The original Hawk system used 4 or in some models 6 radars: to detect (PAR and CWAR), to track (CWAR and HPIR) and to engage (HPIR and ROR) targets.
As the system was upgraded the functionality of some of the radars was merged.
The final iteration of the system consists of only 2 radars, an enhanced phased array search radar and an engagement radar (HPIR).

PAR Pulse Acquisition Radar
The pulse acquisition radar is a long-range, high-altitude search radar.

AN/MPQ-35 (Basic Hawk)
The search radar used with the basic Hawk system, with a radar pulse power of 450 kW and a pulse length of 3 µs, a Pulse Repetition Frequency of 800 and 667 Hz alternately.
The radar operates in the 1.25 to 1.35 GHz range.
The antenna is a 6.7 m × 1.4 m (22.0 ft × 4.6 ft) elliptical reflector of open lattice construction, mounted on a small two-wheeled trailer.
Rotation rate is 20 rpm, the BCC – Battery Control Central and the CWAR are synchronized by the PAR revolutions and the PAR system trigger.

AN/MPQ-50 (Improved Hawk to Phase III)
Introduced with the I-Hawk system, the improved-PAR.
The system introduces a digital MTI (Moving Target Indicator) that helps separate targets from ground clutter.
It operates in the 500 to 1,000 MHz (C-band) frequency range with a peak operating power of 1,000 watts.

Range (source Janes):
104 km (65 mi) (high PRF) to 96 km (60 mi) (low PRF) versus 3 m² (32 sq ft) target.

98 km (61 mi)(high PRF) to 90 km (56 mi) (low PRF) versus 2.4 m² (26 sq ft) target.

79 km (49 mi) (high PRF) to 72 km (45 mi) (low PRF) versus 1 m² (11 sq ft) target.

AN/MPQ-64 Sentinel (Hawk XXI)
A X-Band 3D range-gated doppler radar system used with the Hawk XXI system.
It replaces both the CWAR and PAR components of the Hawk system.
MPQ-64 Sentinel provides coverage out to a range of 75 km (47 mi), rotating at 30 rpm.
The system has a mean time between failure of around 600 hours, and can track at least 60 targets at once.
It can elevate up to +55 degrees and depress to −10 degrees.

CWAR Continuous Wave Acquisition Radar
This X Band Continuous wave system is used to detect targets.
The unit comes mounted on its own mobile trailer.
 The unit acquires targets through 360 degrees of azimuth while providing target radial speed and raw range data.

AN/MPQ-34 (Basic Hawk)
MPQ-34 Hawk CW Acquisition radar with a power rating of 200 W and a frequency of 10 GHz (X-Band) Built by Raytheon.
Replaced by MPQ-48.

AN/MPQ-48 (Improved Hawk)
The Improved Hawk version of the CW acquisition radar doubled the output power and improved the detection ranges:
Range (source Janes):
69 km (43 mi) (CW) to 63 km (39 mi) (FM) versus 3 m² (32 sq ft) target.

65 km (40 mi) (CW) to 60 km (37 mi) (FM) versus 2.4 m² (26 sq ft) target.

52 km (32 mi) (CW) to 48 km (30 mi) (FM) versus 1 m² (11 sq ft) target.

AN/MPQ-55 (Phase I – Phase II)
Hawk Improved Continuous Wave Acquisition Radar or ICWAR.
The output power is doubled to 400 W, this increases the detection range to around 70 km (43 mi).
The radar operates in the 10–20 GHz (J band).
Other features include FM ranging and BITE (Built in test equipment).
Frequency modulation is applied to the broadcast on alternate scans of the ICWAR to obtain range information.

AN/MPQ-62 (Phase III)
Some changes to the signal processing allow the radar to determine the targets' range and speed in a single scan.
A digital DSP system is added which allows a lot of the processing work to be done on the radar directly and forwarded directly via a serial digital link to the PCP/BCP.

HPIR High Power Illuminating Radar
The early AN/MPQ-46 High Power Illuminator (HPIR) radars had only the two large dish-type antennas side by side, one to transmit and one to receive.
The HPIR automatically acquires and tracks designated targets in azimuth, elevation and range.
It also serves as an interface unit supplying azimuth and elevation launch angles computed by the Automatic Data Processor (ADP) in the Information Coordination Centre (ICC) to the IBCC or the Improved Platoon Command Post (IPCP) for up to three launchers.
The HPIR J-band energy reflected from the t
The original Hawk system used 4 or in some models 6 radars: to detect (PAR and CWAR), to track (CWAR and HPIR) and to engage (HPIR and ROR) targets. As the system was upgraded the functionality of some of the radars was merged. The final iteration of the system consists of only 2 radars, an enhanced phased array search radar and an engagement radar (HPIR).
PAR Pulse Acquisition Radar
The pulse acquisition radar is a long-range, high-altitude search radar.
AN/MPQ-35 (Basic Hawk)
The search radar used with the basic Hawk system, with a radar pulse power of 450 kW and a pulse length of 3 µs, a Pulse Repetition Frequency of 800 and 667 Hz alternately. The radar operates in the 1.25 to 1.35 GHz range. The antenna is a 6.7 m × 1.4 m (22.0 ft × 4.6 ft) elliptical reflector of open lattice construction, mounted on a small two-wheeled trailer. Rotation rate is 20 rpm, the BCC – Battery Control Central and the CWAR are synchronized by the PAR revolutions and the PAR system trigger.
AN/MPQ-50 (Improved Hawk to Phase III)
Introduced with the I-Hawk system, the improved-PAR. The system introduces a digital MTI (Moving Target Indicator) that helps separate targets from ground clutter. It operates in the 500 to 1,000 MHz (C-band) frequency range with a peak operating power of 1,000 watts.
Range (source Janes):
104 km (65 mi) (high PRF) to 96 km (60 mi) (low PRF) versus 3 m² (32 sq ft) target.
98 km (61 mi)(high PRF) to 90 km (56 mi) (low PRF) versus 2.4 m² (26 sq ft) target.
79 km (49 mi) (high PRF) to 72 km (45 mi) (low PRF) versus 1 m² (11 sq ft) target.
AN/MPQ-64 Sentinel (Hawk XXI)
A X-Band 3D range-gated doppler radar system used with the Hawk XXI system. It replaces both the CWAR and PAR components of the Hawk system. MPQ-64 Sentinel provides coverage out to a range of 75 km (47 mi), rotating at 30 rpm. The system has a mean time between failure of around 600 hours, and can track at least 60 targets at once. It can elevate up to +55 degrees and depress to −10 degrees.
CWAR Continuous Wave Acquisition Radar
This X Band Continuous wave system is used to detect targets. The unit comes mounted on its own mobile trailer.  The unit acquires targets through 360 degrees of azimuth while providing target radial speed and raw range data.
AN/MPQ-34 (Basic Hawk)
MPQ-34 Hawk CW Acquisition radar with a power rating of 200 W and a frequency of 10 GHz (X-Band) Built by Raytheon. Replaced by MPQ-48.
AN/MPQ-48 (Improved Hawk)
The Improved Hawk version of the CW acquisition radar doubled the output power and improved the detection ranges:
Range (source Janes):
69 km (43 mi) (CW) to 63 km (39 mi) (FM) versus 3 m² (32 sq ft) target.
65 km (40 mi) (CW) to 60 km (37 mi) (FM) versus 2.4 m² (26 sq ft) target.
52 km (32 mi) (CW) to 48 km (30 mi) (FM) versus 1 m² (11 sq ft) target.
AN/MPQ-55 (Phase I – Phase II)
Hawk Improved Continuous Wave Acquisition Radar or ICWAR. The output power is doubled to 400 W, this increases the detection range to around 70 km (43 mi). The radar operates in the 10–20 GHz (J band). Other features include FM ranging and BITE (Built in test equipment). Frequency modulation is applied to the broadcast on alternate scans of the ICWAR to obtain range information.
AN/MPQ-62 (Phase III)
Some changes to the signal processing allow the radar to determine the targets' range and speed in a single scan. A digital DSP system is added which allows a lot of the processing work to be done on the radar directly and forwarded directly via a serial digital link to the PCP/BCP.
HPIR High Power Illuminating Radar
The early AN/MPQ-46 High Power Illuminator (HPIR) radars had only the two large dish-type antennas side by side, one to transmit and one to receive. The HPIR automatically acquires and tracks designated targets in azimuth, elevation and range. It also serves as an interface unit supplying azimuth and elevation launch angles computed by the Automatic Data Processor (ADP) in the Information Coordination Centre (ICC) to the IBCC or the Improved Platoon Command Post (IPCP) for up to three launchers. The HPIR J-band energy reflected from the t
MIM-23 Hawk