Operations Specialist (OS) A School Test 7 – Radar Operations Practice Test

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• What is the primary purpose of adjusting CFAR thresholds in radar signal processing?
• Which type of material returns great detail in radar contact composition?
• What is a track gate and how is it used?
• Which parameter, when increased, will generally increase the radar's range, assuming other factors remain constant?
• In STC tuning, Rough controls require what?
• MTI stands for Moving Target Indication. What is its primary purpose on a shipboard radar?
• In coherent integration, what is preserved across pulses to enable Doppler processing?
• What is the purpose of a contacts list in OS CIC operations?
• Which scan type allows a pencil beam to search a 360-degree pattern with a helical scan?
• During a high noise level event in radar operation, which action should be logged?
• What is MTI and how does it improve radar performance?
• What is a range bin?
• What determines the horizon limit in radar range calculations?
• What is the difference between a 'genuine track' and a 'ghost track'?
• Which scan type is cone-shaped beam designed for precision tracking?
• What is a velocity gate in radar tracking?
• What does the radar velocity annunciator (ΔV) indicate about a target?
• Sea clutter mitigation methods typically include which approach?
• What is the basic range-resolution formula for pulsed radar and the key variables?
• In radar track maintenance, what is the purpose of a coast or update function?
• A calibration check after maintenance is performed primarily to verify that the radar meets specifications for which aspects?
• How do correlation and tracking differ in radar data processing?
• How is aliasing in Doppler processing avoided?
• What are sea clutter and weather clutter, and how are they mitigated on radar?
• Explain the difference between windowing and clutter suppression in Doppler processing.
• What is the difference between Range-While-Scan (RWS) and Track-While-Scan (TWS)?
• What are the consequences of misinterpreting a bearing due to parallax?
• Doppler shift is the frequency change caused by relative motion. What is its primary role in radar?
• What is a CFAR algorithm and its purpose in radar processing?
• Which band is associated with maritime search radars and meteorological aids?
• What is a range gate and how is it used in target detection?
• What is the purpose of a boresight check in radar alignment?
• What is the effect of scattering on radar energy?
• What is Automatic Gain Control (AGC) in radar and how does it affect detection?
• Calibration is used to ensure radar measurements stay accurate over time. Which of the following best describes a calibration test?
• Which scan type continuously scans 360 degrees in azimuth?
• Which environmental factor is noted as allowing longer radar range in calm seawater?
• What is the difference between axis alignment (boresight) and actual ship coordinates in radar calibration?
• Land clutter mitigation commonly uses which combination of techniques?
• Which scan type is cone-shaped beam, high frequency, high PRF, narrow pulse, and narrow bandwidth, designed for precision tracking?
• When ambiguous contacts are close together, how should they be resolved?
• What is a PPI display and what does its center represent?
• The range scale on a radar display primarily determines what?
• What happens to wave distance when PRF is fast?
• A radar with a shorter pulse width will have which effect on minimum range?
• What is jamming?
• If a radar operator wants greater unambiguous range at the expense of velocity accuracy, which PRF setting should be used?
• Anti Jamming Controls serve to accomplish which purpose?
• Doppler resolution and MTI performance: what is it?
• What is 'track-while-scan' and why is it important?
• In a PRR context, what is a stated effect of increasing frequency?
• True Bearing is defined as which of the following?
• Radar Cross Section is a measure of a contact's ability to reflect radar signals back to the receiver. Which option best describes RCS?
• Which action specifically reduces false targets by suppressing stationary clutter during MTI operation?
• How does antenna beamwidth affect resolution and scanning speed?
• Composite materials can lead to which radar return effect?
• In STC tuning, which statement is correct regarding Calm controls?
• Tuning: IS Feature serves to minimize interference with what?
• In radar tracking, what happens during a coasting interval when a contact has no new detections?
• Which statement best describes STC tuning’s effect?
• What term describes how far you can 'see' with radar?
• What is the role of calibration in radar operation?
• Which method reduces radiated EMI?
• How does a radar operator distinguish between a real contact and a ghost in radar plotting?
• Which statement best describes gating's role in tracking?
• What is the typical height range for the Troposphere that is relevant to radar operations?
• What is the stated relationship between frequency and detection range?
• What is the relationship between radar scan rate and contact update rate?
• What is the purpose of a safety risk assessment when operating radar equipment?
• What does modifying AGC adjust in radar operation?
• Which factor most degrades bearing accuracy?
• Which statement about Maximum Range best reflects the listed components?
• What does EMCON refer to in tactical operations?
• What is coastal clutter and how is it mitigated?
• Which of the following is NOT a recommended action when a radar alarm indicates high noise levels?
• Which scan type uses a cone-shaped beam optimized for precision target tracking?
• Explain the role of clutter suppression in MTI and its effect on false alarms.
• Which of the following is a documented EMI suppression technique?
• What is the primary role of MTI in radar?
• Frequency Diversity is a protective strategy that does what?
• Radar Tuning: FTC (Rain) reduces rain effects and can help with reducing the effects of jamming. Which circuit behavior is associated with FTC?
• Define unambiguous range and its relationship to PRF.
• Which is an EMI suppression technique?
• Which component is specifically noted as the primary limiting factor for Maximum Range?
• How does antenna size influence beamwidth and why does that matter?
• What are common radar jamming types and their effects?
• Which factor most directly influences how often a tracked contact's position is updated?
• What is the purpose of plotting a target position on a ship’s radar plot?
• The AN/SPS-67 is described as what type of radar?
• Which of the following is NOT a step in performing a radar sweep for a search pattern?
• Increasing the range scale on a radar display generally results in which outcome?
• Which processing technique helps suppress stationary returns to emphasize moving targets?
• What is the purpose of IFF in radar operations?
• How does a higher false alarm rate affect track management, and what control helps mitigate it?
• What happens to wave distance when PRF is slow?
• Why is gain control important, and what happens if gain is set too high or too low?
• What is the difference between coherent and non-coherent integration in radar signal processing?
• What is the impact of target aspect angle on radar returns?
• Cycle is defined as which of the following?
• What is the role of cross-cueing in radar operations?
• Frequency Band A is used for:
• Relative Bearing changes depending on what factor?
• How does sea state affect radar returns?
• Which factor can cause refraction to bend a radar beam so it travels further than a straight line would suggest?
• In radar terms, which statement best describes the relationship between a contact and a track?
• Which scan type is used to cover a rectangular area by sweeping horizontally and vertically?
• Detection of EMCON can result through the use of which method?
• Dwell time in radar operations is the time the radar spends scanning a sector. What is the effect of longer dwell on detection and overall coverage?
• How would you handle a contact that continuously shows up on the radar but is not a real target (electromagnetic interference)?
• Increasing PRF generally has what effect on the radar's unambiguous range?
• In radar plotting, what is the purpose of cross-checking with other sensors when determining if a contact is real?
• What is the purpose of a bearing measurement in navigation and how is it obtained from radar data?
• Track While Scan (TWS) is a radar mode described as scanning while maintaining and updating targets. What is its main advantage?
• Most radars operate in which atmospheric layer?
• How does a radar operator differentiate surface targets from aerial targets?
• RF Energy travels at the speed of what?
• RF Terms: Amplitude is the measurement of what?
• If Doppler processing shows suspect velocity values, what is a recommended action?
• What is a blind sector in radar operation?
• Electromagnetic Interference is caused by which sources?
• What role does clutter suppression play in radar tracking?
• Frequency Agility refers to switching between RF bands in what manner?
• CFAR stands for Constant False Alarm Rate. What is its primary purpose?
• State the impact of PRF on unambiguous range and velocity measurements.
• Differentiate between a 'contact' and a 'track' in radar operations.
• What does a 'tentative' track mean, and how does it transition to a 'confirmed' track?
• What is the role of proper filter settings in radar signal processing?
• Which of the following is a direct result of a successful calibration check?
• Radar Tuning: STC (Sea State) is used to reduce the effects of what?
• EMCON denies useful intel to enemies targeting what kind of intercept and collection?
• Which of the following is NOT listed as a factor affecting Radar Cross Section?
• Minimum Range describes what?
• In performing a radar sweep for a search pattern, what is typically done first?
• What is the purpose of squelch thresholds on radar video?
• What would you observe on a radar scope when the system is jammed?
• Which action is explicitly stated as part of radar sweep operations to ensure continuous monitoring?
• Diffraction is best described as...
• What factors influence range accuracy on a naval radar?
• What is a false target and how can radar operators mitigate to reduce false alarms?
• Bearing accuracy is best described as how close the measured bearing is to the true bearing. What factors influence bearing accuracy?
• What is range-rate in radar terminology?
• Radio Frequency Energy is transmitted by a radar. When it strikes an object, what is reflected back to the radar's receiver and presented visually on a scope?
• Amplitude in RF terms is described as?
• In naval radar operations, what is a plot?
• How does PRF staggering help resolve range/velocity ambiguities?
• What best describes a surface duct?
• Frequency Band F is used for:
• How does Doppler processing help differentiate moving targets from stationary clutter?
• After initial acquisition, what must a contact do to be considered valid for tracking?
• In clutter mitigation, what is a clutter map used for?
• Which statement best describes the purpose of MTI/CFAR in radar tracking?
• What does a range-velocity (R-V) plot display?
• How is a track initiated in radar operations?
• Why is it important that scale selection provides appropriate range and resolution?
• Name the main radar operating modes used in OS radar operations and their purposes.
• In radar plotting, which description best defines a ghost?
• What is the significance of a safe range when plotting a contact?
• PRR stands for:
• In OS CIC operations, which description best captures how a contacts list is used?
• Antenna size is related to frequency; which statement is correct?
• Define false alarm rate and how to control it.
• Rain clutter is typically mitigated by which processing?
• Which scan type sweeps with a narrow beam to cover a large airspace?
• For open sea and longer range, which pulse size is preferred?
• Frequency is best described as:
• Azimuth is defined as an angular measurement in which plane and direction?
• Which pair of variables is plotted on a range-velocity (R-V) plot?
• What is the primary purpose of the Plan Position Indicator (PPI) on a naval radar?
• What is the scan rate in radar terminology?
• What is the difference between acquisition and tracking in radar terms?
• Which statement best describes the relationship between dwell time and coverage rate?
• What combination of factors helps distinguish surface from aerial targets?
• How can you determine the motion direction of a target from radar data?
• What describes a surface duct in atmospheric propagation?
• How does a radar's antenna rotation rate influence detection coverage?
• Which statement best describes a Track-While-Scan (TWS) operation?
• What is the maximum effective range in radar terminology?
• Radar horizon refers to...
• Which scan type is designed to move a pencil beam up and down in a helical scan?
• The Pulse Selector Switch affects:
• The AN/SPS-73 is described as what type of radar?
• Wavelength is defined as:
• Which weather effects most commonly degrade radar performance?
• What is the difference between range resolution and azimuth resolution?
• What does ECCM stand for and give a basic example of a technique?
• Long pulse size is best suited for:
• Which term best describes the loss of RF wave strength due to scattering or absorption in the atmosphere?
• Which procedure is used to inspect and verify radar alignment?
• What is scale selection, and why is it critical?
• What is a track gate in radar tracking?
• What is the practical meaning of the common radar horizon concept?
• What function does the Pulse Repetition Frequency (PRF) serve in radar operation?
• Which problem can occur if PRF is not properly chosen with respect to Doppler processing?
• Which scan type sweeps with a narrow beam to cover airspace?
• In radar tracking, what is gating?
• Describe how you would perform a basic radar calibration check.
• How does increasing PRF speed affect radar imaging?
• Attenuation refers to...
• Pulse width is best described as:
• Which option correctly identifies a benefit of anti jamming controls?
• How does aliasing occur in radar and how can you avoid it?
• Short pulse size is typically used for:
• Which factor is explicitly identified as a primary limiting factor for maximum range?
• How does weather-related clutter typically get reduced in radar processing?
• Which statement about Doppler processing and clutter is true?
• How does weather affect radar performance and what adjustments help?
• What effect does increased air density have on radar beams according to refraction concepts?
• In a pulsed radar system, what is the effect of increasing bandwidth on range resolution?
• What feature of radar performance is improved by larger antenna aperture?
• Which pulse size is typically used for navigation and close-range operations?
• Calibration targets are used to calibrate which aspects of the radar system during checks?
• Which technique is used to suppress stationary clutter to highlight moving targets?
• Cycle is defined as which of the following?
• What is the return signal from an object that radar displays on the scope called?
• Which mode is used to suppress stationary clutter to reveal moving targets?
• Which scan type tracks targets while it scans them?
• What effect can the ionosphere have on radar?
• Which materials do not return great detail in radar contact composition?
• In radar tracking, what is the purpose of gating to maintain tracks?
• What is the purpose of a calibration target on radar checks?
• Gating in radar processing is used to?
• Bearing/angular resolution and beamwidth: how are they determined and why does it matter?
• What effect can weather have on radar?
• Absorption describes...
• Which scan type uses a thin beam to cover a rectangular area with horizontal and vertical sweeps, primarily used in air interception?