Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Re: GPS module testing
what do you want to test?
1. sensitivity -- you need simulator
2. Timing -- PPS (pulse per second), coneect it to a oscilator or a timing source to measure accuracy.
3. CEP -- log position data.
....
Hpoe this helps in deciding,
BRM
snr and cnr
SNR = signal to noise ratio, this is computed over a large bandwidth for example, CDMA signal power to noise power
CNR = Carrier to noise ratio, Ideally computed over a Hz bandwidth. The carrier power is used.
Usually CNR =SNR + 10log(BW) for obvious reasons
wavecom wmod2 at commands
I had a similar modem and this was basically reset or reconfigured using the commands in the usermanual. Connect to hyperterminal and execute the commands.
Hope this helps,
Madhukar
I had been using GPS + GSM (wavecom) board for this. You basically need to decode the NMEA or the binary messages from the GPS Rx and convert it to the SMS format and send it to the Modem.
You get boards from all major GPS vendors -- SiRF, u-trax, ....
All you need is to handle the RS232...
Re: Matlab???
matlab (mathworks.com) is a simulation software.
It basically provides environment where you can do your calculations.
It has librariers that provide tools for simplifying your calculations.
(For example you can do a cascade analysis by writing the equatos in either excel or in...
Re: DAC noise floor
Its is just one of the things that affects your noise floor. Nrmally you far out phase noise of the PLL will be more dominant ... taht's what I have usually seen.
6N gives the SNR for Nyquist ampling, normall DACs are over sampled, then you need to add the contribution due...
difference between rc and lc
RC or LC can build either LPF/HPF
LC can build BPF also
--- R ----- is a LPF. Replace R by L it is a second oder LPF. swap Comps to
| get HPF
C
|
---
----L--C---- is BPF
---- L||C -- is BRF/Notch...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
