ISG-98

Height Finder


Detail:

Height Finder ISG-98
Used in conjunction with FPS-3

Function

Radar Set ISG-98 will be a V Beam height finding equipment employing components built to specification for AN/FPS-5 Radar. It will, however, utilize "Vee Beam" height finding technique (as in CFP-6B) and, in association with search radar FPS-3, will provide complete range, azimuth and elevation information necessary for CGI usage.

Innovations

  1. "Vee" beam height finding technique incorporated - the antenna of the FPS-3 search radar being utilized to provide the vertical beam.
  2. The ISG-98 is mounted on a tower separately from the associated FPS-3 but azimuth rotation is synchronized with rotation of FPS-3 at 6.6 or 10 rpm; when MTI is used with FPS-3, a fixed speed of 6.6 rpm only will be available.
  3. Using two ISG-98 height finders with one FPS-3, height readings on individual targets will be obtainable at intervals not exceeding 20 seconds. This meets the presently stated Controller requirements.

Development and Production

It was the original intention to utilize FPS-5 height finders but this equipment employs the "beaver tail" aerial nodding system and would have inadequate traffic handling capacity to meet RCAF operational requirements. A specification has therefore been prepared based on US AN/FPS-5 but changed to "Vee Beam" technique to increase the traffic handling capacity. Contract has been let to Canadian Marconi Company for re-engineering and production of eight equipments the first of which is expected to be delivered April 1951. Cost $398,000 each inclusive of installation costs.

Performance

  1. Range - see coverage diagram for FPS-5.

Range Scale

Range Resolution

Range Accuracy

80 miles

0.13 miles

+/- 2 %

20 miles

0.037 miles

+/- 2 %

  1. Azimuth Resolution 1.13 degrees.
  2. Elevation Accuracy +/- 500 feet relative

Search

  1. Continuous azimuth rotation through 360 degrees synchronized with FPS-3 search radar at 6.6 or 10 rpm.

Antenna Specification

(a) Cut paraboloid approximately 15 feet high 3 feet 2 inches wide. Exact dimensions not yet determined.

 

Locations:

Edgar, ON

31 AC&W Squadron

ISG-98

1952-

Falconbridge, ON

33 AC&W Squadron

ISG-98

1952-1956

Foymount, ON

32 AC&W Squadron

ISG-98

1952-

Parent, QC

14 AC&W Squadron

ISG-98

1952-1955

Senneterre, QC

34 AC&W Squadron

ISG-98

1953-1955

St. Margarets, NB

21 AC&W Squadron

ISG-98

1953-1954

Photos:


 

Updated: February 15, 2002