108 results about "Squitter" patented technology

The invention provides an unmanned aerial vehicle navigation decoy method and system based on multimode satellite signal counterfeiting. The method comprises the following steps: firstly, acquiring original signal parameters, covering signal time delay, carrier phase and signal intensity distribution, of multimode satellite signals in an unmanned aerial vehicle navigation link in a target area in real time; secondly, extracting spatio-temporal characteristics through signal time delay and carrier phase, and generating time domain synchronous forged navigation parameters in combination with signal strength dynamic change; dynamically adjusting the signal time delay correction and the carrier phase offset in the forged navigation parameters; meanwhile, dynamic compensation is carried out on the navigation message based on the three-dimensional coordinate increment, and a multimode forged navigation signal covering the receiving end of the unmanned aerial vehicle is generated; and finally, superposing the forged navigation signal and the original signal parameter to form a deceptive navigation track for inducing the unmanned aerial vehicle to deviate from the original route. According to the technical scheme provided by the invention, the multi-mode compatibility and concealment of navigation decoy of the unmanned aerial vehicle can be improved.

The invention relates to a GNSS / 5G fusion location information service performance monitoring method and system, and relates to the technical field of navigation positioning, and the method comprises the steps: obtaining ground object receiving performance monitoring point information outputted by a monitoring data collection terminal; capturing the acquired data to obtain a rough code phase value and a carrier frequency of the received satellite navigation signal; executing tracking processing to obtain navigation message data and pseudo-range observed quantity demodulated by an instant I branch component of a received satellite navigation signal; obtaining a unique solution of a three-dimensional space coordinate position of the ground object receiving performance monitoring point as a positioning calculation result; obtaining a positioning precision deviation; obtaining a visible satellite number monitoring result; and obtaining a DOP value monitoring result. According to the method, the system abnormal condition is judged through comprehensive application, reliable time-frequency information service guarantee is provided for the terminal equipment, and the use performance of the terminal equipment is ensured.

The invention discloses an enhanced positioning SSR real-time correction loop monitoring method and device, and belongs to the technical field of satellite navigation positioning. The method comprises the following steps: monitoring the quality of reference station data through an SSR correction parameter estimation monitoring end, and generating a data source link quality identifier Q-I; performing precision comparison and availability monitoring on the independently estimated SSR correction product and a third-party service mechanism product through an SSR correction product monitoring end, and generating a product information source link quality identifier Q-II; user positioning scenes with different precision requirements are simulated through an SSR correction product service monitoring end, and a product service link quality identifier Q-III is generated; and encoding the quality identifiers Q-I, Q-II and Q-III into an SSR message at an SSR recoding end for broadcasting. According to the invention, the operation system can provide hierarchical services, and different user requirements are guaranteed.

The invention discloses a communication and conduction integrated navigation information broadcasting method suitable for a long navigation message. The method comprises the following steps: (1) injecting a navigation enhancement message to be broadcasted to a satellite from the ground; (2) the satellite processes the uploaded navigation enhancement message to generate a navigation message frame; (3) carrying out interleaving processing on the navigation message frames to form navigation message subframes; (4) performing CRC-x verification on the navigation message subframes; (5) carrying out 1 / 2 LDPC error correction coding on the navigation message sub-frame after the CRC-x verification; and (6) broadcasting the navigation message after the LDPC error correction coding and the communication signal at the same time, adopting the same waveform and occupying different bandwidth resources. The broadcasting method provided by the invention solves the problem of low frame splicing success rate of the long telegraph text.

The invention relates to the technical field of clock synchronization, in particular to a high-precision clock synchronization method and system based on Beidou satellite navigation, and the method comprises the steps: a pseudo satellite master station receives a Beidou signal, carries out the processing of capturing, tracking and the like, solves the transmission time and transmission delay, and adjusts a local clock to obtain the local receiving time; the 1PPS pulse is corrected, so that the rising edge of the 1PPS pulse is aligned with the whole second time of the local receiving time; and the master station completes time service by taking the 1PPS as an anchor point, adjusts the telegraph text transmission time delay, and broadcasts time service information to the slave station. And the slave station receives the telegraph text resolving time, calculates the transmitting time and synchronously transmits the telegraph text with the master station, so that the time synchronization of the ground-based pseudo satellite system and the Beidou is realized. According to the method provided by the embodiment of the invention, the unification of the ground-based pseudo satellite system and the Beidou time reference is realized, the problem that the existing system cannot unify the time reference with the Beidou is solved, high-precision time synchronization is ensured, and indoor and outdoor seamless positioning is supported.

The invention discloses an inter-system synchronization method and device of a navigation positioning time service system, relates to the technical field, and aims to solve the problem that an existing large-scale ground-based PNT system does not consider time synchronization deviation between multiple subsystems, so that PNT service errors are caused by synchronization deviation in an overlapping coverage area of two subsystems. According to the invention, the inter-system synchronization receiver is arranged in the overlapping coverage area of the two subsystems, the synchronization deviation value between the two subsystems is measured through the inter-system synchronization receiver, and the synchronization deviation value is played to the navigation receiver in the overlapping area through the navigation message broadcasting system of the navigation base station; and the navigation receiver receives the synchronization deviation of the navigation base station, corrects the synchronization deviation by adopting a correction algorithm, and then carries out high-precision navigation positioning service.

The invention provides a satellite internet rapid high-precision navigation positioning method, a transmitting end modulates a navigation message and broadcasts the navigation message through a satellite internet frequency band, the advantage of satellite internet multi-carrier modulation is utilized, an I branch of QPSK is adopted for rapid parallel broadcasting, and the satellite internet multi-carrier modulation speed is improved. Basic navigation positioning parameters obtained for the first time are improved from the second level to the millisecond level of single-wave-position residence; a receiving end demodulates a received signal to obtain a navigation message, QPSK modulation is adopted, phase division is carried out on a Q branch supporting high-precision measurement and an I branch of the modulated message, and the Q branch is used for high-precision frequency offset estimation and time delay estimation; and the branch I carries out rapid navigation message broadcasting, so that high-precision frequency and time delay measurement is realized, and rapid message broadcasting is also realized.

The invention discloses an integrated navigation optimization method and a computer system, and the method comprises the steps: GNSS telegraph text extraction: obtaining an MSM observation telegraph text and a BRDC ephemeris telegraph text; gNSS telegraph text decoding is carried out to obtain a multi-system GNSS observation value and a multi-system satellite broadcast ephemeris parameter; constructing a GNSS pseudo-range observation equation: calculating a satellite position, and correcting a system error to obtain a linearized error equation; estimating a position parameter and a variance-covariance matrix thereof, and extracting satellite ranging precision from the broadcast ephemeris; the standard deviation of the position parameters is extracted, a distance measurement precision projection matrix is calculated, and the GNSS protection level is calculated; and setting an alarm threshold along the course, and when the protection level is smaller than the alarm threshold, incorporating a GNSS resolving result into the integrated navigation system to correct the accumulated drift of the INS system. The method has the advantages that an overall better integrated navigation output result is obtained, and the overall precision of the integrated navigation system in a complex environment is optimized.

The invention provides a time service and time keeping method based on satellite-borne GNSS high-precision real-time orbit determination, which has the function of resolving the clock error and clock drift of a receiver in real time, and can perform time model correction by using the clock error and clock drift, thereby finally realizing high-precision time service and time keeping functions. The method is characterized in that rough time information is extracted from a message of a navigation signal; performing high-precision orbit determination through a dual-frequency carrier phase, and resolving a clock error and clock drift in real time; calculating the hardware time delay of the whole signal link by using a high-precision hardware time delay estimation technology; real-time frequency modulation and phase modulation are carried out by using clock drift and clock difference information, and a high-precision time service technology is realized; after a navigation satellite signal is interrupted, a local time model is maintained and PPS (pulse per second) is output by utilizing orbit extrapolation, clock error and clock drift information and a time model, so that a high-precision time keeping function is realized; fusion and advantage complementation of the constant-temperature crystal oscillator and the GNSS receiver are realized, and the cost of high-precision time service is reduced.

The invention discloses a portable PPP-B2b Beidou positioning and timing device. The portable PPP-B2b Beidou positioning and timing device comprises a GNSS (Global Navigation Satellite System) receiver module, a resolving module and a data resolving precision evaluation module, the GNSS receiver module is used for obtaining an original navigation message and an observed quantity, the resolving module comprises a microcontroller, a serial port communication unit and a clock unit, the original navigation message and the observed quantity are output to the microcontroller in a real-time data flow mode, and the microcontroller receives data and then arranges the data to generate real-time precise track data; position and time calculation is carried out through the data calculation precision evaluation module, position information is sent out through the serial port communication unit, a clock error sequence is forecasted, and the frequency of the clock unit and output of second signals are controlled. The positioning time service device with the precision of static centimeter level, dynamic decimeter level and superior to nanosecond level is realized, the requirements of precise positioning and time synchronization of electric power services such as intelligent inspection and personnel safety operation on a scene without ground communication are met, and an automatic real-time solution is provided.

The invention provides an autonomous intact monitoring method for a navigation satellite message, which comprises the following steps: calculating first state information at a predetermined moment by extrapolating navigation message parameters of a historical top-injection message, calculating second state information according to navigation message parameters of a new top-injection message top-injection at the predetermined moment, and calculating a first difference value between the first state information and the second state information; acquiring a regional system signal and a global system signal which are uploaded at the same moment, and respectively calculating state information corresponding to the regional system signal and the global system signal and a second difference value between the state information; and judging whether the first difference value and the second difference value both exceed corresponding alarm thresholds or not, and if yes, generating incomplete alarm information. Thus, autonomous integrity monitoring of the on-satellite telegraph text can be achieved, monitoring and warning can be conducted on abnormity of the telegraph text caused by uplink injection, malicious tampering and the like, and the situation that a wrong positioning result is caused after a wrong telegraph text is broadcasted to a ground user is prevented.

The invention belongs to the technical field of satellite navigation, and particularly relates to a high-precision navigation anti-interference module based on optical switch control, which comprises an antenna array unit used for receiving BDS B3 and BDS S frequency point navigation signals; the central independent oscillator is used for completing a function of transmitting BDS L frequency point signals; the optical switch chip control module is used for controlling signal receiving and transmitting; the low noise amplifier unit is used for amplifying and filtering the navigation signal; the anti-interference processing unit is used for completing anti-interference processing services of BDS B3 and RDSS S frequency points; the power supply and navigation unit is used for completing internal and external interface service processing, completing the functions of capturing, tracking, telegraph text decoding, PVT resolving and time service of satellite navigation signals of BDS B3 and BDS S frequency points, and completing the functions of modulation, up-conversion emission and emission enabling control of BDS L frequency points; and a communication port for communicating with an external device. According to the invention, three frequency point signals of BDS L, BDS B3 and BDS S can be supported at the same time, and the anti-interference performance is good.

The invention discloses a double-frequency signal parallel capturing method and system based on Beidou satellite signals, and relates to the technical field of signal processing, and the method comprises the steps: receiving Beidou B1I and B1C double-frequency-band signals through an antenna, and carrying out the preprocessing of the Beidou B1I and B1C double-frequency-band signals; signal quality is optimized through high-order cumulant processing, and frequencies and code phases of B1I and B1C signals are corrected through Doppler frequency shift information and navigation messages provided by an LEO satellite; and synchronously locking the frequency and the phase of the dual-frequency signal, and carrying out carrier tracking and code phase tracking on the dual-frequency signal. According to the method, the high-order cumulant is introduced to optimize the signal quality, the accuracy of signal main peak identification can be enhanced, the interference of noise and secondary peaks can be effectively suppressed, Doppler frequency shift information and navigation messages of the LEO satellite are introduced in the signal capturing stage, the accuracy of frequency offset correction is further improved, and the accuracy of signal processing is improved. The multi-frequency signal capturing precision and the anti-interference capability can be more effectively improved, and the robustness of dual-frequency signal capturing is improved.

This invention relates to the field of satellite communication technology, and in particular to a method for transmitting positioning information using an anti-interference BeiDou positioning base station. The method involves acquiring signals transmitted by the user terminal through the anti-interference base station and transmitting them to the master control station. The master control station then transmits the signals to the BeiDou satellite for processing to obtain navigation messages. These navigation messages are then sent to the user terminal via the master control station and the anti-interference base station. The user terminal performs positioning calculations based on the satellite signals to achieve real-time location updates. During transmission, the master control station calculates the bit error rate (BER) in the BeiDou satellite's navigation message generation process. Based on the BER, it determines whether the transmission process conforms to standards. Furthermore, based on this determination, it further assesses the transmission process in conjunction with data integrity, or identifies the reasons for non-compliance based on the BER and generates corresponding instructions. These instructions are used to adjust relevant parameters, thereby reducing the BER, improving the accuracy of navigation message generation, and ultimately increasing information transmission efficiency. This provides positioning support for operational equipment, inspection personnel, and other similar applications.

The application discloses a satellite broadcast simulation method, device and equipment and a readable storage medium, and relates to the technical field of satellite communication. The satellite broadcast simulation method comprises the following steps: acquiring navigation message data and enhanced message data; framing the navigation message data and the enhanced message data respectively to obtain navigation signal frames and enhanced signal frames; and modulating the navigation signal frames and the enhanced signal frames simultaneously in response to a timing control signal, and transmitting the modulated navigation signal frames and enhanced signal frames. The application simulates the process of broadcasting navigation signals and enhanced signals by real low-orbit satellites, thereby improving the authenticity of the test environment for the receiving terminal of the low-orbit satellite communication system, and simultaneously modulating based on the timing control signal, thereby avoiding the delay error in the early receiving and framing process and reducing the probability of timing error.

The application discloses a B3I signal simulation method and device, terminal equipment and storage medium, through obtaining ephemeris data, generating pseudo code and extension code, and modulating the same, a real B3I signal can be quickly and accurately generated. In this way, the original signal simulation can be freed from the dependence on hardware equipment, and only ephemeris data provided by a user and satellite messages of a Beidou satellite are needed to generate a corresponding B3I signal. In addition, a Doppler frequency shift is calculated according to the distance between a satellite and the user, and is applied to carrier modulation, so that the B3I signals of various satellites can be more accurately simulated. By comprehensively considering ephemeris data, distance calculation, pseudo code generation, Doppler frequency shift and navigation messages and the like, a real B3I signal with a Doppler effect can be generated, which provides a beneficial tool and data for testing and verification of a B3I signal receiver, so that the research and development efficiency of a navigation satellite signal receiver is improved.

The invention discloses a regional enhanced positioning time service method and system based on an air platform, and relates to a navigation enhanced positioning time service technology, and the method comprises the steps: controlling a ground station and the air platform to complete the positioning time service of time-frequency reference equipment through receiving an air navigation signal, so as to obtain the positioning time service information of the ground station and the air platform; controlling bidirectional time synchronization between the ground station and any air platform to keep time synchronization between the air platforms, and acquiring clock difference information between the air platforms and the ground station; any air platform forms the positioning time service information and the clock error information of the air platform into a telegraph text frame, and sends an area enhancement signal to the ground user terminal; and the ground user terminal receives the area enhancement signal so as to obtain the distance from any air platform to the ground user terminal and the positioning time service information of the air platform, and positioning time service is completed through calculation. According to the invention, the positioning time service problem of the navigation terminal in a satellite navigation signal rejection environment can be effectively solved.

The invention relates to the technical field of satellite communication, in particular to a positioning information transmission method of an anti-interference Beidou positioning base station, and the method comprises the steps: obtaining a signal transmitted by a user side through an anti-interference base station, transmitting the signal to a master control station, transmitting the signal to a Beidou satellite through the master control station, and carrying out the processing to obtain a navigation message, a navigation message is sent to the user side through the main control station and the anti-interference base station, and the user side carries out positioning calculation by combining with a satellite, so that real-time position updating is realized; in the transmission process, the master control station counts the bit error rate in the navigation message generation process of the Beidou satellite, judges whether the transmission process meets the standard or not based on the bit error rate, and further judges the transmission process in combination with the data integrity on the basis of judgment, or determines the reason for not meeting the standard according to the bit error rate and generates a corresponding instruction. And corresponding parameters are adjusted according to the instruction, so that the bit error rate is reduced, the navigation message generation precision is improved, the information transmission efficiency is improved, and positioning support is provided for operation equipment, inspection personnel and the like.

The invention discloses a remote control Beidou AIS dual-mode forwarding beacon method and system, and the method comprises the steps: receiving a weak downlink signal through a Beidou receiving and transmitting antenna, and outputting the weak downlink signal to a radio frequency chip after the weak downlink signal is amplified and filtered through an S, B3, B1 and B2b frequency band radio frequency switch and a low-noise amplifier of the radio frequency chip; when communication is carried out, the baseband chip generates a corresponding telegraph text according to needs, carries out spectrum spreading on the telegraph text and sends the telegraph text to the radio frequency chip in the form of a baseband signal, the radio frequency chip modulates baseband information to a transmitting carrier wave, amplifies the transmitting signal, and transmits the transmitting signal to the Beidou receiving and transmitting antenna through the power amplifier and the radio frequency switch to be transmitted out; therefore, the remote control Beidou AIS dual-mode forwarding mark can be carried by a person who moves on the water surface, can also be installed on an airplane and a ship for use, can be automatically triggered to send out Beidou and AIS alarm signals when the forwarding mark is in danger and falls into water, can also collect nearby AIS information and forward the AIS information to a receiving station through a Beidou short message, and provides safety guarantee.

The invention discloses a broadcast ionosphere model adaptive selection method for a GNSS (Global Navigation Satellite System) terminal, which comprises the following steps: receiving navigation message information broadcasted by each GNSS system in real time, and obtaining various broadcast ionosphere model parameters; calculating the geographic latitude corresponding to the ionospheric puncture point according to the current position coordinate of the user, the satellite elevation angle and the azimuth angle; according to the geographic latitude and the time period of the current calculation time, selecting an optimal broadcast ionosphere model under the current space-time condition; and according to the optimal broadcast ionosphere model and the broadcast ionosphere model parameters, calculating to obtain a correction value of the ionosphere delay amount. According to the invention, by selecting the optimal broadcast ionosphere model in the current environment, the positioning precision is improved, the error of a certain model is prevented from being amplified, the advantages of each broadcast ionosphere model are exerted, and the stability and consistency of system positioning are improved; dynamic environment change is supported, and good space-time adaptive capacity is achieved; and model selection is realized only at a user side without modifying the broadcasting format of the existing satellite message.

The embodiment of the present application provides a signal decoding method, device and electronic equipment, when signal decoding is performed, a first coherent integration corresponding to a first branch of a pilot component in a to-be-tracked signal and a second coherent integration corresponding to a second branch of the to-be-tracked signal, and a third coherent integration corresponding to the first branch of a data component in the to-be-tracked signal and a fourth coherent integration corresponding to the second branch of the to-be-tracked signal can be acquired respectively; and according to the first coherent integration, the second coherent integration, the third coherent integration and the fourth coherent integration, a navigation message is determined from the data component to decode the data component, avoiding the dependence on a previous coherent accumulation result and a previous decoding result, so that even if a previous decoding error of the navigation message, the whole bit stream will not be reversed, thereby effectively improving the accuracy of the decoding result.

The invention discloses a differential broadcast telegraph text integration method for a Roland time service system. The method comprises the following steps: extracting differential correction parameters of differential stations in a broadcast station coverage area within a preset time period; obtaining a plurality of differential correction values of each differential station in a preset time period; grouping all the differential stations according to the differential correction deviation of the differential stations; determining the newest statistical average value of each differential station in an updating period of a differential correction parameter; for each group, determining all statistical average values of each group based on the latest difference correction difference value of each difference station; obtaining a differential correction parameter of each group according to all statistical average values of each group; and loading the differential correction parameter of each group, the latest statistical average value of each differential station in the group and the data age of the differential correction parameter of the group into a broadcast message for broadcast. According to the invention, the space occupied by the differential telegraph text is saved, the time consumed for broadcasting the differential telegraph text is reduced, and the actual service life of the differential correction parameter is prolonged.

The invention discloses a positioning method for active interference of navigation signals in a complex site environment, comprising: obtaining satellite telegrams sent by positioning satellites and storing them in telegram data groups, calculating the Poisson distribution probability of the average length of null value runs based on the obtained satellite telegrams, judging whether the navigation signal is interfered with, if there is interference, adjusting the sampling period and generating a positioning optimization signal, constructing an active interference monitoring model based on the positioning optimization signal, determining the interference frequency range and storing it in a data group, adjusting the frequency receiving range of the navigation device based on the interference frequency data group, analyzing the adjusted telegram data group to obtain the available value of the frequency band, comparing it with a threshold value to judge whether the satellite positioning signal is available, marking the unavailable frequency band, and continuing to adjust to the available frequency band. The invention also relates to related computer equipment and storage media, which are conducive to solving the problem of active interference positioning of navigation signals in complex sites.

The application provides an optimization method of a Beidou satellite navigation signal acquisition algorithm based on modulation code polarity compensation, aiming at greatly reducing the operation complexity and operation time of the polarity compensation algorithm in the multi-period acquisition algorithm under multiple modulation types without affecting the acquisition accuracy. The application widens the coherent accumulation time and introduces a fast polarity compensation technology for the text information, uses the modulation code to perform coherent accumulation operation on the matching filter operation result, finds the coherent accumulation operation result with the maximum peak value, and extends the fast polarity compensation method to other Beidou satellite signals, compares the peak-to-peak ratio of the coherent accumulation operation result of each carrier frequency with a threshold value, and if the peak-to-peak ratio is greater than the threshold value, the corresponding carrier frequency is confirmed as the real carrier frequency of the intermediate frequency navigation satellite signal. The application expands the application field of the algorithm and improves the accumulation efficiency of the multi-period coherent accumulation.

The application provides a carrier phase polarity determination method and device, a chip and electronic equipment. The method comprises the following steps: determining the polarity of a frequency point of a satellite signal; determining whether the frequency point is stably tracked in the case that the polarity of the frequency point is invalid; determining whether the frequency point has a cycle slip in the case that the frequency point is stably tracked; and modifying the polarity of the frequency point as valid in the case that the frequency point has no cycle slip. In the case that the polarity of the frequency point is determined as invalid for the first time, in order to avoid misjudgment, the stable tracking condition and the cycle slip condition of the frequency point are determined again, and the polarity of the frequency point is modified as valid in the case that the frequency point is stably tracked and has no cycle slip, so that the carrier observation value is continuous. The application can better maintain the polarity of the carrier phase, reduce the problem of invalid polarity caused by high navigation message error rate, and improve the continuity and availability of the carrier phase.

Provided in the embodiments of the present disclosure are a terminal position determination method, an apparatus, a device and a storage medium. The terminal position determination method is applied to a terminal, and comprises: receiving a navigation signal and a communication broadcast signal broadcast by an access device; on the basis of the received navigation signal or communication broadcast signal, determining a plurality of frequency offset estimated values; on the basis of the received communication broadcast signal, acquiring first position-related information of the access device; on the basis of the first position-related information and the plurality of frequency offset estimated values, determining initial position information of the terminal; on the basis of the received navigation signal, acquiring a navigation message; on the basis of the navigation message, acquiring second position-related information of the access device; and using the second position-related information to update the initial position information, so as to obtain position information of the terminal.

The present application discloses a satellite screening method, device, equipment and medium based on device positioning, which relates to the field of aerospace technology, and includes: obtaining orbital satellites whose broadcast information is the target message and the elevation angle meets the preset angle condition based on the Beidou satellite navigation system, and using the orbital satellites to determine the target satellites; wherein, the target message includes B-CNAV1 message and / or B-CNAV2 message; judging whether the message content corresponding to the target satellite that receives the navigation message meets the preset availability condition; if the message content corresponding to the target satellite that receives the navigation message meets the preset availability condition, determining the space signal accuracy based on the message data in the message content, and using the target satellite whose space signal accuracy meets the preset accuracy condition as the satellite for device positioning calculation; the message content includes the target message. Screening the satellites participating in the positioning calculation to ensure the accuracy of the navigation data.

The invention discloses a low earth orbit satellite opportunity signal pseudo range difference observed quantity processing method and system. The method comprises the following steps: receiving a plurality of low earth orbit satellite opportunity signals and obtaining a baseband opportunity signal corresponding to each low earth orbit satellite opportunity signal; performing sliding correlation on the synchronous code sequence signal and a baseband opportunity signal corresponding to each low-orbit satellite opportunity signal to obtain synchronous code arrival time corresponding to each low-orbit satellite opportunity signal; and carrying out difference on the synchronous code arrival time corresponding to different low-orbit satellite opportunity signals, and determining a pseudo-range difference observed quantity between the different low-orbit satellite opportunity signals. According to the invention, the technical problem that the low-earth-orbit satellite opportunity signal cannot be fully utilized due to the unknown navigation message format of the low-earth-orbit satellite opportunity signal in the prior art is solved, the problem that the navigation message format of the low-earth-orbit satellite opportunity signal is unknown is solved, available ranging information is obtained, and the user experience is improved. The technical effect of more fully utilizing the opportunity signal of the low-orbit satellite is achieved.

The present application belongs to the field of positioning and navigation technology, and provides a kind of ultra-wideband positioning signal transmission method with narrowband communication signal tight coupling, including a kind of narrowband signal coupling ultra-wideband signal design method and a kind of communication information assisted positioning service process.Based on the narrowband assisted ultra-wideband signal designed and transmitted based on the method, the characteristic is that the ultra-wideband positioning signal is time-domain tightly coupled with the narrowband communication signal, and the narrowband communication signal can be used to realize the functions of wake-up, access control and other functions of ultra-wideband radio terminal, and can also transmit channel impulse response, navigation text and other information.Compared with the traditional ultra-wideband positioning system, more flexible terminal access mechanism can be realized, and the user capacity of the positioning base station is improved, which can be used on the ultra-wideband positioning base station and terminal with ranging and angle measurement capability.

A method, apparatus, and storage medium for estimating the carrier-to-noise ratio (CNR) of a digital navigation signal are disclosed. The method includes: preprocessing a digital navigation signal to obtain a first in-phase component signal and a first quadrature component signal; removing modulation messages from the first in-phase component signal and the first quadrature component signal to obtain a second in-phase component signal and a second quadrature component signal; accumulating the second in-phase component signal and the second quadrature component signal to obtain the power of the second in-phase component signal and the power of the second quadrature component signal; performing a reliability estimation of the signal amplitude based on the power of the second in-phase component signal and the power of the second quadrature component signal, and the current phase-locked loop (PLL) state, to obtain an amplitude estimation result; and estimating the CNR of the digital navigation signal under the current PLL state based on the amplitude estimation result.