Global position system (GPS) multiplexed receiver
First Claim
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1. A multiplexed receiver for a Global Position System or the like comprising a digitally implemented RF receiver including:
- (a) a single RF receiver channel for receiving the L1 and L2 p code or ca code modulated frequency outputs of a plurality of RF transmitter space vehicles;
(b) switching means connected to the receiver channel for coherently switching and tracking the L1 and L2 frequencies of each space vehicle; and
(c) code tracking loops and carrier tracking loops operatively connected to the receiver channel, said receiver channel operative in response to the loops to generate I and Q baseband signals from each of the L1 and L2 frequencies, said code tracking loops and said carrier tracking loops each including a common predetection circuit connected to the receiver channel for analog-to-digital conversion of the I and Q signals, tracking filter means operative responsively to the I and Q signals for tracking vehicle dynamics as manifested in both code and carrier and for tracking L1 and L2 differentials as manifested in both code and carrier, and code and carrier digital oscillators, respectively, connected to the tracking filter means, said code tracking loop further including a code generating means, and said filter means including code tracking sum and difference filters and carrier tracking sum and difference filters said code and carrier digital oscillators, respectively, updated responsively to the said code tracking sum and difference filters and to said carrier tracking and sum difference filters and multiplexed between the L1 and L2 frequencies whereby the vehicle dynamics and ionosphere effect on the L1 and L2 frequencies is determined.
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Abstract
A global positioning system comprises an RF receiver for receiving L1, L2 p-code or ca code modulated frequency outputs from one or more space vehicles, a multiplexer operably connected to the receiver multiplexes the L1 and L2 signals to the receiver, and code and carrier tracking loops operably connected to the receiver, each loop including a plurality of filters, one for tracking line-of-sight dynamics and another for determining ionosphere effects on the L1 and/or L2 signals.
72 Citations
15 Claims
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1. A multiplexed receiver for a Global Position System or the like comprising a digitally implemented RF receiver including:
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(a) a single RF receiver channel for receiving the L1 and L2 p code or ca code modulated frequency outputs of a plurality of RF transmitter space vehicles; (b) switching means connected to the receiver channel for coherently switching and tracking the L1 and L2 frequencies of each space vehicle; and (c) code tracking loops and carrier tracking loops operatively connected to the receiver channel, said receiver channel operative in response to the loops to generate I and Q baseband signals from each of the L1 and L2 frequencies, said code tracking loops and said carrier tracking loops each including a common predetection circuit connected to the receiver channel for analog-to-digital conversion of the I and Q signals, tracking filter means operative responsively to the I and Q signals for tracking vehicle dynamics as manifested in both code and carrier and for tracking L1 and L2 differentials as manifested in both code and carrier, and code and carrier digital oscillators, respectively, connected to the tracking filter means, said code tracking loop further including a code generating means, and said filter means including code tracking sum and difference filters and carrier tracking sum and difference filters said code and carrier digital oscillators, respectively, updated responsively to the said code tracking sum and difference filters and to said carrier tracking and sum difference filters and multiplexed between the L1 and L2 frequencies whereby the vehicle dynamics and ionosphere effect on the L1 and L2 frequencies is determined. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A global positioning system comprising:
- an RF receiver consisting of a single channel having operatively connected therein a multiplexing means for alternately selecting incoming L1 and L2 signals transmitted from space vehicles and a tracking circuit means for tracking vehicle dynamics and ionospheric delay effect on RF signals transmitted from a space vehicle.
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15. A global positioning system comprising:
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(a) a single channel RF receiver for receiving L1, L2 p- code or ca code modulated frequency outputs from a space vehicle; (b) a multiplexer operably connected to the receiver for multiplexing L1 and L2 signals to the RF receiver; and (c) code and carrier tracking loops, each loop including a plurality of filters one for tracking line of sight dynamics and another for determining ionosphere effects on the L1 and L2 signals.
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Specification