[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

*Subject*: Re: [amsat-bb] True doppler calculation question*From*: "Don Woodward" <dbwoodw@xxxxxxxxxx>*Date*: Mon, 3 May 2004 18:07:35 -0400

Cliff: Get a copy of Plan13 and study it - most us it as the basis I believe. It was originally a BASIC program but somewhere there is a "C" version I downloaded. Here's a description I found of the BASIC version... PLAN-13 Satellite Position Calculation Program 1990 Oct No. 85 p.15-25 (See also 1983 Dec) - The basic routines needed for satellite calculations. Includes fundamental equations, explanation and heavily commented listing. Shows how to compute Orbit, MA, mode, range, azimuth, elevation, squint, range rate, doppler shift, height, sub-satellite point, footprint circle, day numbers, dates, Sun's position, solar azimuth, solar elevation, illumination, eclipses, visibility etc etc. Routines widely used by other authors. Booklet available, $10 US. It is available on-line as the file: ftp://ftp.amsat.org/amsat/articles/g3ruh/a111.zip 73's Don Woodward KD4APP AMSAT 33535 http://kd4app.webhop.org ----- Original Message ----- From: "Cliff Buttschardt" <cbuttsch@kcbx.net> To: <amsat-bb@AMSAT.Org> Sent: Monday, May 03, 2004 17:44 Subject: [amsat-bb] True doppler calculation question There is little doubt that doppler correction is going to be mandatory for future satellite operation. It appears that doppler correction mathematics differs in obtaining that correction. At the CUBESAT earth station we use a FT847 with an identical interface with MacDoppler Pro and Nova. We get markedly differing compensation! Simultaneously using an IC 910 with Instant tune and Fodtrak, a third compensation results. How is doppler correction calculated "at the satellite" in these programs and are similar protocols used? Cliff K7RR AMSAT LM1606 ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**References**:**True doppler calculation question***From:*Cliff Buttschardt

- Prev by Date:
**True doppler calculation question** - Next by Date:
**Re: EchoLink Conference Server** - Prev by thread:
**True doppler calculation question** - Next by thread:
**Re: True doppler calculation question** - Index(es):