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Ground GPS signal transmitter

A transmitter and ground technology, applied in instruments, satellite radio beacon positioning systems, beacon systems using radio waves, etc., can solve problems such as clock synchronization, and achieve the effects of easy installation, low cost, and portability

Inactive Publication Date: 2006-08-30
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this also causes a clock synchronization problem between the pseudolite and GPS

Method used

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  • Ground GPS signal transmitter
  • Ground GPS signal transmitter
  • Ground GPS signal transmitter

Examples

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Embodiment

[0020] Example: such as figure 1 As shown, the ground GPS transmitter includes a reference clock, a programmable logic device, a navigation message (D code) circuit, a phase-locked loop circuit, a mixer, an amplifier, and a transmitting antenna. The phase-locked loop circuit is composed of a loop filter, a phase detector and a voltage-controlled oscillator. The reference clock adopts a temperature-compensated crystal oscillator, and the reference clock sends the base frequency signal to the phase-locked loop circuit and the programmable logic device respectively; the phase-locked loop circuit transmits the L1 carrier generated according to the base frequency signal after denoising by the band-pass filter To the mixer; the programmable logic device (CPLD) generates continuous C / A codes at the reference frequency, and the navigation message (D code) sent by the navigation message (D code) circuit every 20ms to form a composite code by modulo 2, sent to the mixer. The mixer mod...

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Abstract

The invention discloses a ground GPS emitter that includes reference clock, PLC, navigation message circuit, phase locked loop, mixer, amplifier, and transmitting antenna. The reference clock adopts temperature compensation oscillator, and sends base frequency signal to phase locked loop and PLC. The phase locked loop would generate L1 carrier wave sending to mixer. The PLC generates continuously C / A code and navigation message to form combining code and transmitting to mixer. The mixer modulates the combining code on L1 carrier wave in BPSK method to form GPS signal and after being filtered by band-pass filter and amplifying, it would be sent into airspace. The invention is low cost, simple structure and is easy to install. It could be used in engineering monitoring.'

Description

technical field [0001] The invention relates to a ground GPS signal transmitter. Background technique [0002] Global Positioning System (GPS) is one of the most advanced measurement methods today. Its precise positioning theory and technology have been widely used in many fields such as geodesy, crustal movement monitoring, precision engineering measurement and navigation. In actual engineering applications, the accuracy, availability and reliability of GPS positioning mainly depend on two important factors, the number of visible stars tracked and the geometry of their distribution. However, in urban high-rise dense areas and reservoirs, power stations, mines and other environments located in deep mountains and canyons, due to the influence of terrain and surrounding environment, the number of received GPS satellites usually cannot meet the minimum requirements for positioning, and the distribution is uneven, resulting in The accuracy of GPS positioning is greatly reduced,...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S1/02G01S19/27
Inventor 何秀凤桑文刚
Owner HOHAI UNIV