GNSS receiver and external storage device system and GNSS data processing method
First Claim
Patent Images
1. A system for processing GNSS signals from multiple satellite sources received, which comprises:
- a GNSS receiver including a digital signal processor (DSP) and a general purpose central processing unit (CPU);
USB host hardware connected to said CPU;
a USB serial interface connected to said CPU;
said CPU having random access memory (RAM);
nonvolatile memory connected to said receiver;
said receiver including a real-time operating system (RTOS) including a hardware abstraction layer (HAL) and upper-level USB software enabling USB host capability;
said USB host hardware and the USB software interfacing with the HAL;
USB host software embedded in said CPU and including interrupt service routines (ISRs) and delayed service routines (DSRs) in said USB host software;
said ISRs handling USB activities between the upper-level USB software and the HAL;
said DSRs handling USB activities not handled by the ISRs;
said RTOS providing time slice bases for executing the DSRs;
said GNSS receiver software including a PC compatible file system and receiving raw analog GNSS ranging and timing signals;
an AD converter downconverting the raw analog GNSS signals to digital signals;
the digital signal processor (DSP) correlating the digital signals;
the CPU closing code and carrier tracking loops on a fixed time interval (interrupt) basis;
a user interface calculating a GNSS solution and communicating the GNSS solution;
the USB receiving output signals representing the GNSS positioning solution;
the external USB storage device providing compatibility for the RTOS files read from or written to the external USB storage device;
the CPU processing said output signals in real-time;
a mass storage interface transferring said output signals between said USB host hardware and said storage device;
said external USB storage device storing said output signals; and
said external computer post-processing said externally stored data.
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Abstract
A GNSS system includes a receiver connected to an external mass storage device. Applications for the system, including GNSS data processing methods are also disclosed. The external storage device can comprise a flash (thumb) drive, which can be connected to the receiver via a USB interconnection.
392 Citations
1 Claim
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1. A system for processing GNSS signals from multiple satellite sources received, which comprises:
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a GNSS receiver including a digital signal processor (DSP) and a general purpose central processing unit (CPU); USB host hardware connected to said CPU; a USB serial interface connected to said CPU; said CPU having random access memory (RAM); nonvolatile memory connected to said receiver; said receiver including a real-time operating system (RTOS) including a hardware abstraction layer (HAL) and upper-level USB software enabling USB host capability;
said USB host hardware and the USB software interfacing with the HAL;USB host software embedded in said CPU and including interrupt service routines (ISRs) and delayed service routines (DSRs) in said USB host software; said ISRs handling USB activities between the upper-level USB software and the HAL; said DSRs handling USB activities not handled by the ISRs; said RTOS providing time slice bases for executing the DSRs; said GNSS receiver software including a PC compatible file system and receiving raw analog GNSS ranging and timing signals; an AD converter downconverting the raw analog GNSS signals to digital signals; the digital signal processor (DSP) correlating the digital signals; the CPU closing code and carrier tracking loops on a fixed time interval (interrupt) basis; a user interface calculating a GNSS solution and communicating the GNSS solution; the USB receiving output signals representing the GNSS positioning solution; the external USB storage device providing compatibility for the RTOS files read from or written to the external USB storage device; the CPU processing said output signals in real-time; a mass storage interface transferring said output signals between said USB host hardware and said storage device; said external USB storage device storing said output signals; and said external computer post-processing said externally stored data.
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Specification
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Current AssigneeHemisphere GNSS(USA) Incorporated
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Original AssigneeHemisphere GNSS(USA) Incorporated
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InventorsWhitehead, Michael L., Badke, Bradley P., McClure, John A., Miller, Steven R.
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Primary Examiner(s)Phan, Dao
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Application NumberUS12/898,485Publication NumberTime in Patent Office973 DaysField of Search342/357.21, 342/357.26, 342/357.46, 342/357.69, 342/357.4, 701/468US Class Current342/357.4CPC Class CodesG01S 19/35 Constructional details or h...
