PDF DABS Link Performance Considerations

FAA-RD-74-186

Project Report ATC-41

DABS Link Performance Considerations

G.J. Schlieckert

28 April 1975

Lincoln Laboratory

MASSACHUSETTS INSTITUTE OF TECHNOLOGY

LEXINGTON, MASSACHUSETTS

Prepared for the Federal Aviation Administration, Washington, D.C. 20591

This document is available to the public through the National Technical Information Service, Springfield, VA 22161

This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof.

1. RePor, N.. FAA-RE-74-186

4. Title ond Subti?le

2. Governm en, Accass ion No.

DABSLifi PerformanceConsiderations

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S. Recip; an?s Co+alog No.

5. Report Date

28 April 1975

6. Pa, form;ng O,gan; ,o,; on Code

7, A.,ho, (,)

G. J. Schlie&ert

9. Performing

Qrga. izo?ion Name and Address

Massachuset&hstimte of Tecbolosy Lincok hkratory P.o. bx 73 Lexington,Massachusetts 02173

i2. Spenso,, "g kgen Gy Name a"d Address

Deparmentof Transportation: FederalAviationAdmtiis@ati"'~ SystemsReseard andDevelopmenst ertice... Washington;DC. . 20591

15. S,,,,plemen,oN,yole$

8. Pe,formin9

O,gon; zotion Repmt So.

ATC41

10. Work Unf, No. (T I{AIS) 45364

ProjectNo. 0S4-241412

11, Con,,.

The excess signal power over the receiver threshold level is defined as the .

link !Imargin. !! For ideal free space conditions this factor is given by the

expression:

Mf~ = Ptt Ggt Gat CX-L-2010g10

R- MUSL

(1)

where

= free space margin (dB) `fs

Pt

= transmitted power (dBm )

Gg(c, n) = free space ground antenna gain at elevation angle e above

horizon and azimuth angle ~ from boresight (dBi) Ga(o, ~) = aircraft antenna gain at aspect angles Q, p in aircraft

coordinate system (dBi)

20 log (k/4T) (1 = wavelength in nautical miles)

CA

=

L

= fixed system losses other than mismatch losses at the

antenna (dB ) .

R

range in nautical miles

MUSL

= minimum usable signal level for correct message decoding

.

(dBm)

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