GNSS Frequency Guide

This helpful application can be used to select and look up GNSS frequencies and signal locations. The GNSS Frequency Guide is based on the LabSat 3 Wideband's integral web interface which enables you to setup and manage the GNSS testing program from a PC.

You can see a demo of the LabSat 3 Wideband Internal HTML Interface here.

 

 
SELECT SIGNAL DISPLAY
 
 
 
GPS
   
     Galileo
   
     GLONASS
   
     BeiDou
   
     Other
   
Show individual signals

SELECT BANDWIDTH
10 MHz    30 MHz    56 MHz   

SELECT NUMBER OF SIGNAL BANDS
1 Band    2 Bands    3 Bands

SIGNAL QUANTIZATION
Current quantization:


CENTRE FREQUENCY
Move coloured bandwidth boxes in diagram above to change centre frequencies (press left mouse button and drag to left or right)
Band 1: 1575Mhz-1575Mhz
1575Mhz
Band 2: 1575Mhz-1575Mhz
1575Mhz
Band 3: 1575Mhz-1575Mhz
1575Mhz

How to use the GNSS Frequency Guide

Move the coloured bandwidth boxes in diagram above to change the centre frequencies, press the left mouse button and drag to left or right. Select your bandwidth, select your required frequencies and look up the available quantisation levels.

Example

  1. Select signal display: All signals including 'show individual signals'.
  2. Select '56 MHz' bandwidth.
  3. Select one signal band '1 Band'.
  4. Note quantisation is 3 bits.
  5. Move the red box to select the centre frequency.
  6. Select different bandwidth/channels to explore full capability.

Bandwidth Setting

LabSat 3 Wideband has three bandwidth settings. 56 MHz, 30 MHz and 10 MHz.

The bandwidth of the GNSS signals varies, for example a GPS L1 C/A code signal has a bandwidth of 24 MHz. However, due to the signal design a bandwidth of 9.66 MHz will capture enough data to allow the receiver under test to acquire, track and navigate as with LabSat 3 single, dual and triple constellation devices.

Other signals with a different signal design like Galileo E1 PRS signal has a bandwidth of 46 MHz and a signal design spread across the bandwidth.

Many other signals have a similar requirement like GPS L1/L2 P code and M code. LabSat 3 Wideband has been designed to capture all these signals.

Frequency Setting

LabSat 3 Wideband is designed to capture and replay GNSS signals in the upper L-Band (1559 - 1610 MHz) and lower L-Band (1164 - 1300 MHz).

Quantisation setting

LabSat 3 Wideband can record and replay GNSS Signals at quantisation levels of:

  • 3 bits (3 bit I + 3 bit Q)
  • 2 bits (2 bit I + 2 bit Q)
  • 1 bits (1 bit I + 1 bit Q)
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