Re: [Discuss-gnuradio] Lunar imaging experiment

[Juha Vierinen]

Hi,

I forgot to mention that the interpulse period is 38 ms on  2017/07/04 at 01:21:00 UTC and 40 ms on 2017/07/05 02:04:00 UTC.

juha

On Mon, Jul 3, 2017 at 9:58 PM, Juha Vierinen <address@hidden> wrote:

Hi,

Just to let you guys know, I'll be radiating the moon with 1 MW and 36 dBi 49.92 MHz on 2017/07/04 at 01:21:00 UTC. The experiment will repeat also at  2017/07/05 02:04:00 UTC. Both experiments last about 15 minutes, when the Moon transits the radar beam.

In case somebody wants to tune in with their gear, here are some details. 

I'm using the Jicamarca radio observatory radar, which is located in Peru. The system is locked to GPS. The transmissions are binary phase coded pulses with 10 microsecond baud length, so a recording with >100 kHz bandwidth is needed. 

If you've got a GPS locked system, you should be able to produce a lunar synthetic aperture radar map, such as this one:

 http://www.haystack.mit.edu/~j/ns-depolarized.png

The phase code is a 13*13 bit Kroenecker product Barker code. The phases are listed here:

http://www.haystack.mit.edu/~j/b169.h5

In text form, the code is:

[ 1.  1.  1.  1.  1. -1. -1.  1.  1. -1.  1. -1.  1.  1.  1.  1.  1.  1.

 -1. -1.  1.  1. -1.  1. -1.  1.  1.  1.  1.  1.  1. -1. -1.  1.  1. -1.

  1. -1.  1.  1.  1.  1.  1.  1. -1. -1.  1.  1. -1.  1. -1.  1.  1.  1.

  1.  1.  1. -1. -1.  1.  1. -1.  1. -1.  1. -1. -1. -1. -1. -1.  1.  1.

 -1. -1.  1. -1.  1. -1. -1. -1. -1. -1. -1.  1.  1. -1. -1.  1. -1.  1.

 -1.  1.  1.  1.  1.  1. -1. -1.  1.  1. -1.  1. -1.  1.  1.  1.  1.  1.

  1. -1. -1.  1.  1. -1.  1. -1.  1. -1. -1. -1. -1. -1.  1.  1. -1. -1.

  1. -1.  1. -1.  1.  1.  1.  1.  1. -1. -1.  1.  1. -1.  1. -1.  1. -1.

 -1. -1. -1. -1.  1.  1. -1. -1.  1. -1.  1. -1.  1.  1.  1.  1.  1. -1.

 -1.  1.  1. -1.  1. -1.  1.]

Any reports of hearing the transmissions are appreciated. 

juha