82 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 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 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.

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 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 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.

The application discloses a kind of medium wave communication navigation integrated signal design method, comprising: generating frame synchronization code and navigation text;The binary code of navigation text is segmented according to fixed bit length, and segmented binary code is obtained;According to order, segmented binary code is two two as a group, and each group of segmented binary code is first converted into series / parallel, then BHC error correction coding is carried out respectively;For each group of BCH code, parallel / series conversion is carried out according to each bit order to output interleaved code, so as to complete the interleaving coding of navigation text;Interleaved coded navigation text and frame synchronization code are modulated using full hopping MPPSK modulation, framing is carried out, multiple frame signals are formed, the multiple frame signals are used to replace the sine carrier in broadcast signal, and composite modulation signal is generated by composite modulation with analog audio signal and transmitted through broadcast station.The application can realize the dual functions of broadcast and navigation without affecting the normal use of users.

The invention discloses a regional wireless high-precision time keeping and time service system and method, and relates to the field of time synchronization, and the system comprises a key display panel which is used for receiving a user instruction and displaying a state; the time frequency processing board receives a timing instruction, converts an external standard time source into a local 1PPS signal, provides the local 1PPS signal to the chip atomic clock for clock taming, and provides Beidou time and reference frequency for the navigation simulation board after time conversion; the navigation analog board is used for encoding and modulating navigation messages based on set signal generation parameters, Beidou time and reference frequency, generating analog Beidou navigation signals and sending the analog Beidou navigation signals to the transmitting antenna; the transmitting antenna is used for transmitting the simulated Beidou navigation signal to ground Beidou receiver equipment; the power supply module performs power supply conversion on the battery; and the comprehensive control board performs data interaction and state power consumption management. According to the invention, rapid and efficient timing of the Beidou user equipment is realized in a wireless broadcast mode, and the time service system has long endurance time-keeping days and high time-keeping precision.

The invention relates to an ultra-wideband navigation signal generation method and device based on linear frequency modulation spreading codes, and belongs to the technical field of satellite navigation. The method comprises the following steps: generating a linear frequency modulation spreading code of a data / pilot branch by using a phase quantization model meeting collaborative optimization constraints of generation complexity and sidelobe suppression performance; generating a pseudo-random spreading code of the data / pilot branch; generating a data code containing a navigation message; according to the pseudo-random spreading code and the linear frequency modulation spreading code of the pilot frequency branch, generating a digital baseband signal of the pilot frequency branch and performing digital-to-analog conversion; according to the data code and the pseudo-random spreading code and the linear frequency modulation spreading code of the data branch, generating a digital baseband signal of the data branch, and performing digital-to-analog conversion; and generating a complete ultra-wideband navigation signal according to the analog baseband signal of the data / pilot frequency and the radio frequency carrier. According to the method, the generation complexity of the ultra-wideband navigation signal can be greatly reduced, and a key technical support is provided for the application of the ultra-wideband navigation signal.

The present invention discloses a method and device for monitoring the real-time correction loop of enhanced positioning SSR, which belongs to the field of satellite navigation positioning technology. The method includes performing quality monitoring on the base station data through the SSR correction parameter estimation monitoring terminal, generating a data source link quality identifier Q‑I; performing accuracy comparison and availability monitoring on the self-estimated SSR correction product and the third-party service agency product through the SSR correction product monitoring terminal, generating a product information source link quality identifier Q‑II; simulating user positioning scenarios with different accuracy requirements through the SSR correction product service monitoring terminal, generating a product service link quality identifier Q‑III; encoding the quality identifiers Q‑I, Q‑II and Q‑III into the SSR telegram at the SSR recoding terminal for broadcasting. The present invention allows the operating system to provide hierarchical services to ensure the needs of different users.

The application provides a navigation satellite message autonomous integrity monitoring method, which comprises the following steps: calculating first state information at a predetermined time through extrapolation based on historical navigation message parameters of an on-board message, and calculating second state information according to navigation message parameters of a new on-board message on the predetermined time, calculating a first difference between the two; obtaining regional system signals and global system signals on the same time, and calculating corresponding state information and a second difference between the state information; judging whether the first difference and the second difference exceed corresponding alarm thresholds, and if both exceed, generating an alarm information of the message integrity. Thus, the application can realize on-board message autonomous integrity monitoring, can monitor and alarm abnormalities of the message caused by uplink injection, malicious tampering and the like, and prevent error positioning results caused by the error message broadcast to the ground users.

The present invention relates to a method for satellite expansion support of a GNSS navigation receiver, including: obtaining information of newly added satellites; calculating the current code phase estimation value and Doppler frequency estimation value of the newly added satellites according to the information of the newly added satellites; inputting the current code phase estimation value and Doppler frequency estimation value of the newly added satellites into a tracking engine, and adjusting the control parameters of the tracking engine according to the search ranges of the code phase and Doppler frequency to capture and track the signals of the newly added satellites; decoding the telegrams of the newly added satellites to obtain the broadcast ephemeris of the newly added satellites, and then performing positioning calculation on the newly added satellites in combination with the observation quantities obtained by the tracking engine. The present invention realizes the support for newly added satellites without re-designing and tape-out, greatly reducing the receiver cost.

The application relates to a GNSS high-sensitivity acquisition method and equipment applied to a deep space spacecraft. The core process of the method is as follows: the time and corresponding position of receiving GNSS signals by the spacecraft are acquired, the satellite position at the receiving time is calculated by combining the pre-stored target satellite orbit information, and the signal transmission time is obtained through iterative correction; the starting time of digital intermediate frequency data storage is determined according to the subframe period of the navigation message, so that the key specified bits of the message are completely contained, and the navigation message is stripped by using the fixed and predictable bits; the Doppler center frequency offset is obtained by calculating the relative speed of the line-of-sight direction between the star and the earth, the search range is determined by combining the speed uncertainty, the signal acquisition is completed in the limited range, and the code phase and the carrier frequency offset are solved. The application is suitable for the scene that the deep space signal is weak, the propagation time delay is long, and the Doppler characteristic is complex, the position mismatch error is avoided through iterative correction, a high-precision time reference is acquired, and the GNSS signal acquisition performance is significantly improved.

The invention belongs to the technical field of global navigation satellite system integrity monitoring, and discloses a Beidou CNAV telegraph text space signal integrity evaluation method and system. The method comprises the following steps: firstly, respectively screening obtained Beidou CNAV messages and post precise ephemeris to obtain available ephemeris; taking a precision satellite orbit and a precision satellite clock after the event as a reference, resolving a CNAV satellite clock error and a CNAV satellite orbit error in an observation period, and further calculating to obtain a worst user distance measurement error of a Beidou CNAV telegraph text space signal; and estimating the fault rate and the average fault duration of the Beidou CNAV telegraph text space signal by using the worst user ranging error large sample data set of the CNAV telegraph text space signal and adopting a confidence test iteration method. The method can provide key technical support for integrity evaluation of the Beidou system.

The invention discloses a channel prior information-oriented observed quantity anomaly detection system and a detection method thereof, and the detection system comprises a baseband signal-based anomaly detection module and an observed quantity-based detection module. Wherein the baseband signal-based anomaly detection module is used for performing preliminary anomaly detection on a signal which is sent by a satellite and is not subjected to telegraph text demodulation, and the baseband signal-based anomaly detection module needs to perform feature quantity extraction and detection on a captured and tracked signal so as to classify the captured signal; and the abnormal detection module based on the observed quantity is used for carrying out abnormal information detection on the observed quantity obtained by carrying out telegraph text demodulation on a satellite emission signal on the basis of previous-stage detection, so that abnormal signals are eliminated, and the reliability of output information is ensured.