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Semi-active radar homing

SARHsemi-activesemi-active homing
The military uses continuous-wave radar to guide semi-active radar homing (SARH) air-to-air missiles, such as the U.S. AIM-7 Sparrow and the Standard missile family.
Semi-active missile systems use bistatic continuous-wave radar.

Doppler radar

DopplerDoppler navigationDoppler navigation radar
Continuous-wave (CW) radar uses Doppler, which renders the radar immune to interference from large stationary objects and slow moving clutter.
Coherent pulsed (CP),

Continuous wave

CWcontinuous-wavecontinuous-wave operation
Continuous-wave radar is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects.
Morse code is all but extinct outside the amateur service, so in non-amateur contexts the term CW usually refers to a continuous-wave radar system, as opposed to one transmitting short pulses.

Radar

radar stationradarsradar system
Continuous-wave radar is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects.
This technique can be used in continuous wave radar and is often found in aircraft radar altimeters.

Radar altimeter

radio altimeterradar altimetryelectronic altimeter
This kind of radar is often used as "radar altimeter" to measure the exact height during the landing procedure of aircraft.
Alternatively, Frequency Modulated Continuous-wave radar can be used.

Pulse-Doppler radar

Dopplerpulse-Dopplerpulse doppler
Most modern air combat radars, even pulse Doppler sets, have a CW function for missile guidance purposes.
It combines the features of pulse radars and continuous-wave radars, which were formerly separate due to the complexity of the electronics.

Wave radar

radar
It is also used as early-warning radar, wave radar, and proximity sensors.
A continuous wave frequency modulated (CWFM) or pulsed radar waveform is normally used to provide range resolution.

Feed-through null

Feed-through null is typically required to eliminate bleed-through between the transmitter and receiver to increase sensitivity in practical systems.
Feed-through null follows the duplexer and is commonly used with continuous-wave radar to improve performance.

Radar gun

speed gunradar speed gunradar
This is a typical problem with radar speed guns used by law enforcement officers, NASCAR events, and sports, like baseball, golf, and tennis.
A second limitation for hand-held devices is that they have to use continuous-wave radar to make them light enough to be mobile.

Radio

radio communicationradio communicationswireless
Continuous-wave radar is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects.

Clutter (radar)

clutterground clutterradar clutter
Continuous-wave (CW) radar uses Doppler, which renders the radar immune to interference from large stationary objects and slow moving clutter.

Early-warning radar

early warning radarearly warningair search radar
Costly early-warning CW angle track (CWAT) radar operating beyond 100 km for use with surface-to-air missile systems

Air-to-air missile

air-to-airair-to-air missilesAAM
The military uses continuous-wave radar to guide semi-active radar homing (SARH) air-to-air missiles, such as the U.S. AIM-7 Sparrow and the Standard missile family.

United States

American🇺🇸U.S.
The military uses continuous-wave radar to guide semi-active radar homing (SARH) air-to-air missiles, such as the U.S. AIM-7 Sparrow and the Standard missile family.

AIM-7 Sparrow

Sea SparrowSparrowAIM-7
The military uses continuous-wave radar to guide semi-active radar homing (SARH) air-to-air missiles, such as the U.S. AIM-7 Sparrow and the Standard missile family.

Standard Missile

SM-2StandardSM-1
The military uses continuous-wave radar to guide semi-active radar homing (SARH) air-to-air missiles, such as the U.S. AIM-7 Sparrow and the Standard missile family.

Radio wave

radio wavesradioradio signal
The launch aircraft illuminates the target with a CW radar signal, and the missile homes in on the reflected radio waves.

Frequency domain

frequency-domainfrequencyspectral analysis
Frequency domain receivers used for continuous-wave Doppler radar receivers are very different from conventional radar receivers.

Doppler effect

Dopplerdoppler shiftDoppler shifts
Return frequencies are shifted away from the transmitted frequency based on the Doppler effect when objects are moving.

NASCAR

National Association for Stock Car Auto RacingNASCAR NEXTNASCAR Racing
This type of radar is typically used with competition sports, like golf, tennis, baseball, and NASCAR racing.

Speed of light

clight speedvelocity of light
The Doppler frequency change depends on the speed of light in the air (c’ is slightly slower than in vacuum) and v the speed of the target:

Line-of-sight propagation

line of sightline-of-sightradio horizon
Continuous-wave radar without frequency modulation (FM) only detects moving targets, as stationary targets (along the line of sight) will not cause a Doppler shift.

Beat (acoustics)

beatbeatingbeats
Echoes from a target are then mixed with the transmitted signal to produce a beat signal which will give the distance of the target after demodulation.

Sine wave

sinusoidalsinusoidsine
Sine wave, like air raid siren