Battle Operation of YLC-6M Radar System
The battle operation of YLC-6M radar refers to activities that operators adjust radar’s operation modes, cancellation area, display setting, signal processing setting, communication setting, and etc. according to various conditions such as target, display, landmark, weather and jamming.
YLC-6M radar generally operates in normal operation state. It operates in anti-weather operation state when there is weather interference. It uses different anti-jamming operation modes if there is hostile active jamming. Now, we describe the battle operation of YLC-6M radar respectively.
Normal Operation
Operation modes
The normal operation of YCL-6M radar refers to operation in the condition of weak weather echo and without electromagnetic jamming. In this case, there is only fixed ground clutter, so the radar adopts MTD operation mode, i.e., normal non-weather operation mode.
Operation range and antenna rotation rate
When YLC-6M radar is being used for air surveillance, its operation range can be adjusted to 200km, 150km and 120km according to different air surveillance volumes and data rates. For general air surveillance task, 200km and 150km range can be selected. Its corresponding antenna rotation rate is 6rpm. If 12rpm is used in the two ranges, the number of echoes in a single beam of the radar system will be decreased by a factor of 2. It will greatly increase the processing loss of the radar system so as to have a certain effect on the radar coverage range. Thus, it is not suggested that 12rpm is used in the operation range of 150km and 200km. 120km operation range corresponds to 12rpm antenna rotation rate. In this operation mode, radar’s data rate will be increased by a factor of 2. It is mainly used for the search and surveillance of low altitude fast targets so as to rapidly form tracks and provide the command and control system with more target information.
Selection of MTD filter bank
In MTD operation mode, filter bank I, filter bank II and filter bank III on the master monitoring console respectively represent four different filter banks as follows:
Filter bank I (clutter area):
Filter zero depth£-60dB (±14Hz bandwidth)
Sidelobe level£-30dB
Zero frequency filters are shut off.
Filter bank II (clutter area)
Filter zero depth £-60dB (±12Hz bandwidth)
Sidelobe level £-30dB
Zero frequency filters are shut off.
Filter bank III (clutter area)
Filter zero depth £-60dB (±30Hz bandwidth)
Sidelobe level £-13dB
Zero frequency filters are shut off.
Filter 0 (non-clutter area)
8 best matching filters (covering the whole range of all the filters, filter I, filter II and filter III)
Filter bank I and filter bank II have similar functions. They are used in the case that there is ground clutter around the radar and the clutter spectrum is narrow. If there is light weather clutter, filter bank III can be selected. This filter bank has better spectrum rejection performance in frequency domain (30Hz).
The specific operation method is to respectively push down the three buttons for filter bank I, II and III on the master monitoring console, which are interlocked one another. In this case, the corresponding MTD filter bank (i.e., filter bank I, or filter bank II or filter bank III) operates. Filter 0 operates when all the three buttons are bounced up.
Selection of dynamic/static clutter map
In the signal processor subsystem, there are 8 kinds of preset static dynamic clutter maps (static STC control). 0# means there is no STC control (i.e., full 0 for STC). STC control amount (theory value) increases successively from 1#~7# clutter map.
When the radar arrives at some site, power it on to observe the landmark around the radar. If the landmark occupies a smaller area and has a weaker strength, the static clutter map with smaller STC control amount will be selected (such as 1# and 2#). Otherwise, the static clutter map with larger STC control amount (such as 6# and 7#) will be selected. If the landmark range is large and beyond the control range of the static clutter control map (for example, there is stronger ground clutter at a range of 80km.) and the strength of the landmark is strong, both a proper static clutter map and a dynamic clutter map will be used in order to reject ground clutter better.
Selection of dynamic/static clutter contour map
Clutter contour map is a map to control the cancellation of ground clutter, i.e., to control whether filter 0 in the filter bank of the signal processor subsystem is switched on or not. There are 4 kinds of static clutter contour maps in the radar signal processor subsystem. 0# clutter contour map refers to non-cancellation in full range (i.e., when cancellation is carried out in all the coverage, 0# filter is switched off.). 1# to 3# clutter contour maps respectively correspond to the cancellation within the range out to 50km, 100km and full range.
When the radar arrives at some site, turn it on to observe the landmark around the site. Different static clutter contour maps are selected based on the range of the landmark away from the radar site. For example, when the ground echo is in a range of 87km away from the radar or the main radar observation direction, the static clutter contour map within 100km should be selected. In order to make a further rejection on the ground clutter, dynamic clutter contour map might be selected, which can automatically establish clutter contour map in two dimensions (azimuth and range) based on the static clutter contour map and make cancellation processing within it.
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| PPI picture without cancellation on some radar site |
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| PPI picture after a clutter contour map is selected |
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| PPI picture after a dynamic clutter contour map is selected ---------------------------------------------------------------------------- AL-BIK... |
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