Hi Ben, I have some experience in developing a pulse transmitter for radar applications with HackRF. In the simplest version, I have used the "Vector Source Block" of GNURadio with this vector:
np.hstack((np.ones(int(tau*samp_rate)), np.zeros(int((pri-tau)*samp_rate)))) where tau is the pulse duration (width), pri is the pulse repetition interval and samp_rate is the sampling rate. You can add afterwards, for example, a "Root Raised Cosine Filter" to shape your pulse... Regards, José -----Mensaje original----- De: HackRF-dev [mailto:hackrf-dev-boun...@greatscottgadgets.com] En nombre de hackrf-dev-requ...@greatscottgadgets.com Enviado el: sábado, 21 de julio de 2018 7:28 Para: hackrf-dev@greatscottgadgets.com Asunto: HackRF-dev Digest, Vol 71, Issue 1 Send HackRF-dev mailing list submissions to hackrf-dev@greatscottgadgets.com To subscribe or unsubscribe via the World Wide Web, visit https://pairlist9.pair.net/mailman/listinfo/hackrf-dev or, via email, send a message with subject or body 'help' to hackrf-dev-requ...@greatscottgadgets.com You can reach the person managing the list at hackrf-dev-ow...@greatscottgadgets.com When replying, please edit your Subject line so it is more specific than "Re: Contents of HackRF-dev digest..." Today's Topics: 1. Newbie questions related to RADAR emulation project (Ben Greear) ---------------------------------------------------------------------- Message: 1 Date: Fri, 20 Jul 2018 16:50:22 -0700 From: Ben Greear <gree...@candelatech.com> To: hackrf-dev@greatscottgadgets.com Subject: [Hackrf-dev] Newbie questions related to RADAR emulation project Message-ID: <5b7a86f0-d68f-0647-a120-a4043ab32...@candelatech.com> Content-Type: text/plain; charset=utf-8; format=flowed Hello! First, I'm really enjoying the hackrf so far. Thanks to all of you who helped make it possible. My current application is to make it into a pulse generator. I have it basically working, but I am not sure how efficient it is or if it will scale to larger time intervals... I am programatically building the vector and passing it to the API like this. Also, I know how to program, but I am a newbie at python as well as hackrf. self.blocks_vector_source_x_0 = blocks.vector_source_c(vector, True, 1, []) I build the vector like this: # globals vector = [0] ... # Build our vector for i in range(0, pulse_count): vector += [1]*pulse_width vector += [0]*pulse_interval # Minus 1 because we add a leading zero since I am ignorant of python an its syntax vector += [0]*((sweep_time * 1000) - 1) My main concern is that the sweep-time I want to support is often large (like multiple seconds or even minutes). The vector is going to be really huge if I pad it with that many zeros. Is there a better way to have a set of short bursts, and then tell the radio to stop transmitting for a while before repeating again? Thanks, Ben -- Ben Greear <gree...@candelatech.com> Candela Technologies Inc http://www.candelatech.com ------------------------------ Subject: Digest Footer _______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev ------------------------------ End of HackRF-dev Digest, Vol 71, Issue 1 ***************************************** _______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
