© The Institution of Electrical Engineers
Receivers for the Decca Navigator system have recently been developed in which a single, frequency-agile receiving channel, operating under microprocessor control, replaces the five single-frequency channels of a conventional receiver. The paper describes techniques which allow such receivers to utilise the multipulse lane-identification and the zone-identification transmissions of the Decca chain which were designed for receivers with multiple channels. An algorithm is described by means of which the microprocessor calculates zones and zone fractions from samples of the phases of the transmissions received. Operational results, measured under conditions of night-time skywave propagation, are presented which demonstrate that the technique works successfully and that it has certain advantages over conventional methods of multipulse and zone-identification reception.
References
-
-
1)
-
C. Powell
.
Performance of the Decca Navigator on land.
IEE Proc. F, Commun., Radar & Signal Process.
,
4 ,
241 -
248
-
2)
-
J.D. Last ,
D.K. Linsdall
.
Automatic microprocessor-based receivers for the Decca Navigator system.
Radio & Electron. Eng.
,
281 -
289
-
3)
-
C. Powell
.
The Decca Navigator system for ship and aircraft use.
Proc. IEE
,
9 ,
225 -
235
-
4)
-
C. Powell
.
Dectra: a long-range navigational aid.
J. Br. IRE
,
277 -
292
-
5)
-
(1976)
, The Decca Navigator systems — principles and performance.
-
6)
-
Last, J.D., Scholefield, C.: `The combined use of low-frequency radio and dead-reckoning for automatic vehicle location', Proceedings of DGON International symposium on land vehicle navigation, July 1984, Münster, W. Germany, p. 14.1–14.19.
http://iet.metastore.ingenta.com/content/journals/10.1049/ip-f-1.1986.0072
Related content
content/journals/10.1049/ip-f-1.1986.0072
pub_keyword,iet_inspecKeyword,pub_concept
6
6