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 vehicle tracking

apple airtags

TK103B

GPS trackers can be used however you want

Car GPS Navigation System

Last article:Handheld GPS Device

Next article:GPS helps you avoid electronic eyes

Related Information

car gps tracker supplier

2023-04-23

Gps speed limiter custom

2023-04-23

gps vehicle tracker Solution

2023-04-11

simple gps tracking manufacture

2023-04-23

GPS Tracking custom

2023-04-11

gps vehicle tracker custom

2023-04-23

OBD GPS Tracker custom

2023-04-11

rastreadores gps

2023-03-16

pet gps tracker cat wholesale

2023-03-16

4G LTE gps tracker

2023-03-16

G183 serials -JOBD GPS Tracker

2022-09-06

3000mAh Magnet Asset GPS Tracker

2025-03-31

G900LS J16-4G Car GPS Tracker

2023-10-06

G06L

2022-06-21

YG119- Hunting Dog GPS tracker

2023-10-07

Car GPS Navigation System Operation

2022-11-04

GPS positioning cannot break through due boundaries.gps tracker device Processing

2023-06-13

The reasons and solutions for the slow reaction of the GPS screen.realtime gps tracker online Soluti

2023-05-06

GPS vehicle satellite positioning simulation system design

2023-02-06

GPS Navigator

2022-08-08

Where is the GPS positioner generally installed.gps tracker with magnet distributors

2023-04-10

Whether GPS positioning is GPS navigation.obd-II port gps tracker manufacture

2023-05-09

Positioner manufacturer tells the role of car GPS positioner.gps tracker for trailer Vendor

2023-06-08

Handheld GPS Device

2022-08-18

Car positioning tracker.mileage tracking webfleet solutions

2023-02-24

What should I do if the position of the car's GPS positioning system is incorrect?real-time gps trac

2023-09-19

The development of GPS

2022-10-13

Features of GPS

2023-02-17

What should be considered in addition to the positioning and navigation performance when choosing GP

2022-10-28

Principles of GPS system positioning.Magnetic gps tracker company.gps tracker for Car supplier

2023-07-13