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:

vehicle gps tracker wholesale

4G GPS Tracker for vehicles distributors

G01 Smallest Personal Old People Mini GPS Tracker for Kids

The manufacturer shared the function of GPS navigation with everyone.gps tracker with magnet price

GPS positioning anti lost device comparison.gps tracker auto webfleet solutions

Last article:Handheld GPS Device

Next article:GPS helps you avoid electronic eyes

Related Information

4G GPS Tracker for vehicles Production

2023-04-23

gps vehicle tracker Factory

2023-04-11

Gps speed limiter price

2023-04-23

fleet gps tracking distributors

2023-04-23

car gps tracker custom

2023-04-23

Gps speed limiter Vendor

2023-04-23

gps vehicle tracker supplier

2023-04-11

gps tracker for bike Factory

2023-04-23

Car gps tracking price

2023-04-11

pet gps tracker cat

2023-03-16

3000mAh Magnet Asset GPS Tracker

2025-03-31

TK100N- Multi functional GPS Tracker

2023-10-06

G08L - 4inch Smart Tail Light Tracker

2022-06-20

G500L -4G OBD GPS Tracker

2022-09-06

G01 Smallest Personal Old People Mini GPS Tracker for Kids

2022-06-19

What does the gps fee for buying a car mean?

2022-08-12

GPS early warning

2022-07-27

The manufacturer summarizes the main application scope of Xi'an's long standby GPS.obd2 gps tracker

2023-04-08

The concept and composition of the car positioning terminal.gps tracker no monthly fee wholesaler

2023-04-04

GPS tracker, what do you want to use?

2022-09-17

GPS module.gps vehicle tracker Solution

2023-07-12

GPS, more and more closely connected with our life.realtime gps tracker online company

2023-04-18

GPRS/CDMA GPS antenna.gps tracker online Manufacturing

2023-08-02

How to choose the antenna module of the car GPS positioner?Best hidden gps trackers

2023-03-22

Main features of gps tracker

2022-09-19

GPS signal is briefly introduced

2022-11-02

Several Important Factors of Vehicle GPS Satellite navigation.personal gps tracker supplier

2023-06-16

gps vehicle tracker.How to Implement Global Positioning System

2023-11-16

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

2023-05-27

gps vehicle tracker.What are the installation requirements for GPS locators reflected in

2023-10-17