57 results about "GLONASS" patented technology

Three-dimensional outdoor positioning can be considerably enhanced by using various 3D imaging techniques, LiDAR ranging measurements of surrounding landmarks, and Inertial Measurement Units (IMUs) reaching accuracies in the centimetres range. These technologies, in conjunction with global navigation satellite systems (GNSS) such as GPS, GLONASS, Galileo, and BeiDou, provide autonomous geo positioning. It is crucial to acknowledge the constraints of dead reckoning, which may result in mistakes in positional precision. Integrating modern imaging and correction techniques can significantly improve the accuracy and dependability of outdoor localisation. The amalgamation of various 3D imaging methodologies with LiDAR enhancements improves the comprehension and ranging of the environment, tackling the difficulties presented by GNSS constraints. The integration of IMUs with satellite systems ensures the provision of continuous traveling positioning data, even in instances of obscured or faulty satellite signals. This comprehensive approach improves outdoor location precision and expands the use of these technologies across other domains, such as autonomous navigation, robotics, and geospatial analysis, resulting in more effective and dependable positioning solutions. The hardware system consists of a swarm of sensors, including GNSS, INS, IMU, LiDAR, stereo imaging, and RGB technologies, which are combined to generate three-dimensional colored representations of natural landscapes and urban environments. This system reconstructs topographical features, enabling detailed mapping and analysis. It produces comprehensive three- dimensional sensory data, including geo-location and POI identification, and incorporates advanced image processing techniques, such as edge detection, for precise spatial awareness and environmental understanding. The system is designed with a compact form factor, making it easily integrated into wearable devices and autonomous vehicles. The integration of these technologies forms a sophisticated network of swarm intelligence, crucial for autonomous vehicle positioning and navigation. Particle swarm optimization (PSO) is used to address non-deterministic navigation, with different coupling fusion methods available. The Neuro-fuzzy PSO AI Positioning and Navigation System generates three-dimensional sensory data, providing detailed information about geographical distribution and dead reckoning areas.

A method and apparatus for mitigation of GNSS-signal interference using an adaptive notch filter (ANF) operates based on signals received from one or more satellites of a Global Navigation Satellite System (GNSS) such as GPS, GLONASS, etc. In one embodiment, an apparatus comprises a notch filter having a tunable zero frequency of a transfer function receives an input signal and generates an output signal. A bandpass filter coupled to the output of the notch filter receives the output signal. An adaptive block is coupled to the bandpass filter and adjusts the notch filter parameters in order to achieve the minimization of a specific cost function.

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 invention discloses a microwave array accurate positioning method based on a radio frequency signal. The method comprises the following steps: S1, receiving navigation satellite signals from a BDS system, a GPS system and a GLONASS system; s2, the received GNSS signals are preprocessed; s4, performing enhancement processing on the weak signal; s5, performing fusion processing on the main lobe signal, the side lobe signal, the strong signal and the weak signal by using a multi-signal fusion algorithm; s6, a microwave array antenna is installed on the spacecraft; s7, fusing a microwave array positioning result with a positioning result of the multi-constellation combined navigation system by using a position calculation and correction algorithm; s8, transmitting a positioning result to a ground control center through a data transmission module; and S9, according to the signal strength and the positioning precision monitored in real time, weak signals are effectively enhanced by adopting adaptive beam forming and spatial filtering technologies, noise interference is suppressed, and the system can stably work in a complex environment.

The invention belongs to the technical field of satellite navigation, and particularly relates to a Beidou terminal performance closed-loop test system and method, and the system comprises a multi-system GNSS navigation signal simulation source which is used for simulating a test signal and evaluating the core performance of a navigation terminal in real time; the Beidou RDSS and short message test system is used for simulating RDSS outbound signals and completing capturing, tracking, analysis and parameter measurement of RDSS inbound signals; the satellite navigation signal forwarding system is used for receiving satellite signals and completing work such as machine testing, system debugging, time service and positioning; the portable data acquisition and playback system is used for acquiring four signals, namely, a BDS signal, a GPS signal, a GLONASS signal and a Galileo signal; and the microwave anechoic chamber is used for providing a wireless shielding test environment, supporting the rotary table to spin and simulating the running state of the missile-borne receiver. According to the invention, the comprehensive testing of the basic function performance of various navigation products, such as passive positioning, active positioning, position report and short message, can be realized, and the method has a good market application prospect.

The invention discloses a global lake wind speed estimation method based on a BDS / GPS / GLONASS / Galileo reflected signal of a China Tangyu No.1 satellite-borne, which comprises three modules, the global lake data extraction module is based on reflection measurement of four systems (BDS / GPS / GLONASS / Galileo) of a temmoku No.1 constellation, the module is used for screening relevant important feature variables of global lake wind speed inversion through a machine learning algorithm and calculating input feature importance values through an SHAP, and the module is used for constructing a global lake water surface wind speed inversion model. According to the method, the quantitative result of global lake wind speed inversion through satellite-borne BDS / GPS / GLONASS / Galileo reflected signals of the Tangyu No.1 constellation is achieved for the first time, the lake wind speed inversion precision is improved by adopting a machine learning method, and the huge potential of satellite-borne GNSS-R in inland water body wind speed monitoring is powerfully promoted.

The invention relates to the technical field of security and protection equipment, and discloses a portable multi-mode intelligent alarm terminal based on Beidou positioning, which comprises a Beidou third-generation positioning module, a multi-mode communication module, a dual-mode power supply system, a physical key assembly, a central processing unit and a sensor array, the Beidou third-generation positioning module supports BDS / GPS / GLONASS multimode fusion positioning, the positioning precision is less than or equal to 1m (in an outdoor enhancement mode), and the multimode communication module integrates 4G / 5G data communication, Beidou short message transmission and Bluetooth LE near field communication functions. According to the invention, through Beidou third-generation / GPS / GLONASS multimode fusion positioning, the Kalman filtering algorithm and the signal-to-noise ratio dynamic weighting technology are combined, and the outdoor positioning precision of less than or equal to 1m is realized. When a satellite signal is shielded, an inertial navigation mode is automatically switched to, a trajectory is corrected by utilizing data of a triaxial accelerometer, and an accumulative error is controlled within 5m / min. Through actual measurement, the positioning success rate in the urban canyon environment reaches 98% and is improved by 40% compared with that of a traditional single-mode GPS terminal, and it is ensured that rescue force quickly and accurately arrives at the site.

The invention discloses an unmanned aerial vehicle conflict prediction method based on a safety interval progressive decision tree. The method comprises the following steps: establishing an unmanned aerial vehicle safety interval parameter library; the method comprises the following steps: establishing a coordinate conversion model parameter library for converting a WGS-84 coordinate system and a GLONASS-PZ90 coordinate system into a CGCS2000 coordinate system, and packaging a constructed Boolea model into a coordinate conversion function; analyzing the flight dynamic data and performing standardized conversion; airspace type unmanned aerial vehicle conflict prediction is carried out, and prediction results are divided into a to-be-observed data set, a focus attention data set and an alarm prompt data set according to conflict risk levels; calculating the time when the unmanned aerial vehicle pair in the focus attention data set possibly reaches the alarm prompt level; and calculating the predicted collision time of the conflicting unmanned aerial vehicle in the alarm prompt data set. According to the method, the maximum utilization of airspace resources can be realized, and the flight flux in the airspace is effectively improved.

The invention discloses a satellite navigation simulator with settable frequency points, which is used for function test in an automatic test process of a satellite navigation receiver and comprises a satellite navigation signal forwarding part and a time service part. The navigation signal simulation function is realized by adopting a same-frequency forwarding mode, in the same-frequency forwarding mode, satellite navigation signals of GPS, Beidou and GLONASS are received through a satellite receiving antenna, and after being filtered and amplified, the satellite navigation signals are radiated to a tested object through a transmitting antenna or transmitted to a satellite receiver of the tested object through a high-bandwidth interface. P code and C code satellite signal forwarding and satellite receiver P code and C code positioning function testing can be realized. Meanwhile, the built-in satellite navigation receiver resolves the navigation signal in real time and sends the resolved positioning data to the upper computer to judge the effectiveness of the simulated navigation signal. In the aspect of a time service function, the device has the functions of time service output, 1PPS output and ephemeris data output, and is used for assisting in completing a P code direct capturing function test of a P code receiver.

The invention provides a miniaturized double-antenna navigation signal processing board card. Comprising a first radio frequency signal processing module, a second radio frequency signal processing module, a first four-channel navigation module, a first navigation signal processing module, a second four-channel navigation module, a second navigation signal processing module, an external communication interface, a first clock module, a second clock module, a first power supply module and a second power supply module. According to the invention, independent processing of two paths of radio frequency input signals is realized, one path with higher intensity can be independently selected, weakening or interruption of a navigation signal caused by shielding of a certain antenna is effectively dealt with, and the reliability of the navigation signal is improved; according to the invention, navigation signal processing of multiple frequency points of 1.2 GHz, 1.5 GHz and the like under Beidou, GPS, GLONASS and GALILEO navigation systems is realized, and the design is also suitable for receiving navigation signals of multiple frequency points of 1.6 GHz and the like by selecting the models of the first surface acoustic wave filter, the second surface acoustic wave filter and the third surface acoustic wave filter in the radio frequency signal processing module.

The invention relates to the technical field of construction surveying and mapping, and provides a surveying and mapping instrument for building engineering construction, which comprises a laser scanning unit which comprises a polygon prism rotary scanning mechanism and a galvanometer system and is used for emitting laser beams with the wavelength range of 800-1600nm and generating three-dimensional point cloud data of a target area, and the adjustable range of the scanning frequency is 10-200Hz; the GPS positioning unit is integrated with a dual-frequency RTK differential module, supports Beidou / GPS / GLONASS multi-system positioning, obtains space coordinates (x, y, z) of a surveying instrument in real time, the positioning error is less than or equal to 2cm, and synchronizes differential data with a base station through a 5G network, the data delay is less than 50ms, and the environment sensor unit comprises a temperature and humidity sensor, an illumination sensor and a laser radar haze detection module. Under the haze condition, the image definition Q can be improved by 45%, the data stability can be improved by 60% when temperature and humidity fluctuate, the GB / T50328-2019 surveying and mapping precision AA-level standard is met, the automatic recognition rate of abnormal points is larger than or equal to 98%, the path planning time is shortened to be within 5 seconds, and the comprehensive surveying and mapping efficiency is improved by 35%.

The invention discloses a GNSS multi-system robust adaptive fusion RTK solution method, comprising the following steps: step 1: establishing a conventional RTK double-difference observation equation according to the BDS / GPS / GLONASS / GLILEO multi-system observation data of the base station and the mobile station; step 2: conventional Kalman filter solution; step 3: robust Kalman adaptive filter estimation; step 4: BDS / GPS / GLONASS / GLILEO multi-system fusion Helmert variance component estimation; step 5: BDS / GPS / GLONASS / GLILEO multi-system RTK ambiguity fixation. The invention can effectively reduce the influence of the inaccurate prior random model of GNSS positioning, the abnormal observation and the abnormal dynamic model on the multi-system fusion RTK positioning, improve the positioning accuracy of the GNSS (BDS / GPS / GLONASS / GLILEO) multi-system fusion RTK, and make the RTK positioning result more stable and reliable in complex environments.

1. Name of the Design Product: Geodetic GNSS Receiver (M50). 2. Use of the Design Product: This design product is used to receive and externally provide the position and observation information of satellites in global satellite navigation systems such as Beidou, GPS, Galileo, and GLONASS, and is a satellite navigation and positioning terminal device integrating satellite positioning, data storage, and communication transmission. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective view.

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 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.

The utility model provides a reservoir and dam integrated safety research and judgment system, which relates to the technical field of dam safety research and judgment and is arranged on a dam body between a reservoir area and the downstream of the dam body. The safety studying and judging system comprises a plurality of safety monitoring devices, an osmotic pressure monitoring device used for measuring pore water pressure, a dam foundation seepage monitoring device used for monitoring dam foundation seepage and a Beidou displacement monitoring device used for monitoring dam body displacement, and the safety monitoring devices are arranged at the top end of a dam body. The safety monitoring device has rainfall monitoring and water level monitoring functions, the seepage pressure monitoring device is vertically buried in a dam body, the dam foundation seepage monitoring device is arranged at the junction of the downstream of the dam body and the dam body, and the Beidou displacement monitoring device is arranged at the top end of the dam body. The satellite data of the BD / GPS / GLONASS is acquired through a GNSS (Global Navigation Satellite System) antenna; the GNSS receiver is connected with the network antenna through a radio frequency cable, and the network antenna carries out the data receiving and transmitting of the whole Netcom frequency band.

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.

The invention provides Beidou / GNSS (Global Navigation Satellite System) area enhancement and meteorological service integrated terminal equipment and a high-precision positioning method. Relates to the technical field of satellite navigation positioning and meteorological information service, and comprises a multi-constellation multi-frequency signal receiving module which is used for receiving Beidou No.3, GPS, GLONASS and Galileo satellite navigation signals and Beidou PPP-B2b satellite-based enhancement signals at the same time and outputting unified time stamps. According to the Beidou / GNSS area enhancement and meteorological service integrated terminal equipment and the high-precision positioning method, multiple satellite navigation systems are integrated, and Beidou PPP-B2b satellite-based enhancement signals are received at the same time, so that multi-source and multi-band high-precision observation data are formed. Through parallel access to a cellular network, satellite communication and a local area network, effective acquisition and processing of foundation NRTK differential flow, Internet PPP-RTK correction flow and real-time meteorological messages are realized. And in combination with a self-adaptive fusion positioning calculation module, RTK or PPP-RTK calculation is preferentially adopted when a foundation link is normal, so that continuous centimeter-level high-precision positioning in different communication environments is realized.

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 present invention discloses a satellite positioning data acquisition device, including an aviation antenna, arranged inside an aircraft, for receiving half-satellite signals of GPS, GLONASS, and BDS; a GNSS receiving device, one end of which is connected to the aviation antenna, for processing the half-satellite signal received by the aviation antenna, and converting the half-satellite signal from an analog signal to a digital signal; a GNSS data fusion processing device, connected to the GNSS receiving device, receiving and storing the digital signal sent by the GNSS receiving device, processing the digital signal to obtain the half-satellite data of the flight process; combining the ground satellite data with the half-satellite data, and calculating the position information during the flight. The present invention is easy to deploy, has a simple installation method, and has a low device cost, and can achieve centimeter-level positioning accuracy of the aircraft, and can be widely used in aircraft produced by major equipment manufacturers.

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.

The present invention discloses a method for estimating the global lake wind speed using reflected signals of BDS / GPS / GLONASS / Galileo on the Chinese Tianmu-1 satellite, which includes three major modules, namely, a global lake data extraction module based on the reflected measurements of the four systems (BDS / GPS / GLONASS / Galileo) of the Tianmu-1 constellation, a module for screening important characteristic variables related to the inversion of the global lake wind speed by machine learning algorithms and calculating the importance values of input features by SHAP, and a module for constructing an inversion model of the global lake surface wind speed. The present invention has for the first time achieved quantitative results of inverting the global lake wind speed using the reflected signals of BDS / GPS / GLONASS / Galileo on the Tianmu-1 constellation, and adopted machine learning methods to improve the accuracy of lake wind speed inversion, which strongly promotes the great potential of spaceborne GNSS-R in the wind speed monitoring of inland waters.

A method and apparatus for reducing GNSS signal interference using an adaptive notch filter (ANF) operates based on signals received from one or more satellites of a Global Navigation Satellite System (GNSS), such as GPS, GLONASS, etc. In one embodiment, the apparatus includes a notch filter having a tunable frequency of transfer function zero, the notch filter receiving an input signal and generating an output signal. A bandpass filter coupled to an output of the notch filter receives the output signal. An adaptive block is coupled to the bandpass filter and adjusts notch filter parameters to achieve a minimization of a particular cost function.

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 invention discloses a Beidou wide area atmospheric water vapor inversion and meteorological parameter real-time monitoring method, which belongs to the technical field of meteorological monitoring, and is mainly composed of a hardware platform and a software platform, wherein the hardware platform mainly comprises acquisition of temperature, humidity and pressure meteorological data, Beidou navigation satellite signal receiving and real-time acquisition of original observation data of BDS, GPS, GLONASS and Galileo systems, and the software platform mainly comprises precision positioning software, distributed water vapor inversion software, centralized water vapor inversion software and remote monitoring software. By the adoption of the method, real-time, high-precision, high-temporal-spatial-resolution and remotely-monitored atmospheric water vapor and meteorological parameter detection can be provided, the real-time temperature is obtained through the temperature, humidity and pressure element acquisition module, the weighted average temperature is obtained according to the local weighted calculation model, the water vapor conversion factor is calculated, and the real-time temperature and the weighted average temperature are calculated. And calculating the precipitation amount of the atmosphere through the water-vapor conversion factor and the zenith wet retardation amount.

The invention relates to a GNSS baseband with a configurable scale. The GNSS baseband comprises an IF interface module, a preprocessing module, a tracking engine FIFO module, a tracking engine group and an arbitration module. According to the invention, a specific flexible baseband architecture is used for processing navigation signals of a GPS, a BDS, a GLONASS, a Galileo and the like. In satellite signal tracking, a time division multiplexing mode is adopted for a tracking channel, state / control data of a corresponding channel is loaded during multiplexing switching of the corresponding channel, and register state data of the corresponding channel is written back into an SRAM after channel operation is completed. And through a channel time division multiplexing mode, the chip area is effectively saved, and the utilization rate of hardware is improved. According to the invention, multi-system, multi-frequency-point and multi-channel tracking is realized, the scale of the GNSS baseband can be randomly configured between a single-system single frequency point and a multi-system multi-frequency point, the configuration mode is simple, and composition modules of the GNSS baseband system can be flexibly selected.

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.

Described are multi-band panel antennas which are configurable to have heavy-duty construction and which are fully IP67 waterproof. Suitable applications for the disclosed antennas include internet of things (IoT) gateway and IoT routers, HD video streaming, transportation, and remote monitoring applications. Additionally, the antennas can deliver MIMO coverage technology for worldwide 4G LTE bands at 698 to 960 MHz / 1710 to 2170 MHz / 2490 to 2690 MHz / 3300 to 3600 MHz, Satellite Band, dual-band 2.4 / 5.8 GHz WiFi, and GNSS (GPS-GLONASS-BeiDou).