First information is obtained from a sensing device at a first time. The first information corresponds to a radio signal received at the device from a candidate location. The device is at a first location at the first time. Second information is obtained from the device at a second time. The second information corresponds to a radio signal received at the device from the candidate location. The device is at a second location at the second time. A system determines that a pattern is in each of the first and second information and determines relationships between the candidate location and the device at each first and second location. The system obtains inverses of the relationships and determines estimates of the received radio signals based on the information and inverses. The system measures or estimates energy emitted from the candidate location based on the estimates.

A navigational apparatus and method for augmenting a GNSS signal to the GPS simulator with alternative position, navigation, or timing (PNT) data, wherein the GPS simulator encodes an RF-simulated GPS signal based on the alternative PNT data when the GNSS signal is not available or is denied. The alternative PNT data may be provided by one or more of an Inertial Measurement Unit, Inertial Navigation System (IMU/INS) module and oscillator coupled to the GPS simulator.

A navigational apparatus and method for augmenting a GNSS signal to the GPS simulator with alternative position, navigation, or timing (PNT) data, wherein the GPS simulator encodes an RF-simulated GPS signal based on the alternative PNT data when the GNSS signal is not available or is denied. The alternative PNT data may be provided by one or more of an Inertial Measurement Unit, Inertial Navigation System (IMU/INS) module and oscillator coupled to the GPS simulator.

It is provided a joint receiver and receiving method for navigation signals located at adjacent frequencies. The joint receiving method includes: receiving a first navigation signal and a second navigation signal which are located at adjacent frequencies (S1); and calculating a frequency estimation of a virtual wideband navigation signal constructed based on the first navigation signal and the second navigation signal (S2), wherein the virtual wideband navigation signal is an asymmetric BOC-like navigation signal having a virtual carrier and a virtual sub-carrier. With the joint receiver and joint receiving method, not only power gain but also bandwidth gain can be obtained, and the ranging precision can be significantly improved.

It is provided a joint receiver and receiving method for navigation signals located at adjacent frequencies. The joint receiving method includes: receiving a first navigation signal and a second navigation signal which are located at adjacent frequencies (S1); and calculating a frequency estimation of a virtual wideband navigation signal constructed based on the first navigation signal and the second navigation signal (S2), wherein the virtual wideband navigation signal is an asymmetric BOC-like navigation signal having a virtual carrier and a virtual sub-carrier. With the joint receiver and joint receiving method, not only power gain but also bandwidth gain can be obtained, and the ranging precision can be significantly improved.

An antenna includes a substrate layer having a first surface and an opposite second surface, the second surface having a metallization layer; a conductive layer disposed on the first surface of the substrate layer; a slot formed in the conductive layer, the slot including a first part and a second part that are symmetric to each other about a diagonal of the conductive layer; and at least one feed point on the conductive layer and spaced from the slot by a predetermined distance.

A positioning method, an electronic device and a storage medium, which relate to a field of computer technology, and in particular to fields of positioning technology and satellite navigation technology. The method includes: acquiring satellite observation data for a target object, broadcast ephemeris data for the target object, and state space representation for the target object; performing an error correction on the broadcast ephemeris data using the state space representation; determining a target positioning model according to the satellite observation data and the corrected broadcast ephemeris data; and performing a resolving operation on the target positioning model to obtain position data of the target object.

A satellite signal processing method includes: receiving, at a user equipment, a first satellite signal of a first frequency band from at least one satellite of a constellation of satellites; receiving, at the user equipment, a second satellite signal of a second frequency band and from the at least one satellite of the constellation of satellites; and controlling an activation status of at least one of: a first satellite signal receive chain, of the user equipment, configured to measure the first satellite signal; or a second satellite signal receive chain, of the user equipment, configured to measure the second satellite signal.

A device may use Precise Point Positioning (PPP) correction information to generate Real Time Kinematic (RTK) correction information that can be sent to other devices for RTK-based positioning. In particular, according to some embodiments, the first device having access to PPP correction information may obtain the PPP correction information and generate RTK correction information by determining a virtual RTK base station location and generating, based on the PPP correction information, a virtual Multi-Constellation Multi-Frequency (MCMF) measurement corresponding to the determined virtual RTK base station location. This virtual MCMF measurement (and/or data derived therefrom) can then be sent to other devices as RTK correction information.

Systems and methods for sharing convergence data between GNSS receivers are disclosed. Convergence data received at a GNSS receiver via a communication connection may be utilized to determine a position of the GNSS receiver.