Comments suggested by "Target tracking with a network of Doppler radars"

The writer has been collecting information on current radars for the forthcoming International Radar Directory CD-ROM. He has collected open information on radars of the world; for over 20 years to date he has identified 9,800 radars from about 400 manufacturers in 30 countries. He claims that it would be helpful for authors to prepare a short addendum to their paper to briefly present the technical characteristics of any Doppler measurement hardware contained in their references.