Satellite data transmission PN sequence double-scrambling ground descrambling test method, system and equipment

Abstract

The invention provides a satellite data transmission PN sequence double-scrambling ground descrambling test method, system and device, and the method comprises the steps: S1, a data transmission baseband sets a demodulation descrambling parameter, demodulates a downlink data transmission signal of a descrambling satellite, and obtains a data transmission frame data stream; s2, based on the data transmission frame data stream, a data transmission baseband forwards the data transmission frame data stream to a data transmission server; and S3, setting a data transmission frame descrambling parameter and an analysis frame format of the data transmission server, descrambling the data transmission frame data packet, analyzing and processing according to the frame format to obtain each load data packet, and outputting the load data packets to load data processing quick-looking equipment. A baseband provided by the invention outputs a data transmission frame data stream after demodulation and descrambling, and the data transmission frame data stream is sent to a data transmission server for load data packet processing; and a data transmission packet analysis processing and descrambling mode of the data transmission server is set, each load data transmission packet code stream is output to complete satellite data transmission PN sequence double-scrambling ground descrambling processing, and the test method effectively provides a basis for subsequent satellite data transmission test application.

Description

Technical Field

[0001] The present invention belongs to the technical field of satellite data transmission testing, and in particular, relates to a satellite data transmission PN sequence double scrambling ground descrambling testing method, system and equipment. Background Art

[0002] The data transmission subsystem is responsible for receiving, storing, AOS framing, channel coding, scrambling, and modulating the payload data, and transmitting it to the ground through the data transmission link. In order to avoid the occurrence of long consecutive 1s or 0s and to facilitate the recovery of the signal at the receiving end, the data transmission frame needs to be randomized so that 0s and 1s are evenly distributed in time. Therefore, when designing the satellite data transmission system, the data obtained by the payload and other data that needs to be transmitted to the ground will be formatted and error-corrected. After the data is encoded, baseband processing such as scrambling will be performed, and then it will be modulated and power-amplified in an appropriate manner and transmitted to the ground through the data transmission antenna.

[0003] At present, most traditional satellite data transmission systems only perform PN sequence scrambling processing once, and ground testing corresponds to completing a PN sequence descrambling processing in the data transmission baseband equipment; due to the increase in the types of current satellite missions, in order to enhance the robustness of on-board digital transmission data streams, the application of PN sequence double scrambling in satellite data transmission is increasing, so a satellite data transmission PN sequence double scrambling ground descrambling test method is needed to complete the ground descrambling processing of satellite data transmission PN sequence double scrambling.

[0004] For the above situation, a new descrambling test method is needed to complete the ground descrambling of satellite data transmission. The traditional test method can no longer adapt to the ground descrambling of double-scrambled PN sequences of satellite data transmission.

[0005] In the field of descrambling technology, according to the retrieved patents, researchers in this field have proposed a variety of methods for data stream descrambling.

[0006] 1. Patent document CN105744354A discloses a descrambling method and system for scrambled transport streams. The solution discloses a descrambling method and a descrambling system for scrambled transport streams. The terminal obtains the identification information and scrambling information of the scrambled transport stream and sends it to the server. The server calls the corresponding descrambling device, processes the descrambling information, and returns it to the terminal for descrambling. The main descrambling process is completed by the descrambling device called by the server. This invention focuses on the descrambling method and system, without a dual scrambling descrambling processing method, and does not involve the ground descrambling test of the dual scrambling of the satellite data transmission PN sequence.

[0007] 2. Patent document CN109257088A discloses a data descrambling system and method. The scheme provides a data descrambling system, which is composed of a terminal device and an FPGA module; the terminal device uses pre-stored descrambling polynomial information to calculate the descrambling code information and sends the descrambling code information and scrambled data to the FPGA module; the FPGA module performs descrambling operations based on the scrambled data and the descrambling code information to obtain the descrambled data.

[0008] The invention proposes a data descrambling system that supports data descrambling of multiple scrambling polynomials, but has no dual scrambling and descrambling processing method. Summary of the invention

[0009] In view of the defects in the prior art, the object of the present invention is to provide a satellite data transmission PN sequence double scrambling ground descrambling test method, system and equipment.

[0010] A satellite data transmission PN sequence double scrambling ground descrambling test method provided by the present invention comprises:

[0011] Step S1: setting demodulation and descrambling parameters, demodulating and descrambling the downlink digital transmission signal of the satellite, and obtaining a digital transmission frame data stream;

[0012] Step S2: Based on the data transmission frame data stream, the data transmission baseband forwards the data transmission frame data stream to the data transmission server;

[0013] Step S3: setting the data transmission frame parameters of the data transmission server, descrambling the data transmission frame data packets, and obtaining the payload data packet streams according to the frame format analysis and outputting them to the payload data processing quick-view device.

[0014] Preferably, in the step S1, the demodulation and descrambling parameters are descrambling parameters corresponding to the modulation and scrambling of the satellite data transmission modulator.

[0015] Preferably, in step S2, the digital transmission frame data stream is output to a digital transmission server via a digital transmission baseband device.

[0016] Preferably, in step S3, the setting of the data transmission frame of the data transmission server is the descrambling parameters and frame format corresponding to the scrambling of the satellite data transmission compression and storage integrated machine; the data transmission frame data packet is descrambled by the descrambling parameters of the data transmission server, and the payload data packet is obtained according to the frame format.

[0017] A satellite data transmission PN sequence double scrambling ground descrambling test system provided by the present invention comprises:

[0018] Module M1: Set demodulation and descrambling parameters, demodulate and descramble the satellite's downlink digital transmission signal, and obtain the digital transmission frame data stream;

[0019] Module M2: based on the data transmission frame data stream, the data transmission baseband forwards the data transmission frame data stream to the data transmission server;

[0020] Module M3: Set the data transmission frame parameters of the data transmission server, descramble the data transmission frame data packets, and obtain the payload data packet streams according to the frame format analysis and output to the payload data processing quick-view device.

[0021] Preferably, in the module M1, the demodulation and descrambling parameters are descrambling parameters corresponding to the modulation and scrambling of the satellite data transmission modulator.

[0022] Preferably, in the module M2, the digital transmission frame data stream is output to the digital transmission server via a digital transmission baseband device.

[0023] Preferably, in the module M3, the setting of the data transmission frame of the data transmission server is the descrambling parameters and frame format corresponding to the scrambling of the satellite data transmission compression and storage integrated machine; the data transmission frame data packet is descrambled by the descrambling parameters of the data transmission server, and the payload data packet is obtained according to the frame format.

[0024] According to a satellite data transmission PN sequence double scrambling terrestrial descrambling test device provided by the present invention, the satellite data transmission PN sequence double scrambling terrestrial descrambling test device can implement the steps of the satellite data transmission PN sequence double scrambling terrestrial descrambling test method.

[0025] Preferably, the satellite data transmission PN sequence double scrambling ground descrambling test system comprises: an onboard data transmission RF unit, a ground data transmission link box, a down converter, a data transmission baseband, a data transmission server, and a payload quick-view terminal device;

[0026] The data transmission radio frequency stand-alone on the satellite is connected to the data transmission link box on the ground; the data transmission link box on the ground is connected to the down converter; the down converter is connected to the data transmission baseband; the data transmission baseband is connected to the data transmission server; the data transmission server is connected to the payload quick-view terminal device;

[0027] The single digital transmission radio frequency unit is used for channel transmission of downlink digital transmission signals;

[0028] The downconverter supports the spread spectrum system, completes the downconversion of the radio frequency signal to the intermediate frequency signal, and outputs it to the digital transmission baseband for demodulation;

[0029] The payload quick-view terminal device is a payload image quick-view device.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention sets the descrambling parameters of the data transmission baseband and the data transmission server respectively, descrambles the downlink data transmission frame data stream of the satellite, solves the shortcoming that the double scrambling design of the satellite data transmission PN sequence cannot be adapted on the ground, and can complete the ground descrambling processing of the double scrambling of the satellite data transmission PN sequence, effectively providing an efficient descrambling test approach for completing the satellite data transmission subsystem test related work on the ground.

[0032] 2. The baseband demodulation and descrambling provided by the present invention outputs a data transmission frame data stream and sends it to a data transmission server for payload data packet processing; a data transmission frame analysis and descrambling mode is set for the data transmission server, and each payload data transmission packet code stream is output to complete the ground descrambling processing of the satellite data transmission PN sequence double scrambling. The test method effectively provides a basis for subsequent satellite data transmission test applications.

[0033] 3. The present invention can complete the ground descrambling processing of the double scrambled satellite data transmission PN sequence by interconnecting the onboard data transmission RF unit, the ground data transmission link box, the down converter, the data transmission baseband, the data transmission server, and the payload quick-view terminal equipment. Its equipment structure can provide a basis for subsequent satellite data transmission test applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0035] Figure 1 A flow chart of the ground descrambling test of double scrambling of PN sequence for satellite data transmission provided by the present invention;

[0036] Figure 2 A connection diagram for a digital transmission wired test provided by the present invention;

[0037] Figure 3 A connection diagram for a digital transmission wireless test provided by the present invention;

[0038] Figure 4 A demodulation and scrambling parameter operation diagram of a digital transmission baseband provided by the present invention;

[0039] Figure 5 A first operation diagram of descrambling parameters of a data transmission server provided by the present invention;

[0040] Figure 6 A second operation diagram of descrambling parameters of the data transmission server provided by the present invention;

[0041] Figure 7 A third operation diagram of descrambling parameters of the data transmission server provided by the present invention;

[0042] Among them, Figure 3 middle:

[0043] 1. Image compression storage integrated machine (one-time PN sequence scrambling)

[0044] 2. Digital transmission modulator (secondary PN sequence scrambling)

[0045] 3. Coaxial switch

[0046] 4. Ground-to-ground phased array left-handed antenna

[0047] 5. Ground-to-ground phased array right-hand antenna

[0048] 6. Digital transmission link box

[0049] 7. Attenuator

[0050] 8. Downconverter

[0051] 9. Digital transmission baseband equipment (modulator corresponding to PN sequence descrambling)

[0052] 10. Data transmission server (all-in-one machine corresponding to PN sequence descrambling)

[0053] 11. Load Quick View Terminal DETAILED DESCRIPTION

[0054] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0055] Aiming at enhancing the anti-interference capability of satellite data transmission PN sequence double scrambling design, that is, the data transmission integrated machine performs primary PN sequence scrambling, and the modulator performs secondary PN sequence scrambling, the present invention provides a satellite data transmission PN sequence double scrambling ground descrambling test method; in other words, a satellite data transmission PN sequence double scrambling ground descrambling test method, system and device provided by the present invention include:

[0056] Step S1: Descrambling and scrambling parameters are set through the digital transmission baseband to demodulate and scramble the downlink digital transmission signal of the satellite to obtain a digital transmission frame data stream;

[0057] Step S2: Based on the data transmission frame data stream, the data transmission baseband forwards the data transmission frame data stream to the data transmission server;

[0058] Step S3: setting the data transmission frame descrambling parameters and parsing frame format provided by the data transmission server, descrambling the data transmission frame data packet, and obtaining each payload data packet according to the frame format parsing process and outputting it to the payload data processing quick-view device.

[0059] First, interconnect the satellite digital transmission radio frequency unit, the ground digital transmission link box, the down converter, the digital transmission baseband, the digital transmission server, and the payload quick-view terminal device, set the frequency of the down converter, and set the digital transmission demodulation parameters of the digital transmission baseband device; the digital transmission demodulation and descrambling parameters include the corresponding satellite digital transmission modulator PN sequence descrambling;

[0060] After baseband demodulation and descrambling, the data transmission frame data stream is output and sent to the data transmission server for payload data packet processing.

[0061] Set the data transmission packet parsing and descrambling mode of the data transmission server, and output the data transmission packet code stream of each payload.

[0062] This method can be used to complete the ground descrambling of the double-scrambled PN sequence of satellite data transmission, and its test method effectively provides a basis for subsequent satellite data transmission test applications.

[0063] That is to say, according to a satellite data transmission PN sequence double scrambling ground descrambling test method provided by the present invention, its data flow process includes:

[0064] Step 1: Set the demodulation and descrambling parameters, demodulate and descramble the satellite's downlink digital transmission signal, and obtain the digital transmission frame data stream;

[0065] Step 2: Based on the data transmission frame data stream, the data transmission baseband forwards the data transmission frame data stream to the data transmission server;

[0066] Step 3: Set the data transmission frame parameters of the data transmission server, descramble the data transmission frame data packets, and obtain the payload data packet streams according to the frame format analysis and output to the payload data processing quick-view device.

[0067] In the first step, the demodulation and descrambling parameters are the descrambling parameters corresponding to the modulation and scrambling of the satellite data transmission modulator;

[0068] In the second step, the digital transmission frame data stream is output to the digital transmission server through a digital transmission baseband device, i.e., a digital signal baseband transmission system;

[0069] In the third step, the data transmission frame of the data transmission server is set to the descrambling parameters and frame format corresponding to the scrambling of the satellite data transmission compression storage integrated machine; specifically, the data transmission frame data packet is descrambled by the descrambling parameters of the data transmission server, and the payload data packet is obtained according to the frame format.

[0070] According to a satellite data transmission PN sequence double scrambling ground descrambling test method provided by the present invention, its hardware includes: an on-board data transmission radio frequency unit, a ground data transmission link box, a down converter, a data transmission baseband, a data transmission server, and a payload quick-view terminal device;

[0071] The data transmission radio frequency stand-alone on the satellite is connected to the data transmission link box on the ground; the data transmission link box on the ground is connected to the down converter; the down converter is connected to the data transmission baseband; the data transmission baseband is connected to the data transmission server; the data transmission server is connected to the payload quick-view terminal device;

[0072] The digital transmission radio frequency stand-alone is used for channel transmission of downlink digital transmission signals; the down converter supports the spread spectrum system, completes the down conversion of the radio frequency signal to the intermediate frequency signal, and outputs it to the digital transmission baseband for demodulation;

[0073] The payload quick-view terminal device is a payload image quick-view device.

[0074] like Figure 1-4 As shown, the present invention provides a satellite data transmission PN sequence double scrambling ground descrambling test method, Figure 1 The satellite data transmission dual scrambling on-board ground processing flow, the on-board data transmission baseband data processor or all-in-one machine completes data formatting and primary scrambling, the modulator completes encoding, secondary scrambling, and modulation. The ground data transmission baseband completes demodulation and primary descrambling, and the data transmission server completes secondary descrambling.

[0075] like Figure 2 As shown, during the digital transmission wired test, the digital transmission coaxial switch, ground digital transmission link box, down converter, and digital transmission baseband are connected to each other through RF cables, and the digital transmission baseband and data transmission server are connected to the comprehensive test network. The digital transmission baseband is descrambled once, and the digital transmission server is descrambled twice.

[0076] like Figure 3 As shown, during the digital transmission wireless test, the digital transmission antenna, ground digital transmission link box, down converter, and digital transmission baseband are connected to each other through RF cables, and the digital transmission baseband and data transmission server are connected to the comprehensive test network. The digital transmission baseband is descrambled once, and the digital transmission server is descrambled twice.

[0077] A satellite data transmission PN sequence double scrambling ground descrambling test method provided by the present invention includes: an on-board data transmission radio frequency unit, a ground data transmission link box, a down converter, a data transmission baseband, and a data transmission server:

[0078] Specifically, according to the digital transmission test path in the digital transmission working mode, the satellite digital transmission RF stand-alone, the ground digital transmission link box, the downconverter, the digital transmission baseband equipment and the data transmission server are interconnected, and the satellite's downlink digital transmission signal is subjected to downconversion and baseband demodulation and descrambling, that is, the digital transmission modulator PN sequence is descrambled, and then the digital transmission frame data stream is output and sent to the data transmission server;

[0079] The ground data transmission server is set to the corresponding data transmission integrated machine PN sequence descrambling mode to descramble the data transmission frame, parse and output each payload data transmission packet stream, and send it to the payload terminal quick-view device. After the data transmission baseband and data transmission server are descrambled respectively, the ground descrambling processing of the satellite data transmission PN sequence double scrambling is completed.

[0080] The digital transmission radio frequency stand-alone machine is an on-board product, and in the present invention cooperates with the ground to complete the channel transmission of the downlink digital transmission signal.

[0081] The data transmission link box is a ground device, which mainly realizes the channel selection, power conditioning, monitoring and control functions of the digital transmission downlink, and all downlink signals are coupled to the switch output.

[0082] The down converter belongs to ground equipment, including X down converter and Ka down converter; the down converter belongs to ground equipment supporting spread spectrum system, completing the down conversion of radio frequency signal to intermediate frequency signal, and outputting it to digital transmission baseband for demodulation.

[0083] The digital transmission baseband is a ground device that can be set to work in different modes. It mainly receives satellite digital transmission intermediate frequency signals, completes baseband demodulation, and sends them to the digital transmission server for digital transmission frame analysis.

[0084] The digital transmission radio frequency stand-alone machine, the ground digital transmission link box, the down converter, and the digital transmission baseband are connected to each other via radio frequency cables, and the digital transmission baseband and the digital transmission server are connected to the comprehensive testing network;

[0085] The digital transmission radio frequency stand-alone device includes: a coaxial switch and a digital transmission antenna; during wireless testing, the ground antenna receives the digital transmission antenna signal and connects to the digital transmission link box; during wired testing, the coaxial switch connects to the digital transmission link box;

[0086] Specifically, the test path of the ground primary descrambling in the digital transmission working mode is the on-board digital transmission RF stand-alone / axis switch or digital transmission RF antenna → digital transmission link box → down converter → digital transmission baseband equipment; this is the primary descrambling.

[0087] Specifically, the test path of the terrestrial secondary descrambling in the digital transmission working mode is digital transmission baseband equipment→digital transmission server; this is the secondary descrambling.

[0088] Specifically, the data transmission baseband PN descrambling mode corresponds to the second PN scrambling mode of the satellite data transmission system. The corresponding PN sequence descrambling mode can be loaded according to the on-board design selection macro definition to output the scrambled data stream after the first descrambling.

[0089] Specifically, the PN descrambling mode of the data transmission server corresponds to the first PN scrambling mode of the satellite data transmission system, and the corresponding PN sequence descrambling mode can be selected according to the on-board settings to output the descrambled data after double descrambling.

[0090] Specifically, the data transmission server chooses not to descramble and adapts to the satellite data transmission PN sequence single scrambling test mode.

[0091] Specifically, the original data stored in the data transmission server is the scrambled data stream after ground one-time descrambling output by the data transmission baseband. When the data transmission server plays back the data, it selects the corresponding PN sequence descrambling mode according to the on-board settings and outputs the descrambled data after double descrambling.

[0092] The satellite data transmission PN sequence double scrambling ground descrambling test method of the present invention is performed according to the following steps:

[0093] Step 1: interconnect the data transmission RF stand-alone equipment, i.e., coaxial switch, data transmission antenna, etc., ground data transmission link box, down converter, data transmission baseband, and data transmission server, set the frequency of the down converter, set the demodulation and descrambling parameters of the baseband equipment, output the descrambled data transmission frame after baseband demodulation, and send it to the data transmission server;

[0094] Step 2: Set the data transmission server data transmission packet analysis and descrambling mode, and output each payload data transmission packet stream to the payload data processing quick-view device.

[0095] In other words, a satellite data transmission PN sequence double scrambling ground descrambling test method provided by the present invention includes:

[0096] Step S1: interconnecting a digital transmission radio frequency stand-alone machine, a ground digital transmission link box, a down converter, a digital transmission baseband, and a digital transmission server; the digital transmission radio frequency stand-alone machine includes: a coaxial switch and a digital transmission antenna;

[0097] Step S2: setting the frequency of the down converter, setting the demodulation and descrambling parameters of the data transmission baseband, outputting the demodulated and descrambled data transmission frame and sending it to the data transmission server;

[0098] Step S3: setting the data transmission frame analysis and descrambling mode parameters of the data transmission server, and outputting each payload data transmission packet code stream to the payload data processing quick-view device.

[0099] In summary, the satellite data transmission PN sequence double scrambling ground descrambling test method of the present invention solves the shortcoming that the satellite data transmission PN sequence double scrambling design cannot be adapted to the ground. The application of this method can complete the ground descrambling processing of the satellite data transmission PN sequence double scrambling, and effectively provide an efficient descrambling test approach for completing the satellite data transmission subsystem test related work on the ground.

[0100] The present invention also provides a satellite data transmission PN sequence double scrambling ground descrambling test system, which can be implemented by executing the process steps of the satellite data transmission PN sequence double scrambling ground descrambling test method, that is, those skilled in the art can understand the satellite data transmission PN sequence double scrambling ground descrambling test method as a preferred implementation of the satellite data transmission PN sequence double scrambling ground descrambling test system.

[0101] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0102] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0103] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A satellite data transmission PN sequence double scrambling ground descrambling test method, characterized in that: include: Step S1: setting demodulation and descrambling parameters, demodulating and descrambling the downlink digital transmission signal of the satellite, and obtaining a digital transmission frame data stream; Step S2: Based on the data transmission frame data stream, the data transmission baseband forwards the data transmission frame data stream to the data transmission server; Step S3: setting the data transmission frame parameters of the data transmission server, descrambling the data transmission frame data packets, and obtaining the payload data packet streams according to the frame format analysis and outputting them to the payload data processing quick-view device.

2. The satellite data transmission PN sequence double scrambling ground descrambling test method according to claim 1, characterized in that: In the step S1, the demodulation and descrambling parameters are descrambling parameters corresponding to the modulation and scrambling of the satellite data transmission modulator.

3. The satellite data transmission PN sequence double scrambling ground descrambling test method according to claim 2 is characterized in that: In the step S2, the digital transmission frame data stream is output to the digital transmission server via the digital transmission baseband device.

4. The satellite data transmission PN sequence double scrambling ground descrambling test method according to claim 3 is characterized in that: In step S3, the data transmission frame of the data transmission server is set to the descrambling parameters and frame format corresponding to the scrambling of the satellite data transmission compression storage integrated machine; the data transmission frame data packet is descrambled by the descrambling parameters of the data transmission server, and the payload data packet is obtained according to the frame format.

5. A satellite data transmission PN sequence double scrambling ground descrambling test system, characterized in that: include: Module M1: Set demodulation and descrambling parameters, demodulate and descramble the satellite's downlink digital transmission signal, and obtain the digital transmission frame data stream; Module M2: based on the data transmission frame data stream, the data transmission baseband forwards the data transmission frame data stream to the data transmission server; Module M3: Set the data transmission frame parameters of the data transmission server, descramble the data transmission frame data packets, and obtain the payload data packet streams according to the frame format analysis and output to the payload data processing quick-view device.

6. The satellite data transmission PN sequence double scrambling ground descrambling test system according to claim 5, characterized in that: In the module M1, the demodulation and descrambling parameters are descrambling parameters corresponding to the modulation and scrambling of the satellite data transmission modulator.

7. The satellite data transmission PN sequence double scrambling ground descrambling test system according to claim 6, characterized in that: In the module M2, the digital transmission frame data stream is output to the digital transmission server via a digital transmission baseband device.

8. The satellite data transmission PN sequence double scrambling ground descrambling test system according to claim 6, characterized in that: In the module M3, the setting of the data transmission frame of the data transmission server is the descrambling parameters and frame format corresponding to the scrambling of the satellite data transmission compression storage integrated machine; the data transmission frame data packet is descrambled by the descrambling parameters of the data transmission server, and the payload data packet is obtained according to the frame format.

9. A satellite data transmission PN sequence double scrambling ground descrambling test equipment, characterized in that: The satellite data transmission PN sequence double scrambling terrestrial descrambling test equipment can implement the steps of the satellite data transmission PN sequence double scrambling terrestrial descrambling test method described in any one of claims 1 to 4.

10. The satellite data transmission PN sequence double scrambling ground descrambling test system according to claim 5, characterized in that: include: Onboard data transmission radio frequency stand-alone unit, ground data transmission link box, down converter, data transmission baseband, data transmission server, and payload quick-view terminal equipment; The digital transmission radio frequency stand-alone on the satellite is connected to the digital transmission link box on the ground; the digital transmission link box on the ground is connected to the down converter; the down converter is connected to the digital transmission baseband; the digital transmission baseband is connected to the digital transmission server; The data transmission server is connected to the load quick-view terminal device; The single digital transmission radio frequency unit is used for channel transmission of downlink digital transmission signals; The down converter supports the spread spectrum system, completes the down conversion of the radio frequency signal to the intermediate frequency signal, and outputs it to the digital transmission baseband for demodulation; The payload quick-view terminal device is a payload image quick-view device.

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