A frequency division mixing-based BeiDou and mobile communication fusion positioning system

Abstract

This invention relates to a BeiDou and mobile communication fusion positioning system based on frequency division mixing (FDM), belonging to the field of BeiDou positioning and mobile communication fusion technology. The system includes a BeiDou multi-channel signal generation unit, a signal combining unit, a mobile communication transmission unit, and a BeiDou signal conversion unit, with each unit operating sequentially. The BeiDou multi-channel signal generation unit generates BeiDou frequency domain diversity combined signals or BeiDou time-division frequency domain diversity signals based on the frequency division isolation principle. The signal combining unit preprocesses and combines or directly transmits the signals. The mobile communication transmission unit enables the shared network transmission of BeiDou signals and mobile communication signals. The BeiDou signal conversion unit generates BeiDou positioning signals through filtering, mixing, and other processing. This invention relies on the core technology of frequency division mixing to enable BeiDou signals to share the transmission network with existing indoor communication distribution systems, adapting to enclosed scenarios such as parking lots, utility tunnels, and underground tunnels. It features a simple structure, strong coordination, and allows for seamless terminal access for positioning and navigation.

Description

Technical Field

[0001] This invention belongs to the field of BeiDou positioning and mobile communication fusion technology, specifically relating to a BeiDou and mobile communication fusion positioning system based on frequency division mixing. Background Technology

[0002] With the rapid development of mobile communication technology and BeiDou positioning technology, the intelligent upgrading of enclosed scenarios such as underground parking lots, urban integrated pipe corridors, long-distance tunnels, and large underground shopping malls is accelerating, making the demand for integrated 5G communication and BeiDou high-precision positioning services increasingly urgent. In such enclosed scenarios, BeiDou satellite signals are severely attenuated due to obstacles such as walls, rock strata, and reinforced concrete, making it impossible for traditional BeiDou positioning systems to achieve effective coverage, resulting in terminals being unable to obtain positioning information. While existing indoor distributed antenna systems (such as 4G / 5G indoor distributed antenna systems) have achieved full coverage in such enclosed scenarios, their core function is to transmit, amplify, and radiate mobile communication signals. However, their transmission networks (including RF cables, distributed antennas, couplers, power dividers, etc.) are designed for the frequency band characteristics of mobile communication signals, with single frequency band adaptation. They can only efficiently transmit mobile communication signals and cannot be compatible with the frequency band and signal form of BeiDou positioning signals, making it difficult to achieve coordinated transmission of BeiDou signals and mobile communication signals.

[0003] Currently, for positioning and communication needs in closed environments, the industry mainly adopts the model of "separate deployment of the BeiDou system + independent operation of the communication system." This means that the BeiDou positioning system needs to be deployed separately with dedicated BeiDou transponders, dedicated transmission links, and dedicated radiating antennas. This not only requires a significant additional investment in equipment procurement and construction and installation costs, but also occupies limited installation space in closed environments, increasing the difficulty of system deployment and the workload of subsequent maintenance. At the same time, because the frequency bands of BeiDou signals and mobile communication signals are similar, the two are prone to signal spectrum crossing and mutual interference when deployed independently. Interference signals can lead to a significant decrease in BeiDou positioning accuracy and frequent loss of positioning data, while also affecting the transmission stability of mobile communication signals, resulting in call interruptions, reduced data transmission rates, and other phenomena, seriously affecting the integrated service experience.

[0004] Existing solutions for integrating BeiDou and mobile communication suffer from poor adaptability and low signal processing efficiency, lacking efficient signal processing mechanisms for closed scenarios. In the generation stage of multiple BeiDou signals, most solutions do not employ scientific frequency domain planning mechanisms, simply dividing frequency intervals, which easily leads to frequency overlap and interference between multiple BeiDou signals, resulting in signal spectrum distortion. During signal combining, preprocessing is lacking or the process is unreasonable, failing to adequately filter, adjust amplitude, and calibrate the signals, resulting in insufficient phase synchronization accuracy during combining and uneven signal amplitude after combining, easily leading to signal distortion. In the signal conversion stage, the mixing mechanism is imperfect, unable to accurately separate and restore the original BeiDou positioning signal, resulting in positioning accuracy that fails to meet practical application requirements. Meanwhile, most integration solutions fail to achieve seamless sharing between BeiDou signals and existing indoor communication distribution systems. They either require large-scale modifications to the hardware and transmission links of existing systems, resulting in long cycles, high costs, and potential disruption to existing communication services; or they employ simple signal superposition for shared network transmission, leading to low BeiDou signal transmission efficiency and severe signal attenuation, making it difficult to meet the seamless access positioning and navigation needs of various terminals such as smartphones, vehicle terminals, wearable devices, and underground operation terminals. Furthermore, existing multi-channel BeiDou signal generation often employs a single simultaneous generation mode. This mode requires additional deployment of multiplexers, combiners, and other auxiliary equipment to merge and transmit multiple signals, further increasing system complexity and equipment costs. It also cannot flexibly adjust the signal generation mode according to the scale of the closed scenario and the number of terminals accessed, resulting in poor adaptability and difficulty in meeting the application needs of closed scenarios of different scales and terminal densities. Additionally, existing integration solutions suffer from insufficient impedance matching accuracy and poor frequency domain isolation during signal transmission, further exacerbating mutual interference between the two types of signals and affecting the overall stability of the system. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this invention provides a BeiDou and mobile communication fusion positioning system based on frequency division mixing. The objective of this invention can be achieved through the following technical solutions: A BeiDou and mobile communication fusion positioning system based on frequency division mixing includes a BeiDou multi-channel signal generation unit, a signal combining unit, a mobile communication transmission unit, and a BeiDou signal conversion unit; The BeiDou multi-channel signal generation unit scans the BeiDou signal frequency band, divides the frequency interval, and generates a planned frequency domain; it receives the original BeiDou positioning signal, maps it to the planned frequency domain, and splits it through frequency division processing to generate an initial BeiDou frequency domain point frequency signal based on a preset frequency difference, forming a BeiDou frequency domain diversity combination signal; in time-division mode, it allocates signal time slots and outputs a BeiDou time-division frequency domain diversity signal. The signal combining unit receives the BeiDou frequency domain diversity combined signal, performs signal filtering, amplitude adjustment and phase calibration preprocessing, extracts signal frequency features and performs combining in frequency domain order, adjusts signal amplitude, completes phase synchronization operation, and generates BeiDou frequency domain combined cooperative signal set; it also receives the BeiDou time-division frequency domain diversity signal, determines the signal timing, does not perform combining processing, and adjusts signal amplitude. The mobile communication transmission unit is based on the communication and navigation collaborative network transmission network. It adjusts the impedance of the BeiDou frequency domain combined collaborative signal set or the BeiDou time-division frequency domain diversity signal to isolate it from the mobile communication signal in the frequency domain. After power amplification and filtering out noise, it generates the BeiDou network radiation signal through the transmission link. The BeiDou signal conversion unit accesses the BeiDou network radiation signal, splits the BeiDou frequency domain point frequency signal based on the preset frequency domain, performs frequency difference calculation to generate radio frequency combined signal, filters out harmonic noise, and generates BeiDou positioning signal after signal shaping and timing calibration.

[0006] Specifically, the process of scanning the BeiDou positioning signal frequency band includes: comprehensively scanning the working frequency band of the BeiDou positioning system, capturing the spectral characteristics of all signals within the working frequency band, and determining the BeiDou positioning signal and interference signal through spectral feature comparison; marking the spectral characteristics of the interference signal, delineating the interference-free signal frequency band as the usable frequency band, and simultaneously marking the spectral range of the interference frequency band.

[0007] Specifically, the process of dividing the frequency intervals includes: retrieving the scanned and stored frequency bands and marked interference frequency bands; firstly removing the interference frequency bands from the overall frequency bands; dividing the interference-free frequency bands into frequency intervals of uniform width; during the division process, detecting the spectral boundaries of adjacent intervals in real time; reserving fixed interval frequency bands for adjacent frequency intervals; after the division is completed, performing spectral calibration on each frequency interval; and recording and archiving the spectral parameters of the frequency intervals.

[0008] Specifically, the process of generating the initial BeiDou frequency domain point frequency signal through frequency division processing includes: accessing the original BeiDou positioning signal, performing spectrum preprocessing to remove redundant clutter, and calibrating the spectrum amplitude of the preprocessed signal; mapping the calibrated BeiDou signal to each planned and archived frequency interval, performing frequency division processing on the BeiDou signal mapped to each frequency interval, splitting the BeiDou signal of a single frequency band into two point frequency signals, calibrating the frequency difference within a preset frequency difference range based on the frequency data of the two point frequency signals, adjusting the amplitude of the two point frequency signals to be consistent, generating the initial BeiDou frequency domain point frequency signal, and recording the frequency and amplitude parameters of the initial BeiDou frequency domain point frequency signal.

[0009] Specifically, the process of allocating signal time slots in the time-division mode includes: retrieving the BeiDou frequency domain diversity combination signal and its corresponding spectral parameters, sorting them according to the generation time order, allocating an independent signal time slot for each sorted BeiDou frequency domain diversity combination signal, and marking each signal time slot with a time slot identifier; associating and storing the time slot identifier with the spectral parameters of the corresponding BeiDou frequency domain diversity combination signal, fixing the time slot duration and time slot interval; calibrating the boundaries of adjacent time slots, and retrieving the BeiDou frequency domain diversity combination signal one by one according to the order corresponding to the time slot identifier to generate the BeiDou time-division frequency domain diversity signal.

[0010] Specifically, the signal filtering process includes: performing preliminary spectrum detection on the BeiDou frequency domain diversity combined signal, recording the spectrum distribution range, connecting the BeiDou frequency domain diversity combined signal to a preset filtering link, performing spectrum filtering, and retaining valid signals.

[0011] Specifically, the process of extracting signal frequency features and performing combining includes: performing spectrum analysis on the BeiDou frequency domain diversity combined signal, extracting the core parameters of the BeiDou signal in each frequency interval, including center frequency, signal amplitude and phase information; classifying, recording and verifying the core parameters, eliminating abnormal parameter data, sorting the core parameters of all frequency intervals based on the natural order of the center frequency, and connecting the BeiDou signals of each frequency interval to the combining link in sequence according to the sorting result, thereby integrating and generating the BeiDou frequency domain combining cooperative signal set.

[0012] Specifically, the phase synchronization operation includes: acquiring phase information of each BeiDou signal in real time, comparing the phase deviation between different BeiDou signals, and calculating the deviation value with the reference phase; adjusting the phase deviation based on a preset synchronization threshold, providing real-time feedback of phase deviation data during the adjustment process, and continuously calibrating until the phase deviation of all signals is reduced to within the preset synchronization threshold range.

[0013] Specifically, the process of adjusting the impedance of the BeiDou frequency domain combined cooperative signal set or the BeiDou time-division frequency domain diversity signal includes: performing preliminary impedance detection on the BeiDou frequency domain combined cooperative signal set or the BeiDou time-division frequency domain diversity signal, collecting output impedance data, detecting the characteristic impedance of the communication and navigation cooperative network in real time, obtaining the characteristic impedance data of the communication and navigation cooperative network, calculating the impedance deviation value, and dynamically adjusting the output impedance parameters according to the impedance deviation value.

[0014] Specifically, the frequency domain isolation process includes: performing spectrum analysis on the BeiDou frequency domain combined signal set or the BeiDou time-division frequency domain diversity signal and the mobile communication signal to obtain the spectral characteristics and frequency range of the two types of signals; determining the passband and stopband parameters of the filter based on the frequency difference between the two types of signals, and isolating the frequency domain of the two types of signals through filtering.

[0015] Specifically, the process of extracting BeiDou frequency domain point frequency signals based on a preset frequency domain includes: removing external noise mixed in during the transmission of the BeiDou shared network radiated signal, obtaining spectrum data, retrieving preset frequency parameters of the initial BeiDou frequency domain point frequency signal, and generating a filtering range; connecting the BeiDou shared network radiated signal to the filtering link, filtering signals that match the preset frequency parameters, and gradually extracting two BeiDou frequency domain point frequency signals corresponding to each group of BeiDou frequency domain diversity combination signals; obtaining the frequency data of the BeiDou frequency domain point frequency signals and comparing them with the frequency parameters of the initial BeiDou frequency domain point frequency signals.

[0016] Specifically, the process of generating the radio frequency combined signal by performing frequency difference calculation includes: performing spectrum calibration on the BeiDou frequency domain point frequency signals respectively, obtaining the calibrated frequency data, starting the passive mixing operation mechanism, retrieving the preset frequency difference of the initial BeiDou frequency domain point frequency signals, performing subtraction operation on the two split BeiDou frequency domain point frequency signals, eliminating the instantaneous noise signals generated during the operation, performing spectrum shaping on the obtained signal, adjusting the spectrum shape of the signal, and generating the radio frequency combined signal.

[0017] The beneficial effects of this invention are as follows: This invention relies on frequency division mixing core technology to allow BeiDou signals and mobile communication signals to share the transmission network of the existing indoor communication distribution system. There is no need to deploy a separate BeiDou dedicated transmission link and radiation equipment, which reduces the system construction cost and deployment difficulty. It does not require large-scale transformation of the existing indoor communication distribution system, has strong compatibility, and can be quickly adapted to the application needs of closed scenarios such as parking lots, utility tunnels, and tunnels.

[0018] The BeiDou multi-channel signal generation unit divides frequency intervals based on the frequency division isolation principle. It generates initial BeiDou frequency domain point frequency signals with preset frequency differences through frequency division processing, avoiding frequency overlap interference between multiple BeiDou signals. It also supports two modes: simultaneous generation and time-division generation. In time-division mode, multiple signals can be reused without deploying multiplexers, combiners, or other equipment, simplifying the system structure. It can be flexibly switched according to actual scenario requirements and adapted to indoor distribution systems of different scales.

[0019] The signal combining unit performs filtering, amplitude adjustment, and phase calibration preprocessing on the BeiDou frequency domain diversity combined signal before performing combining and phase synchronization operations. This ensures that the combined BeiDou frequency domain combined collaborative signal set has balanced amplitude and synchronized phase, avoiding signal distortion during the combining process. For the BeiDou time-division frequency domain diversity signal, no combining processing is performed, only amplitude adjustment is performed, further improving signal transmission efficiency and stability.

[0020] The mobile communication transmission unit achieves independent and stable transmission of BeiDou signals and mobile communication signals through impedance adjustment and frequency domain isolation, avoiding mutual interference between the two types of signals. At the same time, through power amplification and clutter filtering, it reduces signal loss and clutter effects during signal transmission, ensuring the integrity and reliability of BeiDou signal transmission.

[0021] The BeiDou signal conversion unit accurately decomposes the BeiDou frequency domain point frequency signal through frequency domain gating and filtering, and generates a radio frequency combined signal by frequency difference calculation in combination with passive mixing. After clutter filtering, signal shaping and timing calibration, the BeiDou positioning signal can be restored to ensure positioning accuracy and meet the seamless access positioning and navigation needs of various terminals such as smartphones, vehicle terminals, and wearable devices. Attached Figure Description

[0022] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is an overall architecture diagram of a BeiDou and mobile communication fusion positioning system based on frequency division mixing according to the present invention; Figure 2 This is a flowchart of the signal processing in this invention. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0025] Please see Figures 1-2 A BeiDou and mobile communication fusion positioning system based on frequency division mixing includes a BeiDou multi-channel signal generation unit, a signal combining unit, a mobile communication transmission unit, and a BeiDou signal conversion unit. The BeiDou multi-channel signal generation unit scans the BeiDou signal frequency band, divides the frequency interval, and generates a planned frequency domain; it receives the original BeiDou positioning signal, maps it to the planned frequency domain, and splits it through frequency division processing to generate an initial BeiDou frequency domain point frequency signal based on a preset frequency difference, forming a BeiDou frequency domain diversity combination signal; in time-division mode, it allocates signal time slots and outputs a BeiDou time-division frequency domain diversity signal. The signal combining unit receives the BeiDou frequency domain diversity combined signal, performs signal filtering, amplitude adjustment and phase calibration preprocessing, extracts signal frequency features and performs combining in frequency domain order, adjusts signal amplitude, completes phase synchronization operation, and generates BeiDou frequency domain combined cooperative signal set; it also receives the BeiDou time-division frequency domain diversity signal, determines the signal timing, does not perform combining processing, and adjusts signal amplitude. The mobile communication transmission unit is based on the communication and navigation collaborative network transmission network. It adjusts the impedance of the BeiDou frequency domain combined collaborative signal set or the BeiDou time-division frequency domain diversity signal to isolate it from the mobile communication signal in the frequency domain. After power amplification and filtering out noise, it generates the BeiDou network radiation signal through the transmission link. The BeiDou signal conversion unit accesses the BeiDou network radiation signal, splits the BeiDou frequency domain point frequency signal based on the preset frequency domain, performs frequency difference calculation to generate radio frequency combined signal, filters out harmonic noise, and generates BeiDou positioning signal after signal shaping and timing calibration.

[0026] Specifically, the process of scanning the BeiDou positioning signal frequency band includes: activating the spectrum sensing algorithm to conduct a comprehensive scan of all working frequency bands of the BeiDou positioning system; capturing the spectral characteristics of all signals within the frequency band in real time during the scan; distinguishing BeiDou positioning signals from external interference signals through spectral feature comparison; marking the spectral characteristics of the identified interference signals; recording the start and end range of the interference signal's spectrum; simultaneously delineating the interference-free signal frequency band; synchronously marking the specific spectral range of the interference frequency band; and classifying and storing the spectral information of the delineated frequency band and the interference frequency band.

[0027] Specifically, the process of dividing the frequency range includes: retrieving the frequency band and marked interference frequency band data stored in the previous scan; firstly removing the interference frequency band from the overall frequency band, retaining only the interference-free frequency band for subsequent processing; adopting an equal frequency domain division mechanism to divide the frequency band into multiple frequency ranges of equal width; during the division process, detecting the spectral boundaries of adjacent ranges in real time, reserving fixed interval frequency bands for adjacent frequency ranges; after the division is completed, performing spectrum calibration on each frequency range, checking the start and end ranges of the spectrum of each range one by one, confirming that there is no spectrum intersection or overlap between the ranges, and recording and archiving the spectral parameters of each frequency range.

[0028] Specifically, the process of generating the initial BeiDou frequency domain point frequency signal through frequency division processing includes: accessing the original BeiDou positioning signal, performing spectrum preprocessing on the signal, using a basic filtering algorithm to remove redundant clutter from the signal, calibrating the spectrum amplitude of the preprocessed signal to keep the signal amplitude stable, and then using frequency domain mapping technology to accurately map the calibrated original BeiDou positioning signal to each frequency interval that has been planned and archived in the early stage. After the mapping is completed, the orthogonal frequency division algorithm is started to perform frequency division processing on the BeiDou signal mapped to each frequency interval separately, splitting the BeiDou signal of a single frequency band into two frequency-stable point frequency signals. During the splitting process, the frequency data of the two point frequency signals are collected in real time, and the frequency difference between the two is calibrated to keep the difference within the preset frequency difference range. At the same time, the amplitude of the two point frequency signals is adjusted, and the amplitude of the two is kept basically consistent through the amplitude feedback adjustment mechanism. After the adjustment is completed, the initial BeiDou frequency domain point frequency signal is generated, and the frequency and amplitude parameters of the point frequency signal are recorded.

[0029] Specifically, the process of allocating signal time slots in the time-division mode includes: after switching to the time-division generation mode, starting the time-division multiple access scheduling algorithm, retrieving all previously generated BeiDou frequency domain diversity combination signals and their corresponding spectral parameters, sorting them according to the generation time order of each combination signal, allocating an independent signal time slot for each sorted combination signal, marking each time slot with a unique time slot identifier during the allocation process, associating and storing the time slot identifier with the spectral parameters of the corresponding combination signal, fixing the time slot duration and time slot interval, calibrating the boundaries of adjacent time slots to ensure that adjacent signal time slots do not overlap or have gaps, and after the allocation is completed, retrieving each BeiDou frequency domain diversity combination signal one by one according to the order corresponding to the time slot identifier, and outputting them sequentially to form BeiDou time-division frequency domain diversity signals for the signal combining unit to receive and process.

[0030] Specifically, the signal filtering process includes: first, receiving the BeiDou frequency domain diversity combined signal transmitted by the BeiDou multi-channel signal generation unit; performing preliminary spectrum detection on the combined signal and recording the signal's spectrum distribution range; starting the filtering algorithm; connecting the combined signal to a preset filtering link; performing spectrum filtering on the signal through the filtering algorithm; retaining the effective BeiDou signal in the signal and filtering out external noise signals in the signal; monitoring the spectrum changes of the signal in real time during the filtering process; collecting signal spectrum data before and after filtering; comparing and analyzing the filtering effect; and after filtering is completed, performing preliminary amplitude detection on the signal, collecting signal amplitude data, and comparing it with the amplitude data before filtering.

[0031] Specifically, the process of extracting signal frequency features and performing combining includes: first, receiving the BeiDou frequency domain diversity combined signal transmitted by the BeiDou multi-channel signal generation unit; performing signal filtering, amplitude adjustment, and phase calibration preprocessing on the combined signal in sequence; after preprocessing, starting the Fast Fourier Transform algorithm to perform comprehensive spectrum analysis on the preprocessed BeiDou frequency domain diversity combined signal; extracting the core parameters of the BeiDou signal in each frequency interval, including center frequency, signal amplitude, and phase information; classifying, recording, and verifying the extracted core parameters; removing abnormal parameter data; sorting the core parameters of all frequency intervals according to the natural order of center frequency; and sequentially connecting the BeiDou signals of each frequency interval to the combining link according to the sorting result. During the combining process, the amplitude of each signal is adjusted in real time, and the amplitude of each signal is gradually calibrated through the amplitude adjustment module to keep the amplitude of each signal balanced. At the same time, the phase of each signal is calibrated to eliminate phase deviation between signals, and multiple sets of BeiDou signals are gradually integrated to form a BeiDou frequency domain combined cooperative signal set.

[0032] Specifically, the phase synchronization operation includes the following steps: First, receiving the BeiDou frequency domain diversity combined signal, performing signal filtering, amplitude adjustment, and phase calibration preprocessing on the combined signal in sequence, then initiating the integration operation of multiple BeiDou signals. During the integration process, a phase-locked loop synchronization mechanism is simultaneously activated. The phase information of each BeiDou signal is captured in real time through a phase detector, the phase data of each signal is collected and recorded, the phase deviation between different signals is compared, the deviation value between each signal and the reference phase is calculated, and the detected phase deviation data is transmitted to the phase adjustment module. The phase adjustment module performs phase fine adjustment on signals with large phase deviations according to a preset synchronization threshold, gradually reducing the phase deviation between each signal. During the adjustment process, the phase deviation data is fed back in real time, and continuous calibration is performed until the phase deviation of all signals is reduced to within the preset synchronization threshold range, thus completing the phase synchronization operation.

[0033] Specifically, the process of adjusting the impedance of the BeiDou frequency domain combined signal set or the BeiDou time-division frequency domain diversity signal includes: accessing the BeiDou frequency domain combined signal set or BeiDou time-division frequency domain diversity signal transmitted by the signal combining unit; performing preliminary impedance detection on the corresponding access signal; collecting the output impedance data of the current access signal; starting the adaptive impedance matching algorithm; detecting the characteristic impedance of the communication and conduction collaborative network transmission network in real time; synchronously collecting the characteristic impedance data of the transmission network; importing the impedance data of both into the algorithm model for comparative analysis; calculating the impedance deviation value; dynamically adjusting the output impedance parameters of the access signal according to the deviation value; continuously monitoring impedance changes during the adjustment process; collecting the adjusted output impedance data in real time; repeatedly comparing it with the characteristic impedance data of the transmission network; gradually reducing the impedance deviation until the output impedance of the access signal and the characteristic impedance of the transmission network tend to be consistent.

[0034] Specifically, the frequency domain isolation process includes: first, completing the impedance adjustment of the BeiDou frequency domain combining and coordinating signal set or the BeiDou time-division frequency domain diversity signal; then, connecting the adjusted BeiDou signal and the mobile communication signal respectively; performing spectrum analysis on the two types of signals, collecting and recording the spectrum characteristics and frequency ranges of the two types of signals, clarifying the frequency range differences between the two types of signals; activating the frequency domain isolation filtering mechanism; setting the passband and stopband parameters of the filter according to the frequency differences between the two types of signals, so that the filter passband matches the frequency range of the BeiDou signal, allowing only the BeiDou signal to pass through; matching the filter stopband matches the frequency range of the mobile communication signal, allowing only the mobile communication signal to pass through; connecting the two types of signals to the set filter simultaneously; achieving frequency domain separation of the two types of signals through filtering; detecting the spectrum distribution of the two types of signals in real time during the isolation process, collecting spectrum data, and checking the spectrum crossover of the two types of signals.

[0035] Specifically, the process of extracting BeiDou frequency domain point frequency signals based on a preset frequency domain includes: accessing the BeiDou shared network radiation signal transmitted by the mobile communication transmission unit, performing preliminary spectrum sorting on the signal, using a basic filtering algorithm to remove external noise mixed in during transmission, collecting the sorted signal spectrum data, starting a frequency domain gating filtering algorithm, retrieving the preset frequency parameters of the initial BeiDou frequency domain point frequency signal recorded earlier, setting the filtering range according to the parameters, connecting the sorted BeiDou shared network radiation signal to the set filtering link, selectively filtering out signals that match the preset frequency parameters through the filtering algorithm, gradually separating the two BeiDou frequency domain point frequency signals corresponding to each group of BeiDou frequency domain diversity combination signals, calibrating the frequency parameters of the point frequency signals in real time during the separation process, collecting the frequency data of the separated point frequency signals, comparing them with the frequency parameters of the initial BeiDou frequency domain point frequency signals to ensure that the frequency characteristics of the separated point frequency signals are consistent with those of the initial BeiDou frequency domain point frequency signals.

[0036] Specifically, the process of generating a radio frequency combined signal by performing frequency difference calculation includes: acquiring two split BeiDou frequency domain point frequency signals, performing spectrum calibration on the two point frequency signals respectively, collecting the calibrated frequency data to ensure that the frequencies of the two signals remain stable, starting a passive mixing operation mechanism, retrieving the preset frequency difference parameters of the initial BeiDou frequency domain point frequency signals that were previously set and recorded, performing a subtraction operation on the two split BeiDou frequency domain point frequency signals based on the preset frequency difference, monitoring the spectrum changes of the operation results in real time during the operation, collecting the spectrum data during the operation, removing the instantaneous noise signals generated during the operation, performing spectrum shaping on the obtained signal, adjusting the spectrum shape of the signal to keep the signal frequency stable, generating a radio frequency combined signal, and collecting and recording the spectrum parameters of the radio frequency combined signal.

[0037] This embodiment uses a multi-antenna communication indoor distribution system in a closed scenario as the application carrier. The communication indoor distribution system includes N radiating antennas (N is a positive integer). Each unit works together to realize the co-network transmission of Beidou signals and mobile communication signals and the restoration of positioning signals. Frequency division mixing core technology is used throughout the process.

[0038] 1. Implementation process of the BeiDou multi-channel signal generation unit This unit, based on the frequency division isolation principle and combined with multi-channel signal generation logic, realizes the generation of BeiDou frequency domain diversity combined signals and BeiDou time-division frequency domain diversity signals. The core tasks include frequency domain planning, frequency division processing, and time slot allocation. The specific implementation and calculation process are as follows: (1) Frequency domain planning and calculation: Activate the spectrum sensing algorithm, scan the entire working frequency band of the Beidou positioning signal, and determine that the spectrum range of the available frequency band is [freq_s, freq_e], where freq_s is the starting frequency parameter of the available frequency band and freq_e is the ending frequency parameter of the available frequency band. At the same time, scan the working frequency band [freq_c_s, freq_c_e] of the mobile communication signal (freq_c_s is the starting parameter of the mobile communication signal frequency band and freq_c_e is the ending parameter) to ensure that there is no overlap between the Beidou available frequency band and the mobile communication frequency band, that is, freq_e < freq_c_s or freq_s > freq_c_e. Adopt an equal frequency domain division mechanism to divide the Beidou available frequency band into N non-overlapping frequency intervals, corresponding to the N-way radiation antennas of the in-building distribution system. Each frequency interval corresponds to a set of Beidou frequency domain diversity combined signals. The bandwidth of a single frequency interval is calculated as follows: Bandwidth = (freq_e - freq_s) / N, where Bandwidth is the bandwidth parameter of a single frequency interval. The start and end frequencies of each frequency interval are calculated as: the frequency interval corresponding to the k-th antenna is [freq_s + (k - 1) × Bandwidth, freq_s + k × Bandwidth], where k is the antenna serial number parameter (k = 1, 2,..., N). After division, reserve an interval frequency band Δfreq_gap (Δfreq_gap is the interval frequency band parameter) for each interval to avoid interference between adjacent interval signals. Finally, determine the actual start and end ranges of the N frequency intervals as [freq_s + (k - 1) × Bandwidth + (k - 1) × Δfreq_gap, freq_s + k × Bandwidth + (k - 1) × Δfreq_gap], ensuring that the total bandwidth of the N intervals and the interval frequency bands does not exceed the Beidou available frequency band width, that is, N × Bandwidth + (N - 1) × Δfreq_gap ≤ freq_e - freq_s, and complete the frequency domain planning calculation.

[0039] (2) Access and frequency domain mapping of the original Beidou signal: Access the original Beidou positioning signal, whose initial frequency is freq_bd_ori (freq_bd_ori is the Beidou original signal frequency parameter). Through frequency domain mapping technology, map the original Beidou positioning signal into the above-mentioned N planned frequency intervals respectively. The Beidou signal frequency corresponding to the k-th antenna after mapping is freq_bd_k = freq_s + (k - 1) × Bandwidth + (k - 1) × Δfreq_gap + Bandwidth / 2, so that the signal frequency after mapping is at the center position of the corresponding interval, ensuring the stability of signal transmission, and complete the frequency domain mapping operation.

[0040] (3) Frequency division and frequency difference calculation: For the mapped BeiDou signal in each frequency interval, the orthogonal frequency division algorithm is started to perform frequency division processing, splitting the BeiDou signal of a single segment into two initial BeiDou frequency domain point frequency signals, denoted as freq_k1 and freq_k2 (k=1,2,...,N), respectively. The preset frequency difference parameter is Δfreq_bd (Δfreq_bd is a fixed frequency difference parameter). According to the frequency division logic, the frequency difference between the two point frequency signals satisfies Δfreq_bd=|freq_k1-freq_k2|. Based on this relationship, the frequency division parameter is calculated, that is, freq_k1=freq_bd_k+Δfreq_bd / 2, freq_k2=freq_bd_k-Δfreq_bd / 2, ensuring that the frequency difference between the two point frequency signals is constant at Δfreq_bd, and the two point frequency signals All frequencies are within the corresponding planned frequency ranges, i.e., satisfying freq_s+(k-1)×Bandwidth+(k-1)×Δfreq_gap≤freq_k1≤freq_s+k×Bandwidth+(k-1)×Δfreq_gap, freq_s+(k-1)×Bandwidth+(k-1)×Δfreq_gap≤freq_k2≤freq_s+k×Bandwidth+(k-1)×Δfreq_gap. This calculation ensures that the frequency-divided point frequency signal does not exceed the planned frequency domain, avoiding frequency overflow. The freq_k1 and freq_k2 corresponding to each frequency range form a set of BeiDou frequency domain diversity combination signals, i.e., the BeiDou frequency domain diversity combination signal corresponding to the k-th antenna is (freq_k1,freq_k2).

[0041] (4) Time slot allocation in time-division mode: When switching to time-division generation mode, the time-division multiple access scheduling algorithm is started to allocate signal time slots. The duration parameter of a single signal time slot is set as T_slot, and the time slot interval parameter is T_gap. The total transmission period of N groups of Beidou frequency domain diversity combined signals is calculated as T_total=N×T_slot+(N-1)×T_gap. That is, each combined signal occupies a time slot with a duration of T_slot. An interval with a duration of T_gap is reserved between adjacent time slots to avoid time slot overlap. According to the antenna sequence number k=1 to k=N, a corresponding time slot is allocated to each group of BeiDou frequency domain diversity combined signals. The start time of the time slot corresponding to the k-th combined signal is T_start_k=(k-1)×(T_slot+T_gap), and the end time is T_end_k=(k-1)×(T_slot+T_gap)+T_slot. The time slot allocation is completed through this calculation. Each group of BeiDou frequency domain diversity combined signals is output in the order of the time slots to form BeiDou time-division frequency domain diversity signals, which are then output to the signal combining unit.

[0042] 2. Implementation process of the signal combining unit This unit receives signals output from the BeiDou multi-channel signal generation unit and performs corresponding preprocessing, combining, or amplitude adjustment operations based on the signal type. The specific implementation and calculation process are as follows: (1) Signal reception and preprocessing: Receive the BeiDou frequency domain diversity combined signal (N groups in total, each group is (freq_k1, freq_k2)) or BeiDou time-division frequency domain diversity signal output by the BeiDou multi-channel signal generation unit. First, perform signal filtering, amplitude adjustment and phase calibration preprocessing on the received signal (only for BeiDou frequency domain diversity combined signal, BeiDou time-division frequency domain diversity signal does not perform combining processing, only amplitude adjustment).

[0043] (2) Filtering: Start the filtering algorithm and set the filter passband range to [freq_s-Δfreq_filter,freq_e+Δfreq_filter], where Δfreq_filter is the filter redundancy frequency band parameter to ensure that the filter passband completely covers the available frequency band of Beidou and filters out external clutter signals whose frequency exceeds this range. During the filtering process, the signal frequency is collected in real time to ensure that the frequency of the filtered signal remains at freq_k1 and freq_k2 (for combined signals) or the point frequency signal frequency of the corresponding time slot (for time-division signals) to complete the filtering operation.

[0044] (3) Amplitude adjustment and calculation: For the filtered signal, the amplitude is adjusted. The target amplitude parameter is set as A_target (A_target is the target amplitude parameter of the signal). The actual amplitude of the filtered signal A_actual is collected in real time. The amplitude adjustment coefficient K_A = A_target / A_actual is calculated. The signal amplitude is multiplied by the adjustment coefficient K_A through the amplitude adjustment module. That is, the adjusted signal amplitude A_adjust = A_actual × K_A. This ensures that the adjusted signal amplitude is constant at A_target. The amplitudes of all combined signals are kept consistent. The amplitude of the time-division signal is also adjusted to A_target. The amplitude adjustment calculation and operation are completed.

[0045] (4) Phase calibration and calculation: For the BeiDou frequency domain diversity combined signal, a phase calibration operation is performed after amplitude adjustment. The reference phase parameter is set as φ_ref (φ_ref is the phase reference parameter). The actual phases φ_k1 and φ_k2 (k=1,2,...,N) of the two point frequency signals in each group of combined signals are collected in real time. The phase deviations Δφ_k1=φ_k1-φ_ref and Δφ_k2=φ_k2-φ_ref are calculated. The phase adjustment coefficients K_φ1=φ_ref / φ_k1 and K_φ2=φ_ref / φ_k2 are adjusted. The phases of the two point frequency signals are multiplied by the corresponding adjustment coefficients, that is, the calibrated phases φ_k1_adjust=φ_k1×K_φ1 and φ_k2_adjust=φ_k2×K_φ2 are adjusted to ensure that the phase of the calibrated signal is consistent with the reference phase φ_ref. The phases of all combined signals are kept synchronized, and the phase calibration calculation and operation are completed.

[0046] (5) Combining and Calculation: After phase calibration, the combining operation is performed. The N groups of Beidou frequency domain diversity signals are connected to the combining link in the frequency domain order (i.e., in the order of the frequency intervals corresponding to antenna number k=1 to k=N). The combining gain parameter is set to G_comb (G_comb is the combining gain parameter). The total amplitude of the combined signal A_comb=N×A_target×G_comb is calculated. The frequency of the combined signal covers the frequency range of all combined signals, i.e. [freq_11,freq_N2], forming a Beidou frequency domain combined cooperative signal set. The signal spectrum is monitored in real time during the combining process to ensure that the combined signal has no frequency overlap and no phase interference. The combining calculation and operation are completed. For Beidou time-division frequency domain diversity signals, the combining operation is not performed. After only amplitude adjustment, the signal is directly output to the mobile communication transmission unit.

[0047] 3. Implementation process and calculation of mobile communication transmission unit This unit is based on a communication and navigation collaborative network to realize the shared transmission of BeiDou signals and mobile communication signals. The specific implementation and calculation process are as follows: (1) Signal access and impedance adjustment: The signal is accessed by the Beidou frequency domain combined signal set (amplitude A_comb, frequency range [freq_11,freq_N2]) or the Beidou time-division frequency domain diversity signal (amplitude A_target, frequency is the point frequency signal frequency of the corresponding time slot) output by the signal combining unit, and the mobile communication signal (frequency range [freq_c_s,freq_c_e], amplitude A_c) is also accessed. The adaptive impedance matching algorithm is activated to detect the characteristic impedance Z_net (Z_net is the characteristic impedance parameter of the transmission network) of the communication and conduction collaborative network in real time. The actual output impedance Z_bd_actual of the accessed BeiDou signal is collected, the impedance deviation ΔZ=Z_bd_actual-Z_net is calculated, and the impedance adjustment coefficient K_Z=Z_net / Z_bd_actual is adjusted. The output impedance of the BeiDou signal is multiplied by the adjustment coefficient K_Z, that is, the adjusted impedance Z_bd_adjust=Z_bd_actual×K_Z. This ensures that the adjusted output impedance of the BeiDou signal is consistent with the characteristic impedance Z_net of the transmission network, thus completing the impedance adjustment calculation and operation.

[0048] (2) Frequency domain isolation and calculation: Start the frequency domain isolation filtering mechanism. Based on the frequency range difference between the BeiDou signal and the mobile communication signal, set the filter passband and stopband parameters. The passband range is set to [freq_s-Δfreq_filter,freq_e+Δfreq_filter] (consistent with the filter passband of the signal combining unit), and the stopband range is set to [freq_c_s-Δfreq_filter,freq_c_e+Δfreq_filter]. Calculate the isolation parameter S_isol (S_isol is the frequency domain isolation parameter) to ensure that the isolation satisfies S_isol≥|freq_bd_min-freq_c_min| / Δfreq_filter (where freq_bd_min is the minimum frequency of the BeiDou signal and freq_c_min is the minimum frequency of the mobile communication signal). Through this calculation, ensure that the filter can effectively separate the BeiDou signal and the mobile communication signal and avoid mutual interference between the two types of signals. Connect the BeiDou signal and the mobile communication signal after impedance adjustment to the filter at the same time to complete the frequency domain isolation operation.

[0049] (3) Power Amplification and Clutter Filtering: The BeiDou signal after frequency domain isolation is amplified. The power amplification target parameter is set as P_target (P_target is the target power parameter of the signal). The actual power P_actual of the BeiDou signal before amplification is collected, and the power amplification factor K_P = P_target / P_actual is calculated. The power of the BeiDou signal is multiplied by the amplification factor K_P through the power amplification module, that is, the power after amplification P_adjust = P_actual × K_P, ensuring that the power of the amplified signal is constant at P_target. After power amplification, the filtering algorithm is restarted to filter out the harmonic clutter generated during the amplification process, ensuring that the frequency of the filtered signal remains the corresponding BeiDou signal frequency, thus completing the power amplification and clutter filtering operation.

[0050] (4) Transmission and Radiation: The amplified and filtered BeiDou signal and mobile communication signal are transmitted through the transmission link of the communication indoor distribution system. The transmission loss coefficient is set to α (α is the transmission loss parameter). The actual power of the signal after transmission is calculated as P_trans=P_adjust×(1-α) to ensure that the signal power after transmission can still meet the radiation requirements. The signal is distributed to N radiating antennas through the transmission link. The two types of signals are synchronously radiated to the closed scene according to the preset radiation angle to generate the BeiDou common network radiation signal. The frequency range of this signal is still the frequency range of the BeiDou signal and the mobile communication signal, and the amplitude is the amplitude corresponding to P_trans. The signal transmission and radiation operation is completed, and the BeiDou common network radiation signal is output to the BeiDou signal conversion unit.

[0051] 4. Implementation process of the BeiDou signal conversion unit This unit accesses the BeiDou shared network radiation signal and, based on the mixing core logic, completes signal splitting, mixing operations, clutter filtering, and positioning signal generation. The specific implementation process is as follows: (1) Signal access and preliminary filtering: The BeiDou network radiation signal output by the mobile communication transmission unit is accessed, the basic filtering algorithm is started, external noise mixed in during transmission is filtered out, the spectrum of the filtered signal is collected, and it is confirmed that the signal contains all BeiDou frequency domain point frequency signals freq_k1 and freq_k2 (k=1,2,...,N), and the preliminary filtering operation is completed.

[0052] (2) Frequency signal splitting and calculation: Based on the preset frequency domain parameters (i.e., the frequency range planned by the Beidou multi-channel signal generation unit and the frequency parameters of the frequency signal), the frequency domain gating filtering algorithm is started. The gating filtering range is set to the range [freq_s+(k-1)×Bandwidth+(k-1)×Δfreq_gap,freq_s+k×Bandwidth+(k-1)×Δfreq_gap] (k=1,2,...,N) corresponding to each frequency range. The two Beidou frequency domain frequency signals freq_k1 and freq_k2 are split one by one through gating filtering. During the splitting process, the signal frequency is collected in real time and compared with the preset freq_k1 and freq_k2. The frequency deviation Δfreq_split=|freq_split-freq preset| (freq_split is the actual frequency after splitting, and freq preset is the preset frequency of the frequency signal) is calculated to ensure that Δfreq_split approaches 0, and the accurate splitting and verification calculation of the frequency signal is completed.

[0053] (3) Mixing operation and RF combined signal generation (core calculation): Start the passive mixing operation mechanism. Based on the mixing logic of Scheme 1 in Appendix, perform frequency difference operation on each of the two point frequency signals freq_k1 and freq_k2 after splitting to generate RF combined signal. Set the frequency of RF combined signal to freq_rf_k (k=1,2,...,N). According to the mixing operation rules, freq_rf_k=|freq_k1-freq_k2|. Combined with the preset frequency difference Δfreq_bd=|freq_k1-freq_k2| set in the Beidou multi-channel signal generation unit, we can get freq_rf_k=Δfreq_bd. That is, after each group of point frequency signals is mixed, the frequency of the generated RF combined signal is equal to the preset frequency difference Δfreq_bd, so as to realize the frequency unification of RF combined signal. Simultaneously, the mixing gain parameter G_mix (G_mix is ​​the mixing gain parameter) is calculated. The amplitude of the RF combined signal after mixing is A_rf_k=(A_target×K_A×G_comb×K_P×(1-α))×G_mix, ensuring that the amplitude of the signal after mixing remains stable, thus completing the core calculations for mixing operation and RF combined signal generation.

[0054] (4) Harmonic and clutter filtering: For the generated RF combined signal, start the adaptive clutter suppression algorithm, set the clutter filtering threshold parameter to Δfreq_clutter (Δfreq_clutter is the clutter filtering threshold), collect the signal spectrum in real time, identify and filter out harmonic and spurious signals whose frequency deviates from Δfreq_bd and exceeds the range of Δfreq_clutter, calculate the clutter suppression ratio S_clutter=A_rf_k / A_clutter (A_clutter is the amplitude of the clutter signal), ensure that the clutter suppression ratio meets the preset requirements, and complete the harmonic and clutter filtering operation.

[0055] (5) Signal Shaping and Timing Calibration: The radio frequency combined signal after filtering out noise is shaped. The target waveform parameter is set as Wave_target (Wave_target is the target waveform parameter of the signal). The actual waveform Wave_actual of the signal before shaping is acquired in real time. The waveform shaping coefficient K_wave is adjusted to ensure that the shaped signal waveform is consistent with the target waveform Wave_target. At the same time, timing calibration is performed. The target timing parameter is set as T_ref (T_ref is the timing reference parameter). The actual timing T_actual of the signal is acquired. The timing deviation ΔT=T_actual-T_ref is calculated. The timing adjustment coefficient K_T=T_ref / T_actual is adjusted. The signal timing is multiplied by the adjustment coefficient K_T, that is, the calibrated timing T_adjust=T_actual×K_T. This ensures that the calibrated signal timing is consistent with the target timing T_ref, and the signal shaping and timing calibration operation is completed.

[0056] (6) Beidou positioning signal generation: After the timing calibration is completed, a Beidou positioning signal is generated. The frequency of the signal is freq_rf_k=Δfreq_bd, the amplitude is A_rf_k, the waveform and timing both meet the preset requirements, and are consistent with the core characteristics of the original Beidou positioning signal. It can be directly accessed by various terminals such as smartphones, vehicle terminals, and wearable devices to realize positioning and navigation functions and complete the signal processing link of the entire system.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A BeiDou and mobile communication fusion positioning system based on frequency division mixing, characterized in that, It includes a BeiDou multi-channel signal generation unit, a signal combining unit, a mobile communication transmission unit, and a BeiDou signal conversion unit; The BeiDou multi-channel signal generation unit scans the BeiDou signal frequency band, divides the frequency interval, and generates a planned frequency domain; it receives the original BeiDou positioning signal, maps it to the planned frequency domain, and splits it through frequency division processing to generate an initial BeiDou frequency domain point frequency signal based on a preset frequency difference, forming a BeiDou frequency domain diversity combination signal; in time-division mode, it allocates signal time slots and outputs a BeiDou time-division frequency domain diversity signal. The signal combining unit receives the BeiDou frequency domain diversity combined signal, performs signal filtering, amplitude adjustment and phase calibration preprocessing, extracts signal frequency features and performs combining in frequency domain order, adjusts signal amplitude, completes phase synchronization operation, and generates BeiDou frequency domain combined cooperative signal set; it also receives the BeiDou time-division frequency domain diversity signal, determines the signal timing, does not perform combining processing, and adjusts signal amplitude. The mobile communication transmission unit is based on the communication and navigation collaborative network transmission network. It adjusts the impedance of the BeiDou frequency domain combined collaborative signal set or the BeiDou time-division frequency domain diversity signal to isolate it from the mobile communication signal in the frequency domain. After power amplification and filtering out noise, it generates the BeiDou network radiation signal through the transmission link. The BeiDou signal conversion unit accesses the BeiDou network radiation signal, splits the BeiDou frequency domain point frequency signal based on the preset frequency domain, performs frequency difference calculation to generate radio frequency combined signal, filters out harmonic noise, and generates BeiDou positioning signal after signal shaping and timing calibration.

2. The system according to claim 1, characterized in that, The specific process of scanning the BeiDou positioning signal frequency band includes: comprehensively scanning the working frequency band of the BeiDou positioning system, capturing the spectral characteristics of all signals within the working frequency band, and determining the BeiDou positioning signal and interference signal through spectral feature comparison; marking the spectral characteristics of the interference signal, delineating the interference-free signal frequency band as the usable frequency band, and simultaneously marking the spectral range of the interference frequency band.

3. The system according to claim 1, characterized in that, The specific process of dividing the frequency intervals includes: retrieving the scanned and stored frequency bands and marked interference frequency bands; firstly, removing the interference frequency bands from the overall frequency bands; dividing the interference-free frequency bands into frequency intervals of uniform width; during the division process, detecting the spectral boundaries of adjacent intervals in real time; reserving fixed interval frequency bands for adjacent frequency intervals; after the division is completed, performing spectral calibration on each frequency interval; and recording and archiving the spectral parameters of the frequency intervals.

4. The system according to claim 1, characterized in that, The specific process of generating the initial BeiDou frequency domain point frequency signal through frequency division processing includes: accessing the original BeiDou positioning signal, performing spectrum preprocessing to remove redundant clutter, and calibrating the spectrum amplitude of the preprocessed signal; mapping the calibrated BeiDou signal to each planned and archived frequency interval, performing frequency division processing on the BeiDou signal mapped to each frequency interval, splitting the BeiDou signal of a single frequency band into two point frequency signals, calibrating the frequency difference within a preset frequency difference range based on the frequency data of the two point frequency signals, adjusting the amplitude of the two point frequency signals to be consistent, generating the initial BeiDou frequency domain point frequency signal, and recording the frequency and amplitude parameters of the initial BeiDou frequency domain point frequency signal.

5. The system according to claim 1, characterized in that, The specific process of allocating signal time slots in the time-division mode includes: retrieving the BeiDou frequency domain diversity combination signal and its corresponding spectral parameters, sorting them according to the generation time order, allocating an independent signal time slot for each sorted BeiDou frequency domain diversity combination signal, and marking each signal time slot with a time slot identifier; associating and storing the time slot identifier with the spectral parameters of the corresponding BeiDou frequency domain diversity combination signal, fixing the time slot duration and time slot interval; calibrating the boundaries of adjacent time slots, and retrieving the BeiDou frequency domain diversity combination signal one by one according to the order corresponding to the time slot identifier to generate the BeiDou time-division frequency domain diversity signal.

6. The system according to claim 1, characterized in that, The specific process of signal filtering includes: performing preliminary spectrum detection on the BeiDou frequency domain diversity combined signal, recording the spectrum distribution range, connecting the BeiDou frequency domain diversity combined signal to a preset filtering link, and performing spectrum filtering.

7. The system according to claim 1, characterized in that, The specific process of extracting signal frequency features and performing combining includes: performing spectrum analysis on the BeiDou frequency domain diversity combined signal, extracting the core parameters of the BeiDou signal in each frequency interval, including center frequency, signal amplitude and phase information; classifying, recording and verifying the core parameters, eliminating abnormal parameter data, sorting the core parameters of all frequency intervals based on the natural order of the center frequency, and connecting the BeiDou signals of each frequency interval to the combining link in sequence according to the sorting result, and integrating to generate the BeiDou frequency domain combining cooperative signal set.

8. The system according to claim 1, characterized in that, The specific process of the phase synchronization operation includes: acquiring the phase information of each BeiDou signal in real time, comparing the phase deviation between different BeiDou signals, and calculating the deviation value with the reference phase; adjusting the phase deviation based on the preset synchronization threshold, feeding back the phase deviation data in real time during the adjustment process, and continuously calibrating until the phase deviation of all signals is reduced to within the preset synchronization threshold range.

9. The system according to claim 1, characterized in that, The specific process of adjusting the impedance of the BeiDou frequency domain combined cooperative signal set or the BeiDou time-division frequency domain diversity signal includes: performing preliminary impedance detection on the BeiDou frequency domain combined cooperative signal set or the BeiDou time-division frequency domain diversity signal, collecting output impedance data, detecting the characteristic impedance of the communication and conduction cooperative network in real time, obtaining the characteristic impedance data of the communication and conduction cooperative network, calculating the impedance deviation value, and dynamically adjusting the output impedance parameters according to the impedance deviation value.

10. The system according to claim 1, characterized in that, The specific process of frequency domain isolation includes: performing spectrum analysis on the BeiDou frequency domain combined signal set or the BeiDou time-division frequency domain diversity signal and the mobile communication signal to obtain the spectrum characteristics and frequency range of the two types of signals; determining the passband and stopband parameters of the filter based on the frequency difference between the two types of signals, and isolating the frequency domain of the two types of signals through filtering.

11. The system according to claim 1, characterized in that, The specific process of extracting BeiDou frequency domain point frequency signals based on a preset frequency domain includes: removing external noise mixed in during the transmission of the BeiDou shared network radiated signal, obtaining spectrum data, retrieving preset frequency parameters of the initial BeiDou frequency domain point frequency signal, and generating a filtering range; connecting the BeiDou shared network radiated signal to the filtering link, filtering signals that match the preset frequency parameters, and gradually extracting two BeiDou frequency domain point frequency signals corresponding to each group of BeiDou frequency domain diversity combination signals; obtaining the frequency data of the BeiDou frequency domain point frequency signals and comparing them with the frequency parameters of the initial BeiDou frequency domain point frequency signals.

12. The system according to claim 1, characterized in that, The specific process of generating the radio frequency combined signal by performing frequency difference calculation includes: performing spectrum calibration on the BeiDou frequency domain point frequency signals respectively, obtaining the calibrated frequency data, retrieving the preset frequency difference of the initial BeiDou frequency domain point frequency signals, performing subtraction operation on the two split BeiDou frequency domain point frequency signals, eliminating the instantaneous noise signals generated during the calculation process, performing spectrum shaping on the calculated signal, adjusting the spectrum shape of the signal, and generating the radio frequency combined signal.

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