Multiplexing type multichannel receiving system

Abstract

The utility model provides a multiplexing multichannel receiving system, and relates to the technical field of wireless signals. The system comprises a channel receiver, a first local oscillator power division network, a second local oscillator power division network and a frequency synthesizer. Wherein radio frequency reconstruction of the N sum wave channel basic units and the N difference wave channel basic units is realized through a radio frequency switch in the receiver; the consistency of channel phases in two states is ensured through a power divider in the receiver; full exchange multiplexing of local oscillation signals generated by the two frequency sources is ensured through a matrix switch in the frequency synthesizer; according to the utility model, under the condition that the hardware scale is reduced to half, two systems are compatible; as the number of channels of the channel receiver is reduced, the scale of the local oscillator power division network is also reduced, and the occupied space size of the local oscillator power division network is effectively reduced; therefore, the method has an important application value and a wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of wireless signal technology, and in particular to a multiplexed multi-channel receiving system. Background Technology

[0002] Multifunctional phased array radars typically employ a monopulse system. To improve radar detection performance and expand functionality, compatibility with dual-frequency or multi-frequency beam systems is an effective solution.

[0003] When a dual-frequency system is compatible with a single-pulse system, the single-pulse system needs to process N sum beam signals and N difference beam signals, and the number of channels in the channel receiver is 2×N. If a dual-frequency system in the digital domain is used, the frequency interval between the dual-frequency signals is small due to the limitations of the receiving dynamic range requirements and the instantaneous bandwidth, which will cause inter-frequency signal interference.

[0004] If a dual-frequency system in the analog domain is adopted, the echo signal is mixed with the local oscillator signals of two frequencies, which satisfies the small instantaneous bandwidth while taking into account the large frequency interval of the dual-frequency signals. However, the number of channels of the channel receiver increases to 4×N, the hardware size doubles, and the size and cost of the equipment are greatly increased.

[0005] Therefore, there is a need to provide a multiplexed multi-channel receiving system to solve the technical problems of inter-frequency signal interference in the existing single-pulse system and the large hardware scale of the analog dual-frequency system. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple-to-operate multiplexed multi-channel receiving system. Using the concept of radio frequency reconfiguration, the operating state of the receiving system is adjusted by radio frequency switches, so that it can be adapted to single-pulse measurement system and dual-frequency system after online reconfiguration.

[0007] To achieve the above objectives, this application proposes a multiplexed multichannel receiving system, characterized by comprising a channel receiver, a first local oscillator power divider network, a second local oscillator power divider network, and a frequency synthesizer; wherein,

[0008] The channel receiver comprises N basic units for summation channels and N basic units for difference channels; wherein...

[0009] The differential beam channel basic unit includes a first low-noise amplifier, a first power divider, a first switch, a first mixer component, and a first AD converter; wherein, the input terminal of the first low-noise amplifier receives the differential beam signal and is electrically connected to the input terminal of the first power divider through its output terminal;

[0010] The first power divider is a 1-to-2 power divider, and the first switch is a dual-terminal selection switch, including a selection terminal A, a selection terminal B, and an output terminal C; wherein, the output terminal of the first power divider is electrically connected to the selection terminal A, and the first AD converter, the first mixer component, and the output terminal C are connected in series in sequence.

[0011] The basic unit of the sum-beam channel includes a second low-noise amplifier, a second power divider, a second switch, a second mixer component, and a second AD converter; wherein, the input terminal of the second low-noise amplifier receives the sum-beam signal and is electrically connected to the input terminal of the second power divider through its output terminal;

[0012] The second power divider is a 1-to-2 power divider, and the second switch is a dual-terminal selection switch, including a selection terminal D, a selection terminal E, and an output terminal F; wherein, the output terminal of the second power divider is electrically connected to the selection terminal B and the selection terminal D respectively, and the second AD converter, the second mixer component, and the output terminal F are connected in series in sequence.

[0013] The first local oscillator power divider network includes a first local oscillator power divider input terminal and N local oscillator power divider output terminals; wherein, the local oscillator power divider output terminals are electrically connected to the first mixer component; the second local oscillator power divider network includes a second local oscillator power divider input terminal and N local oscillator power divider output terminals; wherein, the local oscillator power divider output terminals are electrically connected to the second mixer component.

[0014] The frequency synthesizer includes a first frequency source, a second frequency source, and a matrix switch; wherein, the matrix switch includes a first switch input terminal, a second switch input terminal, a first switch output terminal, and a second switch output terminal; the first frequency source is electrically connected to the first switch input terminal, the second frequency source is electrically connected to the second switch input terminal, the first switch output terminal is electrically connected to the first local oscillator power input terminal, and the second switch output terminal is electrically connected to the second local oscillator power input terminal.

[0015] As a further solution, the matrix switch includes a third power divider, a fourth power divider, a third switch, and a fourth switch; wherein,

[0016] The third power divider is a 1-to-2 power divider, and the third switch is a dual-terminal selection switch, including selection terminal b, selection terminal c, and output terminal a;

[0017] The fourth power divider is a 1-to-2 power divider, and the fourth switch is a dual-terminal selection switch, including a selection terminal e, a selection terminal f, and an output terminal d.

[0018] The third power divider is electrically connected to the input of the first switch, and its output is electrically connected to the selection b and selection e terminals respectively. The fourth power divider is electrically connected to the input of the second switch, and its output is electrically connected to the selection c and selection f terminals respectively. The output a terminal is electrically connected to the output of the first switch, and the output d terminal is electrically connected to the output of the second switch.

[0019] As a further solution, when operating in single-pulse mode...

[0020] The selection terminal A of the first switch for selecting the basic unit of each difference channel of the channel receiver, and the selection terminal D of the second switch for selecting the basic unit of each sum channel of the channel receiver;

[0021] The matrix switch of the frequency synthesizer selects the b terminal of the third switch and outputs the first local oscillator signal to the first local oscillator power divider network;

[0022] The matrix switch of the frequency synthesizer selects the e-terminal of the fourth switch and outputs the second local oscillator signal to the second local oscillator power divider network.

[0023] As a further solution, when operating in dual-band mode...

[0024] The selection terminal B of the first switch for selecting each differential channel basic unit of the channel receiver, and the selection terminal D of the second switch for selecting each sum channel basic unit of the channel receiver;

[0025] The matrix switch of the frequency synthesizer selects the b terminal of the third switch and outputs the first local oscillator signal to the first local oscillator power divider network;

[0026] The matrix switch of the frequency synthesizer selects the f terminal of the fourth switch and outputs the second local oscillator signal to the second local oscillator power divider network.

[0027] As a further solution, the differential channel basic unit is also provided with a first load; wherein the output terminal of the first power divider is electrically connected to the first load and the selection A terminal respectively.

[0028] As a further solution, the basic unit of the sum channel is also provided with a second load; wherein the second load is electrically connected to the selected E terminal.

[0029] As a further solution, the first mixing component and the second mixing component adopt the same mixing component structure, including a mixer, a filter and an amplifier connected in series.

[0030] As a further solution, both the first and second frequency sources are direct synthesis frequency sources based on DDS technology.

[0031] Compared with related technologies, the multiplexed multichannel receiving system provided by this utility model has the following advantages:

[0032] This utility model system includes a channel receiver, a first local oscillator power divider network, a second local oscillator power divider network, and a frequency synthesizer. The receiver's internal RF switches enable RF reconfiguration of N sum-wave channel basic units and N difference-wave channel basic units. The internal power divider ensures channel phase consistency in both states. The frequency synthesizer's internal matrix switches ensure full switching and multiplexing of the local oscillator signals generated by the two frequency sources. This utility model achieves half the hardware size while remaining compatible with two systems. Furthermore, due to the reduction in the number of channels in the channel receiver, the size of the local oscillator power divider network is also reduced, effectively minimizing its footprint. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the structure of a multiplexed multichannel receiving system provided by this utility model;

[0036] Figure 2 A schematic diagram of the structure of this utility model when it is working in single-pulse mode;

[0037] Figure 3 This is a schematic diagram of the structure of the present invention when operating in dual-frequency mode.

[0038] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Please see Figure 1 This application provides a multiplexed multi-channel receiving system, including a channel receiver, a first local oscillator power divider network, a second local oscillator power divider network, and a frequency synthesizer; wherein,

[0041] The channel receiver comprises N basic units for summation channels and N basic units for difference channels; among which,

[0042] The basic unit of the difference channel includes a first low-noise amplifier, a first power divider, a first switch, a first mixer component, and a first AD converter; wherein, the input terminal of the first low-noise amplifier receives the difference beam signal and is electrically connected to the input terminal of the first power divider through its output terminal;

[0043] The first power divider is a 1-to-2 power divider, and the first switch is a dual-terminal selection switch, including a selection terminal A, a selection terminal B, and an output terminal C; wherein, the output terminal of the first power divider is electrically connected to the selection terminal A, and the first AD converter, the first mixer component, and the output terminal C are connected in series and electrically.

[0044] The basic unit of the sum-beam channel includes a second low-noise amplifier, a second power divider, a second switch, a second mixer component, and a second AD converter; wherein, the input terminal of the second low-noise amplifier receives the sum-beam signal and is electrically connected to the input terminal of the second power divider through its output terminal;

[0045] The second power divider is a 1-to-2 power divider, and the second switch is a dual-terminal selection switch, including a selection terminal D, a selection terminal E, and an output terminal F; wherein, the output terminal of the second power divider is electrically connected to the selection terminal B and the selection terminal D respectively, and the second AD converter, the second mixer component, and the output terminal F are connected in series in sequence.

[0046] The first local oscillator power divider network includes a first local oscillator power divider input terminal and N local oscillator power divider output terminals; wherein, the local oscillator power divider output terminals are electrically connected to the first mixer component; the second local oscillator power divider network includes a second local oscillator power divider input terminal and N local oscillator power divider output terminals; wherein, the local oscillator power divider output terminals are electrically connected to the second mixer component.

[0047] The frequency synthesizer includes a first frequency source, a second frequency source, and a matrix switch; wherein, the matrix switch includes a first switch input terminal, a second switch input terminal, a first switch output terminal, and a second switch output terminal; the first frequency source is electrically connected to the first switch input terminal, the second frequency source is electrically connected to the second switch input terminal, the first switch output terminal is electrically connected to the first local oscillator power input terminal, and the second switch output terminal is electrically connected to the second local oscillator power input terminal.

[0048] It should be noted that: in this embodiment, the radio frequency reconstruction of N sum channel basic units and N difference channel basic units is achieved through the radio frequency switch inside the receiver; the consistency of channel phase is ensured in the two states through the power divider inside the receiver; and the full switching and multiplexing of the local oscillator signals generated by the two frequency sources is ensured through the matrix switch inside the frequency synthesizer.

[0049] The working principle of a multiplexed multichannel receiver system is as follows: Figure 1 As shown, the system consists of a channel receiver, a first local oscillator power divider network, a second local oscillator power divider network, and a frequency synthesizer. The channel receiver includes N sum channel basic units and N difference channel basic units, and processes a total of 2×N signals. Figure 1 Only one basic unit for the sum channel and one basic unit for the difference channel are shown; the other units are identical to these.

[0050] like Figure 1 As shown, the matrix switch includes a third power divider, a fourth power divider, a third switch, and a fourth switch; wherein,

[0051] The third power divider is a 1-to-2 power divider, and the third switch is a dual-ended selection switch, including selection of terminal b, selection of terminal c, and output of terminal a;

[0052] The fourth power divider is a 1-to-2 power divider, and the fourth switch is a two-terminal selection switch, including selection terminal e, selection terminal f and output terminal d;

[0053] The input terminal of the third power divider is electrically connected to the input terminal of the first switch, and its output terminal is electrically connected to the selection terminal b and the selection terminal e, respectively. The input terminal of the fourth power divider is electrically connected to the input terminal of the second switch, and its output terminal is electrically connected to the selection terminal c and the selection terminal f, respectively. Its output terminal a is electrically connected to the output terminal of the first switch, and its output terminal d is electrically connected to the output terminal of the second switch.

[0054] The sum and difference channel basic units implement low-noise amplification, down-conversion, and analog-to-digital conversion of two echo signals. Each channel consists of a low-noise amplifier, a power divider, a switch, a mixer component, and an AD converter. Among them, the low-noise amplifier is the preamplifier of the channel receiver, ensuring the low-noise performance of the receiver; the second power divider realizes equal-amplitude multiplexing of the sum beam signal, and the first power divider is used to compensate for the phase of the second power divider; the first switch realizes the selection of the sum and difference beams, and the second switch is used to compensate for the phase of the first switch.

[0055] The first load is used to match the redundant ports of the first power divider, and the second load is used to match the redundant ports of the second switch; both the first and second mixing components consist of a mixer, a filter, and an amplifier, to realize the down-conversion of the high-frequency echo to the intermediate frequency echo, to filter the intermodulation spurious generated by the frequency conversion, and to amplify the power of the intermediate frequency signal; the AD converter converts the analog signal into a digital signal.

[0056] Both the first and second local oscillator power amplifier networks are composed of multiple cascaded one-to-two power dividers, which distribute the local oscillator signal generated by the frequency synthesizer into N channels.

[0057] The frequency synthesizer consists of a signal generator and a matrix switch. The first and second frequency sources are both direct synthesis frequency sources based on DDS technology, generating a first local oscillator signal and a second local oscillator signal. The matrix switch implements full switching functionality through a power divider and switches; the power divider is used for signal multiplexing, and the switches are used for signal selection. The first and second frequency sources generate two local oscillator signals of different frequencies. Through four logic relationships of the matrix switch, the first and second local oscillator signals can be composed of four different frequencies.

[0058] like Figure 2 As shown, when operating in single-pulse mode,

[0059] The selection terminal A of the first switch for selecting the basic unit of each difference channel of the channel receiver, and the selection terminal D of the second switch for selecting the basic unit of each sum channel of the channel receiver;

[0060] The matrix switch of the frequency synthesizer selects the b terminal of the third switch and outputs the first local oscillator signal to the first local oscillator power divider network;

[0061] The matrix switch of the frequency synthesizer selects the e terminal of the fourth switch and outputs the second local oscillator signal to the second local oscillator power divider network.

[0062] It should be noted that when the channel receiver receives the TTL logic level controlled by the switch, if it is the level corresponding to a single-pulse system, the first and second switches automatically switch to the corresponding states. The first switch selects AC, and the second switch selects DF. At this time, the difference beam signal and the beam signal enter the two channels respectively for down-conversion and AD conversion processing, and the two channels are isolated by the first switch.

[0063] The frequency synthesizer receives the same switch control, and the first and second switches automatically switch to their corresponding states. The third switch selects ab, and the fourth switch selects de, shutting down the second frequency source. The third power divider, the first local oscillator power amplifier network, and the second local oscillator power amplifier network constitute a 1-to-2×N signal distribution circuit, distributing the local oscillator signal generated by the first frequency source to the 2×N channels of the channel receiver.

[0064] like Figure 3 As shown, when operating in dual-frequency mode,

[0065] The selection terminal B of the first switch for selecting the basic unit of each difference channel of the channel receiver, and the selection terminal D of the second switch for selecting the basic unit of each sum channel of the channel receiver;

[0066] The matrix switch of the frequency synthesizer selects the b terminal of the third switch and outputs the first local oscillator signal to the first local oscillator power divider network;

[0067] The matrix switch of the frequency synthesizer selects the f terminal of the fourth switch and outputs the second local oscillator signal to the second local oscillator power divider network.

[0068] It should be noted that when the channel receiver receives the TTL logic level of the switch control, if it is the level corresponding to a dual-frequency system, the first and second switches automatically switch to the corresponding states. Switch one selects BC, and switch two selects DF. At this time, the differential beam signal is turned off, and the two beam signals split by the second power divider enter two mixing components respectively. In the mixing components, they are down-converted with the first and second local oscillator signals of different frequencies, and then undergo AD conversion.

[0069] The frequency synthesizer receives the same switch control, and the first and second switches automatically switch to their corresponding states. The third switch selects ab, the fourth switch selects df, and ports c and e are disconnected. At this time, the first local oscillator signal generated by the first frequency source is distributed to the first mixer components of N channels of the channel receiver by the first local oscillator power amplifier network after passing through the third power divider and the third switch; the second local oscillator signal generated by the second frequency source is distributed to the second mixer components of N channels of the channel receiver by the first local oscillator power amplifier network after passing through the fourth power divider and the fourth switch. The two local oscillator signals are isolated from each other and have different frequencies.

[0070] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A multiplexed multichannel receiving system, characterized by The channel receiver, the first local oscillator power division network, the second local oscillator power division network and the frequency synthesizer are included. The channel receiver includes N sum wave channel basic units and N difference wave channel basic units. The difference wave channel basic unit includes a first low noise amplifier, a first power divider, a first switch, a first mixing component and a first AD converter. The first low noise amplifier receives a difference wave beam signal at its input end and is electrically connected to the input end of the first power divider through its output end. The first power divider is a one-to-two power divider, and the first switch is a double-ended selection switch including a selection A end, a selection B end and an output C end. The first power divider is electrically connected to the selection A end, and the first AD converter, the first mixing component and the output C end are electrically connected in series. The second low noise amplifier receives a sum wave beam signal at its input end and is electrically connected to the input end of the second power divider through its output end. The second power divider is a one-to-two power divider, and the second switch is a double-ended selection switch including a selection D end, a selection E end and an output F end.

2. A multiplexed multichannel receiving system as claimed in claim 1, characterized in that The second power divider is electrically connected to the selection B end and the selection D end, and the second AD converter, the second mixing component and the output F end are electrically connected in series. The first local oscillator power division network includes a first local oscillator power division input end and N local oscillator power division output ends. The second local oscillator power division network includes a second local oscillator power division input end and N local oscillator power division output ends. The frequency synthesizer includes a first frequency source, a second frequency source and a matrix switch.

3. A multiplexed multichannel receiving system as claimed in claim 2, characterized in that The matrix switch includes a first switch input end, a second switch input end, a first switch output end and a second switch output end. The first frequency source is electrically connected to the first switch input end, the second frequency source is electrically connected to the second switch input end, the first switch output end is electrically connected to the first local oscillator power division input end, and the second switch output end is electrically connected to the second local oscillator power division input end. The third power divider is a one-to-two power divider, and the third switch is a double-ended selection switch including a selection b end, a selection c end and an output a end. The fourth power divider is a one-to-two power divider, and the fourth switch is a double-ended selection switch including a selection e end, a selection f end and an output d end. The input end of the third power divider is electrically connected to the first switch input end, and the output end is electrically connected to the selection b end and the selection e end. The input end of the fourth power divider is electrically connected to the second switch input end, and the output end is electrically connected to the selection c end and the selection f end. The output a end is electrically connected to the first switch output end, and the output d end is electrically connected to the second switch output end. When working in a single pulse mode, The difference wave channel basic unit of the channel receiver selects the selection A end of the first switch, and the sum wave channel basic unit of the channel receiver selects the selection D end of the second switch; The matrix switch of the frequency synthesizer selects the selection b end of the third switch, and outputs the first local oscillator signal to the first local oscillator power division network; The matrix switch of the frequency synthesizer selects the selection e end of the fourth switch, and outputs the second local oscillator signal to the second local oscillator power division network.

4. A multiplexed multichannel receiving system according to claim 2, wherein, When working in the dual frequency mode, The difference wave channel basic unit of the channel receiver selects the selection B end of the first switch, and the sum wave channel basic unit of the channel receiver selects the selection D end of the second switch; The matrix switch of the frequency synthesizer selects the selection b end of the third switch, and outputs the first local oscillator signal to the first local oscillator power division network; The matrix switch of the frequency synthesizer selects the selection f end of the fourth switch, and outputs the second local oscillator signal to the second local oscillator power division network.

5. A multiplexed multichannel receiving system according to claim 1, characterized in that The difference wave channel basic unit is further provided with a first load; wherein the output end of the first power divider is electrically connected with the first load and the selection A end respectively.

6. A multiplexed multichannel receiving system according to claim 1, characterized in that The sum wave channel basic unit is further provided with a second load; wherein the second load is electrically connected with the selection E end.

7. A multiplexed multichannel receiving system according to claim 1, wherein, The first mixing component and the second mixing component adopt the same mixing component structure, which comprises a mixer, a filter and an amplifier connected in series.

8. A multiplexed multichannel receiving system according to claim 1, characterized in that The first frequency source and the second frequency source are both direct synthesis frequency sources based on the DDS technology.

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