(aka Radio-Mailles)

The Radio-Mailles System is the French name for this hyperbolic radionavigation system which was  proposed by Pierre Gaudilère who passed away on April 13th, 1960. In English, it is known as RADIO MESH SYSTEM or alternately, the RADIO WEB SYSTEM.

In France, it was being developed by the Société Francaise des Télécommunications and in the U.S.A. by Stavid Engineering Incorporated. It is a system where a low frequency modulation of the transmitters is used for the creation of hyperbolic lines.

Contrary to the usual hyperbolic systems, slightly different modulation frequencies were used. Thus, a moving interference pattern is produced. The hyperbolic lines, were called  "isophases"  by  Gaudilère (equiphase lines in English) , and they moved at a certain speed which is dependent upon the modulation frequencies that were selected. They covered  the whole area between the transmitting stations.

The Radio Mesh System was proposed for the following applications with carrier frequencies suitable to air and marine navigation :

(a) Navigation and position fixing on board.
(b) Traffic control with the indication of the position of the craft at fixed control centers
together with a selective communication system for air to ground communication.
(c) Collision prevention which required an airborne or shipborne means of determining the position or the neighbouring craft.

Radio Mesg used two transmiiters  whos modulating frequerncy was determined by the area to be covered. The transmitters and receivers with modulation and measuring facilities and indicating instruments were still under development in the time frame when this description was being written in the textbook. A test installation for position fixing had been set up in the Paris area. Unfortunately, the reference material does not say if the Radio Mesh system went into use.


1) Radio Navigation Systems by W. Baus, 1963 page 127

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MAy 11/22