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Re: Programming question - dish angle



Hi Phil,

Would you believe? In the old days, companies actualy
SOLD ROMS with SIN/COS lookup tables? Yes, a look-up
table is a simple ways to do it.

Cheers,
Tony AA2T

---

At 04:50 PM 10/7/2003 +1000, Phil wrote:

>Hello everyone,
>
>I'm looking for ideas. I have some code that counts the azimuth and elevation
>pulses from my dish rotator and then displays the positions on a 2 line 16
>character LCD display.
>
>There is a direct correlation between counted pulses for azimuth position but
>not for elevation. I apply the cos rule to get the dish angle based on the
>length of the actuator arm. So far so good.
>
>It seems like a good idea to have a PIC take over the roles of pulse counting
>and display because the CPU is already pretty busy with Doppler correction
>calculations and uplink aerial positioning, plus other Amateur Radio related
>tasks. However, I can't think of any way to calculate the elevation angle
>using the PIC's instruction set.
>
>How do pulse counting controllers usually accomplish this feat? Look-up 
>tables
>maybe?
>
>--
>Regards,
>Phil.
>
>
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