SATELLITE NAVIGATIO RECEIVER HAVING CONFIGURABLE ACQUISITION AND TRACKING ENGINES
First Claim
1. A satellite navigation receiver comprising:
- an analog section for performing analog signal processing on a received satellite navigation signal;
an acquisition engine coupled to the analog section that acquires the satellite navigation signal;
a delay line coupled to the acquisition engine, wherein the delay line can function as a single entity and full CA code is searched and wherein the delay line can be divided into sections with each section used to search a partial CA code;
a processor coupled to the acquisition engine that processes data from the acquisition engine to provide location information.
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Accused Products
Abstract
A satellite navigation receiver having a flexible acquisition and tracking engine architecture. The flexible acquisition engine has a reconfigurable delay line that can be used either as a single entity or divided into different sections. Consequently, it can be configured to search different satellite vehicles, a single Doppler frequency, and full CA code in parallel. When configuring the delay line into different sections, each section is used to search a partial CA code. In this configuration, multiple Doppler mode, multiple satellite vehicles, multiple Doppler frequencies, and partial CA code can be searched in parallel. Furthermore, the different sections of the CA code can be time-multiplexed into a correlator, which can then be over clocked to achieve full CA code correlation. The flexible tracking engine includes a number of parallel tracking channels, whereby each individual channel has a number of taps or fingers, which can be used to lock onto different delays. During tracking, one of the taps can be used to lock on to the center of the peak. This leaves the other taps free to be used to perform other functions, such as determining the shape of the peak, detecting earlier arrivals for line of sight component, and obtaining an estimate of the noise floor. The flexible tracking engine is configurable to help acquisition functions, such as fine acquisition, false trigger detection, and/or fast reacquisition.
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Citations
32 Claims
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1. A satellite navigation receiver comprising:
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an analog section for performing analog signal processing on a received satellite navigation signal; an acquisition engine coupled to the analog section that acquires the satellite navigation signal; a delay line coupled to the acquisition engine, wherein the delay line can function as a single entity and full CA code is searched and wherein the delay line can be divided into sections with each section used to search a partial CA code; a processor coupled to the acquisition engine that processes data from the acquisition engine to provide location information. - View Dependent Claims (2, 3, 4, 5)
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6. A satellite navigation receiver comprising:
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an analog section for performing analog signal processing on a received satellite navigation signal; a tracking engine coupled to the analog section that tracks the satellite navigation signal, wherein the tracking engine comprises a plurality of tracking channels, each tracking channel having a configurable plurality of taps that can be used to lock on to a plurality of different delays; and a processor coupled to the tracking engine that processes data to provide location information. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A GPS receiver comprising:
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an analog section for performing analog signal processing on a received satellite navigation signal; a tracking engine coupled to the analog section that tracks the satellite navigation signal, wherein the tracking engine comprises a plurality of tracking channels, each tracking channel operable to search for one Doppler frequency and a configurable plurality of code phases in parallel; and a processor coupled to the tracking engine that processes data to provide location information. - View Dependent Claims (20)
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21. A method of determining a location of a satellite navigation receiver comprising:
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receiving a navigation signal from a satellite; performing analog signal processing on the navigation signal; correlating the navigation signal to either a full CA code or a partial CA code, wherein a single delay line is used to correlate the navigation signal to the full CA code and a section of the delay line is used to correlate the navigation signal to the partial CA code; generating location information based on a correlated navigation signal. - View Dependent Claims (22, 23, 24)
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25. A method of determining a location of a GPS receiver comprising:
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acquiring a signal from a GPS satellite; searching for one Doppler frequency and a configurable plurality of CA code phases in parallel; and generating location information based on the searching step. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification