Disclosed are systems and methods for detecting traffic violations using one or more mobile detection devices. Videos captured by one or more mobile detection devices can be processed on the mobile detection devices to extract data and information concerning a potential traffic violation involving a vehicle and a restricted road area. The mobile detection devices can transmit such data and information to a server configured to make a determination as to whether a traffic violation has occurred by comparing the data and information received from the mobile detection devices.

Disclosed are systems and methods for detecting traffic violations using one or more mobile detection devices. Videos captured by one or more mobile detection devices can be processed on the mobile detection devices to extract data and information concerning a potential traffic violation involving a vehicle and a restricted road area. The mobile detection devices can transmit such data and information to a server configured to make a determination as to whether a traffic violation has occurred by comparing the data and information received from the mobile detection devices.

A satellite signal receiving device includes a first RF receiving circuit receiving a first satellite signal from a first GNSS, a second RF receiving circuit receiving a second satellite signal from a second GNSS, a baseband processing circuit processing the first satellite signal and the second satellite signal, and one or more processors configured to control operations of the first RF receiving circuit, the second RF receiving circuit, and the baseband processing circuit, in which the one or more processors are configured to execute performing reception processing of the first satellite signal, acquiring a first reception state including a processing result of the reception processing of the first satellite signal, determining processing capacity of reception processing of the second satellite signal depending on the first reception state, and performing the reception processing of the second satellite signal with the processing capacity.

A positioning method may include: receiving a positioning signal of at least one constellation; determining a quality parameter of each constellation of the at least one constellation correspondingly based on the positioning signal of the at least one constellation; controlling a terminal equipment to stop receiving the positioning signal of the constellation of the at least one constellation, where the quality parameter of the constellation meets a preset condition.

Methods and apparatus for detecting a potential fault in a positioning device, the apparatus including at least one memory for storing instructions, and at least one controller configured to execute the instructions to perform operations including obtaining information about a received signal received by the positioning device, the information including at least one of a control parameter or an estimation of bias based on the received signal; determining whether the potential fault is detected, based on the information and a detection threshold; and in response to a determination that the potential fault is detected, generating an indication that the potential fault is detected.

A multisystem radio-frequency unit of navigational satellite receivers usable for simultaneous reception of any combination of navigation satellite signals from multiple navigation systems. The unit includes four identical independently configurable reception channels, an automatic intermediate frequency filter band calibration system and two heterodyne frequency synthesizers, forming heterodyne signals for quadrature mixers of reception channels and clock signals for a correlator. Each reception channel includes a two-stage automatic gain control system. During operation, a heterodyne frequency synthesizer is capable of generating any heterodyne frequency using any reference frequency, wherein heterodyne frequency, located either symmetrically or asymmetrically between spectra of received global navigation satellite signals.

A multisystem radio-frequency unit of navigational satellite receivers usable for simultaneous reception of any combination of navigation satellite signals from multiple navigation systems. The unit includes four identical independently configurable reception channels, an automatic intermediate frequency filter band calibration system and two heterodyne frequency synthesizers, forming heterodyne signals for quadrature mixers of reception channels and clock signals for a correlator. Each reception channel includes a two-stage automatic gain control system. During operation, a heterodyne frequency synthesizer is capable of generating any heterodyne frequency using any reference frequency, wherein heterodyne frequency, located either symmetrically or asymmetrically between spectra of received global navigation satellite signals.

A mobile device may be configured to perform concurrent Satellite Positioning System (SPS) operation and wireless communications when uplink signals transmitted by the mobile device interferes with the reception of SPS signals in one or more frequency bands. The mobile device may determine if the SPS receiver has already acquired SPS signals and is in a tracking state. If the SPS receiver is not in a tracking state, an SPS acquisition procedure is initiated before the wireless communication session is initiated. The SPS acquisition procedure is performed until the SPS receiver reaches a tracking state, or until a timeout is reached. Once the SPS receiver is in a tracking state, the wireless communication session may be initiated, during which the SPS receiver is controlled, e.g., to perform signal blanking, measurement exclusion, or disable SPS reception, to mitigate interference with SPS signals.

A mobile device may be configured to perform concurrent Satellite Positioning System (SPS) operation and wireless communications when uplink signals transmitted by the mobile device interferes with the reception of SPS signals in one or more frequency bands. The mobile device may determine if the SPS receiver has already acquired SPS signals and is in a tracking state. If the SPS receiver is not in a tracking state, an SPS acquisition procedure is initiated before the wireless communication session is initiated. The SPS acquisition procedure is performed until the SPS receiver reaches a tracking state, or until a timeout is reached. Once the SPS receiver is in a tracking state, the wireless communication session may be initiated, during which the SPS receiver is controlled, e.g., to perform signal blanking, measurement exclusion, or disable SPS reception, to mitigate interference with SPS signals.

A satellite signal receiving circuit includes an oscillator, two mixers, two phase shifters, two low-pass filters, two phase operation circuits, and a bandpass filter. When the frequency of the oscillator is between the center frequencies of the Global Orbiting Navigation Satellite System (GLONASS) and the GPS or the Galileo system, the GLONASS and GPS/Galileo satellite baseband signals are obtained through phase addition and subtraction performed by the phase operation circuits, while the BeiDou Navigation Satellite System (BDS) baseband signal is obtained through the bandpass filter. When the frequency of the oscillator is between the center frequencies of the BDS and the GPS or the Galileo system, the BDS and GPS/Galileo satellite baseband signals are obtained through phase addition and subtraction performed by the phase operation circuits, while the GLONASS satellite baseband signal is obtained through the bandpass filter.