Satellite communication terminal with integrated transceiver

Abstract

The utility model discloses a kind of through guide integration satellite communication terminal, and the first element for the first band noise filtering of the transmission signal amplified by PA is added between PA and transmitting antenna in the embodiment of the present disclosure, the generation of the in-band interference of reception frequency point is inhibited from source head;Second element for the first band rejection processing of the transmission signal received by receiving antenna to the transmission signal received by receiving antenna is added between receiving antenna and first LNA, avoid the large signal in transmission signal to push 1st LNA to saturation state, leading to the performance of entire receiving link sharp deterioration;To 1 or n levels of first LNA, the output end of several first LNA in it is connected with third or fourth element, the gain of effective signal frequency point and band rejection effect are improved;Through increasing first, second, third and fourth element, the communication navigation function of through guide integration satellite terminal does not interfere with each other, ensure the normal reception of downlink signal when communication transmission, solve the wireless self-interference problem of through guide integration satellite communication terminal.

Description

Technical Field

[0001] This utility model relates to satellite communication technology, and more specifically, to a satellite communication terminal integrating communication and navigation. Background Technology

[0002] With the development of satellite communication and satellite navigation technologies, realizing satellite navigation functions while conducting satellite communication has become an important development trend. This requires the design of an integrated communication and navigation system (hereinafter referred to as integrated communication and navigation). The integrated communication and navigation satellite communication terminal integrates satellite communication and satellite navigation positioning functions. At present, integrated communication and navigation mainly includes the following implementation methods: (1) Integrating the structure: mainly designing a suitable chassis structure and board size, encapsulating all boards of the communication transceiver and navigation receiver in the same structure, with the power distribution of the boards uniformly provided by the power distribution management unit, and designing a wideband antenna at the antenna end to receive communication and navigation signals simultaneously; in this type of equipment, the communication transceiver and navigation receiver are separate independent boards. Any form of loosely integrated communication and navigation equipment belongs to this category. (2) Digital processing integration: Integrating the functions of the communication transceiver and navigation receiver digital processing boards, the received communication signals and navigation signals are processed by the same signal processing board, and a unified external information interaction and control interface is provided; the Beidou-2 / 3 regional short message communication (RSMC) + satellite radio navigation service (RNSS) dual-model satellite terminal is a typical example of this design. The S-frequency signal broadcast by the Beidou GEO satellite realizes the regional short message communication function, and the B1C and other RNSS frequency signals broadcast by the Beidou GEO / IGSO / MEO satellite realize positioning and navigation. (3) Signal system integration: Mainly breaking through the traditional navigation signal form, designing a signal system that takes into account both communication and navigation functions. One approach is to incorporate communication messages into navigation messages, enabling the transmission of communication data within navigation signals. The BeiDou-3 Global Short Message Communication (GSMC) + RNSS dual-model satellite terminal is a typical example of this design. The B2b frequency signal broadcast by the BeiDou MEO satellite modulates navigation and communication messages through time-division multiplexing, achieving both positioning and navigation as well as short message communication.

[0003] In related technologies, communication transmission in integrated communication and navigation satellite communication terminals can interfere with downlink reception. Specifically, this means that while communication signals are being transmitted uplink, they interfere with the reception of navigation signals, leading to a deterioration in the navigation signal reception of the satellite communication terminal, and even problems such as positioning misses or inability to locate. Furthermore, the uplink transmission interferes with the downlink signal reception, causing a deterioration in the downlink signal reception during transmission, making it impossible to receive communication information normally. This interference between different functions within the same device is called "self-interference." Self-interference in integrated communication and navigation satellite receiving equipment includes radio self-interference and current self-interference. Radio self-interference refers to interference generated through the radio electromagnetic link; in integrated communication and navigation satellite receiving equipment, this manifests as the electromagnetic signals radiated by the transmitting antenna array being received by the receiving antenna array, entering the received signal band, or becoming interference harmonics through mixing, or raising the signal noise floor, thus deteriorating the signal reception.

[0004] From integrated structural design to integrated digital processing, and then to integrated signal systems, the integration of satellite communication and satellite navigation has become increasingly profound with the evolution of technology. Simultaneously, with the occupancy of limited electromagnetic spectrum resources and the increasing integration of satellite terminals, interference between the two has become increasingly acute. The following uses a BeiDou "short message + RNSS" dual-model device as an example to illustrate the mechanisms of these two types of self-interference in integrated communication and navigation satellite terminals: Figure 1 and Figure 2 This is a schematic diagram of a dual-model satellite terminal. Dual-model satellite terminals can be categorized based on whether the receiving and transmitting links are combined. Figure 1 The one-line type shown and Figure 2The two main categories shown are non-linear communication types. Aside from the difference between whether the receiving and transmitting links are combined, the receiving and transmitting processes of these two types of terminals are completely identical. The RSMC downlink signal (S), GSMC downlink signal (B2b), and RNSS signal are received by the receiving antenna and then amplified by a low-noise amplifier (LNA) before entering the RF chip's receiving channel. The RSMC and GSMC downlink signals (L-band) are output from the RF chip's transmitting channel, amplified by a power amplifier (PA), and then input to the transmitting antenna to radiate out as electromagnetic waves. The mechanism of wireless self-interference is as follows: the BeiDou short message communication function is implemented by the receiving and transmitting links; the receiving link operates continuously, constantly receiving downlink signals broadcast by the satellite; the transmitting link operates on pulses, and the transmission frequency does not exceed the service frequency provided by the system for the equipment. The receiving and transmitting links operate on different frequencies: ① The BeiDou RSMC downlink signal is at the S frequency (2491.75±8.16MHz), and the BeiDou RSMC uplink signal is at the L frequency (1610.0~1626.5MHz); ② The BeiDou GSMC downlink signal is at the B2b frequency (1207.14±10.23MHz), and the BeiDou GSMC uplink signal frequency Lf4 (1624.524±1.6376MHz) is also within the L frequency (1610.0~1626.5MHz). The RNSS signal frequencies closest to the aforementioned short message transmission frequencies include: ① BeiDou B1I, with a center frequency of 1561.098MHz and a bandwidth of 4.092MHz; ② BeiDou B1C, with a center frequency of 1575.42MHz and a bandwidth of 32.736MHz; ③ GPS L1CA, with a center frequency of 1575.42MHz and a bandwidth of 2MHz; ④ Galileo E1, with a center frequency of 1575.42MHz and a bandwidth of 9.66MHz. The BeiDou GEO satellite providing services to RSMC has an orbital altitude of 35,786 km, and the BeiDou MEO satellite providing services to GSMC has an orbital altitude of 21,528 km. To ensure normal communication, the transmission power of the short message uplink is generally above 5W. Considering practical application factors such as antenna elevation angle, it is usually designed to be 10W, which requires the use of a power amplifier (PA) to generate 10W of transmission power. When PA1-1 is operating, it generates broadband noise. If this broadband noise is not processed, it will be emitted through the transmitting antenna and enter the receiving link through the receiving antenna. Entering the operating frequency range of the receiving link, it raises the signal-to-noise ratio, reducing the carrier-to-noise ratio of the useful signal and affecting normal downlink signal reception. Signals within the operating frequency range output by the transmitting link will also be emitted through the transmitting antenna and enter the receiving link through the receiving antenna, forming harmonic interference. If the receiving link is not processed, this will also affect its normal operation. This high-power electromagnetic interference generated by short message transmission can last up to 1 second during RMSC transmission and up to 2 seconds during GMSC transmission, significantly impacting downlink signal reception.

[0005] Regarding the aforementioned wireless self-interference problem in integrated communication and navigation satellite terminals, relevant technologies have not yet provided an effective solution. How to solve the wireless self-interference problem in integrated communication and navigation satellite terminals has become an unresolved issue. Utility Model Content

[0006] This utility model embodiment provides an integrated satellite communication terminal including: a transmission link comprising a power amplifier PA1-1 and a transmitting antenna 1-2, a receiving link comprising a receiving antenna 2-1 and n levels of first low-noise amplifiers LNA2-2, and further comprising:

[0007] The first element 1-3, located between PA1-1 and transmitting antenna 1-2 in the transmission link, is configured to perform a first out-of-band suppression processing on the transmitted signal amplified by PA1-1. The power tolerance of the first element 1-3 is greater than the maximum power of the transmission channel located before PA1-1.

[0008] When n=1, it also includes a second element 2-3 and a third element 2-4. The second element 2-3 is located between the receiving antenna 2-1 of the receiving link and the first low-noise amplifier LNA2-2 of the first stage, and is configured to perform high-power suppression and second out-of-band suppression processing on the received signal received by the receiving antenna 2-1. The third element 2-4 is located after the first low-noise amplifier LNA2-2 of the first stage of the receiving link, and is configured to perform third out-of-band suppression processing on the received signal output by the first low-noise amplifier LNA2-2 of the corresponding stage.

[0009] When n > 1, it also includes i fourth elements 2-5, i is less than or equal to n, n levels of first low noise amplifiers LNA are connected in series, and each fourth element 2-5 is connected to the output of one of the first low noise amplifiers LNA (2-2) of the n levels of the receiving link, and is set to perform fourth out-of-band suppression processing on the received signal output by the corresponding level of first low noise amplifier LNA2-2.

[0010] This invention suppresses in-band interference at the receiving frequency point by adding a first element between the PA and the transmitting antenna to filter out out-of-band noise from the transmitted signal amplified by the PA. A second element between the receiving antenna and the first low-noise amplifier (LNA) is added to perform first out-of-band suppression processing on the transmitted signal received by the receiving antenna, preventing large signals in the transmitted signal from saturating the first-stage LNA and causing a sharp deterioration in the performance of the entire receiving link. For a single-stage first LNA, a third element connected to its output improves the gain and out-of-band suppression effect of the effective signal frequency point. For n-stage first LNAs, i fourth elements are provided, and the fourth element connected to the output of one or more first LNAs further improves the gain and out-of-band suppression effect of the effective signal frequency point. Through the addition of the first, second, third, and fourth elements, the communication and navigation functions of the integrated communication and navigation satellite terminal do not interfere with each other, ensuring normal reception of downlink signals during communication transmission and solving the wireless self-interference problem of the integrated communication and navigation satellite communication terminal.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0012] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0013] Figure 1 A schematic diagram of a dual-model terminal for related technologies;

[0014] Figure 2 This is another schematic diagram of a dual-model terminal for related technologies;

[0015] Figure 3 This is a structural block diagram of the transmission link of the integrated navigation and communication satellite communication terminal of this utility model;

[0016] Figure 4 This is a structural block diagram of the receiving link of the integrated satellite communication terminal for communication and navigation of this utility model;

[0017] Figure 5 This is a structural block diagram of the receiving link of another integrated navigation and communication satellite communication terminal of this utility model;

[0018] Figure 6 This is a structural block diagram of the receiving link of the integrated navigation and communication satellite communication terminal of this utility model;

[0019] Figure 7 This is a structural block diagram of the receiving link of the integrated satellite communication terminal for navigation and communication according to this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0021] Figure 3 This is a structural block diagram of the transmission link of the integrated navigation and communication satellite communication terminal of this utility model. Figure 4 This is a structural block diagram of the receiving link of the integrated navigation and communication satellite communication terminal of this utility model. Figure 5 This is a structural block diagram of the receiving link of the integrated communication and navigation satellite communication terminal of this utility model. The integrated communication and navigation satellite communication terminal includes: a transmitting link containing a power amplifier (PA) 1-1 and a transmitting antenna 1-2; and a receiving link containing a receiving antenna 2-1 and n levels of first low noise amplifiers (LNAs) 2-2. Figures 3 to 5 As shown, it also includes:

[0022] The first element 1-3, located between PA1-1 and transmitting antenna 1-2 in the transmission link, is configured to perform out-of-band suppression processing on the transmitted signal amplified by PA1-1. The power tolerance of the first element 1-3 is greater than the maximum power of the transmission channel located before PA1-1.

[0023] See Figure 4 When n=1, it also includes a second element 2-3 and a third element 2-4. The second element 2-3 is located between the receiving antenna 2-1 of the receiving link and the first low-noise amplifier LNA2-2 of the first stage, and is configured to perform high-power suppression and second out-of-band suppression processing on the received signal received by the receiving antenna 2-1. The third element 2-4 is located after the first low-noise amplifier LNA2-2 of the first stage of the receiving link, and is configured to perform third out-of-band suppression processing on the received signal output by the first low-noise amplifier LNA2-2 of the corresponding stage.

[0024] See Figure 5 When n>1, it also includes i fourth elements 2-5, n levels of first low noise amplifiers LNA in series, each fourth element 2-5 is connected to the output terminal of one of the n levels of first low noise amplifiers LNA2-2 in the receiving link, and is set to perform fourth out-of-band suppression processing on the received signal output by the corresponding level of first low noise amplifier LNA2-2.

[0025] This embodiment of the present disclosure adds a first element 1-3 between PA1-1 and transmitting antenna 1-2 to filter out out-of-band noise from the transmitted signal amplified by PA1-1, thereby suppressing in-band interference at the receiving frequency point from the source. A second element 2-3 is added between receiving antenna 2-1 and the first LNA 2-2 to perform a first out-of-band suppression on the transmitted signal received by receiving antenna 2-1, preventing large signals in the transmitted signal from saturating the first-level LNA and causing a sharp deterioration in the performance of the entire receiving link. For a single-level first LNA, a third element connected to the output of the first LNA improves the gain and out-of-band suppression effect of the effective signal frequency point. For n-level first LNAs, a fourth element connected to the output of one or more of the first LNAs further improves the gain and out-of-band suppression effect of the effective signal frequency point. Through the addition of the first, second, third, and fourth elements, the communication and navigation functions of the integrated communication and navigation satellite terminal do not interfere with each other, ensuring normal reception of downlink signals during communication transmission and solving the wireless self-interference problem of the integrated communication and navigation satellite communication terminal.

[0026] The transmitting antenna 1-2 and receiving antenna 2-1 of the integrated communication and navigation satellite communication terminal in this embodiment are connected to other terminals via satellite; in other words, the transmitting signal sent by the transmitting antenna 1-2 in this embodiment is sent to other terminals via satellite; similarly, the receiving signal received by the receiving antenna 2-1 is the signal sent to the current integrated communication and navigation satellite communication terminal by other terminals via satellite; the receiving antenna 2-1 in this embodiment is a broadband antenna suitable for integrated communication and navigation satellite communication terminals.

[0027] In one exemplary instance, embodiments of this disclosure may select or design a single element or a composite element based on the functions of the first element 1-3, the second element 2-3, the third element 2-4, and the fourth element 2-5 described above.

[0028] In one exemplary instance, the first element 1-3 of this disclosure embodiment includes a first cavity filter.

[0029] In this embodiment, a first cavity filter is added between PA1-1 and transmitting antenna 1-2 in the transmission link to suppress in-band interference at the receiving frequency point from the source. The transmission signal output from the RF chip's transmission channel is amplified by PA1-1, then filtered by the first cavity filter to remove out-of-band noise, and finally radiated out by transmitting antenna 1-2. Since the receiving link and transmission link of the integrated communication and navigation satellite terminal operate on different frequency bands, the first cavity filter can suppress noise at the receiving operating frequency, ensuring that transmitting antenna 1-2 does not output noise in the receiving frequency band. In this embodiment, the first component 1-3 needs to have the characteristics of high power, low insertion loss, and high out-of-band rejection, so a cavity filter is selected to achieve this.

[0030] In one exemplary instance, when the first element 1-3 of this disclosure embodiment is a first cavity filter, the first cavity filter satisfies the following parameter indicators: filter insertion loss <1.5dB, maximum power that can be withstood is 30W, and suppression of S-frequency, B2b-frequency, and other RNSS-frequency points other than B2b-frequency >45dB.

[0031] In one exemplary instance, parameters such as the center frequency and bandpass of the first cavity filter can be determined by a technician based on the parameters of the transmitted signal and the out-of-band suppression function, using processing methods commonly used by those skilled in the art.

[0032] In one exemplary instance, the second element 2-3 of this disclosure embodiment includes a second cavity filter.

[0033] In one exemplary instance, the third element 2-4 of this disclosure embodiment includes a surface acoustic wave (SAW) filter.

[0034] In one exemplary instance, the fourth element 2-5 of this disclosure embodiment includes a surface acoustic wave (SAW) filter.

[0035] In this embodiment of the receiving link, a second cavity filter is added between the receiving antenna 2-1 and the first LNA 2-2. Without the second cavity filter, large signals in the received signal would push the first LNA 2-2 to saturation, causing the performance of the entire receiving link to deteriorate sharply and fail to work properly. The second cavity filter suppresses the received signal received by the receiving antenna 2-1, ensuring that the first LNA 2-2 is in a linear amplification state. After further filtering by the subsequent SAW filter, the received signal is completely filtered out, ensuring the normal operation of the receiving link.

[0036] See Figure 6 In one exemplary embodiment, when n > 1, this disclosure further includes i fourth elements 2-5, n levels of first low-noise amplifiers (LNAs) connected in series, and each fourth element 2-5 is connected to the output terminal of one of the n levels of first low-noise amplifiers (LNAs) 2-2 in the receiving link, including:

[0037] The input terminal of the i-th fourth element 2-5 is connected to the output terminal of the n-th stage first noise amplifier LNA2-2.

[0038] It should be noted that, in this embodiment of the present disclosure, if the hardware board layout space allows, a fourth element 2-5 can be connected to the output of all first LNA2-2 simultaneously. Considering layout space, cost, and filtering requirements, the first LNA2-2 of the nth stage can be used as the starting LNA, and the first LNA2-2 of the 2nd to 3rd stages from the end (when there is a 3rd stage first LNA2-2, it is the first LNA2-2 of the nth stage, the first LNA2-2 of the (n-1)th stage, and the first LNA2-2 of the (n-2)th stage) can be connected to the output of a fourth element 2-5 respectively, which can obtain effective signal frequency gain improvement and out-of-band suppression effect.

[0039] In one exemplary instance, when the fourth element 2-5 is a surface acoustic wave (SAW) filter, the parameters of the main components of the receiving link in this embodiment of the disclosure are shown in Table 1.

[0040] Table 1

[0041]

[0042] In one exemplary instance, the distance between the first element 1-3 and the transmitting antenna 1-2 in this embodiment of the present disclosure is less than 2 cm.

[0043] In one exemplary instance, the distance between the second element 2-3 and the receiving antenna 2-1 in this embodiment of the present disclosure is less than 2 cm.

[0044] In one exemplary embodiment, the receiving antenna 2-1 is replaced with an antenna composed of L or more narrowband antennas 3-1, where L is greater than or equal to 2; correspondingly, the first LNA 2-2, the second element 2-3, and the fourth element 2-5 of the receiving link are replaced as follows:

[0045] Each narrowband antenna 3-1 is connected to m levels of second low-noise amplifiers LNA3-2, and the m levels of second low-noise amplifiers LNA3-2 connected to each narrowband antenna 3-1 are connected in series, where m is greater than or equal to 2;

[0046] For each narrowband antenna 3-1, a fifth element 3-3 is connected between the narrowband antenna 3-1 and the first-stage second low-noise amplifier LNA 3-2, which is configured to perform a fifth out-of-band suppression processing on the received signal received by the narrowband antenna 3-1.

[0047] In a narrowband receiving antenna link consisting of each narrowband antenna 3-1 and m levels of second low-noise amplifiers LNA3-2 connected thereto, one or more sixth elements 3-4 are added. Each sixth element 3-4 is connected to the output terminal of one of the m levels of second low-noise amplifiers LNA3-2 in the narrowband receiving antenna link, and is configured to perform sixth out-of-band suppression processing on the received signal output by the second low-noise amplifier LNA3-2.

[0048] In one exemplary embodiment, this disclosure adds one or more sixth elements 3-4 to a narrowband receive antenna link consisting of m levels of second LNAs 3-2 connected to each narrowband antenna 3-1, including:

[0049] When the narrowband receiving antenna link contains only one sixth element 3-4, the fifth element 3-4 is connected to the output of the m-th stage second LNA 3-2.

[0050] When the narrowband receiving antenna link contains j sixth elements 3-4, a sixth element 3-4 is connected to the output of each second LNA3-2 from the m-th level second LNA3-2 to the (m-j+1)-th level second LNA3-2, where j>1.

[0051] In one exemplary instance, the fifth element 3-3 of this disclosure embodiment includes a third cavity filter.

[0052] In one exemplary instance, the sixth element 3-4 of this disclosure embodiment includes a surface acoustic wave (SAW) filter.

[0053] In one exemplary instance, L or more narrowband antennas 3-1 can be divided according to frequency points, for example: receiving antennas at frequency S, receiving antennas at frequency B2b, and one or more receiving antennas at other RNSS frequencies besides frequency B2b. The number of classes m of the second LNAs 3-2 connected to the receiving antennas at different frequencies in this disclosure embodiment, and the parameters of each second LNA 3-2, can be determined by a technician based on the parameters of the narrowband antennas.

[0054] Figure 7 This is a structural block diagram of the receiving link of the integrated navigation and communication satellite communication terminal of this utility model, as shown below. Figure 7As shown, in this embodiment, the broadband antenna is replaced by multiple narrowband antennas 3-1 with smaller frequency bands, which narrows the receiving frequency bandwidth of each receiving antenna as much as possible, and suppresses the interference signal entering the receiving channel from the radio electromagnetic wave inlet; accordingly, the narrowband antenna 3-1 is followed by the fifth element 3-3, the second LNA 3-2 and the sixth element 3-4, which are extended in the same number as the narrowband antenna 3-1, in a parallel state; the number of parallel channels can be determined by comprehensively considering factors such as the physical space of the equipment, the frequency range of the received signal, the performance requirements of the equipment, and the cost of the equipment. Figure 6 An example is given when the number of parallel elements is 3.

[0055] In the description of this utility model, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "'mouth' structure", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, or is constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0057] Although the embodiments disclosed in this utility model are as described above, the content described is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this utility model, but the patent protection scope of this utility model shall still be defined by the appended claims.

Claims

1. A satellite communication terminal integrating communication and navigation, comprising: A transmit link comprising a power amplifier PA (1-1) and a transmit antenna (1-2), and a receive link comprising a receive antenna (2-1) and a first low-noise amplifier LNA (2-2) of n levels, characterized in that it further comprises: The first element (1-3) located between PA (1-1) and transmitting antenna (1-2) in the transmission link is configured to perform a first out-of-band suppression processing on the transmitted signal amplified by PA (1-1), and the power tolerance of the first element (1-3) is greater than the maximum power of the transmission channel located before PA (1-1); When n=1, it also includes a second element (2-3) and a third element (2-4). The second element (2-3) is located between the receiving antenna (2-1) of the receiving link and the first low-noise amplifier LNA (2-2) of the first stage, and is configured to perform high-power suppression and second out-of-band suppression processing on the received signal received by the receiving antenna (2-1). The third element (2-4) is located after the first low-noise amplifier LNA (2-2) of the first stage of the receiving link, and is configured to perform third out-of-band suppression processing on the received signal output by the first low-noise amplifier LNA (2-2) of the corresponding stage. When n > 1, it also includes i fourth elements (2-5), i is less than or equal to n, and n levels of first low noise amplifiers (LNAs) are connected in series. Each fourth element (2-5) is connected to the output of one of the n levels of first low noise amplifiers (LNAs) (2-2) in the receiving link, and is set to perform fourth out-of-band suppression processing on the received signal output by the corresponding level of first low noise amplifier (LNA) (2-2).

2. The integrated satellite communication terminal for communication and navigation according to claim 1, characterized in that, The first element (1-3) includes a first cavity filter.

3. The integrated satellite communication terminal for communication and navigation according to claim 2, characterized in that, When the first element (1-3) is a first cavity filter, the first cavity filter satisfies the following parameter specifications: The filter has an insertion loss of less than 1.5dB, can withstand a maximum power of 30W, and has a suppression of more than 45dB for the S-frequency, B2b-frequency, and other RNSS-frequency frequencies except B2b-frequency.

4. The integrated satellite communication terminal for communication and navigation according to claim 1, characterized in that, The second element (2-3) includes a second cavity filter.

5. The integrated satellite communication terminal for communication and navigation according to claim 1, characterized in that, The third element (2-4) and the fourth element (2-5) include surface acoustic wave (SAW) filters.

6. The integrated satellite communication terminal for communication and navigation according to any one of claims 1 to 5, characterized in that, When n > 1, it also includes i fourth elements (2-5), where i is less than or equal to n. The n levels of first low-noise amplifiers (LNAs) (2-2) are connected in series. Each fourth element (2-5) is connected to the output of one of the n levels of first low-noise amplifiers (LNAs) (2-2) in the receiving link, including: The input of the i-th fourth element (2-5) is connected to the output of the n-th stage first low-noise amplifier LNA (2-2).

7. The integrated satellite communication terminal for communication and navigation according to any one of claims 1 to 5, characterized in that, The distance between the first element (1-3) and the transmitting antenna (1-2) is less than 2 cm.

8. The integrated satellite communication terminal for communication and navigation according to any one of claims 1 to 5, characterized in that, The distance between the second element (2-3) and the receiving antenna (2-1) is less than 2 cm.

9. The integrated satellite communication terminal for communication and navigation according to any one of claims 1 to 5, characterized in that, The receiving antenna (2-1) is replaced with an antenna composed of L or more narrowband antennas (3-1), where L is greater than or equal to 2; correspondingly, the first low-noise amplifier LNA (2-2), the second element (2-3), and the fourth element (2-5) of the receiving link are replaced as follows: Each of the narrowband antennas (3-1) is connected to m levels of second low-noise amplifiers (LNAs) (3-2), and the m levels of second low-noise amplifiers (LNAs) (3-2) connected to each narrowband antenna (3-1) are connected in series, where m is greater than or equal to 2; For each of the narrowband antennas (3-1), a fifth element (3-3) is connected between the narrowband antenna (3-1) and the first-stage second low-noise amplifier LNA (3-2), which is configured to perform a fifth out-of-band suppression processing on the received signal received by the narrowband antenna (3-1); In a narrowband receiving antenna link consisting of each narrowband antenna (3-1) and m levels of second low-noise amplifiers (LNAs) (3-2) connected thereto, one or more sixth elements (3-4) are added. Each of the sixth elements (3-4) is connected to the output of one of the m levels of second low-noise amplifiers (LNAs) (3-2) in the narrowband receiving antenna link, and is configured to perform sixth out-of-band suppression processing on the received signal output by the second low-noise amplifier (LNA) (3-2).

10. The integrated satellite communication terminal for communication and navigation according to claim 9, characterized in that, The narrowband receiving antenna link, consisting of m levels of second-level low-noise amplifiers (LNAs) (3-2) connected to each narrowband antenna (3-1), is supplemented with one or more sixth elements (3-4), including: When the narrowband receiving antenna link contains only one sixth element (3-4), the sixth element (3-4) is connected to the output of the m-th stage second low noise amplifier LNA (3-2). When the narrowband receiving antenna link contains j sixth elements (3-4), a sixth element (3-4) is connected to the output terminal of each second low noise amplifier LNA (3-2) from the m-th stage to the (m-j+1)-th stage, where j>1.

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