1.1

(Racal Decca quote 0.8 and 2 respectively in their specifications.)

1.2

(Racal Decca quote 32 dB.)

1.3

(Racal Decca quote 35 m.)

1.4

(Siemens Plessey quote 0.55 and 2.5 respectively in their data summary.)

1.5

(Siemens Plessey quote a figure of not less than 41.5 dB for this radar.)

1.6

The transverse resolution of the system R ?? = 7400 0.032/3.4 = 70 m. This could be improved on considerably because of good SNR at such short ranges. For an airfield controller to use these measurements to position an aircraft with a mean error of 25 m appears to be very good. An error of 25 m at 4 n. mile (= 7.4 km) reduces to 6.3 m at 1 n. mile and in the evaluation the error did not in fact exceed 6 m. Assuming a runway length of 1 n. mile, this should be sufficiently accurate for a bad-weather landing.

1.7