Projects:2021s1-13010 Socially Distant Radar - Revision history

A1742159: /* Conclusion and Results */

2021-10-27T05:53:41Z

‎Conclusion and Results

A1742159: /* Results */

2021-10-27T05:49:13Z

‎Results

A1742159: /* Conclusion */

2021-10-27T05:49:03Z

‎Conclusion

A1742159: /* Theory for Operation */

2021-10-24T03:22:25Z

‎Theory for Operation

A1742159: /* Theory for Operation */

2021-10-24T03:22:06Z

‎Theory for Operation

A1742159: /* Theory for Operation */

2021-10-24T03:21:36Z

‎Theory for Operation

A1742159: /* Method */

2021-10-24T03:18:03Z

‎Method

A1742159: /* Objectives */

2021-10-24T03:14:59Z

‎Objectives

A1742159: /* Advantages of passive radar */

2021-10-24T03:09:45Z

‎Advantages of passive radar

A1742159: /* Background */

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‎Background

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 == Conclusion and Results ==
-The research and literature review conducted has guided the decisions of this project in terms of selection and assembly of hardware components, as well as given insight on the different signal processing techniques and algorithms required to detect targets.
 Through testing, validation and guidance from the literature review, a passive radar box was able to be assembled and utilised as part of a passive radar system to detect and record targets. This consisted of physically synchronising 2 RTL-SDRs, sourcing and assembling Mini-Circuits components and a Yagi antenna, as well as constructing the enclosure for the hardware. The passive radar box was then thoroughly tested, which led to data being able to be successfully recorded during two trials for several targets.
 The recorded data was then able to be successfully processed to show the ambiguity plots for each recorded flight. To get to this stage in the software development, several simulated results were generated and tested to verify their functionality. These simulations included generating fake DAB, fake targets, multipath fading, and clutter removal.
 The results included several ambiguity plots showing an abnormal clutter line at approximately 40-50Hz, which were concluded to be either interference, a function of DAB itself, or a hardware issue. Further analysis of the bistatic geometry for the trial showed that the targets are expected to appear extremely close to the zero-Doppler line, as the angle between the transmitter to target and the flight path of the target was almost exactly 90 ̊. This meant that it was almost guaranteed for the target to be masked by clutter around the zero-Doppler line. It is recommended that further trials be conducted at a different location and analysing the bistatic geometry prior to trials.
 Overall, the project was successful in that is was able to address the major success criteria of providing Adelaide University the capability to record passive radar using the passive radar boxes, opening the opportunity for future students to collaborate with DSTG to extend and improve on the project.

← Older revision		Revision as of 05:49, 27 October 2021
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	[[File:PassiveRadarBox.png\|thumb\|center\|Passive Radar in a Box Hardware]]		[[File:PassiveRadarBox.png\|thumb\|center\|Passive Radar in a Box Hardware]]
−
−	~~== Results ==~~

	== Conclusion and Results ==		== Conclusion and Results ==

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 == Results ==
-== Conclusion ==
+== Conclusion and Results ==
 == References ==

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 view.
-[[File:Ellipsoids.jpg|thumb|Ellipsoids over Adelaide to detect aircraft]]
+[[File:Ellipsoids.jpg|thumb|center|Ellipsoids over Adelaide to detect aircraft]]
 === System Architecture ===

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 MATLAB to obtain results.
-[[File:PassiveRadarBox.png|thumb|Passive Radar in a Box Hardware]]
+[[File:PassiveRadarBox.png|thumb|center|Passive Radar in a Box Hardware]]
 == Results ==

← Older revision		Revision as of 03:21, 24 October 2021
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	[[File:Ellipsoids.jpg\|thumb\|Ellipsoids over Adelaide to detect aircraft]]		[[File:Ellipsoids.jpg\|thumb\|Ellipsoids over Adelaide to detect aircraft]]
		+
		+	=== System Architecture ===
		+	A custom 2-channel RF passive radar box was developed which included an
		+	amplifier and filter. Each signal is fed into a PC running GNU Radio software which
		+	records the data to file. The recorded data then undergoes post-processing in
		+	MATLAB to obtain results.
		+
		+	[[File:PassiveRadarBox.png\|thumb\|Passive Radar in a Box Hardware]]

	== Results ==		== Results ==

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 These advantages can all be attributed to the use of an existing transmitter as the reference signal for the passive radar system. Some examples of transmitters include FM radio, DAB radio, DVB-T or digital television signals, and GSM or cellular network.
-== Method ==
+== Theory for Operation ==
 == Results ==

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 == Objectives ==
-The objective of this project is to be able to detect and localise targets with a multistatic passive radar system utilising digital audio broadcasting (DAB) illumination in South Australia. With the use of a multistatic network to localise targets to latitude, longitude, and altitude.
+This project aims to demonstrate an operational passive radar system using
 == Background ==

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 === Advantages of passive radar ===
 There are many advantages of using passive radar, many of these are of significant interest to the defence industry, particularly for air defence systems because it provides situational awareness. The main benefits of passive radar are listed below:
-•	Since an existing transmitter is used, the passive radar receiver and its location is undetectable.
+*Since an existing transmitter is used, the passive radar receiver and its location is undetectable.
-•	Relatively low cost because a passive radar system does not require a transmitter, rotating elements and has low power requirements.
+*Relatively low cost because a passive radar system does not require a transmitter, rotating elements and has low power requirements.
-•	Passive radar systems are inherently resistant to jamming due to its location being unknown.
+*Passive radar systems are inherently resistant to jamming due to its location being unknown.
-•	Almost any emission can be used as the basis of a passive radar.
+*Almost any emission can be used as the basis of a passive radar.
 These advantages can all be attributed to the use of an existing transmitter as the reference signal for the passive radar system. Some examples of transmitters include FM radio, DAB radio, DVB-T or digital television signals, and GSM or cellular network.

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 == Background ==
 === What is passive radar? ===
-The most significant difference between passive and active radar is that passive radar utilises existing transmitters to illuminate targets. In this project we are using a digital audio broadcast (DAB) signal as our transmitter. The radiation scattered from the target is captured at recievers placed remotely from the transmitter.
+Passive radar can be described as a set of radar techniques that utilise existing signals as their transmitting source. This is the significant distinction between passive and active radar, as the latter uses a dedicated transmitter and single antenna for both transmitting and receiving. Another further distinction is that the transmit sources used in passive radar systems are noncooperative sources as opposed to active radar where the form of the signal is optimised for the radar function.
 [[File:Multistatic Passive Radar System.png|thumb|right|Multistatic Passive Radar System]]
 === Advantages of passive radar ===
 *The receiver emits no signal of its own, so the passive radar’s signal and location are undetectable by its targets and hence completely covert.
-*Passive radar systems make use of existing transmitters, so the cost of passive radar is much lower than conventional radar. There are no rotating elements, no transmitter and low power requirements.
+There are many advantages of using passive radar, many of these are of significant interest to the defence industry, particularly for air defence systems because it provides situational awareness. The main benefits of passive radar are listed below:
-*Passive radar has many applications in the defence industry (specifically air defence systems) as it provides the surveillance data to support situational awareness.
+•	Since an existing transmitter is used, the passive radar receiver and its location is undetectable.
 == Method ==