Multi-channel multi-band universal intermediate frequency receiving and processing device

Abstract

The invention discloses a multi-channel multi-band universal intermediate frequency receiving and processing device, which relates to the field of communication and comprises a switch, a splitter, a variable gain amplifier, a temperature compensation attenuator, an amplifier, a filter, a frequency synthesizer, a frequency mixer, a numerical control attenuator, an FPGA (field programmable gate array) processor and the like. The system has the advantages of miniaturization, low power consumption, low cost, high jump speed, multiple channels, multiple frequency bands, full localization, high environment adaptability and the like, and can meet the application requirements of various working scenes such as a fixed station, a vehicle-mounted station, an airborne station, a portable station and the like. Rapid frequency hopping, multiple frequency bands, multiple channels and 100% localization are the key of the invention. Through the multi-channel and multi-frequency-band design, a plurality of independent receiving channels can be realized, a plurality of intermediate frequency working frequency bands such as 70MHz, 140MHz and extended L frequency bands are supported at the same time, and the universality and the integration degree of the intermediate frequency receiving channels are remarkably improved.

Description

Technical Field

[0001] The present invention relates to a multi-channel, multi-band universal intermediate frequency receiving and processing technology in the communication field, supports multiple satellite communication working frequency bands such as 70MHz, 140MHz, and extended L-band, and can process up to three independent intermediate frequency receiving signals at the same time. It has the characteristics of miniaturization, low cost, high integration, and national production, and is particularly suitable for receiving intermediate frequencies as multi-channel universal satellite communication terminal equipment. Background Art

[0002] As the total number of satellite communication channel devices increases day by day, space resources are becoming increasingly scarce, which seriously affects the communication quality of existing satellite communication equipment. In order to cope with the increasingly severe space environment and improve the communication quality of satellite communication systems, satellite communication channel equipment needs to support multiple working frequency bands and have strong frequency hopping capabilities. In addition, as the requirements for satellite communication channel equipment become higher and higher in terms of integration, in addition to supporting the expansion of working frequency bands from single frequency band to multiple frequency bands, a single device also has higher and higher requirements for the number of channels it supports.

[0003] At present, the multi-channel and multi-band modems used in domestic satellite communication systems are basically imported equipment and do not have the ability of fast frequency hopping. Imported equipment is not only costly, but also technically limited and cannot adapt to some harsh use environments, such as poor electromagnetic compatibility, poor shock and vibration resistance, and narrow temperature adaptability. These have brought a lot of inconvenience to users. At present, the receiving intermediate frequency units in satellite communication channel equipment cannot simultaneously meet the requirements of multi-channel, multi-band, fast frequency hopping and nationalization. Summary of the invention

[0004] The purpose of the present invention is to avoid the shortcomings of the above-mentioned background technology and provide a multi-channel and multi-band universal intermediate frequency receiving and processing device that can be used as a universal satellite communication channel device to receive the intermediate frequency. The present invention can operate in a relatively harsh environment (-40℃~+65℃), adopts a highly integrated and fully domestically produced design, and the size of each intermediate frequency processing device is only 150mm*70mm*15mm. It can realize three independent receiving channels, support multiple satellite communication working frequency bands such as 70MHz, 140MHz, and extended L band, support frequency hopping, and at the same time have the characteristics of simple control method, low power consumption, and fully domestic production.

[0005] The technical solution adopted by the present invention is:

[0006] A multi-channel multi-band universal intermediate frequency receiving and processing device, comprising a first switch 1, a fourth filter 16, a third amplifier 17, a first digitally controlled attenuator 18, a third variable incremental amplifier 19 and an FPGA processor 24 and a multi-stage multi-band universal intermediate frequency receiving channel;

[0007] The switching ports of the first switch are respectively connected to the input end of the multi-band universal intermediate frequency receiving channel and the fourth filter, and perform channel switching on the external input intermediate frequency signal, and transmit it to the extended L-band processing channel and 70M / 140M respectively;

[0008] The FPGA processor 24 is used to control the multi-band universal intermediate frequency receiving channel, the first digitally controlled attenuator 18, the third variable incremental amplifier 19 and the first switch 1;

[0009] The fourth filter 16 operates in the 70M / 140M frequency band, and is used to perform low-pass filtering on the input intermediate frequency signal and filter out out-band spurious signals; the third amplifier 17 amplifies the level of the filtered signal, and outputs the amplified intermediate frequency signal to the first digitally controlled attenuator 18; the first digitally controlled attenuator 18 performs controllable attenuation adjustment on the level of the intermediate frequency signal, and then outputs it to the third variable gain amplifier 19; the third variable gain amplifier 19 adjusts the level of the 70M / 140M intermediate frequency signal input from the front stage, so that the output level meets the use requirements of the post-stage AD processor.

[0010] Further, each level of the multi-band universal intermediate frequency receiving channel includes a first splitter 2, a first variable gain amplifier 4, a first temperature compensated attenuator 5, a first amplifier 6, a first mixer 7, a first frequency synthesizer 8, a first filter 9, a second mixer 10, a second frequency synthesizer 11, a second amplifier 12, a second filter 13, a second variable gain amplifier 14, a third filter 15, a third splitter 20, a second switch 22, and a fourth amplifier 23;

[0011] The first splitter 2 operates in the extended L frequency band and is used to split the intermediate frequency signal, one of which is used for the next-level multi-band universal intermediate frequency receiving channel; the other branch is input to the first variable gain amplifier 4, the first variable gain amplifier 4 adjusts the level of the split signal, and the level-adjusted signal is output to the temperature-compensated attenuator 5; the temperature-compensated attenuator 5 performs temperature compensation on the gain of the intermediate frequency link; the first amplifier 6 amplifies the level of the temperature-compensated signal, and outputs the amplified intermediate frequency signal to the first mixer 7; the first mixer 7 mixes the amplified intermediate frequency signal with the local oscillator generated by the first frequency synthesizer 8 to generate an intermediate frequency signal with a fixed frequency in the X frequency band, and outputs it to the first filter 9; the first filter 9 performs band-pass filtering on the intermediate frequency signal with a fixed frequency, filters out the out-of-band spurious signal, and outputs it to The second mixer 10; the second mixer 10 mixes the filtered intermediate frequency fixed frequency signal with the local oscillator generated by the second frequency synthesizer 11 to generate an intermediate frequency signal with a fixed frequency in the S band, and outputs it to the second amplifier 12; the second amplifier 12 amplifies the level of the signal after the second mixing, and outputs the amplified signal to the second filter 13; the second filter 13 performs low-pass filtering on the intermediate frequency signal with a fixed frequency in the S band, filters out the out-of-band spurious signals, and outputs it to the second variable gain amplifier 14; the second variable gain amplifier 14 adjusts the level of the filtered low intermediate frequency signal so that the output level meets the use requirements of the post-stage AD processor; the third filter 15 performs band-pass filtering on the intermediate frequency signal with a fixed frequency in the S band, filters out the out-of-band spurious signals, and outputs it to the second switch 22;

[0012] The output end of the third variable gain amplifier 19 is connected to the second switch 22 through the third splitter 20; the second switch 22 is used to switch and select the 70M / 140M intermediate frequency signal and the S-band fixed frequency intermediate frequency signal, and output it to the fourth amplifier 23 after selection; the fourth amplifier 23 amplifies the intermediate frequency signal after the switch selection, and finally outputs it for processing by the subsequent AD;

[0013] The FPGA processor 24 is used to control the first variable gain amplifier 4 , the first frequency synthesizer 8 , the second frequency synthesizer 11 , the second variable gain amplifier 14 , and the second switch 22 .

[0014] Furthermore, the extended L-band processing channel and 70M / 140M of the multi-band universal intermediate frequency receiving channel of the next stage are respectively obtained by branching from the first brancher and the third brancher of the previous stage.

[0015] Compared with the background technology, the present invention has the following advantages:

[0016] 1. The present invention can support multiple frequency bands such as 70MHz, 140MHz and extended L band, and achieve multi-band compatibility.

[0017] 2. The present invention has a high integration level and integrates three completely independent intermediate frequency receiving channels. The size of the three-channel product is only 150mm*70mm*15mm.

[0018] 3. The present invention supports frequency hopping, with a maximum frequency hopping speed of 5000 hops / second.

[0019] 4. The present invention is completely independent and controllable, and the selected components are 100% localized.

[0020] 5. The invention has good environmental applicability and can be used in harsh environmental temperatures (-40°C ~

[0021] +65℃) can work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a principle block diagram of the multi-channel and multi-band universal intermediate frequency receiving and processing device of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Reference Figure 1 The present invention provides a multi-channel multi-band universal intermediate frequency receiving and processing device, comprising a first switch 1, a first splitter 3 at the next stage, a third splitter 21 at the next stage, an FPGA processor 24, a fourth filter 16, a third amplifier 17, a first digitally controlled attenuator 18, a third variable gain amplifier 19 and a plurality of multi-band universal intermediate frequency receiving channels.

[0025] Each multi-band universal intermediate frequency receiving channel is composed of a first splitter 2, a first variable gain amplifier 4, a first temperature compensated attenuator 5, a first amplifier 6, a first mixer 7, a first frequency synthesizer 8, a first filter 9, a second mixer 10, a second frequency synthesizer 11, a second amplifier 12, a second filter 13, a second variable gain amplifier 14, a third filter 15, a third splitter 20, a second switch 22, and a fourth amplifier 23. In this embodiment, the next-stage first splitter 3 and the next-stage third splitter 21 are part of the second-stage multi-frequency end universal intermediate frequency receiving channel.

[0026] Figure 1 is an electrical principle block diagram of an embodiment of the present invention, and the embodiment is as follows Figure 1Connection line. The first switch 1 can switch the channel of the external input intermediate frequency signal and transmit it to the processing channel of 70M / 140M or extended L frequency band respectively. The first switch 1 of the embodiment adopts the commercially available dedicated switch SIS252SP3; the first splitter 2 and the next-level first splitter 3 work in the extended L frequency band and are used to split the intermediate frequency signal for use by multiple multi-band universal intermediate frequency receiving channels. The first splitter 2 and the next-level first splitter 3 of the embodiment adopt the commercially available dedicated splitter GR1210; the first variable gain amplifier 4 adjusts the level of the split signal. The first variable gain amplifier 4 of the embodiment adopts the commercially available dedicated variable gain amplifier BR9603; temperature compensated attenuator 5 performs temperature compensation on the gain of the intermediate frequency link. The temperature-compensated attenuator 5 of the embodiment adopts the commercially available dedicated temperature-compensated attenuator HTCA1803N9W3; the first amplifier 6 amplifies the level of the temperature-compensated signal. The first amplifier 6 of the embodiment adopts the commercially available dedicated amplifier ZDH9019; the first mixer 7 mixes the amplified intermediate frequency signal with the broadband local oscillator signal generated by the first frequency synthesizer 8 to generate an intermediate frequency signal with a fixed frequency in the X-band. The first mixer 7 of the embodiment adopts the commercially available dedicated mixer YMC8002-Q1P; the first frequency synthesizer 8 generates an X-band local oscillator signal. The first frequency synthesizer 8 of the embodiment adopts the commercially available dedicated frequency synthesizer CAPV0728 C32; the first filter 9 performs bandpass filtering on the intermediate frequency signal of fixed frequency to filter out the out-of-band spurious signals. The first filter 9 of the embodiment adopts a commercially available customized dielectric filter; the second mixer 10 mixes the filtered intermediate frequency fixed frequency signal with the fixed frequency local oscillator generated by the second frequency synthesizer 11 to generate an intermediate frequency signal of fixed frequency in the S band. The second mixer 10 of the embodiment adopts a commercially available dedicated mixer YMC8002-Q1P. The second frequency synthesizer 11 of the embodiment adopts a commercially available dedicated frequency synthesizer CAPV0728C32; the second amplifier 12 amplifies the level of the signal after the second mixing. The second amplifier 12 of the embodiment adopts a commercially available dedicated amplifier The device ZDH9019; the second filter 13 performs low-pass filtering on the intermediate frequency signal of the S band fixed frequency. The second filter 13 of the embodiment adopts the commercially available dedicated filter XECLFCN3216-1000; the second variable gain amplifier 14 adjusts the level of the filtered low intermediate frequency signal so that the output level meets the use requirements of the post-stage AD processor. The second variable gain amplifier 14 of the embodiment adopts the commercially available dedicated variable gain amplifier YDC6401-QP4; the third filter 15 performs band-pass filtering on the intermediate frequency signal of the S band fixed frequency to filter out the out-of-band spurious signals. The third filter 15 of the embodiment adopts the commercially available dedicated LTCC band-pass filter;The fourth filter 16 operates in the 70M / 140M frequency band, and is used to perform low-pass filtering on the input intermediate frequency signal and filter out-of-band spurious signals. The fourth filter 16 of the embodiment adopts the commercially available dedicated LTCC filter XECLFCN3216-180; the third amplifier 17 amplifies the level of the filtered signal. The third amplifier 17 of the embodiment adopts the commercially available dedicated amplifier ZDH9019; the first digitally controlled attenuator 18 performs controllable attenuation adjustment on the level of the intermediate frequency signal. The first digitally controlled attenuator 18 of the embodiment adopts the commercially available dedicated digitally controlled attenuator SIAT082SP4; the third variable gain amplifier 19 adjusts the level of the 70M / 140M intermediate frequency signal input from the front stage so that the output level meets the use requirements of the post-stage AD processor. The third variable gain amplifier 19 of the embodiment adopts the commercially available dedicated variable gain amplifier YDC6401-QP4; the third splitter 20 and the next-stage third splitter 21 operate at 70M / 140M frequency band, used to split the processed intermediate frequency signal for use by multiple AD processors at the subsequent stage. The third splitter 20 and the third splitter 21 of the embodiment adopt the commercially available dedicated splitter SPD-2-10+; the switch 22 is used to switch and select the 70M / 140M intermediate frequency signal and the L-band fixed frequency intermediate frequency signal. The switch 22 of the embodiment adopts the commercially available dedicated switch SIS252SP3; the fourth amplifier 23 amplifies the intermediate frequency signal after the switch selection. The fourth amplifier 23 of the embodiment adopts the commercially available dedicated amplifier ZDH9019; the FPGA processor 24 is used to control the first switch 1, the first variable gain amplifier 4, the first frequency synthesizer 8, the second frequency synthesizer 11, the second variable gain amplifier 14, the first digitally controlled attenuator 18, the third variable gain amplifier 19, and the second switch 22. The FPGA processor 24 of the embodiment adopts the commercially available dedicated FPGA chip EF2L45UG132B. ;

[0027] The working principle of the present invention is as follows: the input port of the first switch 1 is connected to the external intermediate frequency input signal of the input port A, and enters the processing channel of 70M / 140M or extended L band respectively after selection. When the first switch 1 selects the extended L band processing channel, the multi-band universal intermediate frequency receiving channel 1 obtains the required low intermediate frequency fixed intermediate frequency signal through the joint action of the first splitter 2, the first variable gain amplifier 4, the temperature compensated attenuator 5, the first amplifier 6, the first mixer 7, the first frequency synthesizer 8, the first filter 9, the second mixer 10, the second frequency synthesizer 11, the second amplifier 12, the second filter 13, the second variable gain amplifier 14, the third filter 15, the second switch 22, and the fourth amplifier 23, and outputs it to the output port B. When the first switch 1 selects the 70M / 140M processing channel, the multi-band universal intermediate frequency receiving channel 1 obtains the required low intermediate frequency fixed intermediate frequency signal through the joint action of the fourth filter 16, the third amplifier 17, the first digitally controlled attenuator 18, the third variable gain amplifier 19, the third splitter 20, the second switch 22, and the fourth amplifier 23, and outputs it to the output port B. The present invention is controlled by an internally integrated FPGA processor 24, and the first switch 1, the first variable gain amplifier 4, the first frequency synthesizer 8, the second frequency synthesizer 11, the second variable gain amplifier 14, the first digitally controlled attenuator 18, the third variable gain amplifier 19, the second switch 22, etc. are controlled by the internally integrated FPGA. The present invention adopts LVDS as an external interface, and transmits data with the external FPGA through port C according to the specified transmission protocol.

[0028] The installation structure of the present invention is as follows: Figure 1 All circuit components are double-sided mounted on two 8-layer printed boards with a length and width of 140mm*60mm, and the printed boards are installed in the shielding box body, and then the structure is sealed by the upper and lower cover plates. The input port A and the output port B are connected by two SMP cable holders, and the input port C is connected by a low-frequency socket with a spacing of 1.27mm, and the above is assembled into the present invention.

[0029] The use of this technical solution can realize a multi-channel and multi-band universal intermediate frequency receiving and processing device that can be used in various application scenarios such as fixed stations, vehicle-mounted stations, airborne stations, and portable stations. This invention can take into account the technical requirements of miniaturization, low power consumption, high hopping speed, low cost, multi-channel, and multi-band.

Claims

1. A multi-channel multi-band universal intermediate frequency receiving and processing device, comprising a first switch (1), a fourth filter (16), a third amplifier (17), a first digitally controlled attenuator (18), a third variable increment amplifier (19), an FPGA processor (24), and a multi-stage multi-band universal intermediate frequency receiving channel; The switching ports of the first switch are respectively connected to the input end of the multi-band universal intermediate frequency receiving channel and the fourth filter, and perform channel switching on the external input intermediate frequency signal, and transmit it to the extended L-band processing channel and 70M / 140M respectively; The FPGA processor (24) is used to realize the control of the multi-band universal intermediate frequency receiving channel, the first digitally controlled attenuator (18), the third variable incremental amplifier (19) and the first switch (1); The fourth filter (16) operates in the 70M / 140M frequency band and is used for low-pass filtering the input intermediate frequency signal and filtering out-of-band spurious signals; the third amplifier (17) amplifies the level of the filtered signal and outputs the amplified intermediate frequency signal to the first digitally controlled attenuator (18); the first digitally controlled attenuator (18) performs controllable attenuation adjustment on the level of the intermediate frequency signal and outputs it to the third variable gain amplifier (19); the third variable gain amplifier (19) adjusts the level of the 70M / 140M intermediate frequency signal input from the front stage so that the output level meets the use requirements of the back-stage AD processor.

2. The multi-channel multi-band universal intermediate frequency receiving and processing device according to claim 1, characterized in that: Each stage of the multi-band universal intermediate frequency receiving channel comprises a first splitter (2), a first variable gain amplifier (4), a first temperature compensated attenuator (5), a first amplifier (6), a first mixer (7), a first frequency synthesizer (8), a first filter (9), a second mixer (10), a second frequency synthesizer (11), a second amplifier (12), a second filter (13), a second variable gain amplifier (14), a third filter (15), a third splitter (20), a second switch (22), and a fourth amplifier (23); The first splitter (2) operates in the extended L frequency band and is used to split the intermediate frequency signal, wherein one of the splits is used by the next-level multi-band universal intermediate frequency receiving channel; the other split is input to the first variable gain amplifier (4), the first variable gain amplifier (4) performs level adjustment on the split signal, and the level-adjusted signal is output to the temperature-compensated attenuator (5); the temperature-compensated attenuator (5) performs temperature compensation on the gain of the intermediate frequency link; the first amplifier (6) amplifies the level of the temperature-compensated signal and outputs the amplified intermediate frequency signal to the first mixer (7); the first mixer (7) mixes the amplified intermediate frequency signal with the local oscillator generated by the first frequency synthesizer (8) to generate an intermediate frequency signal with a fixed frequency in the X frequency band, and outputs it to the first filter (9); the first filter (9) performs bandpass filtering on the intermediate frequency signal with a fixed frequency, filters out out-of-band spurious signals, and outputs it to A second mixer (10); the second mixer (10) mixes the filtered intermediate frequency fixed frequency signal with the local oscillator generated by the second frequency synthesizer (11) to generate an intermediate frequency signal with an S-band fixed frequency, and outputs the signal to the second amplifier (12); the second amplifier (12) amplifies the level of the signal after the second mixing, and outputs the amplified signal to the second filter (13); the second filter (13) performs low-pass filtering on the intermediate frequency signal with an S-band fixed frequency, filters out out-of-band spurious signals, and outputs the signal to the second variable gain amplifier (14); the second variable gain amplifier (14) adjusts the level of the filtered low intermediate frequency signal so that the output level meets the use requirements of the post-stage AD processor; the third filter (15) performs band-pass filtering on the intermediate frequency signal with an S-band fixed frequency, filters out out-of-band spurious signals, and outputs the signal to the second switch (22); The output end of the third variable gain amplifier (19) is connected to the second switch (22) via the third splitter (20); the second switch (22) is used to switch and select the 70M / 140M intermediate frequency signal and the S-band fixed frequency intermediate frequency signal, and output them to the fourth amplifier (23) after selection; the fourth amplifier (23) amplifies the intermediate frequency signal after the switch selection, and finally outputs it for processing by the subsequent AD; The FPGA processor (24) is used to control the first variable gain amplifier (4), the first frequency synthesizer (8), the second frequency synthesizer (11), the second variable gain amplifier (14), and the second switch (22).

3. The multi-channel multi-band universal intermediate frequency receiving and processing device according to claim 2, characterized in that: The extended L-band processing channel and 70M / 140M of the multi-band universal intermediate frequency receiving channel of the next stage are respectively obtained by branching from the first brancher and the third brancher of the previous stage.

Images