L1/L2 GPS receiver
First Claim
1. A method for generating local oscillator frequency signals for dual frequency signals, wherein the method comprises:
- generating a sub-harmonic frequency so as to enable harmonics of the sub-harmonic frequency to generate local oscillator frequency signals for the dual frequency carrier signals, and mixing the dual frequency carrier signals with the local oscillator frequency signals, to generate distinct intermediate frequency signals for each dual frequency carrier signal; and
separating the dual frequency carrier signals, and switching between the dual frequency carrier signals, responsive to exchanging in-phase and quadrature-phase components of the local oscillator frequency signals.
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Accused Products
Abstract
In a system and method for simultaneously receiving or switching between dual frequency carrier signals in a GPS receiver, the GPS receiver is adapted to utilize different harmonics of a sub-harmonic frequency generator, which may include a lower frequency voltage controlled oscillator (VCO) to detect the L1 and L2 GPS carriers. A sub-harmonic mixer may be used to simultaneously down convert the L1 and L2 signals to a lower intermediate frequency (IF). A second mixer may be an image reject (IR) mixer used to separate the downconverted L1 and L2 signals. This mixer may be configured to simultaneously monitor the L1 and L2 signals, or to switch between the L1 and L2 signals. High frequency switching is not required of the radio frequency (RF) input or local oscillator signals, and simultaneous L1 and L2 reception is enabled without a 3 dB image noise degradation. This system and method minimizes the RF components and power dissipation in a dual frequency GPS receiver, while optimizing the functionality and performance.
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Citations
13 Claims
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1. A method for generating local oscillator frequency signals for dual frequency signals, wherein the method comprises:
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generating a sub-harmonic frequency so as to enable harmonics of the sub-harmonic frequency to generate local oscillator frequency signals for the dual frequency carrier signals, and mixing the dual frequency carrier signals with the local oscillator frequency signals, to generate distinct intermediate frequency signals for each dual frequency carrier signal; and separating the dual frequency carrier signals, and switching between the dual frequency carrier signals, responsive to exchanging in-phase and quadrature-phase components of the local oscillator frequency signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification