Signal transmission and processing method and system, and computer device and storage medium

Abstract

The present disclosure relates to a signal transmission and processing method and system, and a computer device and a storage medium. The signal transmission and processing method is applied to a satellite communication system, and comprises: each of at least one first broadband satellite terminal sending a first broadband signal to a satellite transponder, each of at least one second broadband satellite terminal sending a second broadband signal to the satellite transponder, and each of at least one narrowband satellite terminal sending a narrowband signal to the satellite transponder; and the satellite transponder sending a mixed signal to a satellite ground station, wherein the mixed signal at least comprises the first broadband signal, the second broadband signal and the narrowband signal.

Description

Signal transmission and processing method, system, computer device and storage medium

[0001] The present disclosure is based on the Chinese patent application No. 202410447846.3, filed on April 12, 2024, entitled “Signal transmission and processing method, system, computer device and storage medium”, and claims priority to the Chinese patent application No. 202410447846.3, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present disclosure relate to, but are not limited to, a signal transmission and processing method, system, computer device and storage medium. BACKGROUND

[0003] Code Division Multiple Access (CDMA) is a basic technology of the third generation mobile communication system, which allows multiple users to share the same frequency spectrum resources simultaneously, and different users are distinguished by using different spreading codes at the receiving end. The principle of CDMA technology is based on spread spectrum technology, that is, the information data with a certain signal bandwidth to be transmitted is modulated by a high-speed pseudo-random code with a bandwidth much larger than the signal bandwidth, so that the bandwidth of the original signal data is expanded, and then modulated by a carrier and transmitted.

[0004] In the Non Terrestrial Network (NTN) communication scenario of the fifth generation mobile communication technology, Internet of Things devices are planned to communicate with ground base stations through satellites, thereby expanding the coverage and capacity of NTN, among which the Narrow Band Internet of Things (NB-IoT) technology is representative. NB-IoT adopts Orthogonal Frequency Division Multiple Access (OFDMA) technology, which allows multiple users' data to be transmitted simultaneously on different subcarriers. Under the premise of maintaining good orthogonality between carriers, NB-IoT can well avoid interference between multiple users. The integration of NB-IoT into mobile networks brings promising progress to Internet of Things connectivity, and such integration brings the expansion of coverage, the extension of battery life, global availability, and the potential of innovative solutions.

[0005] In the development of NTN, we are faced with some new technical problems and challenges. In the existing satellite communication system, there are CDMA signals in the general-purpose operating frequency band and the special-purpose operating frequency band which are isolated from each other. Considering the access of mobile Internet of Things device signals, the transmission problem of mixed signals of CDMA signals and narrowband signals in different frequency bands needs to be solved. CDMA signals and narrowband signals have different characteristics and requirements, and we need to design effective methods to correctly separate CDMA signals and narrowband signals at the receiver.

[0006] SUMMARY

[0007] The following is a summary of the subject matter of the detailed description. This summary is not intended to limit the scope of the claims.

[0008] The present disclosure provides a signal transmission and processing method, system, computer device and storage medium.

[0009] According to a first aspect of the present disclosure, a signal transmission and processing method is provided, which is applied to a satellite communication system, the satellite communication system comprising a satellite terminal, a satellite transponder, a satellite ground station and a satellite receiver; the satellite terminal comprising at least one first wideband satellite terminal, at least one second wideband satellite terminal and at least one narrowband satellite terminal; the at least one first wideband satellite terminal and the at least one narrowband satellite terminal operating in a general-purpose operating frequency band, the at least one second wideband satellite terminal operating in a special-purpose operating frequency band; the frequency point of the general-purpose operating frequency band being f0, and the bandwidth being w0; the frequency point of the special-purpose operating frequency band being f1, and the bandwidth being w1; the signal transmission and processing method comprising:

[0010] Each of the at least one first wideband satellite terminal sends a first wideband signal to the satellite transponder, each of the at least one second wideband satellite terminal sends a second wideband signal to the satellite transponder, and each of the at least one narrowband satellite terminal sends a narrowband signal to the satellite transponder;

[0011] The satellite transponder sends a mixed signal to the satellite ground station, wherein the mixed signal at least comprises the first wideband signal, the second wideband signal and the narrowband signal, and the bandwidth of the mixed signal at least comprises w0 and w1.

[0012] According to some embodiments of the present disclosure, the signal transmission and processing method further comprises:

[0013] The satellite ground station receives the mixed signal sent by the satellite transponder and transmits the mixed signal to the satellite receiver;

[0014] The satellite receiver performs first filtering on the mixed signal to obtain a general-purpose operating frequency band signal;

[0015] The satellite receiver despreads the general-purpose operating frequency band signal using a first spreading code to obtain a first despread signal, wherein the first despread signal comprises a first signal and a first channel gain, the first spreading code is a spreading code used when the first wideband signal is generated, the first signal is original data transmitted in the first wideband signal, and the first channel gain is large-scale fading caused by a distance between the at least one first wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station and small-scale fading caused by multipath effect and Doppler effect in the process of transmitting the first wideband signal;

[0016] The satellite receiver determines the first channel gain;

[0017] The satellite receiver obtains the first signal based on the first despread signal and the first channel gain;

[0018] The satellite receiver performs interference cancellation on the general-purpose operating frequency band signal to obtain the narrowband signal.

[0019] According to some embodiments of the present disclosure, the satellite receiver performs interference cancellation on the general-purpose operating frequency band signal to obtain the narrowband signal, comprising:

[0020] Based on the first channel gain, the first spreading code and the first signal, a first wideband signal containing channel gain is obtained;

[0021] The first wideband signal containing channel gain is removed from the general-purpose operating frequency band signal to obtain the narrowband signal.

[0022] According to some embodiments of the present disclosure, in response to the at least one first wideband satellite terminal being a plurality of first wideband satellite terminals, the signal transmission and processing method further comprises:

[0023] The satellite receiver calculates the received power of each first despread signal and processes a plurality of first despread signals in descending order of received power of a plurality of first despread signals.

[0024] According to some embodiments of the present disclosure, the signal transmission and processing method further comprises:

[0025] The satellite receiver performs second filtering on the mixed signal to obtain a special-purpose operating frequency band signal;

[0026] The satellite receiver despreads the special-purpose operating frequency band signal using a second spreading code to obtain a second despread signal, wherein the second despread signal comprises a second signal and a second channel gain, the second spreading code is a spreading code used when the second wideband signal is generated, the second signal is original data transmitted in the second wideband signal, and the second channel gain is large-scale fading caused by a distance between the at least one second wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station and small-scale fading caused by multipath effect and Doppler effect during transmission of the second wideband signal;

[0027] The satellite receiver determines the second channel gain;

[0028] The satellite receiver obtains the second signal based on the second despread signal and the second channel gain.

[0029] According to some embodiments of the present disclosure, the satellite receiver obtains the mixed signal first through a low-noise amplifier and then through a band-pass filter to filter out signals of other frequency bands and obtain a complete signal in a satellite communication frequency band, wherein the complete signal in the satellite communication frequency band comprises the general-purpose operating frequency band signal and the special-purpose operating frequency band signal.

[0030] According to a second aspect of the present disclosure, a signal transmission and processing system is provided, which comprises a satellite terminal, a satellite transponder, a satellite ground station and a satellite receiver, and the satellite terminal comprises:

[0031] at least one first wideband satellite terminal, each of the at least one first wideband satellite terminal being configured to send a first wideband signal to a transponder module of the satellite transponder;

[0032] at least one second wideband satellite terminal, each of the at least one second wideband satellite terminal being configured to send a second wideband signal to the transponder module of the satellite transponder;

[0033] at least one narrowband satellite terminal, each of the at least one narrowband satellite terminal being configured to send a narrowband signal to the transponder module of the satellite transponder;

[0034] wherein the at least one first wideband satellite terminal and the at least one narrowband satellite terminal operate in a general-purpose operating frequency band, and the at least one second wideband satellite terminal operates in a special-purpose operating frequency band; the general-purpose operating frequency band has a frequency point f0 and a bandwidth w0, and the special-purpose operating frequency band has a frequency point f1 and a bandwidth w1;

[0035] The satellite transponder comprises:

[0036] The forwarding module is configured to receive the first wideband signal, the second wideband signal and the narrowband signal, and transmit a mixed signal to the satellite ground station, wherein the mixed signal at least includes the first wideband signal, the second wideband signal and the narrowband signal, and a bandwidth of the mixed signal at least includes w0 and w1.

[0037] According to a third aspect of the present disclosure, a computer device is provided, comprising a memory and a processor, the memory stores a computer program, and the processor implements the steps of the signal transmission and processing method according to the first aspect when executing the computer program.

[0038] According to a fourth aspect of the present disclosure, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement the steps of the signal transmission and processing method according to the first aspect.

[0039] The signal transmission and processing method, system, computer device and storage medium provided by the embodiments of the present disclosure superimpose the wideband signal and the narrowband signal in the general-purpose working frequency band in the mixed signal, and only include the wideband signal in the special-purpose working frequency band, which is not affected by the narrowband signal. The satellite transponder transmits the mixed signal to the satellite ground station, and realizes the transmission of the mixed signal of the wideband signal and the narrowband signal in different frequency bands.

[0040] Other aspects can become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating the embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure. In the drawings:

[0042] FIG. 1 is a flow chart of a signal transmission and processing method according to an exemplary embodiment.

[0043] FIG. 2 is a diagram of a satellite forwarding communication scenario according to an exemplary embodiment.

[0044] FIG. 3 is a mixed signal diagram of signals transmitted by various satellite terminals in FIG. 2.

[0045] FIG. 4 is a flow chart of a signal transmission and processing method according to an exemplary embodiment.

[0046] FIG. 5 is a flow chart illustrating an interference cancellation operation on a general-purpose working frequency band signal to obtain a narrowband signal, according to an example embodiment.

[0047] FIG. 6 is a flow chart illustrating a signal transmission and processing method, according to an example embodiment.

[0048] FIG. 7 is a flow chart illustrating a signal transmission and processing method, according to an example embodiment.

[0049] FIG. 8 is a block diagram illustrating a signal transmission and processing system, according to an example embodiment.

[0050] FIG. 9 is a block diagram illustrating a computer device, according to an example embodiment. DETAILED DESCRIPTION

[0051] The technical solutions in the disclosed embodiments will be described clearly and completely below with reference to the accompanying drawings in the disclosed embodiments. Obviously, the described embodiments are part of the disclosed embodiments, rather than all the embodiments. Based on the disclosed embodiments, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the disclosure. It should be noted that the embodiments in the disclosure and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0052] In the existing satellite communication system, there are CDMA signals of general-purpose working frequency bands and special-purpose working frequency bands isolated from each other. Considering the access of mobile Internet of Things device signals, the transmission problem of mixed signals of CDMA signals and narrowband signals of different frequency bands needs to be solved. CDMA signals and narrowband signals have different characteristics and requirements, and we need to design an effective method to correctly separate CDMA signals and narrowband signals at the receiver.

[0053] To solve the above problems, the present disclosure provides a signal transmission and processing method, system, computer device and storage medium. The satellite communication system includes a satellite terminal, a satellite transponder, a satellite ground station and a satellite receiver; the satellite terminal includes at least one first wideband satellite terminal, at least one second wideband satellite terminal and at least one narrowband satellite terminal; the at least one first wideband satellite terminal and the at least one narrowband satellite terminal work in a general-purpose working frequency band, and the at least one second wideband satellite terminal works in a special-purpose working frequency band; the frequency point of the general-purpose working frequency band is f0, and the bandwidth is w0; the frequency point of the special-purpose working frequency band is f1, and the bandwidth is w1. Each of the at least one first wideband satellite terminal sends a first wideband signal to the satellite transponder, each of the at least one second wideband satellite terminal sends a second wideband signal to the satellite transponder, and each of the at least one narrowband satellite terminal sends a narrowband signal to the satellite transponder; the satellite transponder sends a mixed signal to the satellite ground station, wherein the mixed signal at least includes the first wideband signal, the second wideband signal and the narrowband signal, and the bandwidth of the mixed signal at least includes w0 and w1. Using the signal transmission and processing method of the present disclosure, in the mixed signal, the wideband signal and the narrowband signal in the general-purpose working frequency band are superimposed, and only the wideband signal is included in the special-purpose working frequency band, which is not affected by the narrowband signal. The satellite transponder sends the mixed signal to the satellite ground station, realizing the transmission of the mixed signal of the wideband signal and the narrowband signal in different frequency bands.

[0054] The present disclosure provides a signal transmission and processing method, which is applied to a satellite communication system. The satellite communication system includes a satellite terminal, a satellite transponder, a satellite ground station and a satellite receiver; the satellite terminal includes at least one first wideband satellite terminal, at least one second wideband satellite terminal and at least one narrowband satellite terminal; the at least one first wideband satellite terminal and the at least one narrowband satellite terminal work in a general-purpose working frequency band, and the at least one second wideband satellite terminal works in a special-purpose working frequency band; the frequency point of the general-purpose working frequency band is f0, and the bandwidth is w0; the frequency point of the special-purpose working frequency band is f1, and the bandwidth is w1. As shown in FIG. 1, the signal transmission and processing method of the present example embodiment includes:

[0055] S101, each of the at least one first wideband satellite terminal sends a first wideband signal to the satellite transponder, each of the at least one second wideband satellite terminal sends a second wideband signal to the satellite transponder, and each of the at least one narrowband satellite terminal sends a narrowband signal to the satellite transponder.

[0056] In step S101, a plurality of satellite terminals in the beam coverage range of the satellite transponder respectively send signals to the satellite transponder.

[0057] FIG. 2 is a diagram illustrating a satellite transponder communication scenario according to an exemplary embodiment. Referring to FIG. 2, there are a plurality of satellite terminals in the coverage area of satellite transponder A. Satellite terminals Dl, D2 and D3 are wideband satellite terminals operating in a general purpose operating frequency band, and transmit wideband signals dl, d2 and d3, respectively, to satellite transponder A. Satellite terminal N is a narrowband satellite terminal operating in the general purpose operating frequency band, and transmits a narrowband signal d4 to satellite transponder A. Satellite terminals Cl and C2 are wideband satellite terminals operating in a special purpose operating frequency band, and transmit wideband signals d5 and d6, respectively, to satellite transponder A. Terminals Dl, D2, D3, Cl and C2 can be satellite terminals using a Direct Sequence-Code Division Multiple Access (DS-CDMA) system, and wideband signals dl, d2, d3, d5 and d6 can be the product of the original data to be transmitted and the spreading code corresponding to the terminal.

[0058] For example, the general purpose operating frequency band is a frequency band in which a wideband signal can coexist with a narrowband signal under certain interference environment. The special purpose operating frequency band is a frequency band in which the communication quality is required to be high and the signal is sensitive to interference.

[0059] S102, the satellite transponder transmits a mixed signal to a satellite ground station, wherein the mixed signal includes at least a first wideband signal, a second wideband signal and a narrowband signal, and the bandwidth of the mixed signal includes at least w0 and wl.

[0060] The satellite transponder receives a first wideband signal transmitted by each of the at least one first wideband satellite terminal, a second wideband signal transmitted by each of the at least one second wideband satellite terminal, and a narrowband signal transmitted by each of the at least one narrowband satellite terminal, and transmits a mixed signal of the signals to the satellite ground station.

[0061] FIG. 3 is a diagram of the mixed signal of the signals transmitted by the satellite terminals in FIG. 2. As shown in FIG. 3, the bandwidth of the mixed signal includes w0 and wl. In the general purpose operating frequency band with frequency f0 and bandwidth w0, the narrowband signal d4 is superimposed with the wideband signals dl, d2 and d3. In the special purpose operating frequency band with frequency fl and bandwidth wl, only the wideband signals d5 and d6 exist. The satellite transponder A shown in FIG. 2 transmits the mixed signal to the satellite ground station.

[0062] The satellite transponder can transmit the mixed signal to the satellite ground station in a transparent transponder mode. The transparent transponder mode means that the satellite transponder does not process the signal waveform, and only acts as a radio frequency amplifier to transmit the signal to the satellite ground station. In the transparent transponder mode, the satellite transponder can amplify the signal.

[0063] In the example embodiment, the mixed signal includes the wideband signal and the narrowband signal in the general-purpose working frequency band, and only includes the wideband signal in the special-purpose working frequency band, which is not affected by the narrowband signal. The satellite transponder transmits the mixed signal to the satellite ground station, thereby realizing the transmission of the mixed signal of the wideband signal and the narrowband signal in different frequency bands.

[0064] FIG. 4 is a flowchart of a signal transmission and processing method according to an example embodiment. As shown in FIG. 4, the signal transmission and processing method includes:

[0065] S401, each of the at least one first wideband satellite terminal transmits a first wideband signal to the satellite transponder, each of the at least one second wideband satellite terminal transmits a second wideband signal to the satellite transponder, and each of the at least one narrowband satellite terminal transmits a narrowband signal to the satellite transponder.

[0066] S402, the satellite transponder transmits a mixed signal to the satellite ground station, wherein the mixed signal includes at least the first wideband signal, the second wideband signal and the narrowband signal, and the bandwidth of the mixed signal includes at least w0 and w1.

[0067] The steps S401-S402 have the same implementation as the steps S101-S102, and will not be described here.

[0068] S403, the satellite ground station receives the mixed signal transmitted by the satellite transponder and transmits the mixed signal to the satellite receiver.

[0069] The satellite ground station transmits the received mixed signal to the satellite receiver for processing.

[0070] S404, the satellite receiver performs first filtering processing on the mixed signal to obtain a general-purpose working frequency band signal.

[0071] The satellite receiver performs filtering processing on the mixed signal to extract the general-purpose working frequency band signal from the mixed signal. The satellite receiver can use a pre-selected filter to extract the general-purpose working frequency band signal from the received mixed signal. For example, the satellite receiver sets the pre-selected filter to remove signals not belonging to the general-purpose working frequency band and only keep signals in the general-purpose working frequency band, thereby extracting the general-purpose working frequency band signal.

[0072] As shown in FIG. 3, the satellite receiver uses the pre-selected filter to extract signals in the general-purpose working frequency band with a frequency point f0 and a bandwidth w0 from the mixed signal. The general-purpose working frequency band signal includes the wideband signals d1, d2 and d3 and the narrowband signal d4.

[0073] S405, the satellite receiver despreads the general purpose operating frequency band signal using the first spreading code to obtain a first despread signal, wherein the first despread signal comprises a first signal and a first channel gain, the first spreading code is a spreading code used when generating the first wideband signal, the first signal is original data transmitted in the first wideband signal, and the first channel gain is large-scale fading caused by a distance between the at least one first wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station and small-scale fading caused by multipath effect and Doppler effect in the process of transmitting the first wideband signal.

[0074] The original data that the first wideband satellite terminal needs to transmit is the first signal, the first spreading code is a spreading code corresponding to the first wideband satellite terminal, the first wideband satellite terminal spreads the first signal using the first spreading code to obtain the first wideband signal, and the process of spreading can be that a product of the first signal and the first spreading code is taken as the first wideband signal. The first channel gain is large-scale fading caused by a distance between the at least one first wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station and small-scale fading caused by multipath effect and Doppler effect in the process of transmitting the first wideband signal. The satellite receiver despreads the general purpose operating frequency band signal using the first spreading code to obtain the first despread signal comprising the first signal and the first channel gain.

[0075] Because the spreading codes used by different wideband satellite terminals have an orthogonal characteristic, in an ideal condition, inner products of different spreading codes are zero. In an actual communication system, the spreading codes with the orthogonal characteristic are adopted to reduce mutual interference between signals of different wideband satellite terminals and distinguish them. The process of despread can be that the satellite receiver generates a same spreading code sequence as the at least one first wideband satellite terminal and multiplies the same spreading code sequence with the general purpose operating frequency band signal respectively. Despread can also use an exclusive or operation and the like. Because of the orthogonal characteristic of the spreading code, wideband signals using the same spreading code can still maintain a large power after despread, while wideband signals using different spreading codes are greatly attenuated in power.

[0076] S406, the satellite receiver determines the first channel gain.

[0077] The satellite receiver estimates the first channel gain to determine the first channel gain.

[0078] In a satellite communication system, a channel gain is usually estimated by inserting a pilot or carrying a pilot sequence. For a wideband satellite terminal, a pilot sequence known by the satellite receiver can be carried, and the satellite receiver can determine a difference between the known pilot sequence and a received pilot sequence as the channel gain.

[0079] S407, the satellite receiver obtains the first signal based on the first despread signal and the first channel gain.

[0080] Because the first despread signal includes the first signal and the first channel gain, the first signal can be obtained based on the obtained first despread signal and the first channel gain, i.e., the original data transmitted by the first wideband signal.

[0081] The satellite receiver can obtain the first signal by dividing the first despread signal by the first channel gain.

[0082] S408, the satellite receiver performs interference cancellation operation on the general-purpose operating frequency band signal to obtain the narrowband signal.

[0083] The satellite receiver performs interference cancellation operation on the general-purpose operating frequency band signal to obtain the narrowband signal. The interference cancellation operation can be subtracting the product of the first channel gain, the first signal and the first spreading code from the general-purpose operating frequency band signal.

[0084] In the exemplary embodiment, the satellite receiver despreads the first despread signal from the general-purpose operating frequency band signal, estimates the first channel gain, and removes the first channel gain from the first despread signal to obtain the original data transmitted by the first wideband signal. The interference cancellation operation on the general-purpose operating frequency band signal can obtain the narrowband signal transmitted by the narrowband satellite terminal. The separation and extraction of the original data transmitted by the wideband satellite terminal and the narrowband signal transmitted by the narrowband satellite terminal in the general-purpose operating frequency band signal are realized.

[0085] FIG. 5 is a flowchart of performing interference cancellation operation on the general-purpose operating frequency band signal to obtain the narrowband signal according to an exemplary embodiment. As shown in FIG. 5, the satellite receiver performs interference cancellation operation on the general-purpose operating frequency band signal to obtain the narrowband signal, including:

[0086] S501, based on the first channel gain, the first spreading code and the first signal, a first wideband signal containing channel gain is obtained.

[0087] The first wideband signal containing channel gain can be obtained using the first channel gain, the first spreading code and the first signal, e.g., the first wideband signal containing channel gain can be the product of the first channel gain, the first spreading code and the first signal.

[0088] S502, the first wideband signal containing channel gain is removed from the general-purpose operating frequency band signal to obtain the narrowband signal.

[0089] The first wideband signal containing channel gain and the narrowband signal are superimposed in the general-purpose operating frequency band signal in the mixed signal received by the satellite receiver, and the narrowband signal can be obtained after the first wideband signal containing channel gain is removed.

[0090] In the example embodiment, the first channel gain, the first spreading code and the first signal are used to recover the first wideband signal containing the channel gain, the first wideband signal containing the channel gain is removed from the general-purpose operating frequency band signal to obtain the narrowband signal, and the extraction of the narrowband signal transmitted by the narrowband satellite terminal is realized.

[0091] In the example embodiment of the present disclosure, in response to the at least one first wideband satellite terminal being a plurality of first wideband satellite terminals, the signal transmission and processing method further comprises: the satellite receiver calculates the received power of each first despread signal, and processes the plurality of first despread signals in descending order of the received power of the plurality of first despread signals.

[0092] The satellite receiver first calculates the received power of the first despread signal corresponding to each first wideband satellite terminal, determines the first channel gain of the first despread signal with the largest received power, obtains the first signal based on the first despread signal and the first channel gain, recovers the first wideband signal containing the channel gain based on the first channel gain, the first signal and the first spreading code, removes the first wideband signal containing the channel gain from the general-purpose operating frequency band signal, and then repeats the above operation in descending order of the received power of the plurality of first despread signals to finally obtain the narrowband signal.

[0093] In the satellite transponder communication scenario shown in Fig. 2, the despread general-purpose operating frequency band signal is obtained to correspond to three despread signals of the satellite terminals D1, D2 and D3 respectively. If the received power P1 of the despread signal corresponding to the satellite terminal D1 is greater than the received power P2 of the despread signal corresponding to the satellite terminal D2, and the received power P2 of the despread signal corresponding to the satellite terminal D2 is greater than the received power P3 of the despread signal corresponding to the satellite terminal D3. The channel gain of the despread signal corresponding to the satellite terminal D1 is determined first, the original data required to be transmitted by the satellite terminal D1 is obtained based on the despread signal and the channel gain, the wideband signal containing the channel gain corresponding to the satellite terminal D1 is obtained based on the channel gain, the original data and the spread code corresponding to the satellite terminal D1, and the wideband signal containing the channel gain corresponding to the satellite terminal D1 is removed from the general-purpose operating frequency band signal. Then the channel gain of the despread signal corresponding to the satellite terminal D2 is determined, the original data required to be transmitted by the satellite terminal D2 is obtained based on the despread signal and the channel gain, the wideband signal containing the channel gain corresponding to the satellite terminal D2 is obtained based on the channel gain, the original data and the spread code corresponding to the satellite terminal D2, and the wideband signal containing the channel gain corresponding to the satellite terminal D2 is removed from the general-purpose operating frequency band signal which has removed the wideband signal containing the channel gain corresponding to the satellite terminal D1. Finally, the channel gain of the despread signal corresponding to the satellite terminal D3 is determined, the original data required to be transmitted by the satellite terminal D3 is obtained based on the despread signal and the channel gain, the wideband signal containing the channel gain corresponding to the satellite terminal D3 is obtained based on the channel gain, the original data and the spread code corresponding to the satellite terminal D3, and the wideband signal containing the channel gain corresponding to the satellite terminal D3 is removed from the general-purpose operating frequency band signal which has removed the wideband signal containing the channel gain corresponding to the satellite terminal D1 and the wideband signal containing the channel gain corresponding to the satellite terminal D2, to obtain the narrowband signal transmitted by the terminal N.

[0094] Since the signal with greater received power has better signal-to-noise ratio, in the exemplary embodiment, the wideband interference elimination is performed on the general-purpose operating frequency band signal in the order of the received power of the first despread signals from large to small, the wideband interference in the general-purpose operating frequency band signal can be eliminated better, and the narrowband signal obtained is more accurate.

[0095] Fig. 6 is a flow chart of a signal transmission and processing method according to an exemplary embodiment. Referring to Fig. 6, the signal transmission and processing method comprises:

[0096] S601, each of the at least one first wideband satellite terminal transmits a first wideband signal to the satellite transponder, each of the at least one second wideband satellite terminal transmits a second wideband signal to the satellite transponder, and each of the at least one narrowband satellite terminal transmits a narrowband signal to the satellite transponder.

[0097] S602, the satellite transponder transmits a mixed signal to the satellite ground station, wherein the mixed signal comprises at least the first wideband signal, the second wideband signal and the narrowband signal, and the bandwidth of the mixed signal comprises at least w0 and w1.

[0098] The steps S601-S602 are the same as the steps S101-S102, and will not be repeated here.

[0099] S603, the satellite ground station receives the mixed signal transmitted by the satellite transponder, and transmits the mixed signal to the satellite receiver.

[0100] The step S603 is the same as the step S403, and will not be repeated here.

[0101] S604, the satellite receiver performs a second filtering process on the mixed signal to obtain the special-purpose working frequency band signal.

[0102] The satellite receiver performs a filtering process on the mixed signal to extract the special-purpose working frequency band signal from the mixed signal. The first filtering process and the second filtering process can be the same filtering process, and the satellite receiver can use a pre-selected filter to extract the general-purpose working frequency band signal and the special-purpose working frequency band signal from the mixed signal received by the satellite receiver. For example, the satellite receiver sets the pre-selected filter to remove signals that do not belong to the general-purpose working frequency band and the special-purpose working frequency band, and only retains the signals of the general-purpose working frequency band and the signals of the special-purpose working frequency band, so that the general-purpose working frequency band signal and the special-purpose working frequency band signal can be extracted. The first filtering process and the second filtering process can also be two different filtering processes. For example, the satellite receiver sets one filter to remove signals that do not belong to the general-purpose working frequency band, and only retains the signals of the general-purpose working frequency band, so that the general-purpose working frequency band signal can be extracted. The satellite receiver sets another filter to remove signals that do not belong to the special-purpose working frequency band, and only retains the signals of the special-purpose working frequency band, so that the special-purpose working frequency band signal can be extracted.

[0103] In the satellite transponder communication scenario shown in FIG. 2, the satellite receiver can use a pre-selected filter to perform a filtering process to extract the general-purpose working frequency band signal comprising signals from the satellite terminals D1, D2, D3 and N and the special-purpose working frequency band signal comprising signals from the satellite terminals C1 and C2 from the received mixed signal. The satellite receiver can also use two different filters to perform two different filtering processes to extract the general-purpose working frequency band signal comprising signals from the satellite terminals D1, D2, D3 and N and the special-purpose working frequency band signal comprising signals from the satellite terminals C1 and C2 from the received mixed signal.

[0104] S605, the satellite receiver despreads the special purpose operating band signal using a second spreading code to obtain a second despread signal, wherein the second despread signal comprises a second signal and a second channel gain, the second spreading code is a spreading code used when generating the second wideband signal, the second signal is original data transmitted in the second wideband signal, and the second channel gain is large-scale fading caused by a distance between the at least one second wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station, and small-scale fading caused by multipath effect and Doppler effect in the process of transmitting the second wideband signal.

[0105] The original data that the second wideband satellite terminal needs to transmit is the second signal, the second spreading code is a spreading code corresponding to the second wideband satellite terminal, and the second wideband satellite terminal spreads the second signal using the second spreading code to obtain the second wideband signal. The process of spreading can be that a product of the second signal and the second spreading code is taken as the second wideband signal. The large-scale fading caused by the distance between the at least one second wideband satellite terminal and the satellite transponder and the distance between the satellite transponder and the satellite ground station, and the small-scale fading caused by the multipath effect and the Doppler effect in the process of transmitting the second wideband signal is the second channel gain. The satellite receiver despreads the special purpose operating band signal using the second spreading code to obtain the second despread signal comprising the second signal and the second channel gain.

[0106] Because the spreading codes used by different wideband satellite terminals have an orthogonal characteristic, the inner product of different spreading codes is zero under ideal conditions. In an actual communication system, the spreading codes with the orthogonal characteristic are adopted to reduce mutual interference between signals of different wideband satellite terminals and distinguish them. The process of despread can be that the satellite receiver generates a same spreading code sequence as the at least one second wideband satellite terminal and respectively multiplies the same spreading code sequence with the special purpose operating band signal. Despread can also use an exclusive or operation and the like. Because of the orthogonal characteristic of the spreading code, the wideband signals using the same spreading code can still maintain a large power after despread, while the wideband signals using different spreading codes are greatly attenuated in power.

[0107] S606, the satellite receiver determines the second channel gain.

[0108] The satellite receiver estimates the second channel gain to determine the second channel gain.

[0109] In a satellite communication system, a pilot is usually inserted or a pilot sequence is carried to estimate the channel gain. For a wideband satellite terminal, a pilot sequence known by the satellite receiver can be carried, and the satellite receiver can determine a difference between the known pilot sequence and a received pilot sequence as the channel gain.

[0110] S607, the satellite receiver obtains the second signal based on the second despread signal and the second channel gain.

[0111] Because the second despread signal includes the second signal and the second channel gain, the second signal can be obtained based on the obtained second despread signal and the second channel gain, i.e., the original data transmitted by the second wideband satellite terminal.

[0112] The satellite receiver can obtain the second signal by dividing the second despread signal by the second channel gain.

[0113] In the exemplary embodiment, the satellite receiver can also extract the original data transmitted by the wideband satellite terminal working in the special-purpose operating frequency band, and the signal processing range is wider.

[0114] In the exemplary embodiment of the present disclosure, the satellite receiver obtains the mixed signal first through a low-noise amplifier and then through a band-pass filter to filter out signals of other frequency bands and obtain complete signals in the satellite communication frequency band, wherein the complete signals in the satellite communication frequency band include signals of the general-purpose operating frequency band and signals of the special-purpose operating frequency band. In the exemplary embodiment, filtering out signals of other frequency bands can reduce interference caused by signals of other frequency bands.

[0115] In the exemplary embodiment of the present disclosure, the first signal, the second signal, and the narrowband signal can all be modulated signals, which are signals converted from original signals by changing certain characteristics of carrier signals. The mixed signal received by the satellite receiver includes noise, which can include shot noise, flicker noise generated by active devices such as amplifiers and mixers in the satellite transponder, and thermal noise generated by passive devices. When demodulating, the signal-to-noise ratio needs to be kept above a demodulation threshold to reliably recover the original signal. Demodulation is a process of recovering an original signal from a modulated signal using a modulation mode corresponding to the modulated signal, and the modulation mode can be BPSK and QPSK. The demodulation threshold is the minimum signal-to-noise ratio required by the satellite receiver when demodulating the modulated signal.

[0116] The exemplary embodiment of the present disclosure provides a signal transmission and processing method applied to a satellite communication system, wherein the satellite communication system includes a satellite terminal, a satellite transponder, a satellite ground station, and a satellite receiver; the satellite terminal includes at least one first wideband satellite terminal, at least one second wideband satellite terminal, and at least one narrowband satellite terminal; the at least one first wideband satellite terminal and the at least one narrowband satellite terminal work in a general-purpose operating frequency band, and the at least one second wideband satellite terminal works in a special-purpose operating frequency band; the frequency point of the general-purpose operating frequency band is f0, and the bandwidth is w0; the frequency point of the special-purpose operating frequency band is f1, and the bandwidth is w1. As shown in FIG. 7, the signal transmission and processing method shown in the exemplary embodiment includes:

[0117] S701. Each at least one first broadband satellite terminal sends a first broadband signal to a satellite transponder, each at least one second broadband satellite terminal sends a second broadband signal to a satellite transponder, and each at least one narrowband satellite terminal sends a narrowband signal to a satellite transponder.

[0118] S702: The satellite transponder sends a mixed signal to the satellite ground station, where the mixed signal includes at least a first broadband signal, a second broadband signal, and a narrowband signal, and the bandwidth of the mixed signal includes at least w0 and w1.

[0119] S703: The satellite ground station receives the mixed signal sent by the satellite transponder, and transmits the mixed signal to the satellite receiver.

[0120] S704: The satellite receiver performs a first filtering process on the mixed signal to obtain a general-purpose working frequency band signal.

[0121] S705. The satellite receiver despreads a general-purpose working frequency band signal using a first spreading code to obtain a first despread signal, where the first despread signal includes a first signal and a first channel gain. The first spreading code is a spreading code used when generating a first broadband signal. The first signal is original data transmitted in the first broadband signal. The first channel gain is large-scale fading caused by the distance between at least one first broadband satellite terminal and a satellite transponder and the distance between the satellite transponder and a satellite ground station during transmission of the first broadband signal, and small-scale fading caused by multipath effect and Doppler effect.

[0122] S706: The satellite receiver determines a first channel gain.

[0123] S707: The satellite receiver obtains a first signal based on the first despread signal and the first channel gain.

[0124] S708: The satellite receiver obtains a first wideband signal including the channel gain based on the first channel gain, the first spreading code, and the first signal.

[0125] S709: The satellite receiver removes the first wideband signal including the channel gain from the general-purpose working frequency band signal to obtain a narrowband signal.

[0126] S710: The satellite receiver performs a second filtering process on the mixed signal to obtain a special-purpose working frequency band signal.

[0127] S711, the satellite receiver despreads the special-purpose operating frequency band signal using the second spreading code to obtain a second despread signal, wherein the second despread signal comprises a second signal and a second channel gain, the second spreading code is a spreading code used when the second wideband signal is generated, the second signal is original data transmitted in the second wideband signal, and the second channel gain is large-scale fading caused by a distance between the at least one second wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station and small-scale fading caused by multipath effect and Doppler effect in the process of transmitting the second wideband signal.

[0128] S712, the satellite receiver determines the second channel gain.

[0129] S713, the satellite receiver obtains the second signal based on the second despread signal and the second channel gain.

[0130] In the example embodiment, the satellite transponder transponds a mixed signal of the wideband signal transmitted by the wideband satellite terminal operating in the general-purpose operating frequency band, the narrowband signal transmitted by the narrowband satellite terminal operating in the general-purpose operating frequency band, and the wideband signal transmitted by the wideband satellite terminal operating in the special-purpose operating frequency band to the satellite ground station, the satellite ground station transmits the mixed signal to the satellite receiver, and the satellite receiver extracts the original data transmitted in the wideband signal transmitted by the wideband satellite terminal operating in the general-purpose operating frequency band, the original data transmitted in the wideband signal transmitted by the wideband satellite terminal operating in the special-purpose operating frequency band, and the narrowband signal transmitted by the narrowband satellite terminal operating in the general-purpose operating frequency band from the mixed signal. The transmission of the mixed signal of the different frequency band wideband signal and the narrowband signal is implemented, and the extraction of the original data transmitted in the wideband signal and the narrowband signal in the mixed signal is implemented.

[0131] The exemplary embodiment of the present disclosure provides a signal transmission and processing system, as shown in Fig. 8, which comprises a satellite terminal 81, a satellite transponder 82, a satellite ground station 83 and a satellite receiver 84. The satellite terminal 81 comprises at least one first wideband satellite terminal 811, at least one second wideband satellite terminal 812 and at least one narrowband satellite terminal 813. The satellite transponder 82 comprises a transponder module 821. The at least one first wideband satellite terminal 811 and the at least one narrowband satellite terminal 813 work in a general-purpose working frequency band, and the at least one second wideband satellite terminal 812 works in a special-purpose working frequency band; the frequency point of the general-purpose working frequency band is f0, and the bandwidth is w0; the frequency point of the special-purpose working frequency band is f1, and the bandwidth is w1. Each of the at least one first wideband satellite terminal 811 is configured to send a first wideband signal to the transponder module 821 of the satellite transponder 82. Each of the at least one second wideband satellite terminal 812 is configured to send a second wideband signal to the transponder module 821 of the satellite transponder 82. Each of the at least one narrowband satellite terminal 813 is configured to send a narrowband signal to the transponder module 821 of the satellite transponder 82. The transponder module 821 is configured to receive the first wideband signal, the second wideband signal and the narrowband signal, and send a mixed signal to the satellite ground station 83, wherein the mixed signal at least comprises the first wideband signal, the second wideband signal and the narrowband signal, and the bandwidth of the mixed signal at least comprises w0 and w1.

[0132] In the exemplary embodiment of the present disclosure, in the mixed signal, the wideband signal and the narrowband signal in the general-purpose working frequency band are superimposed, and only the wideband signal is included in the special-purpose working frequency band and is not affected by the narrowband signal. The transponder module 821 of the satellite transponder 82 sends the mixed signal to the satellite ground station 83, thereby realizing the transmission of the mixed signal of the wideband signal and the narrowband signal in different frequency bands.

[0133] In the exemplary embodiment of the present disclosure, the satellite receiver 84 comprises a filtering module, a despreading module and an interference cancellation module. The satellite ground station 83 comprises a signal transceiver module, which is configured to receive the mixed signal sent by the transponder module 821 of the satellite transponder 82 and transmit the mixed signal to the filtering module of the satellite receiver 84.

[0134] The filtering module of the satellite receiver 84 is configured to perform first filtering processing on the mixed signal to obtain a general-purpose working frequency band signal.

[0135] The despreading module of the satellite receiver 84 is configured to despread the general purpose operating band signal using the first spreading code to obtain a first despread signal, wherein the first despread signal comprises a first signal and a first channel gain, the first spreading code is a spreading code used when generating the first wideband signal, the first signal is original data transmitted in the first wideband signal, and the first channel gain is large-scale fading caused by a distance between the at least one first wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station and small-scale fading caused by multipath effects and Doppler effects in the process of transmitting the first wideband signal;

[0136] The despreading module of the satellite receiver 84 is further configured to determine the first channel gain.

[0137] The despreading module of the satellite receiver 84 is further configured to obtain the first signal based on the first despread signal and the first channel gain.

[0138] The interference cancellation module of the satellite receiver 84 is configured to perform an interference cancellation operation on the general purpose operating band signal to obtain the narrowband signal.

[0139] In an example embodiment of the present disclosure, the interference cancellation module of the satellite receiver 84 is further configured to:

[0140] obtain the first wideband signal comprising the channel gain based on the first channel gain, the first spreading code and the first signal;

[0141] remove the first wideband signal comprising the channel gain from the general purpose operating band signal to obtain the narrowband signal.

[0142] In an example embodiment of the present disclosure, in response to the at least one first wideband satellite terminal being a plurality of first wideband satellite terminals, the despreading module of the satellite receiver 84 is further configured to:

[0143] calculate a received power of each first despread signal and process the plurality of first despread signals in descending order of the received power of the plurality of first despread signals.

[0144] In an example embodiment of the present disclosure, the filtering module of the satellite receiver 84 is further configured to perform a second filtering process on the mixed signal to obtain a special-purpose operating frequency band signal; the despreading module of the satellite receiver 84 is further configured to use a second spreading code to despread the special-purpose operating frequency band signal to obtain a second despread signal, wherein the second despread signal includes a second signal and a second channel gain, the second spreading code is a spreading code used when the second wideband signal is generated, the second signal is original data transmitted in the second wideband signal, and the second channel gain is large-scale fading caused by a distance between at least one second wideband satellite terminal and the satellite transponder and a distance between the satellite transponder and the satellite ground station and small-scale fading caused by multipath effect and Doppler effect during transmission of the second wideband signal; and the despreading module of the satellite receiver 84 is further configured to determine the second channel gain; and the despreading module of the satellite receiver 84 is further configured to obtain the second signal based on the second despread signal and the second channel gain.

[0145] In an example embodiment of the present disclosure, the mixed signal obtained by the filtering module of the satellite receiver 84 is first amplified by a low-noise amplifier and then filtered by a band-pass filter to filter out signals of other frequency bands and obtain a complete signal in a satellite communication frequency band, wherein the complete signal in the satellite communication frequency band includes the general-purpose operating frequency band signal and the special-purpose operating frequency band signal.

[0146] The above-mentioned modules in the signal transmission and processing system can be implemented by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in a computer device in software form, so as to be called and executed by a processor to perform operations corresponding to the above-mentioned modules.

[0147] In an example embodiment, a computer device is provided, which includes a processor and a memory, and the memory stores a computer program, and the processor implements the steps of any of the above-mentioned signal transmission and processing methods when executing the computer program.

[0148] In an example embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program implements the steps of any of the above-mentioned signal transmission and processing methods when executed by a processor. The computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0149] In an example embodiment, a computer program product is provided, which includes a computer program, and the computer program implements the steps of any of the above-mentioned signal transmission and processing methods when executed by a processor.

[0150] Referring to FIG. 9, a structural block diagram of a computer device according to the present disclosure will now be described, which includes a computing unit 901 that can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 902 or a computer program loaded into a random access memory (RAM) 903 from a storage unit 908. In the RAM 903, various programs and data required for the operation of the computer device 900 can also be stored. The computing unit 901, the ROM 902, and the RAM 903 are connected to each other through a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0151] A plurality of components in the computer device 900 are connected to the I / O interface 905, including an input unit 906, an output unit 907, a storage unit 908, and a communication unit 909. The input unit 906 can be any type of device that can input information to the computer device 900, can receive inputted digital or character information, and generate key signal inputs related to user settings and / or function controls of the computer device 900, and can include, but is not limited to, a mouse, a keyboard, a touch screen, a track pad, a track ball, a joystick, a microphone, and / or a remote controller. The output unit 907 can be any type of device that can present information, and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 908 can include, but is not limited to, a magnetic disk, an optical disk. The communication unit 909 allows the computer device 900 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth™ device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0152] The computing unit 901 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the computing unit 901 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 901 performs various methods and processes described above, such as the signal transmission and processing methods. For example, in some embodiments, the signal transmission and processing methods can be implemented as a computer software program tangibly embodied in a machine-readable medium, such as the storage unit 908. In some embodiments, part or all of the computer program can be loaded and / or installed onto the computer device 900 via the ROM 902 and / or the communication unit 909. When the computer program is loaded onto the RAM 903 and executed by the computing unit 901, one or more steps of the signal transmission and processing methods described above can be performed. Alternatively, in other embodiments, the computing unit 901 can be configured to perform the signal transmission and processing methods by any other appropriate means, such as by means of firmware.

[0153] The computer device 900 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic elements, for performing the signal transmission and processing methods described above.

[0154] In the description of the specification, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0155] In the description of the specification, the description referring to the terms “embodiment”, “exemplary embodiment”, “some implementations”, “illustrative implementation”, “example”, etc. means that the specific features, structures, materials or characteristics described in connection with the implementation or example are included in at least one implementation or example of the present disclosure.

[0156] In the description of the specification, the illustrative description of the above terms does not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more implementations or examples.

[0157] In the description of the disclosure, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the disclosure.

[0158] It can be understood that the terms "first", "second" and the like used in the disclosure can be used in the disclosure to describe various structures, but these structures are not limited by these terms. These terms are only used to distinguish the first structure from another structure.

[0159] In one or more drawings, the same elements are denoted by similar reference numerals. For the sake of clarity, parts of the drawings are not drawn to scale. In addition, certain known parts can not be shown. For the sake of simplicity, structures obtained after several steps can be described in one drawing. Many specific details of the disclosure are described below, such as the structure, material, size, processing process and technology of the device, in order to more clearly understand the disclosure. But as those skilled in the art can understand, the disclosure can be implemented without these specific details.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the disclosure, and not to limit them; although the disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the disclosure. Industrial applicability

[0161] The signal transmission and processing method, system, computer device and storage medium provided by the embodiments of the disclosure, each of the at least one first wideband satellite terminal sends a first wideband signal, each of the at least one second wideband satellite terminal sends a second wideband signal, and each of the at least one narrowband satellite terminal sends a narrowband signal to the satellite transponder; the satellite transponder sends a mixed signal to the satellite ground station, wherein the mixed signal at least includes the first wideband signal, the second wideband signal and the narrowband signal. In the mixed signal, the wideband signal and the narrowband signal in the general-purpose working frequency band are superimposed, and only the wideband signal is included in the special-purpose working frequency band, which is not affected by the narrowband signal. The satellite transponder sends this mixed signal to the satellite ground station, realizing the transmission of the mixed signal of the wideband signal and the narrowband signal in different frequency bands.

Claims

1. A signal transmission and processing method, wherein: The invention is applied to a satellite communication system, the satellite communication system comprising a satellite terminal, a satellite transponder, a satellite ground station and a satellite receiver; the satellite terminal comprising at least one first broadband satellite terminal, at least one second broadband satellite terminal and at least one narrowband satellite terminal; the at least one first broadband satellite terminal and the at least one narrowband satellite terminal operate in a general-purpose operating frequency band, and the at least one second broadband satellite terminal operates in a special-purpose operating frequency band; the general-purpose operating frequency band has a frequency point f0 and a bandwidth w0; the special-purpose operating frequency band has a frequency point f1 and a bandwidth w1; The signal transmission and processing method includes: Each of the at least one first broadband satellite terminal sends a first broadband signal to the satellite transponder, each of the at least one second broadband satellite terminal sends a second broadband signal to the satellite transponder, and each of the at least one narrowband satellite terminal sends a narrowband signal to the satellite transponder; The satellite transponder sends a mixed signal to the satellite ground station, wherein the mixed signal includes at least the first broadband signal, the second broadband signal and the narrowband signal, and the bandwidth of the mixed signal includes at least w0 and w1.

2. The signal transmission and processing method according to claim 1, further comprising: The satellite ground station receives the mixed signal sent by the satellite transponder and transmits the mixed signal to the satellite receiver; The satellite receiver performs a first filtering process on the mixed signal to obtain a general-purpose working frequency band signal; The satellite receiver despreads the general-purpose working frequency band signal using a first spreading code to obtain a first despread signal, wherein the first despread signal includes a first signal and a first channel gain, the first spreading code is a spreading code used when generating the first broadband signal, the first signal is original data transmitted in the first broadband signal, and the first channel gain is large-scale fading caused by the distance between the at least one first broadband satellite terminal and the satellite transponder and the distance between the satellite transponder and the satellite ground station, and small-scale fading caused by multipath effect and Doppler effect during transmission of the first broadband signal; The satellite receiver determines the first channel gain; The satellite receiver obtains the first signal based on the first despread signal and the first channel gain; The satellite receiver performs interference elimination on the general-purpose working frequency band signal to obtain the narrowband signal.

3. The signal transmission and processing method according to claim 2, wherein: The satellite receiver performs an interference elimination operation on the general-purpose working frequency band signal to obtain the narrowband signal, including: obtaining a first broadband signal including a channel gain based on the first channel gain, the first spreading code, and the first signal; The first wideband signal including the channel gain is removed from the general-purpose working frequency band signal to obtain the narrowband signal.

4. The signal transmission and processing method according to claim 3, wherein: In response to the at least one first broadband satellite terminal being a plurality of first broadband satellite terminals, the method further includes: The satellite receiver calculates the receiving power of each of the first despread signals and processes the plurality of first despread signals in descending order of their receiving power.

5. The signal transmission and processing method according to claim 2, further comprising: The satellite receiver performs a second filtering process on the mixed signal to obtain a special-purpose working frequency band signal; The satellite receiver despreads the special-purpose working frequency band signal using a second spreading code to obtain a second despread signal, wherein the second despread signal includes a second signal and a second channel gain, the second spreading code is a spreading code used when generating the second broadband signal, the second signal is original data transmitted in the second broadband signal, and the second channel gain is large-scale fading caused by the distance between the at least one second broadband satellite terminal and the satellite transponder and the distance between the satellite transponder and the satellite ground station, and small-scale fading caused by multipath effect and Doppler effect during transmission of the second broadband signal; The satellite receiver determines the second channel gain; The satellite receiver obtains the second signal based on the second despread signal and the second channel gain.

6. The signal transmission and processing method according to claim 5, wherein: The mixed signal obtained by the satellite receiver first passes through a low-noise amplifier and then through a bandpass filter to filter out signals in other frequency bands, thereby obtaining a complete signal within the satellite communication frequency band, wherein the complete signal within the satellite communication frequency band includes the general-purpose working frequency band signal and the special-purpose working frequency band signal.

7. A signal transmission and processing system, wherein: The signal transmission and processing system includes a satellite terminal, a satellite transponder, a satellite ground station and a satellite receiver, wherein the satellite terminal includes: at least one first broadband satellite terminal, each of the at least one first broadband satellite terminal being configured to transmit a first broadband signal to a forwarding module of the satellite transponder; at least one second broadband satellite terminal, each of the at least one second broadband satellite terminal being configured to transmit a second broadband signal to the forwarding module of the satellite transponder; at least one narrowband satellite terminal, each of the at least one narrowband satellite terminal being configured to transmit a narrowband signal to the forwarding module of the satellite transponder; The at least one first broadband satellite terminal and the at least one narrowband satellite terminal operate in a general-purpose operating frequency band, and the at least one second broadband satellite terminal operates in a special-purpose operating frequency band; the general-purpose operating frequency band has a frequency point f0 and a bandwidth w0; the special-purpose operating frequency band has a frequency point f1 and a bandwidth w1; The satellite transponder comprises: The forwarding module is configured to receive the first broadband signal, the second broadband signal and the narrowband signal, and send a mixed signal to the satellite ground station, wherein the mixed signal includes at least the first broadband signal, the second broadband signal and the narrowband signal, and the bandwidth of the mixed signal includes at least w0 and w1.

8. A computer device, wherein: The method comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the signal transmission and processing method according to any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, wherein: A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the signal transmission and processing method according to any one of claims 1 to 6 are implemented.

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