Abstract: The disclosed method for determining atmospheric time delays involves receiving at least two signals, where the signals each have a different carrier frequency. The method further involves amplifying each of the signals with a respective amplifier for each of the signals to produce amplified signals. Also, the method involves digitizing each of the amplified signals with a respective analog to digital converter (ADC) for each of the amplified signals to produce digital signals. In addition, the method involves correlating each of the digital signals with a code using a respective correlator for each of the digital signals to determine the time group delay differential between the signals. Further, the method involves calculating, with at least one processor, the time group delay coefficient of the signals by using the time group delay differential. The time group delay coefficient is used to correct for the atmospheric time delays in the signals.

Abstract: A system and method include a modulator configured to combine satellite codes with carrier signals on an in-phase channel and a quadrature-phase channel to produce I-channel and Q-channel signal components. The powers of the combined satellite codes are selected according to desired code power fractions. A processor pre-distorts the signal components such that they can be transmitted as a unit-amplitude constant envelope transmission that preserves the desired code power fractions. The pre-distortion may also account for data filtering effects that tend to distort the code power fractions.

Abstract: Systems, methods, and apparatus for a satellite link budget command interface tool are disclosed. In one or more embodiments, a method for commanding a space vehicle (SV) involves determining a transmitter output power for a control word (CW) at a particular temperature for a transmitter on the SV. Also, the method involves generating a transmitter uplink command by using the transmitter output power. Also, the method involves determining channel power for a mode of operation for at least one code. In addition, the method involves determining attenuated channel power for the mode of operation for the at least one code, where the channel power for the at least one code is attenuated. Additionally, the method involves generating at least one attenuated channel power uplink command by using the attenuated channel power for at least one code.

Abstract: A system and method include a modulator configured to combine satellite codes with carrier signals on an in-phase channel and a quadrature-phase channel to produce I-channel and Q-channel signal components. The powers of the combined satellite codes are selected according to desired code power fractions. A processor pre-distorts the signal components such that they can be transmitted as a unit-amplitude constant envelope transmission that preserves the desired code power fractions. The pre-distortion may also account for data filtering effects that tend to distort the code power fractions.

Abstract: Systems, methods, and apparatus for a satellite link budget command interface tool are disclosed. In one or more embodiments, a method for commanding a space vehicle (SV) involves determining a transmitter output power for a control word (CW) at a particular temperature for a transmitter on the SV. Also, the method involves generating a transmitter uplink command by using the transmitter output power. Also, the method involves determining channel power for a mode of operation for at least one code. In addition, the method involves determining attenuated channel power for the mode of operation for the at least one code, where the channel power for the at least one code is attenuated. Additionally, the method involves generating at least one attenuated channel power uplink command by using the attenuated channel power for at least one code.

Abstract: A system and method include a modulator to combine satellite codes with a carrier signal on an I-Channel and a Q-Channel. A processor applies a code power fraction to the combined codes on the I-Channel and the Q-Channel to provide a unity amplitude while maintaining a phase angle so that a signal constant envelope transmission can occur without a balancing code.

Abstract: A system and method include a modulator to combine satellite codes with a carrier signal on an I-Channel and a Q-Channel. A processor applies a code power fraction to the combined codes on the I-Channel and the Q-Channel to provide a unity amplitude while maintaining a phase angle so that a signal constant envelope transmission can occur without a balancing code.

Abstract: A method for processing a signal having a plurality of codes. The method includes receiving the signal at a receiver and removing a carrier signal from the signal. The method further includes isolating a data stream from the carrier signal and determining timing of the plurality of codes. The plurality of codes is filtered to separate from the plurality of codes in the data stream a particular code for each plurality of codes that correlates to the received signal.

Abstract: The disclosed method for determining atmospheric time delays involves receiving at least two signals, where the signals each have a different carrier frequency. The method further involves amplifying each of the signals with a respective amplifier for each of the signals to produce amplified signals. Also, the method involves digitizing each of the amplified signals with a respective analog to digital converter (ADC) for each of the amplified signals to produce digital signals. In addition, the method involves correlating each of the digital signals with a code using a respective correlator for each of the digital signals to determine the time group delay differential between the signals. Further, the method involves calculating, with at least one processor, the time group delay coefficient of the signals by using the time group delay differential. The time group delay coefficient is used to correct for the atmospheric time delays in the signals.

Abstract: A method and apparatus comprising a satellite, an antenna system associated with the satellite, and a transmitter in the satellite. The antenna system is configured to transmit a signal in a direction away from a surface of an earth. The transmitter is configured to transmit location information in the signal using the antenna system.

Abstract: A method for processing a signal having a plurality of codes. The method includes receiving the signal at a receiver and removing a carrier signal from the signal. The method further includes isolating a data stream from the carrier signal and determining timing of the plurality of codes. The plurality of codes is filtered to separate from the plurality of codes in the data stream a particular code for each plurality of codes that correlates to the received signal.

Abstract: A method and apparatus comprising a satellite, an antenna system associated with the satellite, and a transmitter in the satellite. The antenna system is configured to transmit a signal in a direction away from a surface of an earth. The transmitter is configured to transmit location information in the signal using the antenna system.