IEEE - Aerospace and Electronic Systems - September 2019 - 59

Grifﬁths et al.

Figure 5.
Two pages from H€
ulsmeyer's British patent in 1904.

Some sources-particularly the British scientist Sir
Robert Watson-Watt who developed the Chain Home
radar system in the UK in the late 1930s-maintain that
H€ulsmeyer's invention could not properly be called a
radar because it did not measure range (the term "radar,"
standing for radio detection and ranging, had first been
introduced in the USA on 19 November 1940). This is not
strictly true, since a development of H€ulsmeyer's invention, detailed in a subsequent patent granted on 2 April
1906, did indeed measure target range. But as well as that,
we have no difficulty today in speaking of police Doppler
radars - which measure target velocity but not range.
There is a certain irony that Watson-Watt's celebrated
Daventry Experiment in 1935 did not measure target range
either [7].

Pritchard records a letter sent in 1949 by H€
ulsmeyer's
daughter Annelise to Winston Churchill [4], pointing out
H€
ulsmeyer's work and achievements, but the reply was
cursory. Just after this, she married an engineer named
Erich Hecker, and he wrote again, both to Churchill and to
the British Patent Office, but to no avail. Annelise was
instrumental in collecting documents related to her father

Figure 7.
Figure 6.
H€
ulsmeyer (centre) and Watson-Watt (left) meeting in 1953.

SEPTEMBER 2019

Plaque at H€ulsmeyer's house in D€usseldorf commemorating his
life and achievement [6].

IEEE A&E SYSTEMS MAGAZINE

59

IEEE - Aerospace and Electronic Systems - September 2019

Table of Contents for the Digital Edition of IEEE - Aerospace and Electronic Systems - September 2019

Contents
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