WO2022039708A1 - Sensor system with microwave altimeter and a method thereof - Google Patents

Sensor system with microwave altimeter and a method thereof Download PDF

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Publication number
WO2022039708A1
WO2022039708A1 PCT/TR2021/050824 TR2021050824W WO2022039708A1 WO 2022039708 A1 WO2022039708 A1 WO 2022039708A1 TR 2021050824 W TR2021050824 W TR 2021050824W WO 2022039708 A1 WO2022039708 A1 WO 2022039708A1
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WO
WIPO (PCT)
Prior art keywords
signal
baseband
free space
applying
antenna unit
Prior art date
Application number
PCT/TR2021/050824
Other languages
French (fr)
Inventor
Selçuk ÇAYLAR
Yiğit ÜRKMEZTÜRK
Berat ATMACA
Deniz BALABAN
Sadettin ÖZEN
Original Assignee
Roketsan Roket Sanayi̇i̇ Ti̇caret A.Ş.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Roketsan Roket Sanayi̇i̇ Ti̇caret A.Ş. filed Critical Roketsan Roket Sanayi̇i̇ Ti̇caret A.Ş.
Publication of WO2022039708A1 publication Critical patent/WO2022039708A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/882—Radar or analogous systems specially adapted for specific applications for altimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
    • G01S13/28—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
    • G01S13/284—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S13/581—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse modulated waves and based upon the Doppler effect resulting from movement of targets
    • G01S13/582—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse modulated waves and based upon the Doppler effect resulting from movement of targets adapted for simultaneous range and velocity measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/883—Radar or analogous systems specially adapted for specific applications for missile homing, autodirectors

Definitions

  • the present invention relates to a distance measurement system that allows for measuring the altitude of a missile with respect to the surface of the earth by means of applying microwave radio-frequency radiation on board of the missile to the surface of the earth and by processing the signals reflected from the surface and a method thereof.
  • Radar altimeters and proximity sensors perform measurement processes by means of applying microwave radio-frequency (RF) radiation to the surface and processing the signals reflected from the surface.
  • the first known measurement techniques are the continuous wave and the pulsed radar techniques.
  • a relative velocity constitutes a Doppler frequency in these techniques.
  • Amplitude estimation is performed from the resulting Doppler frequency window in the continuous wave method, and in the pulse-Doppler technique, on the other hand, distance estimation is performed by means of a method for measuring latency time.
  • the patent document numbered "US6407697” was examined as a result of the preliminary search conducted in the state of the art.
  • the invention described in said application discloses a radar altimeter for determining the altitude of an air vehicle with respect to the ground.
  • the invention comprises receiving a reflected radar signal from the ground, and processing the received digital samples by demodulating, and outputting altitude data by means of generating digital samples of the signal.
  • the patent application numbered “US7812761” comprises detecting the position and velocity of a target by emitting a radio wave with respect to the target and receiving and analyzing a reflected signal from the target.
  • the invention comprises a computing part that allows for computing a sum signal and a difference signal of received signals and estimating a Doppler frequency of one or multiple targets based on a phase difference between the sum signal and the difference signal.
  • the high-power requirement in the pulse-Doppler technique, and low-resolution distance estimations based on parameters such as characteristics of the reflecting surface of the continuous wave method and the angle of approach thereof are the drawbacks of said methods.
  • these methods are sensitive to the electronic warfare effects due to the techniques they use.
  • the Frequency modulation wave technique was began being used with the development of voltage-controlled oscillators.
  • the Frequency Modulated Continuous Wave radar technique was began being used with the development of electronic component technology.
  • a modulated RF signal whose frequency is constantly changing in a certain frequency band is transmitted to the surface, and distance information is obtained by means of measuring the difference frequency between the frequency of the reflected and returning signal and the frequency of the signal that is transmitted at that moment. It is the most commonly used method at present. Its sensitivity to electronic warfare systems persists although the measurement resolution thereof has improved compared to previous methods.
  • the most important object of the present invention is to measure the distance by means of applying microwave RF radiation to the surface of the earth over the missile and by processing the signals reflected from the surface.
  • Another important object of the present invention is to reduce electronic warfare weakness.
  • Another important object of the present invention is to enhance the low probability detection capability thereof by means of reducing the power output of the radar transmissions to a lower level than the technologies in the literature.
  • Yet another object of the present invention is to prevent the transmissions that are performed from being deciphered for the purpose of deception since the transmissions are coded with a coding array.
  • Yet another object of the present invention is to complicate the transmission that is performed by the proximity of RF waves to the noise floor.
  • FIGURE 1 illustrates a schematic flowchart of the inventive sensor system with microwave altimeter.
  • FIGURE 2 illustrates a flowchart view of the process steps of the inventive sensor method with microwave altimeter.
  • the present invention relates to a distance measurement system that allows for measuring the altitude of a missile with respect to the surface of the earth by means of applying microwave radio-frequency radiation on board of the missile to the surface of the earth and by processing the signals reflected from the surface and a method thereof.
  • the inventive sensor system with microwave altimeter (100) that allows for calculating the altitude of a missile with respect to the surface of the earth comprises a radio frequency module (200) and an antenna unit (300).
  • Data generator (101 ) creates the time information referenced data array of the sensor system with microwave altimeter (100).
  • Data distribution unit (102) applies a direct distribution algorithm of the sensor system with microwave altimeter (100) to the array that is created by data generator (101 ) by means of using pulse compression technique.
  • Baseband signal modulator (103) allows for applying signal modulation in the baseband to the data that is obtained from the data distribution unit (102).
  • Radio frequency module (200) modulates the signal that is obtained from baseband signal modulator (103) to high frequency. Radio frequency module (200) adjusts the RF output power by means of amplifying the signal power. Radio frequency module (200) allows for filtering the signal that is reflected from the free space with a bandpass filter, thereby applying a low noise amplifier and obtaining intermediate frequency by demodulating.
  • Baseband signal demodulator (105) allows for demodulating the signal in the baseband.
  • the synchronizer (104) ensures that synchronization is performed with the transmitted signal that is in communication with the data distribution unit (102) and the adapter (106).
  • the antenna unit (300) allows for transmitting the electromagnetic wave obtained from the radio frequency module (200) to the free space.
  • the antenna unit (300) allows for conveying the electromagnetic wave that is transmitted to the free space and that is reflected from the earth's surface to the radio frequency module (200).
  • the adapter (106) ensures that the relation between the measurements is analyzed.
  • the adapter (106) ensures that the direct distribution algorithm is decoded.
  • the range Doppler decoder (107) allows for obtaining the distance and Doppler information.
  • the processor (108) enables the necessary calculations and operations to be performed on the sensor system with microwave altimeter (100).
  • the external communication interface (109) provides the information calculated by the processor (108) is presented to an external user by means of an interface.
  • the internal communication interface (1 10) provides the information calculated by the processor (108) is presented to the users by means of an interface.
  • the power distribution unit (1 1 1 ) is a unit that comprises ports for electrical power, serial channel, and communication and that allows for distributing the electrical power requirements of units connected to ports thereof in a protected and controlled manner.
  • the sensor method with microwave altimeter which allows for measuring the distance over the missile to the surface of the earth, performs said measurement by means of implementing certain process steps. These process steps are given in detail below.
  • the time information referenced data array is created by means of the data generator (1001 ).
  • a direct distribution algorithm is applied to the array by means of the data distribution unit using the pulse compression technique (1002).
  • a signal modulation in the baseband is applied by means of the baseband signal modulator (1003).
  • the signal is modulated to high frequency and the radiofrequency output power is adjusted by means of amplifying the signal power via radio frequency module (1004).
  • the electromagnetic wave is transmitted to the free space by means of the antenna unit (1005).
  • electromagnetic wave transmitted to free space by the antenna unit propagates and reflects from the ground surface (1006).
  • the electromagnetic wave is conveyed from free space to the transmission line via the antenna unit (1007).
  • the signal reflected is filtered with the band-pass filter, a low noise amplifier is applied to the signal, and intermediate frequency is obtained by demodulating by means of the radio frequency module (1008).
  • the signal is demodulated in the baseband by means of the baseband signal demodulator (1009). Correlation is performed via adapter by providing synchronization by means of synchronizer with the signal transmitted (1010).
  • the direct distribution algorithm is decoded by means of the adapter (101 1 ) and ultimately, the distance and Doppler information is obtained by means of range Doppler decoder (1012).
  • data can be transferred at the noise level such that it has a high correlation rate, gets distributed to a long data array, wide frequency band, and time interval. Since the information transmitted at the noise level is difficult to detect and may be changed continuously with special coding methods, resistance against detection and jamming is higher than the available systems. The distance measurement resolution is higher, and the error tolerance is lower than other methods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The present invention relates to a distance measurement system that allows for measuring the altitude of a missile with respect to the surface of the earth by means of applying microwave radio-frequency radiation to the surface of the earth over the missile and by processing the signals reflected from the surface and a method thereof.

Description

SENSOR SYSTEM WITH MICROWAVE ALTIMETER AND A METHOD THEREOF
Technical Field of the Invention
The present invention relates to a distance measurement system that allows for measuring the altitude of a missile with respect to the surface of the earth by means of applying microwave radio-frequency radiation on board of the missile to the surface of the earth and by processing the signals reflected from the surface and a method thereof.
State of the Art
Radar altimeters and proximity sensors perform measurement processes by means of applying microwave radio-frequency (RF) radiation to the surface and processing the signals reflected from the surface. The first known measurement techniques are the continuous wave and the pulsed radar techniques.
A relative velocity constitutes a Doppler frequency in these techniques. Amplitude estimation is performed from the resulting Doppler frequency window in the continuous wave method, and in the pulse-Doppler technique, on the other hand, distance estimation is performed by means of a method for measuring latency time.
The patent document numbered "US6407697" was examined as a result of the preliminary search conducted in the state of the art. The invention described in said application discloses a radar altimeter for determining the altitude of an air vehicle with respect to the ground. The invention comprises receiving a reflected radar signal from the ground, and processing the received digital samples by demodulating, and outputting altitude data by means of generating digital samples of the signal.
The patent application numbered “US4894659” in the state of the art relates to an aircraft microwave altimeter system comprising a means for transmitting microwave signals to the ground, receiving microwave signals reflected from the ground, and processing the information of the received signal.
In the state of the art, the patent application numbered “US7812761” comprises detecting the position and velocity of a target by emitting a radio wave with respect to the target and receiving and analyzing a reflected signal from the target. The invention comprises a computing part that allows for computing a sum signal and a difference signal of received signals and estimating a Doppler frequency of one or multiple targets based on a phase difference between the sum signal and the difference signal.
In the state of the art, the high-power requirement in the pulse-Doppler technique, and low-resolution distance estimations based on parameters such as characteristics of the reflecting surface of the continuous wave method and the angle of approach thereof are the drawbacks of said methods. In addition, these methods are sensitive to the electronic warfare effects due to the techniques they use.
In the state of the art, the Frequency modulation wave technique was began being used with the development of voltage-controlled oscillators. The Frequency Modulated Continuous Wave radar technique was began being used with the development of electronic component technology. In this technique, a modulated RF signal whose frequency is constantly changing in a certain frequency band is transmitted to the surface, and distance information is obtained by means of measuring the difference frequency between the frequency of the reflected and returning signal and the frequency of the signal that is transmitted at that moment. It is the most commonly used method at present. Its sensitivity to electronic warfare systems persists although the measurement resolution thereof has improved compared to previous methods.
There is no system that substantially reduces the electronic warfare weakness of FMCW, and pulsed radar technologies used in the state of the art, and that allows for enhancing the low probability detection capability thereof by means of reducing the power output of the radar transmissions to a lower level than the technologies available in the literature. Consequently, the above-mentioned drawbacks and inadequacy of the available solutions necessitated making an improvement in the related technical field.
Objects of the Invention
The most important object of the present invention is to measure the distance by means of applying microwave RF radiation to the surface of the earth over the missile and by processing the signals reflected from the surface.
Another important object of the present invention is to reduce electronic warfare weakness.
Another important object of the present invention is to enhance the low probability detection capability thereof by means of reducing the power output of the radar transmissions to a lower level than the technologies in the literature.
Yet another object of the present invention is to prevent the transmissions that are performed from being deciphered for the purpose of deception since the transmissions are coded with a coding array.
Yet another object of the present invention is to complicate the transmission that is performed by the proximity of RF waves to the noise floor.
The structural and characteristic features and all the advantages of the present invention will be understood more clearly by means of the following figures and the detailed description written by making references to said figures. Therefore, the respective evaluation should be conducted by taking these figures and the detailed description into consideration.
Description of the Figures
FIGURE 1 illustrates a schematic flowchart of the inventive sensor system with microwave altimeter.
FIGURE 2 illustrates a flowchart view of the process steps of the inventive sensor method with microwave altimeter. Reference Numerals
100. Sensor System with Microwave Altimeter
101. Data Generator
102. Data Distribution Unit
103. Baseband Signal Modulator
104. Synchronizer
105. Baseband Signal Demodulator
106. Adapter
107. Range Doppler Demodulator
108. Processor
109. External Communication Interface
110. Internal Communication Interface
111. Power Distribution Unit
200. Radio Frequency Module
300. Antenna Unit
1001. Creating time information referenced data array by means of the data generator
1002. Applying a direct distribution algorithm to an array by means of the data distribution unit using pulse compression technique
1003. Applying signal modulation in the baseband by means of baseband signal modulator 1004. Modulating signal to high frequency and adjusting the radio-frequency output power by means of amplifying the signal power via radio frequency module
1005. Transmitting electromagnetic waves to free space by means of the antenna unit
1006. Propagating the electromagnetic wave transmitted to free space by the antenna unit and wave's reflection from the ground surface
1007. Conveying electromagnetic waves from free space to transmission line via the antenna unit
1008. Filtering the signal that is reflected with a band-pass filter, applying a low noise amplifier to the signal, and obtaining intermediate frequency by demodulating by means of the radio frequency module
1009. Demodulating the signal in the baseband by means of baseband signal demodulator
1010. Correlating via adapter by providing synchronization by means of synchronizer with the signal that is transmitted
1011. Decoding the direct distribution algorithm by means of the adapter
1012. Obtaining distance and Doppler information by means of range Doppler decoder
Description of the Invention
The present invention relates to a distance measurement system that allows for measuring the altitude of a missile with respect to the surface of the earth by means of applying microwave radio-frequency radiation on board of the missile to the surface of the earth and by processing the signals reflected from the surface and a method thereof. The inventive sensor system with microwave altimeter (100) that allows for calculating the altitude of a missile with respect to the surface of the earth comprises a radio frequency module (200) and an antenna unit (300).
Data generator (101 ) creates the time information referenced data array of the sensor system with microwave altimeter (100).
Data distribution unit (102) applies a direct distribution algorithm of the sensor system with microwave altimeter (100) to the array that is created by data generator (101 ) by means of using pulse compression technique.
Baseband signal modulator (103) allows for applying signal modulation in the baseband to the data that is obtained from the data distribution unit (102).
Radio frequency module (200) modulates the signal that is obtained from baseband signal modulator (103) to high frequency. Radio frequency module (200) adjusts the RF output power by means of amplifying the signal power. Radio frequency module (200) allows for filtering the signal that is reflected from the free space with a bandpass filter, thereby applying a low noise amplifier and obtaining intermediate frequency by demodulating.
Baseband signal demodulator (105) allows for demodulating the signal in the baseband.
The synchronizer (104) ensures that synchronization is performed with the transmitted signal that is in communication with the data distribution unit (102) and the adapter (106).
The antenna unit (300) allows for transmitting the electromagnetic wave obtained from the radio frequency module (200) to the free space. The antenna unit (300) allows for conveying the electromagnetic wave that is transmitted to the free space and that is reflected from the earth's surface to the radio frequency module (200).
The adapter (106) ensures that the relation between the measurements is analyzed.
The adapter (106) ensures that the direct distribution algorithm is decoded. The range Doppler decoder (107) allows for obtaining the distance and Doppler information.
The processor (108) enables the necessary calculations and operations to be performed on the sensor system with microwave altimeter (100).
The external communication interface (109) provides the information calculated by the processor (108) is presented to an external user by means of an interface.
The internal communication interface (1 10) provides the information calculated by the processor (108) is presented to the users by means of an interface.
The power distribution unit (1 1 1 ) is a unit that comprises ports for electrical power, serial channel, and communication and that allows for distributing the electrical power requirements of units connected to ports thereof in a protected and controlled manner.
The sensor method with microwave altimeter, which allows for measuring the distance over the missile to the surface of the earth, performs said measurement by means of implementing certain process steps. These process steps are given in detail below.
First, the time information referenced data array is created by means of the data generator (1001 ). Subsequently, a direct distribution algorithm is applied to the array by means of the data distribution unit using the pulse compression technique (1002). A signal modulation in the baseband is applied by means of the baseband signal modulator (1003). The signal is modulated to high frequency and the radiofrequency output power is adjusted by means of amplifying the signal power via radio frequency module (1004). The electromagnetic wave is transmitted to the free space by means of the antenna unit (1005).
Subsequently, electromagnetic wave transmitted to free space by the antenna unit propagates and reflects from the ground surface (1006). The electromagnetic wave is conveyed from free space to the transmission line via the antenna unit (1007). The signal reflected is filtered with the band-pass filter, a low noise amplifier is applied to the signal, and intermediate frequency is obtained by demodulating by means of the radio frequency module (1008). The signal is demodulated in the baseband by means of the baseband signal demodulator (1009). Correlation is performed via adapter by providing synchronization by means of synchronizer with the signal transmitted (1010). The direct distribution algorithm is decoded by means of the adapter (101 1 ) and ultimately, the distance and Doppler information is obtained by means of range Doppler decoder (1012).
In the distance measurement method proposed by the present invention, data can be transferred at the noise level such that it has a high correlation rate, gets distributed to a long data array, wide frequency band, and time interval. Since the information transmitted at the noise level is difficult to detect and may be changed continuously with special coding methods, resistance against detection and jamming is higher than the available systems. The distance measurement resolution is higher, and the error tolerance is lower than other methods.

Claims

9
CLAIMS A sensor method with microwave altimeter that allows for measuring the distance from the missile to the surface of the earth, characterized in that, it comprises the process steps of;
• Creating time information referenced data array by means of data generator (101 ) (1001 ),
• Applying a direct distribution algorithm to an array by means of data distribution unit (102) using pulse compression technique (1002),
• Applying signal modulation in the baseband by means of baseband signal modulator (103) (1003),
• Modulating signal to high frequency and adjusting the radio-frequency output power by means of amplifying the signal power via radio frequency module (200) (1004),
• Transmitting electromagnetic waves to free space by means of the antenna unit (300) (1005),
• Propagating the electromagnetic wave transmitted to free space by the antenna unit (300) and wave's reflection from the ground surface (1006),
• Conveying electromagnetic waves from free space to transmission line via antenna unit (300) (1007),
• Filtering the signal that is reflected with the band-pass filter, applying a low noise amplifier to the signal, and obtaining intermediate frequency by demodulating by means of the radio frequency module (200) (1008),
• Demodulating the signal in the baseband by means of baseband signal demodulator (105) (1009),
• Correlating via adapter (106) by providing synchronization by means of synchronizer (104) with the signal that is transmitted (1010),
• Decoding the direct distribution algorithm by means of the adapter (106) (101 1 ),
• Obtaining distance and Doppler information by means of range Doppler decoder (107) (1012).
PCT/TR2021/050824 2020-08-19 2021-08-18 Sensor system with microwave altimeter and a method thereof WO2022039708A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2020/13126A TR202013126A2 (en) 2020-08-19 2020-08-19 MICROWAVE ALTIMETER SENSOR SYSTEM AND METHOD
TR2020/13126 2020-08-19

Publications (1)

Publication Number Publication Date
WO2022039708A1 true WO2022039708A1 (en) 2022-02-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023171A (en) * 1975-11-12 1977-05-10 The Singer Company Microwave velocity sensor using altimeter echo
EP0311312A2 (en) * 1987-10-07 1989-04-12 Smiths Industries Public Limited Company Radar altimeter systems
US5047779A (en) * 1990-08-28 1991-09-10 Honeywell Inc. Aircraft radar altimeter with multiple target tracking capability

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023171A (en) * 1975-11-12 1977-05-10 The Singer Company Microwave velocity sensor using altimeter echo
EP0311312A2 (en) * 1987-10-07 1989-04-12 Smiths Industries Public Limited Company Radar altimeter systems
US5047779A (en) * 1990-08-28 1991-09-10 Honeywell Inc. Aircraft radar altimeter with multiple target tracking capability

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