GPS (global positioning system) software receiver signal tracking method based on FPGA (field programmable gate array) and system of GPS software receiver signal tracking method

A software receiver, GPS signal technology, applied in satellite radio beacon positioning system, radio wave measurement system, measurement device and other directions, can solve the problem of real-time tracking algorithm and other problems, to achieve real-time, high precision, reduce development cost effect

Inactive Publication Date: 2012-08-01
SOUTHEAST UNIV
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Problems solved by technology

[0004] The present invention utilizes the characteristics that FPGA can process data in real time, solves the real-time problems often encountered by tracking algorithms on PC platf...

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  • GPS (global positioning system) software receiver signal tracking method based on FPGA (field programmable gate array) and system of GPS software receiver signal tracking method
  • GPS (global positioning system) software receiver signal tracking method based on FPGA (field programmable gate array) and system of GPS software receiver signal tracking method
  • GPS (global positioning system) software receiver signal tracking method based on FPGA (field programmable gate array) and system of GPS software receiver signal tracking method

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Embodiment Construction

[0027] Such as figure 1 As shown, the carrier tracking loop adopts the alternate working mode of the frequency locked loop and the Costas phase locked loop. Into the capture band of the carrier phase tracking loop, at this time switch the loop to the costas phase locked loop for carrier phase tracking to reduce the tracking error. When the receiver is under high dynamic conditions, the system can detect and automatically switch to the FLL frequency tracking loop, thus effectively avoiding the problem of loop loss. It is mainly composed of five basic parts: carrier phase detector, carrier frequency detector, carrier generator, carrier loop filter, and phase decision device. In this working mode, the input digital intermediate frequency signal is divided into two channels, which are multiplied by the I and Q channels of the carrier generator, and then enter the code correlator, and correlate with the three pseudo codes of E, P, and L respectively to obtain 6-way related result...

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Abstract

Disclosed is a GPS (global positioning system) software receiver tracking method based on an FPGA (field programmable gate array). Inputted digital intermediate-frequency signals are transmitted into a code correlator after multiplying two channels I and Q of a carrier generator to obtain six channels of relevant results; in a carrier tracking loop, IP and QP in six channels of relevant outputs are transmitted into a phase decision device, frequency discrimination computation is carried out by a carrier frequency discriminator when phase deviation meets the condition that delta theta is larger than theta H, phase discrimination computation is carried out by a carrier phase discriminator if the phase deviation meets the condition that delta theta is smaller than theta H, a result is transmitted into the carrier generator after being filtered by a carrier loop filter so that carrier frequency is adjusted; and in a code tracking loop, IE, IL, QE and QL are taken to be transmitted into a code loop discriminator to be in phase discrimination computation, and results are transmitted into a CA (coarse acquisition) code generator after being filtered by a code loop filter so that phase ofCA codes is adjusted. The two loops are cross-coupled, the carrier frequency and the phase of the codes are synchronously tracked, accordingly, locally reproduced carriers and codes are aligned with signals, and navigation data bits are obtained after integral judgment for the IP is carried out by a posterior integral accumulation decision device.

Description

technical field [0001] The invention relates to a tracking technology of a GPS receiver, in particular to an FPGA-based GPS software receiver signal tracking method and system thereof, and belongs to the technical field of GPS software receiver baseband processing. Background technique [0002] At present, the world's major satellite navigation systems are developing vigorously, but the most mature and the largest market share is the GPS system. The GPS system is mainly composed of the space constellation part, the ground monitoring department and the user equipment department. Among them, the user sector has huge market prospects and commercial interests. Modern standard GPS software receivers use ASIC chips for baseband signal processing. If you want to upgrade or transform their performance, you need to redesign the ASIC chip, which is very expensive. With the progress of FPGA technology and manufacturing process in recent years, modern large-capacity and high-speed FPG...

Claims

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Application Information

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IPC IPC(8): G01S19/29
Inventor 潘树国王庆胡刚
Owner SOUTHEAST UNIV
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