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 global navigation satellite system (GNSS) signal output system is proposed. The system may include a signal generating apparatus configured to receive GNSS navigation information and generate, based on the GNSS navigation information, a pseudo GNSS signal corresponding to a current time and a current location. The system may also include a plurality of leakage cables including a plurality of signal leakage slots. The system may further include a plurality of signal output apparatuses configured to receive the pseudo GNSS signal from the signal generating apparatus and output the pseudo GNSS signal to at least one of the plurality of leakage cables. The plurality of signal output apparatuses may be arranged apart from each other.

In some aspects, a mobile device is configured to obtain a set of satellite signal measurements through measuring, for each satellite in a first plurality of satellites, a first signal from the satellite in a first frequency band and a second signal from the satellite in a second frequency band. The first plurality of satellites can include at least a first satellite, a second satellite, and a third satellite. The mobile device can determine that at least one measurement in the set of satellite signal measurements is impaired, based on a difference between a measurement of the first signal from a particular satellite (e.g., the first satellite, the second satellite, or the third satellite) and a measurement of the second signal from the particular satellite. A position of the mobile device can then be determined based on non-impaired measurements in the set of satellite signal measurements.

In some aspects, a mobile device is configured to obtain a set of satellite signal measurements through measuring, for each satellite in a first plurality of satellites, a first signal from the satellite in a first frequency band and a second signal from the satellite in a second frequency band. The first plurality of satellites can include at least a first satellite, a second satellite, and a third satellite. The mobile device can determine that at least one measurement in the set of satellite signal measurements is impaired, based on a difference between a measurement of the first signal from a particular satellite (e.g., the first satellite, the second satellite, or the third satellite) and a measurement of the second signal from the particular satellite. A position of the mobile device can then be determined based on non-impaired measurements in the set of satellite signal measurements.

The presence or absence of a preamble is detected with accuracy in a reception apparatus that receives a signal including a preamble. A reception section receives a subframe including a subframe preamble and a message and a frame including a frame preamble. A processing section performs a process of detecting the presence or absence of the subframe preamble according to whether or not a given relation holds between a reception timing of the subframe preamble and a reception timing of the frame preamble. A message decoding section extracts the message from the subframe and decodes the message in a case where the presence of the subframe preamble is detected.

A method and apparatus are provided for demodulating an L1S signal from a satellite in the Quasi-Zenith Satellite System (QZSS). The method comprises tracking another L1 signal transmitted by the satellite, and predicting, based on the tracking parameters of the other L1 signal, one or more parameters of the L1S signal. The L1S signal is demodulated based on the one or more predicted parameters.

Systems, methods, and apparatus for power adjustment for code signals are disclosed. In one or more embodiments, a disclosed method for adjusting power for code signals comprises determining, by at least one processor, a code loss for the transmission of the code signals by using a symbol table. The method further comprises determining, by at least one processor, an amount of change in attenuation for at least one adjustable attenuator on at least one vehicle by using the code loss. Further, the method comprises adjusting an attenuation, for at least one adjustable attenuator, by the amount of change in attenuation.

Systems, methods, and apparatus for power adjustment for code signals are disclosed. In one or more embodiments, a disclosed method for adjusting power for code signals comprises determining, by at least one processor, a code loss for the transmission of the code signals by using a symbol table. The method further comprises determining, by at least one processor, an amount of change in attenuation for at least one adjustable attenuator on at least one vehicle by using the code loss. Further, the method comprises adjusting an attenuation, for at least one adjustable attenuator, by the amount of change in attenuation.

A Provided is a communication device that includes a plurality of antenna units that are arranged in an array. Each of the antenna units includes a first antenna element and a second antenna element that are arranged in a first direction, a first receiving unit that receives a first wireless signal used in satellite positioning, via the first antenna element, and a second receiving unit receives a second wireless signal used in the satellite positioning, via the second antenna element. Among the antenna units, a first and a second antenna units that are positioned adjacently to each other in a second direction being perpendicular to the first direction are arranged in such a manner that the first antenna element in one of the first and the second antenna is positioned adjacently to the second antenna element in the other antenna in the second direction.