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Re: [Discuss-gnuradio] gnu Radio and Mode S (1090 MHz)

From: Andrew Rich
Subject: Re: [Discuss-gnuradio] gnu Radio and Mode S (1090 MHz)
Date: Tue, 23 Mar 2010 07:12:58 +1000

Thanks Matt

I am making good progress as I teach myslef to decode Mode S using a DSO and perl

*                                                                    *
* Mode S decoder using Digital Scope and perl on openSUSE LINUX      *
* Andrew Rich - March 2010                                           *
*                                                                    *
Sample rate             10MS/s
Max sample              71
Cut off                 35.5
Array is                4000 points
Trigger                 on point 1094
Start count             1096
Pre-amble               Match
DF starts               at 1176
DF value                17
Type                    ADS-B squitter
Address                 75008F
FT value                is 11
Type Airborne Position NUC = 7 25 m < HPL < 185.2 m (0.1nm)

----- Original Message ----- From: "Matt Ettus" <address@hidden>
To: "Andrew Rich" <address@hidden>
Cc: "Nick Foster" <address@hidden>; "gnuradio" <address@hidden>
Sent: Tuesday, March 23, 2010 3:07 AM
Subject: Re: [Discuss-gnuradio] gnu Radio and Mode S (1090 MHz)

On 03/16/2010 10:52 PM, Andrew Rich wrote:
Thanks Nick

I have some more questions if I may

1) What determines the bandwidth of the daughter boards for USRP ?

The bandwidth is limited by the data rate back to the computer, so with the USRP1 you get 8 MHz of RF BW, and with the USRP2 you get 25 MHz. The exception is the TVRX daughterboard which has SAW filters that limit you to 6 MHz.

2) Where do you connect if you want to bypass the RF board and connect
at base band ?

Use the LFRX daughterboards instead.  They give you baseband inputs.

3) Will I be able to achieve what I want to achieve on openSUSE linux ?


4) When you talk about "code" what language ?

C++, Python, or using GRC which is a graphical design system.

5) What is a trunk when you talk about gnu ? is that the software base ?


6) I assume I can get an RF board and do 1030 MHz as well ?

Yes.  The DBSRX will receive that frequency, as will the WBX and RFX900/

7) Can I use perl to do any of this ?

Probably not.

8) Would someone be able to guide me through this.

9) Is a "PC" suitable and quick enough to keep up with the signals ?


Does the USRP and code lag or is there plenty of time left over ?

Not sure what this means. People have done what you are trying to do already and it works.


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