TAILIEUCHUNG - Báo cáo "Design of phase-coded transmitter and high sensitive receiver of radar system "

This paper reports experimental results of a radar system design. In the radar transmitter, a 13-bit Barker code with bit duration µs and various other codes are generated by the microcontroller PIC16F877A. This code is then used to modulate IF MHz to become BPSK signal. A stable local oscillator is also designed by PLL, VCO, and PIC16F877A. The operation frequency range of the oscillator is from 800 MHz to 900 | VNU Journal of Science Mathematics - Physics 25 2009 99-105 Design of phase-coded transmitter and high sensitive receiver of radar system Do Trung Kien1 Bach Gia Duong2 Nguyen Quy Thuong3 Nguyen Manh Hung1 1 Faculty of Physics College of Science VNU 334 Nguyen Trai Thanh Xuan Hanoi Vietnam 2Research center for Electronics and Telecommunications College of Technology VNU 144 Xuan Thuy Cau Giay Hanoi Vietnam 3Vietnam National University 144 Xuan Thuy Cau Giay Hanoi Vietnam Received 10 June 2009 received in revised form 13 July 2009 Abstract. This paper reports experimental results of a radar system design. In the radar transmitter a 13-bit Barker code with bit duration Lis and various other codes are generated by the microcontroller PIC16F877A. This code is then used to modulate IF MHz to become BPSK signal. A stable local oscillator is also designed by PLL VCO and PIC16F877A. The operation frequency range of the oscillator is from 800 MHz to 900 MHz with an error only about 10 Hz. A microwave power amplifier is fabricated with structure of two stages of 45 W and 90 W in case of input 300 mW. In this amplifier microstrip technique is implemented for input output matching network. In the receiver subsystem can receive and decode very small signal with amplitude from -30 dBm to -108 dBm and frequency range from 800 MHz to 900 MHz. Keywords Barker code BPSK signal Stable Local Oscillator Microwave Power Amplifier. 1. Introduction Radar is identified as a device for detection ranging and recognition of variety of targets. Because of great diversity of applications in military and civil the designing of radar system is usually based on purpose. For radar systems in Vietnam the research results were often used very complex schematics that limited the operation of systems. Therefore our working focuses on design radar system components using modern electronic devices and techniques. In radar transmitter Barker code generator phase-coded modulator and local .

• Báo cáo khoa học
• phase coded
• Mathematics
• Physics
• Scientific reports
• scientific studies
• natural sciences
• Giới thiệu Thư viện số
• Natural Sciences Digital Library
• Thư viện số
• Digital Library
• Bộ sưu tập Thư viện số
• Summary of Doctoral Thesis
• Educational Sciences
• Methodology in Biology
• Developing textbooks’ models
• Orientation of competency development
• Methods of teaching natural science
• Annals of Agricultural Sciences
• Agricultural Sciences
• Khoa học nông nghiệp
• Natural preservatives
• Cold storage
• the natural sciences
• the social sciences
• conduct and misconduct
• Misconduct and why it occurs
• misconduct affecting
• the truth claims
• Molecular cryocrystal
• Elastic moduli
• Elastic wave
• Elastic constants
• Mathematical sciences
• Physical sciences
• Sciences
• GMAT
• math test
• McGraw Hills GMAT
• Environmental sciences
• Earth sciences
• Natural organic matters removal
• Water purification
• DBPs control
• Technology sciences
• Vecny este epoxy alkyd
• Tính chất điện
• Độ bền dung môi
• Độ bền nhiệt
• Detailed checklist
• Field labels
• Grammitid specimens
• VNU University of Science
• Xác định biên
• Dị thường từ
• Dị thường trọng lực
• Bắc Việt Nam
• Mỡ cá tra
• Etyl cacboxylate
• Etyl biodiesel
• Este axit omega 3 6 9
• Phương pháp đồng dung môi
• Đồng dung môi
• Hợp chất chứa dị vòng
• Chất xúc tác
• Phản ứng Sonogashira
• Hợp chất dị vòng năm cạnh
• Phản ứng Click
• Nano đồng
• Nano silica
• Khả năng kháng nấm
• Pyricularia oryzae
• Rhizoctonia solani
• Phân loại thực vật
• Lạng Sơn
• Aspidistra papillata
• Plant taxonomy
• Arachniodes simplicior
• Flora of Vietnam
• New record
• Phản ứng ngưng tụ croton
• Hoạt tính kháng khuẩn
• Chương trình PASS
• Dẫn xuất thiopodand
• Vật liệu nano
• Tính chất quang
• Tính chất từ
• Vật liệu nano HoFeO3
• Cảm biến miễn dịch điện hóa
• Kháng thể IgY
• Virus Newcastle
• Bình phản ứng mini
• Xúc tác lưỡng kim loại Co2Cu2
• CI NEB cơ chế phản ứng
• Phản ứng hydrogen hóa carbon monoxide
• Bọ rùa hai mảng đỏ
• Lemnia biplagiata
• Tỷ lệ sống sót
• Tỷ lệ vào nhộng
• Năng ăn con mồi
• Chất lượng nước
• Động vật nổi
• Thành phần loài
• Kênh Bún Xáng
• Đa dạng sinh học
• Camphor
• science and technology
• research projects
• scientific research
• Natural resources
• Research
• Natural radioactivity
• Major and accessory minerals
• Gamma ray spectrometry
• Wall rock granitoids
• Natural sciences and Technology
• Immune cells expansion
• Peripheral blood
• Immune cell therapy
• Natural killer cells
• Cytotoxic T lymphocytes
• Peripheral blood mononuclear cells