15 results about "GLONASS" patented technology

The invention discloses a GPS / GLONASS inter-frequency clock deviation modeling and forecasting method and device, and the method comprises the steps: obtaining positioning data received by a receiver from a satellite, and constructing a geometric-free ionosphere-free phase combination observation value according to the positioning data; an inter-epoch difference method is adopted to remove ambiguity constants absorbing phase hardware delay time invariants in the geometry-free ionosphere-free phase combinations, and a single observation station ionosphere-free combination IFCB is obtained; integrating observation data of multiple observation stations, and calculating a final IFCB deviation by adopting a multi-station weighted average mode; according to the IFCB data, carrying out harmonic analysis by adopting fast Fourier transform to obtain an accurate period of an IFCB sequence, and proposing an IFCB model based on a third-order polynomial and a seven-period harmonic function; and performing experiment forecasting according to the IFCB time sequence model, extracting and comparing periodic characteristics of IFCB deviation, and calculating an optimal forecasting period. According to the method, the observation data of the GPS / GLONASS system can be corrected in real time, so that the positioning result is accurately corrected to improve the positioning accuracy.

The application relates to a miniaturized satellite navigation receiver, which receives three constellation navigation satellite signals of GPS, GLONASS and BD second-generation B1 through a first electric connector, receives a BD second-generation B3 constellation navigation satellite signal through a second electric connector, and respectively carries out filtering, frequency mixing and down conversion to a baseband, and through an A / D analog-digital converter, the down-converted analog-digital conversion is sent to an FPGA; the FPGA realizes capturing and tracking of the above three navigation signals, and after frequency domain narrowband interference resistance processing of another frequency point navigation signal, the FPGA realizes capturing and tracking again, the FPGA sends demodulated original data to a DSP, the DSP carries out navigation calculation, and a data stream is transmitted through an interface circuit, the receiver realizes reduction of the volume of the satellite navigation receiver, realizes miniaturized design, has strong anti-interference capability, the FPGA has large design resources, and the performance of the satellite navigation receiver is greatly improved.

Disclosed in the present invention is a safety separation progressive decision tree-based unmanned aerial vehicle conflict prediction method, comprising: establishing an unmanned aerial vehicle safety separation parameter library; establishing a coordinate transformation model parameter library for transforming a WGS-84 coordinate system or a GLONASS-PZ90 coordinate system to a CGCS2000 coordinate system, and encapsulating a constructed Bursa-Wolf model into a coordinate transformation function; parsing flight dynamics data and performing standardized transformation; performing airspace-based unmanned aerial vehicle conflict prediction, and classifying prediction results by conflict risk level into a monitoring dataset, a close-monitoring dataset, and a warning-alert dataset; and calculating the time for an unmanned aerial vehicle pair in the close-monitoring dataset to potentially reach a warning-alert level, and calculating the estimated time to collision for a conflicting unmanned aerial vehicle pair in the warning-alert dataset. The present invention can maximize space resource utilization in an airspace, thereby effectively increasing the air traffic flow within the airspace.

The invention relates generally to the radio navigation field and may be applied to design of Global Navigation Satellite System (GNSS) Receivers, and particularly of GNSS GPS (USA), Galileo (EU), Glonass (Russia), Beidou (China), QZSS (Japan), IRNSS (India), and augmentation systems SBAS (different states). In the invention, the function of generating various PRN codes is repositioned from numerous tracking channels of multi-frequency, multi-constellation GNSS receiver to a shared PRN code generator unit, which serves in series all tracking channels. Such centralization of the PRN codes generation function enables a significant complexity reduction when the GNSS receiver includes a great number of tracking channels. A sufficient speed performance of the shared PRN code generator is achieved due to transfer of the PRN code lines from the shared PRN code generator to the receiver tracking channels via a dedicated parallel bus. Speed performance requirements to the dedicated parallel bus of the shared PRN code generator is kept moderate by a special number of symbols choice of PRN code lines thus providing uniformity of tracking channels requests to get new code lines. Use of several alternate means of PRN code lines forming: PRN Code ROM, PRN Code RAM, LFSR-based and one-shot PRN code generators—permits choosing optimal generation means for each type of GNSS signals.

A repeater for wireless communications systems can include a time-division-duplex (TDD) architecture with a timing recovery system for switching between uplink and downlink. In some approaches, the timing recovery system can receive a timing reference from a global navigation satellite system (GNSS) such as Global Positioning System (GPS), Global Navigation Satellite System (GLONASS), or Galileo.

The embodiment of the present disclosure provides a GLONASS system pseudo-range observation calibration method, device, receiver and storage medium, the GLONASS system pseudo-range observation calibration method comprises: obtaining the frequency point and channel number of the original pseudo-range observation; determine the inter-frequency code bias corresponding to the frequency point and channel number of the original pseudo-range observation; according to the inter-frequency code bias determined, the original pseudo-range observation is calibrated, and the calibrated pseudo-range observation is output.The present disclosure can make the GLONASS inter-frequency code bias of all receivers in a reference station network consistent, and also make the GLONASS inter-frequency code bias of receivers of any brand consistent, thereby improving the positioning accuracy of network RTK or PPP service.

The utility model provides a satellite signal separation circuit, a chip and a receiver, relates to the technical field of satellite communication, and can separate satellite signals of each satellite navigation system from mixed satellite signals. The satellite signal separation circuit comprises a hybrid satellite digital signal input end, a first band-pass filter, a second band-pass filter, a third band-pass filter and a satellite signal processing circuit, and the first band-pass filter is used for separating GPS satellite digital signals in hybrid satellite digital signals. The second band-pass filter is used for separating Beidou satellite digital signals in the mixed satellite digital signals, and the third band-pass filter is used for separating GLONASS satellite digital signals in the mixed satellite digital signals; the hybrid satellite digital signal input end is electrically connected with the first band-pass filter, the second band-pass filter and the third band-pass filter respectively; the first band-pass filter, the second band-pass filter and the third band-pass filter are electrically connected with the satellite signal processing circuit.

The invention relates to the field of satellite radio navigation measurement and positioning, and discloses an unmanned aerial vehicle defense system and method based on multimode navigation decoy. Comprising a situation acquisition module, a strategy management module, a multi-constellation decoy parameter solving module, a decoy signal synthesis and emission module, a confinement control module, an effect evaluation module and a closed-loop scheduling module. Based on a target state sequence and a deception target parameter, solving a deception parameter set of the GPS, the Beidou and the GLONASS, applying cross-constellation time reference consistency, pseudo-range continuity and trajectory smoothness constraints, and transmitting a satellite radio navigation deception signal in a limited sector and a power upper limit, and according to the decoy effect evaluation quantity, triggering updating and executing continuity protection on the code phase, the carrier frequency and the carrier phase.

The invention discloses a method and system for triggering alarm clock reminding based on a geographic position, and relates to the technical field of geographic information. According to the method and system for triggering alarm clock reminding based on the geographic position, the current position information of a user is obtained in real time through a terminal, the time for arriving at a destination is calculated in combination with a movement route and a movement speed, and when the detected time is within a preset reminding range, a reminding function is activated. The core of the method is that positioning data provided by a GPS, Beidou, Galileo, Glonass and the like are obtained, a motion path is calculated, time prediction is carried out, a multi-sequence priority system is set as a trunk by taking a previous driving route and driving time data as a benchmark, and time prediction is carried out. A double verification process, a priority level increasing system and a priority level adjusting system are formed in combination with a geofence, and a more accurate and diversified reminding function is given; the system supports cross-equipment linkage synchronous reminding, and is suitable for anti-sitting and station-crossing early warning in travel scenes such as public transportation, online car hailing, factory and enterprise regular buses and self-driving navigation.

The embodiment of the application discloses a method for processing pseudorange inter-frequency bias in a GLONASS system. The method is applied to a multi-GNSS system, and the method comprises the following steps: when an observation environment meets a preset condition, obtaining position information of a mobile station by using non-GLONASS system satellite observations; obtaining pseudorange single-difference values of each GLONASS satellite by using the position information of the mobile station and pseudorange observations of each GLONASS common-view satellite of the mobile station and a base station; calculating pseudorange double-difference values of each GLONASS satellite except for a selected GLONASS reference satellite, and further determining the pseudorange inter-frequency bias values of each satellite in the GLONASS system; obtaining stable pseudorange inter-frequency bias values of each GLONASS satellite by filtering; and when the observation environment is poor, compensating the pseudorange inter-frequency bias values of the GLONASS satellites and then participating in positioning, so as to improve the pseudorange differential positioning performance.

A claim for protection is being asserted for: • A compact all-in-one outdoor station in an outdoor housing for mast or wall mounting, which detects GNSS interference (interference, jamming, or spoofing) via a receiving antenna on the L1 band, analyzes the GPS, Galileo, Beidou, and Glonass constellations, classifies detected interference as interference, jamming, or spoofing, calculates an interference level, and automatically generates a NOTAM message based on the type and level of interference, encodes this message as FIS-B, and transmits the encoded message via UAT978 through the transmitting antenna on the 978MHz frequency.

The utility model relates to a GNSS positioning terminal, and belongs to the technical field of engineering measurement. The terminal comprises a mainboard, an STM32 core board, a screen module, a GNSS module and a rotary encoder. A core board interface, a USB female seat, a GNSS module interface and a rotary encoder interface are welded on the mainboard; the STM32 core board is electrically connected with the main board through the core board interface, the screen module is electrically connected with the STM32 core board, the GNSS module is electrically connected with the main board through the GNSS module interface, and the rotary encoder is electrically connected with the main board through the rotary encoder interface. The mainboard disclosed by the utility model adopts a function partition integrated design, so that the cost is low, and the later maintenance is easier. The GNSS module disclosed by the utility model supports Beidou, GPS and GLONASS multi-system joint calculation, signal lock loss is effectively avoided, and the plurality of button contacts are matched with the plurality of buttons, so that the positioning efficiency and the data entry speed under complex terrains are improved.

The invention relates to a GLONASS signal capturing method, device and equipment and a medium. The method comprises the following steps: acquiring frequency division multiple access GLONASS signals of different satellites on different carriers; performing down-conversion and ADC sampling processing on the frequency division multiple access GLONASS signal in sequence to obtain intermediate frequency data with a sampling rate of 100MHz; the method comprises the following steps: dividing 100MHz intermediate frequency data into two paths of 100MHz signals I and Q, and performing speed reduction processing on the two paths of 100MHz signals I and Q by adopting a preset 9.198 MHz capture sampling rate to obtain two paths of signals I and Q with the sampling rate of 9.198 MHz; and I and Q signals of 9.198 MHz are cached to AEFIFO so as to capture any satellite to be captured. Through the method provided by the invention, satellite signals of all frequency points can be cached at one time for signal capture, so that the capture efficiency is greatly improved.

The invention discloses a GLONASS citizen code navigation signal generation type deception jamming method. The method comprises the following steps: acquiring a real signal ephemeris, acquiring a deception transmitting point position, and setting a deception target position and deception jamming signal parameters; generating a visible satellite navigation signal of a deception target position, and filling a spread spectrum signal consistent with a real signal in a corresponding frequency position of an invisible satellite or a civilian code navigation FDMA signal of which an ephemeris is not obtained; setting the power of the frequency point for generating the deception jamming signal to be a first preset threshold value greater than the power of the real satellite navigation signal, and setting the signal power of the filling frequency point to be a second preset threshold value greater than the power of the real signal; the generated deception jamming signal is transmitted at a set power, the target is set to deviate from the real position of the target to a preset position at a preset acceleration, and the generated deception jamming on the target is realized; the method has the characteristics of low efficiency power and high efficiency probability, and can improve the effectiveness of the generative deception jamming.

This invention discloses a signal analysis method and system for a real-time software receiver of the new GLONASS system signal, solving the technical problem that the signal analysis process of existing civilian GLONASS software receivers is difficult to meet the real-time requirements of software receivers in practical applications. The method includes acquiring the new GLONASS system signal and the local PRN code; preprocessing with a Doppler frequency table and a predefined number of sampling points to generate multiple sets of intermediate frequency signals; combining the local PRN code and the coherent integration duration acquisition signal to output the captured Doppler precision estimate; generating a baseband low-frequency signal and six sets of correlation results based on the resampled code library and other tracking signals; outputting code phase observations and five-domain signal quality indicators through signal analysis; outputting a valid navigation message through synchronous decoding such as CRC check; and finally, combining the message, indicators, etc., completing the positioning calculation based on the receiver's initial position approximation to output the receiver's final three-dimensional position.