GPS rapid hot start method

A hot start and fast technology, applied in the field of GPS communication, can solve the problems of accelerating the first positioning speed of the receiver and the long time of GPS hot start process, so as to achieve accurate estimation and ensure stable work

Inactive Publication Date: 2009-09-09
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the defect that the existing GPS hot start process takes a long time, and provide a GPS fast hot start method, which is used in the hot start mode of the GPS receiver to speed up the first positioning speed of the receiver hot start, so as to Realize the rapid positioning of the receiver

Method used

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Embodiment Construction

[0014] see figure 1 , shows a GPS system model diagram, which includes: a ground GPS receiver 101, a pseudo-range 102 from the receiver to the satellite, a GPS satellite 103 at the time of transmission, and a satellite 104 at the time of reception. The main process is that the GPS signal is transmitted through the antenna, passes through the atmosphere, has scattering, refraction and other effects, and reaches the receiver antenna. Due to the existence of satellite clock bias, relativistic effect, inter-satellite group delay, ionospheric delay, tropospheric delay, etc., the distance measured by the spread spectrum code of the receiver is delayed. The distance measured by the receiver includes not only the line-of-sight distance between the satellite and the receiver, but also the distance caused by various delays, which is called "pseudo-range".

[0015] Among them, after the receiver enters the tracking state, the spread spectrum code tracking loop can accurately track the G...

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Abstract

The invention relates to a GPS rapid hot start method. After being started up by hot start, a receiver utilizes the assist of a local real time clock unit RTC (Real Time Clock) to carry out two-dimension trap of spreading code, i.e. carrier frequency when in a trap state, basically aligns local C / A codes with the received code flow with the deviation within a 0.5 code chip; the deviation between the carrier frequency and the received carrier frequency is not more than 100Hz; once signals are trapped, the bit synchronization is then carried out to find the telegraph bit boundary of 20 ms; once finding telegraph bit boundary is completed, the tracking state is entered in, so that a local spreading code generator and a local carrier generator track the received GPS signals and carrier signals in real time to complete first rapid positioning and directly enter into a positioning resolving link without waiting for the completion of a baseband subframe synchronous process to calculate the on-orbit position and the pseudo-range of a satellite, and resolve the receiver position through a least square method to complete the rapid positioning. The method further ensures the effectiveness through a hot start failure detection mechanism.

Description

technical field [0001] The invention relates to a hot start of a GPS receiver, in particular to a GPS fast hot start method, which belongs to the technical field of GPS communication. Background technique [0002] The GPS system is a Direct Sequence Spread Spectrum (DSSS, Direct Sequence Spread Spectrum) communication system. Its main feature is that it uses Pseudo Random Noise Code (Pseudo Random Noise Code) to carry out spread spectrum modulation on the carrier. Therefore, the GPS receiver needs to complete the operations of despreading and demodulation, and obtain satellite ephemeris and pseudorange solutions to calculate the receiver coordinates. [0003] The hot start-up process of the GPS receiver is based on the general position of the receiver, the satellite ephemeris and the satellite almanac are all valid, multiple channels perform baseband signal processing in parallel, and calculate multiple satellite coordinates and pseudoranges, thereby realizing the first tim...

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Application Information

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IPC IPC(8): G01S1/02
Inventor 杨军秦奋刘新宁时龙兴
Owner SOUTHEAST UNIV
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