Hybrid translator in a global positioning system (GPS)
First Claim
1. A hybrid GPS translator adapted to relay a semi-processed, reduced-bandwidth GPS signal, the hybrid GPS translator comprising:
- a frequency-locked loop (FLL) configured to provide a frequency measurement associated with baseband I and Q signals, wherein the baseband I and Q signals are downconverted from a GPS carrier signal, the FLL being configured to provide a first signal indicating a frequency error between the baseband I and Q signals and a second signal whose frequency corresponds to the frequency measurement; and
an interface circuit coupled to the FLL to receive the frequency error and the frequency measurement, wherein the interface circuit is adapted to couple to a downlink circuit that can transmit the frequency error and the frequency measurement to a remote location.
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Abstract
A system for tracking high-dynamic targets by relaying semi-processed GPS signals to a remote signal processing station with a relatively small and efficient bandwidth is described. Such processed GPS signals can be provided in a high-dynamic environment without the assistance of an inertial measurement unit (IMU). One embodiment includes a hybrid translator that is a hybrid between a full GPS navigation system and a translator system. The modulated GPS signals, such as modulated C/A codes, are pre-processed to reduce the amount of information required to reconstruct the GPS signal received by the hybrid translator. For example, the GPS signals can be processed to a pseudo-range measurement and an indication of an amount of corruption of delta range in the pseudo-range measurement, which are then provided to signal processing at a remote location, such as at a ground station, via a wireless downlink.
32 Citations
14 Claims
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1. A hybrid GPS translator adapted to relay a semi-processed, reduced-bandwidth GPS signal, the hybrid GPS translator comprising:
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a frequency-locked loop (FLL) configured to provide a frequency measurement associated with baseband I and Q signals, wherein the baseband I and Q signals are downconverted from a GPS carrier signal, the FLL being configured to provide a first signal indicating a frequency error between the baseband I and Q signals and a second signal whose frequency corresponds to the frequency measurement; and an interface circuit coupled to the FLL to receive the frequency error and the frequency measurement, wherein the interface circuit is adapted to couple to a downlink circuit that can transmit the frequency error and the frequency measurement to a remote location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification