truck tracking webfleet solutions

Home > NEWS > Other information > truck tracking webfleet solutions

Company News

Industry News

Analysis of GPS Antenna Principle

source:truck tracking webfleet solutions release time:2022-08-18 Hits:     Popular:realtime gps tracker online

  

  At present, the GPS receiver circuit in practical application is generally composed of four parts: antenna unit, radio frequency unit, communication unit and calculation unit. Based on the analysis of the composition of GPS satellite signals, this paper gives the principle and application of the radio frequency front-end GP2010.

  1. Composition of GPS satellite signals

  The GPS satellite signal is synthesized by typical code division multiple access (CDMA) modulation technology, and its complete signal mainly includes three components: carrier, pseudo-random code and data code. The signal carrier is in the L-band, and the center frequencies of the two carriers are denoted as L1 and L2, respectively. The satellite signal reference clock frequency f0 is 10.23MHz, and the center frequency of the signal carrier L1 is 154 times the frequency of f0, namely:

  fL1=154×f0=1575.42MHz (1)

  Its wavelength λ1=19.03cm; the center frequency of the signal carrier L2 is 120 times the frequency of f0, namely:

  fL2=120×f0=1227.60MHz (2)

  2. Analysis of GPS Antenna Principle

  Its wavelength λ2=24.42cm. The frequency difference between the two carriers is 347.82MHz, which is about 28.3% of L2. The carrier frequency is selected in this way to measure or eliminate the propagation delay error caused by the ionospheric effect when the navigation signal propagates from the GPS satellite to the receiver. Pseudo-random noise code (PRN), that is, ranging code, mainly includes two kinds of fine ranging code (P code) and coarse ranging code (C/A code). The code rate of the P code is 10.23MHz, and the code rate of the C/A code is 1.023MHz. The data code is the navigation and positioning data sent by the GPS satellite to the user receiver in binary form. It is also called the navigation message or D code. It mainly includes satellite calendar, satellite clock correction, ionospheric delay correction, working status information, and C/A code conversion. To capture the information of the P code and the general ephemeris of all satellites; the total message consists of 1500 bits, divided into 5 subframes, each subframe transmits 10 words within 6s, each word 30 bits, a total of 300 bits, so the data The baud rate of the code is 50bps.


Read recommendations:

GPS Tracking Solution

4G GPS Tracker for vehicles distributors

G200(L) -Magnet GPS Tracker

Introduce how Shao uses Beidou to determine the three -dimensional space location.plug & play Ob

GPS monitoring system develops rapidly

Last article:Handheld GPS Device

Next article:GPS helps you avoid electronic eyes

Related Information

vehicle gps tracker webfleet solutions

2023-03-16

fleetmanagement webfleet solutions

2023-03-16

Pet GPS Tracker

2023-04-11

4G GPS Tracker for vehicles custom

2023-04-23

fleet gps tracking sales

2023-04-23

gps tracker app

2023-04-11

Dog gps tracker wholesaler

2023-04-23

Vehicle tracking device

2023-03-16

4G GPS Tracker for vehicles

2023-03-16

gps vehicle tracker price

2023-04-11

G900LS 8 Lines-4G Car GPS Tracker

2025-03-31

TK100N- Multi functional GPS Tracker

2023-10-06

G183 serials -JOBD GPS Tracker

2022-09-06

G08L - 4inch Smart Tail Light Tracker

2022-06-20

TK103B

2022-06-20

The GPS system consists of three parts

2022-12-06

GPS Function Introduction

2022-11-02

GPS Logistics Tracking and Monitoring Application Solution

2023-02-02

GPS system verification

2022-11-10

How to realize the function of GPS monitoring system?

2022-08-18

The advantages of "Galileo" GPS positioning system

2023-02-11

How to use the Beidou GPS positioner.plug & play Obd gps tracker Processing

2023-04-14

What are the emphasis on the installation of the GPS positioner?rastreador de GPS wholesaler

2023-03-16

Gps speed limiter.The Role of GPS

2023-11-16

Beidou Navigation system-GPS system composition and working principle

2022-10-20

What are the built -in cards usually use in the car GPS positioner?gps tracker no monthly fee Manufa

2023-03-28

Handheld GPS navigation products will enter a period of rapid development.pet gps tracker cat wholes

2023-05-27

GPS Capabilities

2022-12-28

The GPS system consists of three parts

2022-12-06

Development Trend of Automobile GPS Positioning System

2022-12-07