Design method of high-mobility stealth satellite communication system

Abstract

The application discloses a design method of a high-mobility stealth satellite communication system and relates to the technical field of satellite communication. The application comprises the following steps: step a: system silence and state presetting: a control center makes a satellite of a space segment enter an electromagnetic silence state, a satellite platform starts surface thermal management and retracts a protruding structure, and an orbit maneuver with no fixed period is planned and executed. The application improves the concealment and survivability of the satellite platform in orbit. By making the satellite enter a silence and survival state and implementing thermal management and shape control, combined with the orbit maneuver with no fixed period, the physical and orbit characteristics of the satellite are difficult to be observed and predicted for a long time, traditional detection and tracking means based on a fixed shape and a periodic orbit are invalid, and exposure risk of space assets is controlled. Meanwhile, communication adopts a "zero handshake" burst access mechanism based on one-time instructions, and open signaling interaction in a link establishment process is completely eliminated.

Description

Technical Field

[0001] This invention relates to the field of satellite communication technology, and in particular to a design method for a highly mobile stealth satellite communication system. Background Technology

[0002] Satellite communication systems utilize artificial Earth satellites as relay stations to forward radio signals, enabling long-distance communication between earth stations. They can overcome geographical barriers and provide stable and reliable communication services to remote areas such as oceans, deserts, and mountains. The system supports real-time transmission of various service types, including voice, data, and video, and is widely used in military, aviation, maritime, and emergency communication fields. Its core components include the space segment, ground segment, and link segment. Due to its reliance on geostationary orbit or low Earth orbit satellite constellations, the system has the advantages of wide-area coverage, high availability, and strong disaster resistance.

[0003] Existing satellite communication systems typically consist of geostationary or low-to-medium Earth orbit constellation platforms, centralized ground gateway stations and network control centers, and various fixed or mobile user terminals. These satellite platforms are usually equipped with large rigid or deployable parabolic antennas, use solid-state power amplifiers with fixed or predictable frequency bands, and rely on periodically operating chemical thrusters for limited orbital position maintenance and adjustment. The satellite's orbital parameters, shape profile, thermal radiation characteristics, and communication signal frame structure are all publicly available or observable over long periods. Furthermore, the communication protocols and signal waveforms of the entire system are relatively standardized, and the establishment of inter-satellite links and satellite-to-ground links depends on pre-set, continuously broadcast pilot and beacon signals. Data processing and routing are highly dependent on fixed ground infrastructure.

[0004] This spacecraft platform, composed of publicly available orbital parameters and a fixed physical shape, makes space targets easily identifiable and cataloged over long periods by observation methods such as optics and radar. Its large antennas and fixed pointing patterns, along with standardized communication signal formats and continuously transmitted pilot signals, collectively form stable and unique electromagnetic radiation characteristics. Ground-based or space-based monitoring networks can easily correlate, locate, and continuously track signal sources through feature comparison. However, when faced with targeted countermeasures, this system exposes significant weaknesses in multiple aspects, from the satellite itself to the signal link.

[0005] 1. The limited and slow maneuverability of the satellite platform based on chemical propulsion cannot support its rapid large-scale and unconventional orbital transfer to escape the threat area after being locked on; the fixed nature of its signal protocol and waveform allows adversaries to use known characteristics to carry out efficient targeted jamming or to simulate legitimate signals to deceive, while the system itself lacks effective real-time signal hiding and waveform agility mechanisms to deal with it.

[0006] 2. For user terminals that require high-speed mobility and random appearance, this system, which relies on fixed gateway stations and long link establishment time, is difficult to complete fast, covert and reliable access and data transmission within the user's extremely short communication time window. Ultimately, the entire system exhibits high predictability and observability in all aspects from physical existence to signal transmission, which is not ideal for application environments that require covert existence and highly dynamic random access.

[0007] This not only makes its communication links vulnerable to interception, interference, or deception, but also makes the location and status of the entire space asset transparent to potential adversaries, resulting in a loss of the suddenness and concealment of tactical actions. Furthermore, when facing escalating adversarial methods, its key nodes face a high risk of being physically destroyed or blinded, and the system's survivability is severely insufficient.

[0008] To address these issues, we provide a design method for a highly mobile stealth satellite communication system. Summary of the Invention

[0009] The purpose of this invention is to provide a design method for a highly mobile stealth satellite communication system. By combining silent lurking and burst communication with dynamic waveform generation based on environmental awareness, intelligent jump routing, and accompanying cooperative interference, this invention solves the problems of predictable physical presence, easily intercepted signal transmission, and insufficient mobility in the design methods of existing satellite communication systems in adversarial environments.

[0010] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0011] This invention relates to a design method for a highly mobile stealth satellite communication system, comprising the following steps:

[0012] Step a: System silence latency and state preset: The control center puts the satellite in the space segment into an electromagnetic silence state, the satellite platform initiates surface thermal management and retracts the protruding structure, and at the same time plans and executes orbital maneuvers without a fixed period.

[0013] Step b: Covert communication demand triggering and dynamic path planning: Highly mobile user terminals or mobile gateways send communication requests; the control center calculates the covert communication path and generates a one-time-use instruction set for the nodes on the path;

[0014] Step c: Burst access based on pre-synchronization "zero handshake": The user terminal directly transmits communication signals in a burst mode at the precise time and spatial location specified by the instruction set; the target satellite completes the receiving beam pointing and parameter configuration according to the same instruction set;

[0015] Step d: Generation and transmission of dynamic covert signals: The signal transmitting node senses the characteristics of background electromagnetic noise according to the instruction set, dynamically generates a communication waveform that matches the local background noise, and transmits it.

[0016] Step e: On-board signal processing and intelligent routing: After receiving the signal, the relay satellite performs rapid demodulation and decryption, and selects the next-hop node through the on-board processing unit; before the signal is forwarded, its communication parameters are dynamically transformed and re-encrypted;

[0017] Step f: Coordinated electromagnetic cover and active jamming: At the same time as the communication link is established, the accompanying sensing satellite or a designated cooperative satellite transmits cover signals in the direction of potential eavesdropping and jamming sources;

[0018] Step g: Communication termination and state reset: All nodes participating in the communication immediately terminate signal transmission and clear relevant parameters after data transmission is completed; then the nodes return to a silent state, and the satellite platform initiates subsequent orbital maneuvers.

[0019] By employing thermal management and structural integration, the satellite's radar cross-section and infrared radiation characteristics are reduced, enhancing its physical stealth capabilities. The non-fixed-period orbital maneuvers make it difficult to accurately predict and track the satellite's orbital parameters, such as semi-major axis, inclination, and right ascension of the ascending node, increasing the complexity of space situational awareness and thus improving the platform's on-orbit survivability. Dynamically planning communication paths based on real-time threats avoids the use of fixed, predictable satellite-to-ground or inter-satellite links, significantly increasing the randomness and unpredictability of communication initiation and routing. The use of a one-time command set ensures the uniqueness of spatiotemporal and signal parameters for each communication. Even if some parameters of a single communication are detected by the enemy, they cannot be used to predict or interfere with subsequent communications, effectively countering [enemy threats]. Pattern recognition and predictive attacks based on historical data completely eliminate the public or periodic signaling interactions used for link establishment, synchronization, and maintenance in traditional communication, fundamentally reducing signal exposure time. Burst communication compresses communication activities into extremely short millisecond-level time windows, making it extremely difficult for external detection systems to intercept, locate, identify, and react to signals within a limited timeframe. This achieves low-probability interception or low-probability detection at the access point. By dynamically hiding or integrating the time-frequency domain characteristics of communication signals into real-time changing local electromagnetic background noise, even if the signal is intercepted, it is difficult to effectively separate and identify it from environmental noise, achieving signal waveform-level stealth. The transmission power is dynamically adjusted to approach noise levels. The base layer, while ensuring link budget, further reduces the signal power spectral density, increasing detection difficulty. Onboard intelligent processing and routing decisions reduce the signal's dependence on fixed ground control centers, enhancing the system's autonomy and resilience. Each relay forward dynamically transforms and re-encrypts signal parameters, such as carrier frequency and modulation scheme, causing the communication link to exhibit completely different signal characteristics in different segments. This cuts off the enemy's ability to trace the entire communication link by correlating and analyzing signals from different nodes, achieving segmented stealth. By actively emitting noise-like or deceptive cover signals, it creates smoke in the space electromagnetic environment, effectively overwhelming, interfering with, or misleading enemy signal reception and direction-finding equipment. The system provides proactive electromagnetic protection for the actual communication link. The application of the integrated sensing payload enables the transmission of cover signals to be targeted and accurately aimed at the threat direction. While achieving the cover effect, it optimizes its own energy use and reduces unnecessary electromagnetic exposure. After the communication ends, it quickly returns to zero, clears all mission traces, and restores the system state to a silent and dormant state that is difficult to associate with the communication activity that just occurred, avoiding the risk of continuous exposure caused by maintaining the state after communication. The subsequent orbital maneuvers further change the satellite's spatial position, making it difficult for the enemy to accurately locate and continuously track the satellites involved in the communication even if they detect the communication activity, thus maintaining the overall mobility and stealth of the system.

[0020] The invention is further configured such that, in step a, the retracting of the protruding structure of the satellite platform refers to incorporating a large deployable antenna into the satellite body, making the satellite's external outline approximate a polyhedron or a sphere; the orbital maneuver is executed based on a preset random algorithm or real-time threat command, making the satellite's orbital parameters uncertain, and incorporating strong scattering sources such as the large antenna, significantly reducing the satellite's radar cross-section (RCS) and enhancing its stealth performance against radar detection; the approximate polyhedral or spherical shape helps scatter radar waves, further optimizing the stealth effect; the orbital maneuver based on a random algorithm or real-time threat command gives the satellite's orbital altitude non-periodicity and unpredictability, rendering traditional long-term forecasting methods based on orbital mechanics ineffective, and greatly increasing the difficulty for the enemy to monitor, catalog, and track space targets.

[0021] The invention is further configured such that, in step b, the control center, by integrating real-time space threat situation, satellite dynamic ephemeris, and user trajectories, dynamically calculates one or more covert communication paths containing at least one relay satellite; the one-time-use instruction set contains precise spatiotemporal windows and communication parameters, and performs dynamic path planning by integrating multi-source information, which can proactively avoid known or suspected threat areas and improve the survival probability of communication links; planning multiple paths provides routing redundancy for the system, and when the best path is blocked or exposed, it can quickly switch to the backup path, enhancing the robustness and reliability of communication; the one-time instruction set containing precise spatiotemporal windows and communication parameters is the basis for realizing "zero-handshake" burst communication and dynamic signal concealment, ensuring accurate synchronization and parameter consistency between the two communicating parties without public signaling interaction.

[0022] The present invention is further configured such that the one-time instruction set in step c is pre-distributed to relevant user terminals and satellites via an encrypted satellite-to-ground link or a laser inter-satellite link before communication is triggered. By using a highly secure encrypted link, such as a laser inter-satellite link which has natural anti-interception and anti-interference characteristics, the pre-distribution of instructions ensures the security of the core communication plan and prevents the instructions from being leaked during transmission.

[0023] The present invention is further configured such that, in step d, the dynamic generation of the covert waveform is achieved by using digital filtering technology to shape the spectrum of the communication baseband signal into a shape similar to the perceived background noise power spectral density; the transmission power is dynamically adjusted to be close to or slightly higher than the local noise floor. Real-time spectrum shaping using digital filtering technology is a flexible and efficient signal covert means that enables the communication signal to mimic environmental noise in the frequency domain, significantly reducing its spectral anomaly and raising the threshold for identification. Dynamically adjusting the transmission power to be close to the noise floor minimizes the radiation intensity of the signal while ensuring that the signal-to-noise ratio at the receiving end meets the demodulation requirements, achieving the best balance between communication distance and covertness, and achieving the effect of low power spectral density communication.

[0024] The present invention is further configured such that the dynamic transformation in step e includes changing the carrier frequency, modulation method, frame structure, spreading code, frequency hopping pattern, or symbol rate of the signal; the re-encryption is performed using physical layer security coding technology, which performs joint dynamic transformation on communication parameters in multiple dimensions, greatly expanding the variation space of signal features, making it difficult for the enemy to establish an effective signal fingerprint database for pattern recognition and tracking. Even if the parameters of the previous link are deciphered, it is completely ineffective for the next hop link. Re-encryption using physical layer security coding technology not only protects the security of information content, but the encoding process itself, such as encryption using channel features, can also increase the randomness of the signal, thereby enhancing the confidentiality and anti-interception capability of communication from an information theory perspective.

[0025] The invention is further configured such that, in step f, the cover signal is an incoherent noise-like interference signal or a deception signal with characteristics different from the real communication signal; the launch of the cover satellite utilizes an integrated sensing payload to identify the direction of potential threat sources, providing two flexible electromagnetic cover strategies: noise-like interference can effectively raise the noise floor in the potential listening direction, thereby reducing its sensitivity to the real signal; the deception signal with different characteristics can mislead the enemy, causing them to consume resources on the identification and interference of false targets. The application of the integrated sensing payload realizes the integration of perception and interference, enabling the cover operation to be dynamically adjusted based on real-time threat perception, achieving precise and efficient directional cover, and avoiding self-exposure and energy waste caused by blind omnidirectional interference.

[0026] The present invention is further configured such that initiating subsequent orbital maneuvers in step g includes: in normal mode, the satellite uses Hall thrusters to perform slow orbital drift; in emergency mode, the satellite activates a cold gas propulsion system to perform rapid orbital changes, providing two complementary orbital maneuver modes that take into account both long-term stealth and emergency response requirements. In normal mode, the high-efficiency Hall thrusters are used for slow and continuous orbital drift, achieving long-term and unpredictable orbital changes with extremely low fuel consumption, suitable for persistent stealth. In emergency mode, the high-thrust, fast-response cold gas propulsion system can achieve significant orbital changes in a short time, used for emergency escape from threat areas or collision avoidance, improving the satellite's rapid survivability in crisis situations.

[0027] The invention is further configured such that the outer shell surface of the satellite platform is coated with a temperature-controlled coating with low solar absorptivity and low infrared emissivity, and the platform interior employs a distributed heat pipe system for thermal management. The low solar absorptivity coating reduces the solar radiation heat absorbed by the satellite in sunny areas, while the low infrared emissivity coating reduces the infrared energy radiated outward by the satellite in shadow areas or when it is generating heat. The combination of the two effectively suppresses the infrared radiation characteristics of the satellite, enhancing its stealth capability against infrared detection systems. The distributed heat pipe system can efficiently and evenly transfer and dissipate the heat generated by the electronic equipment inside the platform, avoiding the formation of local hot spots, making the temperature distribution on the satellite surface more uniform and stable, and further reducing the risk of being identified and located by infrared remote sensing.

[0028] The present invention is further configured such that, in step g, when forcing the relevant nodes to immediately terminate communication and reset their state, the control center needs to continuously monitor the node status and external threats. If it is determined that the current communication path has been exposed, communication termination and state reset are performed. This introduces an active interruption mechanism based on continuous threat monitoring, enabling the system to not only reset as planned after communication is completed, but also to immediately terminate communication and reset the state if it detects that the link may have been exposed during communication, such as being subjected to high-intensity targeted interference or detecting abnormal direction finding signals. This circuit breaker can minimize the expansion of losses caused by continuous exposure, protect communication nodes and network topology from further detection, and reflects the system's highly adaptive and proactive defense concept.

[0029] The present invention has the following beneficial effects:

[0030] This invention enhances the stealth and survivability of satellite platforms in orbit. By enabling satellites to enter a silent, dormant state and implementing thermal management and shape control, combined with orbital maneuvers without fixed periods, the physical and orbital characteristics of satellites are difficult to observe and predict stably over a long period. Traditional detection and tracking methods based on fixed shapes and periodic orbits become ineffective, and the risk of exposure of space assets is controlled. At the same time, the communication adopts a "zero-handshake" burst access mechanism based on one-time commands, which completely eliminates the public signaling interaction during the link establishment process and compresses communication activities into an extremely short random time window. External systems find it difficult to complete effective interception, location, and identification within a limited time, achieving low-probability interception from the communication initiation stage.

[0031] This invention enhances the anti-interception, anti-interference, and anti-tracking capabilities of communication links in complex electromagnetic environments. The communication signal can be dynamically generated based on the real-time sensed electromagnetic environment, and its waveform characteristics are integrated with local background noise, making the signal difficult to separate and identify from the environmental noise. During transmission, the communication parameters are dynamically changed and re-encrypted each time the signal passes through a relay, causing the entire link to exhibit different signal characteristics in different segments, cutting off the possibility of end-to-end tracking through correlation analysis. In addition, the system has the ability to coordinate electromagnetic cover and quickly reset the state after communication, actively interfere with and mislead detection equipment, and quickly eliminate mission traces and change the trajectory state after communication ends, further protecting the network topology and node security, and achieving full-link concealment of the communication process. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0033] Figure 1 A flowchart illustrating the design methodology for a highly mobile stealth satellite communication system;

[0034] Figure 2 A schematic diagram illustrating satellite stealth and orbital maneuvering in the design methodology of a highly maneuverable stealth satellite communication system;

[0035] Figure 3 Dynamic path planning and command distribution in the design methodology of a highly mobile stealth satellite communication system

[0036] Schematic diagram;

[0037] Figure 4 Dynamic signal generation and transformation in the design methodology of a highly mobile stealth satellite communication system

[0038] Schematic diagram;

[0039] Figure 5 Cooperative cover and emergency maneuver in the design methodology of a highly mobile stealth satellite communication system

[0040] Schematic diagram. Detailed Implementation

[0041] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] Please see Figures 1-5 This invention relates to a design method for a highly mobile stealth satellite communication system, comprising the following steps:

[0043] Step a: System silence latency and state preset: The control center puts the satellite in the space segment into an electromagnetic silence state, the satellite platform initiates surface thermal management and retracts the protruding structure, and at the same time plans and executes orbital maneuvers without a fixed period.

[0044] Step b: Covert communication demand triggering and dynamic path planning: Highly mobile user terminals or mobile gateways send communication requests; the control center calculates the covert communication path and generates a one-time-use instruction set for the nodes on the path;

[0045] Step c: Burst access based on pre-synchronization "zero handshake": The user terminal directly transmits communication signals in a burst mode at the precise time and spatial location specified by the instruction set; the target satellite completes the receiving beam pointing and parameter configuration according to the same instruction set;

[0046] Step d: Generation and transmission of dynamic covert signals: The signal transmitting node senses the characteristics of background electromagnetic noise according to the instruction set, dynamically generates a communication waveform that matches the local background noise, and transmits it.

[0047] Step e: On-board signal processing and intelligent routing: After receiving the signal, the relay satellite performs rapid demodulation and decryption, and selects the next-hop node through the on-board processing unit; before the signal is forwarded, its communication parameters are dynamically transformed and re-encrypted;

[0048] Step f: Coordinated electromagnetic cover and active jamming: At the same time as the communication link is established, the accompanying sensing satellite or a designated cooperative satellite transmits cover signals in the direction of potential eavesdropping and jamming sources;

[0049] Step g: Communication termination and state reset: All nodes participating in the communication immediately terminate signal transmission and clear relevant parameters after data transmission is completed; then the nodes return to a silent state, and the satellite platform initiates subsequent orbital maneuvers.

[0050] Specifically: By employing thermal management and structural integration, the radar cross-section and infrared radiation characteristics of the satellite are reduced, enhancing its physical stealth capabilities; the non-fixed-period orbital maneuvers make it difficult to accurately predict and track the satellite's orbital parameters, such as semi-major axis, inclination, and right ascension of the ascending node, increasing the complexity of space situational awareness and thus improving the platform's on-orbit survivability; dynamic planning of communication paths based on real-time threats avoids the use of fixed, predictable satellite-to-ground or inter-satellite links, significantly increasing the randomness and unpredictability of communication initiation and routing; the use of a one-time command set ensures the uniqueness of the spatiotemporal and signal parameters for each communication, preventing the use of partially detected parameters from predicting and interfering with subsequent communications, effectively... It combats pattern recognition and prediction attacks based on historical data, completely eliminating the public or periodic signaling interactions used for link establishment, synchronization, and maintenance in traditional communication, thus reducing signal exposure time at the source. Burst communication compresses communication activities into extremely short millisecond-level time windows, making it extremely difficult for external detection systems to intercept, locate, identify, and react to signals within a limited time, achieving low-probability interception or low-probability detection at the access point. By dynamically hiding or integrating the time-frequency domain characteristics of communication signals into real-time changing local electromagnetic background noise, even if the signal is intercepted, it is difficult to effectively separate and identify it from environmental noise, achieving signal waveform-level stealth. It also dynamically adjusts the transmission power to near... The noise floor, while ensuring link budget, further reduces the signal power spectral density, increasing detection difficulty. Onboard intelligent processing and routing decisions reduce the signal's dependence on fixed ground control centers, enhancing the system's autonomy and resilience. Each relay relay dynamically transforms and re-encrypts signal parameters, such as carrier frequency and modulation scheme, causing the communication link to exhibit completely different signal characteristics in different segments. This cuts off the enemy's ability to trace the entire communication link by correlating and analyzing signals from different nodes, achieving segmented stealth. By actively emitting noise-like or deceptive cover signals, creating smoke in the space electromagnetic environment, it can effectively overwhelm, interfere with, or mislead the enemy's signal reception and direction finding. The equipment provides active electromagnetic protection for the actual communication link; the application of integrated inductive and synoptic payloads enables the transmission of cover signals to be targeted and accurately aimed at the direction of the threat. While achieving the cover effect, it optimizes its own energy use and reduces unnecessary electromagnetic exposure. After the communication ends, it quickly returns to zero, clears all mission traces, and restores the system state to a silent and dormant state that is difficult to associate with the communication activity that just occurred, avoiding the risk of continuous exposure caused by maintaining the state after communication. The subsequent orbital maneuvers further change the satellite's spatial position, making it difficult for the enemy to accurately locate and continuously track the satellites involved in the communication even if they detect the communication activity, thus maintaining the overall mobility and stealth of the system.

[0051] In step a, the retracted protruding structure of the satellite platform refers to incorporating the large deployable antenna into the satellite body, making the satellite's external outline approximate a polyhedron or sphere; orbital maneuvers are executed based on preset random algorithms or real-time threat commands, making the satellite's orbital parameters uncertain; in step b, the control center integrates real-time space threat situation, satellite dynamic ephemeris, and user trajectories to dynamically calculate one or more covert communication paths containing at least one relay satellite; the one-time use command set contains precise spatiotemporal windows and communication parameters; in step c, the one-time use command set is pre-distributed to relevant user terminals and satellites via encrypted satellite-to-ground links or laser inter-satellite links before communication is triggered; in step d, the dynamic generation of covert waveforms uses digital filtering technology to shape the spectrum of the communication baseband signal into a shape similar to the perceived background noise power spectral density; the transmit power is dynamically adjusted to be close to or slightly higher than the local noise floor; in step e, dynamic transformation... This includes changing the carrier frequency, modulation method, frame structure, spreading code, frequency hopping pattern, or symbol rate of the signal; re-encryption is performed using physical layer security coding technology; in step f, the cover signal is an incoherent noise-like interference signal or a deceptive signal with characteristics different from the real communication signal; launching the cover satellite utilizes a sensor-integrated payload to identify the direction of potential threat sources; step g initiates subsequent orbital maneuvers including: in normal mode, the satellite uses Hall thrusters to perform slow orbital drift; in emergency mode, the satellite activates a cold gas propulsion system for rapid orbital change; the outer shell of the satellite platform is coated with a temperature-controlled coating with low solar absorptivity and low infrared emissivity; the platform's interior uses a distributed heat pipe system for thermal management; in step g, when forcing relevant nodes to immediately terminate communication and reset their status, the control center needs to continuously monitor the node status and external threats; if it is determined that the current communication path has been exposed, then communication termination and status reset are performed.

[0052] Specifically: By incorporating large antennas and other strong scattering sources, the satellite's radar cross-section (RCS) is significantly reduced, enhancing its stealth performance against radar detection; its near-polyhedral or spherical shape helps scatter radar waves, further optimizing stealth; orbital maneuvers based on random algorithms or real-time threat commands endow the satellite's orbital altitude with non-periodicity and unpredictability, rendering traditional long-term prediction methods based on orbital mechanics ineffective, greatly increasing the difficulty for the enemy to monitor, catalog, and track space targets; and dynamic path planning based on multi-source information enables proactive avoidance of known or suspected threats. The system addresses threats to communication areas, increasing the survivability of communication links. Planning multiple paths provides routing redundancy, allowing for rapid switching to backup paths when the optimal path is blocked or exposed, enhancing communication robustness and reliability. A one-time instruction set containing precise spatiotemporal windows and communication parameters forms the basis for achieving "zero-handshake" burst communication and dynamic signal concealment, ensuring precise synchronization and parameter consistency between communicating parties without public signaling interaction. Highly secure encrypted links, such as laser inter-satellite links, possess inherent anti-interception and anti-interference characteristics. Pre-distributing instructions guarantees the security of the core communication plan. To prevent command leakage during transmission, real-time spectrum shaping using digital filtering technology is a flexible and efficient signal concealment method. It enables communication signals to mimic environmental noise in the frequency domain, significantly reducing their spectral anomalies and raising the threshold for identification. Dynamically adjusting the transmission power to be close to the noise floor, while ensuring that the signal-to-noise ratio at the receiving end meets demodulation requirements, minimizes the radiation intensity of the signal, achieving the best balance between communication distance and concealment, and achieving the effect of low-power spectral density communication. Joint dynamic transformation of communication parameters in multiple dimensions greatly expands the variation space of signal characteristics, making it difficult for the enemy to establish an effective signal fingerprint database for pattern recognition and tracking. Even if the parameters of the previous link are deciphered, it is completely ineffective for the next hop link. Re-encryption using physical layer security coding technology not only protects the security of information content, but the coding process itself, such as encryption using channel characteristics, can also increase the randomness of the signal, enhancing the confidentiality and anti-interception capability of communication from an information theory perspective. It provides two flexible electromagnetic cover strategies: noise-like interference can effectively raise the noise floor in potential listening directions, thereby reducing its sensitivity to the detection of real signals.Dissimilar deception signals can mislead the enemy, causing them to expend resources on identifying and jamming false targets. The application of integrated sensing payloads achieves integrated perception and jamming, enabling cover operations to be dynamically adjusted based on real-time threat perception, achieving precise and efficient directional cover, avoiding self-exposure and energy waste caused by blind omnidirectional jamming. It provides two complementary orbital maneuvering modes, balancing long-term concealment and emergency response needs. Under normal conditions, it uses a high-efficiency Hall thruster for slow, continuous orbital drift, achieving long-term, unpredictable orbital changes with extremely low fuel consumption, suitable for persistent stealth. In emergency mode, it uses a high-thrust, fast-response cold gas propulsion system, which can achieve significant orbital changes in a short time for emergency escape from threat areas or collision avoidance, improving the satellite's rapid survivability in crisis situations. The low solar absorptivity coating reduces the solar radiation heat absorbed by the satellite in sunny areas, and the low infrared... The emissivity coating reduces the infrared energy radiated by the satellite in shadowed areas or when it is generating heat. The combination of these two elements effectively suppresses the satellite's infrared radiation characteristics, enhancing its stealth capability against infrared detection systems. The distributed heat pipe system efficiently and evenly transfers and dissipates heat generated by the platform's internal electronic equipment, preventing the formation of localized hotspots. This results in a more uniform and stable temperature distribution on the satellite surface, further reducing the risk of being identified and located by infrared remote sensing. An active interruption mechanism based on continuous threat monitoring is introduced, enabling the system not only to reset as planned after communication is completed, but also to immediately terminate communication and reset its state if it detects potential exposure of the link during communication, such as high-intensity targeted interference or the detection of abnormal direction-finding signals. This circuit breaker minimizes the escalation of losses due to continuous exposure, protecting communication nodes and network topology from further detection, reflecting the system's highly adaptive and proactive defense approach.

[0053] Please see Figures 1-5 Basic Stealth Communication Process

[0054] This embodiment describes the workflow of a highly mobile stealth satellite communication system in a typical intelligence transmission mission. Satellite A, in a stealthy state, has its antenna retracted, its thermal management system activated, and is performing a pre-programmed random orbital drift. When a high-speed stealth reconnaissance aircraft needs to transmit critical data, it sends an encrypted communication request to the ground control center via a secure backup link. The control center, integrating real-time space surveillance network data, dynamic ephemeris data from various satellites, and the reconnaissance aircraft's predicted trajectory, quickly calculates an optimal covert path via satellite A to the mobile gateway station. It then generates a one-time instruction set for the reconnaissance aircraft, satellite A, and the gateway station, containing parameters such as millisecond-level communication time windows, carrier frequency, modulation scheme, and dynamic waveform generation seed. This set is pre-distributed via laser inter-satellite links and encrypted links. At the precise moment specified by the instruction, the reconnaissance aircraft directly bursts the transmission signal in a predetermined airspace. Satellite A, based on the same... Upon receiving a command, the receiving beam is precisely pointed to a predetermined location in advance, and the receiving signal is configured with matching parameters. Satellite A's payload senses the background electromagnetic noise spectrum in that direction in real time. Based on this, it uses digital filtering technology to modulate the data to be forwarded into a highly similar covert waveform. At the same time, the transmission power is dynamically adjusted to be slightly higher than the local noise floor, and then forwarded to the mobile gateway station. Before forwarding, the onboard processor changes the carrier frequency and frequency hopping pattern of the signal and re-encrypts it using physical layer security coding. Meanwhile, a sensing satellite flying in a nearby orbit transmits an incoherent noise-like masking signal based on the direction of a potential ground reconnaissance station detected by its payload. After the data transmission is completed, the reconnaissance aircraft, Satellite A, and the gateway station immediately stop transmitting, clear all mission-related buffers and parameters, and Satellite A then activates its cold gas thrusters to perform a pre-set rapid orbit change. All nodes return to a silent and dormant state.

[0055] Please see Figures 2-5 Multi-user burst access and coordination

[0056] This embodiment demonstrates the system's ability to coordinate multiple highly mobile user terminals for covert access simultaneously in a war zone environment. During a multi-unit coordinated operation, three stealth communication vehicles and two UAVs, dispersed across a vast area, almost simultaneously generated communication requests. Upon receiving these requests, the ground control center's intelligent planning algorithm not only calculated independent communication paths for each user via different relay satellites but also meticulously arranged the communication time windows for each path, ensuring staggered distribution in time and space to avoid signal superposition and the formation of abnormal energy peaks in a specific location. A unique one-time instruction set was generated for each user and its corresponding path node. At different specified times, these user terminals sequentially, on their respective high-speed mobility routes, received the instructions. The system transmits signals at precise locations in extremely short bursts. The target relay satellite synchronously adjusts its beam according to the corresponding instructions to complete "zero-handshake" access. The waveform of each user signal is dynamically generated based on the local real-time electromagnetic environment at the time of transmission, resulting in different shapes. After processing each signal, the onboard processing unit directs it to different next-hop satellites or gateways according to the dynamic routing table. Before forwarding, the modulation method and encryption key of each signal are independently transformed. Through this highly coordinated and discrete access and routing mechanism, the system successfully dilutes and disguises the concurrent communication activities of multiple users in multiple dimensions such as time, space, frequency, and waveform, greatly increasing the difficulty for the enemy to conduct overall situational awareness and correlation analysis.

[0057] Please see Figures 1-4 Inter-satellite cooperative perception and maneuver evasion

[0058] This embodiment focuses on the physical concealment and collaborative survival strategies of the satellite platform during non-communication phases. During the normal latency period, a stealth constellation consisting of several satellites operates in low Earth orbit. The outer shell is coated with a special temperature-controlled coating, and internal heat is evenly dissipated through distributed heat pipes, resulting in a uniform low-infrared signature on the satellite surface, maintaining electromagnetic silence. Large antennas are retracted. Satellites within the constellation share information about the surrounding space situation, perceived by their respective miniature optical or passive radio frequency sensors, via low-probability-of-interception laser inter-satellite links. This information includes the location of potential threat spacecraft and illumination by large ground-based radars. Based on the shared threat map and a pre-set random maneuvering algorithm, each satellite, under the macro-guidance of the control center, autonomously makes decisions and... By activating its Hall thrusters, the satellite performs slow, continuous, and irregular orbital drift or fine-tuning of orbital altitude, keeping the configuration of the entire constellation in a state of slow, unpredictable change. When a satellite, through a collaborative sensing network, predicts that it is about to enter the key surveillance arc of a known ground-based anti-satellite radar, it can activate its cold gas thrusters in advance to perform a rapid, small-amplitude orbital maneuver to deviate from the original predicted trajectory and avoid the risk of being continuously tracked and locked. This mode, which combines platform physical stealth, distributed collaborative sensing, and intelligent autonomous maneuvering, allows the entire satellite system to remain hidden in the background of space as an fuzzy entity that is difficult to detect, track, and predict even when not communicating.

[0059] Please see Figures 1-5 Long-distance stealth relay transmission

[0060] This embodiment illustrates the mechanism by which the system achieves end-to-end covert transmission in beyond-line-of-sight or cross-regional communication. When a deep-sea submersible platform needs to establish communication with a local command center, but there is no direct line-of-sight link between them and the distance is vast, the system initiates multi-hop covert relay. The control center plans a path that requires relay transmission via three relay satellites (Sat1, Sat2, Sat3). The one-time command set not only specifies the end-to-end timing of the entire link, but also specifies the timing for each inter-satellite link segment (platform->Sat1, Sat1->Sat2, Sat2->Sat3). Each of the four links (Sat3 to the command center) is assigned an independent and dynamically changing set of communication parameters. The stealthy platform first sends data to Sat1 in a covert burst mode. After receiving and demodulating the data, Sat1 changes the carrier frequency from the value of the first link to a completely different frequency before forwarding it to Sat2. At the same time, it changes the modulation method and spreading code, and re-encrypts and encapsulates the data using a new physical layer key. Sat2 and Sat3 perform similar operations in sequence. Each hop causes a sudden change in the signal characteristics. In addition, during the activation of the link from Sat1 to Sat2, a designated cover satellite transmits a deceptive signal with different characteristics towards the potential space-based detectors in the link area. After three such reception, transformation or encryption and forwarding processes, the signal finally reaches the command center. To any external observer, these four links look like isolated signal events with different characteristics, and cannot be linked together into a complete communication link through signal correlation. This achieves segmented stealth in the long-distance transmission of information.

[0061] The preferred embodiments of the present invention disclosed above are only for the purpose of illustrating the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation described herein. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention.

Claims

1. A design method for a highly mobile stealth satellite communication system, characterized in that: Includes the following steps: Step a: System silence latency and state preset: The control center puts the satellite in the space segment into an electromagnetic silence state, the satellite platform initiates surface thermal management and retracts the protruding structure, and at the same time plans and executes orbital maneuvers without a fixed period. Step b: Covert communication demand triggering and dynamic path planning: Highly mobile user terminals or mobile gateways send communication requests; the control center calculates the covert communication path and generates a one-time-use instruction set for the nodes on the path; Step c: Burst access based on pre-synchronization "zero handshake": The user terminal directly transmits communication signals in a burst mode at the precise time and spatial location specified by the instruction set; the target satellite completes the receiving beam pointing and parameter configuration according to the same instruction set; Step d: Generation and transmission of dynamic covert signals: The signal transmitting node senses the characteristics of background electromagnetic noise according to the instruction set, dynamically generates a communication waveform that matches the local background noise, and transmits it. Step e: On-board signal processing and intelligent routing: After receiving the signal, the relay satellite performs rapid demodulation and decryption, and selects the next-hop node through the on-board processing unit; before the signal is forwarded, its communication parameters are dynamically transformed and re-encrypted; Step f: Coordinated electromagnetic cover and active jamming: At the same time as the communication link is established, the accompanying sensing satellite or a designated cooperative satellite transmits cover signals in the direction of potential eavesdropping and jamming sources; Step g: Communication termination and state reset: All nodes participating in the communication immediately terminate signal transmission and clear relevant parameters after data transmission is completed; then the nodes return to a silent state, and the satellite platform initiates subsequent orbital maneuvers.

2. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: In step a, the retractable structure of the satellite platform refers to retracting the large deployable antenna into the satellite body, making the satellite's external outline approximate a polyhedron or a sphere; the orbital maneuver is executed based on a preset random algorithm or real-time threat commands, making the satellite's orbital parameters uncertain.

3. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: In step b, the control center integrates real-time space threat situation, satellite dynamic ephemeris and user trajectory to dynamically calculate one or more covert communication paths containing at least one relay satellite; the one-time use instruction set contains precise spatiotemporal windows and communication parameters.

4. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: The one-time instruction set in step c is pre-distributed to relevant user terminals and satellites via encrypted satellite-to-ground links or laser inter-satellite links before communication is triggered.

5. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: In step d, the dynamic generation of the covert waveform is achieved by using digital filtering technology to shape the spectrum of the communication baseband signal into a shape similar to the perceived background noise power spectral density; the transmission power is dynamically adjusted to be close to or slightly higher than the local noise floor.

6. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: The dynamic transformation in step e includes changing the carrier frequency, modulation method, frame structure, spreading code, frequency hopping pattern, or symbol rate of the signal; the re-encryption is performed using physical layer security coding technology.

7. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: In step f, the cover signal is an incoherent noise-like interference signal or a deceptive signal that differs from the characteristics of a real communication signal; the launch of the cover satellite utilizes an integrated sensing payload to identify the direction of potential threat sources.

8. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: Step g, initiating subsequent orbital maneuvers, includes: in normal mode, the satellite uses Hall thrusters to perform slow orbital drift; in emergency mode, the satellite activates the cold gas propulsion system to perform rapid orbital changes.

9. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: The satellite platform's outer shell is coated with a temperature-controlled coating that has low solar absorptivity and low infrared emissivity, and the platform's interior uses a distributed heat pipe system for thermal management.

10. The design method of a highly mobile stealth satellite communication system according to claim 1, characterized in that: When step g forces the relevant nodes to immediately terminate communication and reset their status, the control center needs to continuously monitor the node status and external threats. If it is determined that the current communication path has been exposed, then communication termination and status reset will be performed.

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