electronic countermeasure function, the communication and guidance function, and the radar function; When the universal frequency conversion channel is in the electronic countermeasure function, the 0.35-18 GHz radio frequency signal is down-converted to an intermediate frequency signal IF1, and then down-converted to a second intermediate frequency signal IF2 by the secondary frequency conversion unit. The second intermediate frequency signal IF2 is selected by the channel selection unit to output signals with different bandwidths; When the universal frequency conversion channel is in the conduction function, the radio frequency signal of the conduction frequency band is down-converted to the second intermediate frequency signal IF2 after passing through the primary frequency conversion unit and the secondary frequency conversion unit, and the intermediate frequency signal IF2 is down-converted to IF3 after passing through the channel selection unit; When the universal frequency conversion channel is in radar function, the RF signal in the radar frequency band is directly converted to the intermediate frequency signal IF2 by the primary frequency conversion unit, and is output after being down-converted by the channel selection unit.

7. The universal variable frequency VPX module according to claim 6, characterized in that: When the universal frequency conversion channel is in the transmission mode, the universal frequency conversion channel switches among the electronic countermeasure function, the communication and guidance function, and the radar function; When the universal frequency conversion channel is in the electronic countermeasure function, the intermediate frequency input selects the intermediate frequency signal IF2±200MHz or IF2±500MHz, and sequentially passes through the channel selection unit, the secondary frequency conversion unit and the primary frequency conversion unit to output the required electronic countermeasure frequency; When the universal frequency conversion channel is in the conduction function, the intermediate frequency input selects the intermediate frequency signal IF3±11MHz, which sequentially passes through the frequency conversion multifunctional chip, the secondary frequency conversion unit and the primary frequency conversion unit to output the required conduction frequency; When the universal frequency conversion channel is in radar function, the intermediate frequency input selects the intermediate frequency signal IF3±11MHz, which passes through the frequency conversion multifunctional chip, the secondary frequency conversion unit and the primary frequency conversion unit in sequence to output the required radar frequency; or the intermediate frequency input selects the intermediate frequency signal IF2±500MHz, which passes through the channel selection unit, the secondary frequency conversion unit and the primary frequency conversion unit in sequence to output the required radar frequency.

8. The universal variable frequency VPX module according to claim 3, characterized in that: The local oscillator source is specifically used for: Based on the 100MHz clock signal, a fixed local oscillator signal LO3 is generated through a phase-locked loop; Based on the 100MHz clock signal, the frequency hopping local oscillator signal LO2 is generated by implementing small step frequency hopping through a ping-pong loop; Based on the 100MHz clock signal, large-step frequency hopping is achieved through a ping-pong loop, and a frequency-hopping local oscillator signal LO1 is generated through a frequency multiplier and a local oscillator switch filter group SIP.

9. The universal variable frequency VPX module according to claim 1, characterized in that: It also includes a clock distribution circuit and a radar distribution circuit, wherein the clock distribution circuit serves as a reference signal of the local oscillator source, and the radar distribution circuit is switched and used by the local oscillator source when the universal frequency conversion channel is in the radar function; The clock distribution circuit is used to divide the external 100MHz clock signal into four paths REF_1~REF_4; The radar distribution circuit is used to divide the radar local oscillator signal into four paths LO_RD_1~LO_RD_4.

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