CN109462416B - Intermediate frequency receiver based on single-channel target information extraction - Google Patents
Intermediate frequency receiver based on single-channel target information extraction Download PDFInfo
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- CN109462416B CN109462416B CN201811562496.6A CN201811562496A CN109462416B CN 109462416 B CN109462416 B CN 109462416B CN 201811562496 A CN201811562496 A CN 201811562496A CN 109462416 B CN109462416 B CN 109462416B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
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Abstract
The invention provides an intermediate frequency receiver based on single-channel target information extraction, which comprises a channel merging front stage and a channel separation rear stage; the input end of the channel merging front stage is connected with the sum-difference network to receive three paths of signals, and the channel merging front stage is also connected with a fuse echo signal of a fuse antenna; the channel merging front stage merges a plurality of signal inputs into a signal output through a channel selection switch, and the channel separation rear stage separates a signal input into a plurality of signal outputs through the channel selection switch; and a multistage amplifying circuit and a frequency mixing circuit are connected between the channel merging front stage and the channel separation rear stage. The invention reduces the difficulty of debugging and calibration due to the combination and reduction of the number of channels, and is easy to realize the consistency of the channels in the full temperature range of the receiver; and devices of a channel merging part are reduced, so that the product cost is reduced, and the product volume is reduced.
Description
Technical Field
The invention relates to an intermediate frequency receiver based on single-channel target information extraction.
Background
As shown in fig. 4, the conventional receiver has a complex design process and a relatively high design difficulty; because the phases and gains of the three receiving channels are required to be consistent, higher requirements are provided for the consistency of the layout and routing of the device and the circuit, the debugging and calibration difficulty is increased, and the cost is increased; even if the traditional radar seeker and the difference channel receiver are debugged and calibrated, due to the fact that the devices are affected by temperature and are inconsistent, the consistency of the traditional radar seeker and the difference channel receiver in the full-temperature range is difficult to guarantee, and the error of the target spatial angle position is increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides the intermediate frequency receiver based on the single-channel target information extraction, and the intermediate frequency receiver based on the single-channel target information extraction reduces the debugging and calibration difficulty due to the combination and reduction of the number of channels, and is easy to realize the channel consistency in the full temperature range of the receiver.
The invention is realized by the following technical scheme.
The invention provides an intermediate frequency receiver based on single-channel target information extraction, which comprises a channel merging front stage and a channel separation rear stage; the input end of the channel merging front stage is connected with the sum-difference network to receive three paths of signals, and the channel merging front stage is also connected with a fuse echo signal of a fuse antenna; the channel merging front stage merges a plurality of signal inputs into a signal output through a channel selection switch, and the channel separation rear stage separates a signal input into a plurality of signal outputs through the channel selection switch; and a multistage amplifying circuit and a frequency mixing circuit are connected between the channel merging front stage and the channel separation rear stage.
The three signals received by the channel merging preceding stage input stage are respectively a azimuth difference signal, a pitch difference signal and a sum signal.
The channel separation rear stage is realized by adopting an SP2T switch and an SP3T switch, wherein the SP2T switch is used for separating a fuse echo signal, and the SP3T switch is used for separating three signals.
And the post-stage circuit of the channel selection switch of the post-stage of the channel separation is also connected with a filter circuit and an amplifying circuit.
When the channel merging front stage inputs and merges multiple paths of signals, the channel merging front stage uses a time sequence signal as a control signal of a channel selection switch in a channel separation rear stage to complete the input and merging of the multiple paths of signals.
The mixing circuit between the channel merging front stage and the channel separation rear stage is at least two stages.
The frequency of the input signal of the channel separation later stage is not higher than 200 MHz.
The SP2T switch in the post stage of the channel separation precedes an amplifying circuit and a mixing circuit.
The invention has the beneficial effects that: due to the combination and reduction of the number of the channels, the debugging and calibration difficulty is reduced, and the consistency of the channels in the full temperature range of the receiver is easy to realize; and devices of a channel merging part are reduced, so that the product cost is reduced, and the product volume is reduced.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic connection diagram of a first embodiment of a later stage of the channel separation of FIG. 1;
FIG. 3 is a schematic diagram of the connection of a second embodiment of the latter stage of the channel separation of FIG. 1;
fig. 4 is a schematic diagram of the prior art.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, the intermediate frequency receiver based on single-channel target information extraction includes a channel merging preceding stage and a channel separation subsequent stage; the input end of the channel merging front stage is connected with the sum-difference network to receive three paths of signals, and the channel merging front stage is also connected with a fuse echo signal of a fuse antenna; the channel merging front stage merges a plurality of signal inputs into a signal output through a channel selection switch, and the channel separation rear stage separates a signal input into a plurality of signal outputs through the channel selection switch; and a multistage amplifying circuit and a frequency mixing circuit are connected between the channel merging front stage and the channel separation rear stage.
The three signals received by the channel merging preceding stage input stage are respectively a azimuth difference signal, a pitch difference signal and a sum signal.
The channel separation rear stage is realized by adopting an SP2T switch and an SP3T switch, wherein the SP2T switch is used for separating a fuse echo signal, and the SP3T switch is used for separating three signals.
And the post-stage circuit of the channel selection switch of the post-stage of the channel separation is also connected with a filter circuit and an amplifying circuit.
When the channel merging front stage inputs and merges multiple paths of signals, the channel merging front stage uses a time sequence signal as a control signal of a channel selection switch in a channel separation rear stage to complete the input and merging of the multiple paths of signals.
The mixing circuit between the channel merging front stage and the channel separation rear stage is at least two stages.
Example 1
As shown in fig. 2, the pre-stage amplifier circuit is composed of a 1-bit 32dB digitally controlled attenuator (insertion loss L is-1 dB), an amplifier (gain G is 26dB, noise factor NF is 1.5dB, and 1dB compression point P-1 is 15dBm), a filter (insertion loss L is-1 dB), a 1-bit 20dB digitally controlled attenuator, and an amplifier (gain G is 15dB, noise factor NF is 2.4dB, and 1dB compression point P-1 is 16dBm) from left to right according to the signal flow. Wherein, the 1-bit 32dB digital control attenuator and the 1-bit 20dB digital control attenuator are not attenuated when weak input signals are provided, and the attenuation is started step by step along with the increase of the intensity of the input signals, thereby ensuring the dynamic range of the whole channel. The cascade number of the amplifiers and the filters included in the pre-stage amplifying circuit can be increased or decreased according to the use requirement.
The mixer circuit is a single mixer (mixing loss L-8 dB, P-1-15 dBm), and downconverts the input L-band signal to 150 MHz. The frequency of the mixed signal can be changed according to the system requirement, and the performance of an A/D sampling device in the back-end signal processor is not higher than 200 MHz.
The post-stage amplification circuit comprises a filter (insertion loss L is-1 dB), a temperature compensation attenuator (insertion loss L is-3 dB), an amplifier (gain G is 31dB, noise coefficient NF is 2.2dB, 1dB compression point P-1 is 12.5dBm), a filter (insertion loss L is-1 dB), a 31dB numerical control attenuator (insertion loss L is-1.5 dB, and the attenuation is adjustable within the range of 0-31 dB), an amplifier (gain G is 22dB, noise coefficient NF is 2.7dB, 1dB compression point P-1 is 12.5dBm), a temperature compensation attenuator (insertion loss L is-3 dB), and an amplifier (gain G is 22dB, noise coefficient NF is 2.7dB, and 1dB compression point P-1 is 12.5dBm) from left to right according to the signal flow direction. Under the control of the signal processor, the 31dB numerical control attenuator does not attenuate when weak signals are generated, gradually increases the attenuation when strong signals are generated, and ensures that the attenuation of the whole channel is adjustable by matching with two stages of fixed attenuators in the pre-stage amplifying circuit, and the adjustment range is larger than 80 dB.
The post-stage circuit with separated channels is switched from left to right and from top to bottom by an SP2T switch (insertion loss L-1.5 dB, isolation ISO-60 dB), a filter (insertion loss L-3 dB), a coupler (insertion loss L-1 dB, coupling degree 17dB), an SP3T switch (insertion loss L-0.5 dB, isolation ISO-40 dB), an SP2T switch (insertion loss L-1.5 dB, isolation ISO-60 dB), a narrow band filter (insertion loss L-8.5 dB), a wide band filter (insertion loss L-3 dB), an SP2T switch (insertion loss L-1.5 dB, isolation ISO-60 dB), an SP2T switch (insertion loss L-1.5 dB, isolation ISO-60 dB), a narrow band filter (insertion loss L-8.5 dB), and an insertion loss L-3 dB), respectively An SP2T switch (insertion loss L-1.5 dB, isolation ISO-60 dB), an SP2T switch (insertion loss L-1.5 dB, isolation ISO-60 dB), a narrow band filter (insertion loss L-8.5 dB), a broadband filter (insertion loss L-3 dB), an SP2T switch (insertion loss L-1.5 dB, isolation ISO-60 dB), an amplifier detector, and a level shifter.
The circuit of the embodiment maximally shares the devices, thereby greatly reducing the number of the devices in the receiver, lowering the product cost and reducing the product volume. However, since the device sharing the channel portion needs to satisfy the requirements of two operation modes (fuse mode and guidance mode) at the same time, attention is required in device selection.
Example 2
As shown in fig. 3, the fuze channel and sum-difference signal are separated before the mixer circuit, otherwise, as with embodiment 1, it can be seen that embodiment 2 adds the mixer circuit and the post-stage amplifier circuit after the fuze channel separation compared with embodiment 1, and the extra mixer circuit and the post-stage amplifier circuit are basically the same as embodiment 1, and only needs to properly adjust the stages of the amplifier and the filter as required.
The advantage of embodiment 2 is that the consideration of device type selection can be reduced, and at this time, the frequency after frequency mixing and the device operating frequency band of the post-stage amplifying circuit can be changed according to the actual use requirement by the separated fuse channel, so as to reduce the design difficulty. The disadvantages are as follows: the device is often used, and is inferior to embodiment 1 in cost and volume.
Claims (8)
1. The utility model provides an intermediate frequency receiver based on single channel target information draws, includes passageway amalgamation preceding stage and passageway separation poststage, its characterized in that: the input end of the channel merging front stage is connected with the sum-difference network to receive three paths of signals, and the channel merging front stage is also connected with a fuse echo signal of a fuse antenna; the channel merging front stage merges a plurality of signal inputs into a signal output through a channel selection switch, and the channel separation rear stage separates a signal input into a plurality of signal outputs through the channel selection switch; the multi-stage amplification circuit and the frequency mixing circuit are connected between the channel merging front stage and the channel separation rear stage, the multi-stage amplification circuit comprises a front stage amplification circuit and a rear stage amplification circuit, the front stage amplification circuit consists of a 1-bit 32dB numerical control attenuator, an amplifier, a filter, a 1-bit 20dB numerical control attenuator and an amplifier from left to right according to the signal flow direction, and the rear stage amplification circuit consists of a filter, a temperature compensation attenuator, an amplifier, a filter, a numerical control attenuator, an amplifier, a temperature compensation attenuator and an amplifier from left to right according to the signal flow direction;
the 1-bit 32dB digital control attenuator and the 1-bit 20dB digital control attenuator are not attenuated when weak input signals are provided, the attenuation is started step by step along with the increase of the intensity of the input signals, the dynamic range of the whole channel is ensured, and the cascade number of amplifiers and filters contained in the preceding stage amplifying circuit can be increased or decreased along with the use requirement;
two paths of temperature compensation attenuators in the post-stage amplifying circuit guarantee the consistency of signals and the difference receiver in the whole temperature range, and the numerical control attenuator does not attenuate when the signals are weak and gradually increases the attenuation when the signals are strong under the control of the signal processor, and the two fixed attenuators in the pre-stage amplifying circuit are matched to guarantee that the attenuation of the whole channel is adjustable.
2. The intermediate frequency receiver based on single channel target information extraction as claimed in claim 1, characterized in that: the three signals received by the channel merging preceding stage input stage are respectively a azimuth difference signal, a pitch difference signal and a sum signal.
3. The intermediate frequency receiver based on single channel target information extraction as claimed in claim 1, characterized in that: the channel separation rear stage is realized by adopting an SP2T switch and an SP3T switch, wherein the SP2T switch is used for separating a fuse echo signal, and the SP3T switch is used for separating three signals.
4. The intermediate frequency receiver based on single channel target information extraction as claimed in claim 1, characterized in that: and the post-stage circuit of the channel selection switch of the post-stage of the channel separation is also connected with a filter circuit and an amplifying circuit.
5. The intermediate frequency receiver based on single channel target information extraction as claimed in claim 1, characterized in that: when the channel merging front stage inputs and merges multiple paths of signals, the channel merging front stage uses a time sequence signal as a control signal of a channel selection switch in a channel separation rear stage to complete the input and merging of the multiple paths of signals.
6. The intermediate frequency receiver based on single channel target information extraction as claimed in claim 1, characterized in that: the mixing circuit between the channel merging front stage and the channel separation rear stage is at least two stages.
7. The intermediate frequency receiver based on single channel target information extraction as claimed in claim 1, characterized in that: the frequency of the input signal of the channel separation later stage is not higher than 200 MHz.
8. The intermediate frequency receiver based on single channel target information extraction as claimed in claim 3, characterized in that: the SP2T switch in the post stage of the channel separation precedes an amplifying circuit and a mixing circuit.
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Effective date of registration: 20230106 Address after: 550009 No.7 Honghe Road, economic and Technological Development Zone, Guiyang City, Guizhou Province Patentee after: Aerospace Jiangnan Group Co.,Ltd. Patentee after: GUIZHOU AEROSPACE ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 550009, Honghe Road, Xiaohe District, Guizhou, Guiyang 7 Patentee before: GUIZHOU AEROSPACE ELECTRONIC TECHNOLOGY Co.,Ltd. |
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