Random Two-phase Code Ranging Velocity Shells, Radio Detection Systems

Since the Gulf War, more and more people pay attention to the anti-jamming capability of weapons systems. Noise signal radar provided with strong ability of anti-jamming, thumb tack-ambiguity map,high resolution of range and speed . As a result, the noise signal radar abtain people's highly attention.Since 1994,Our company started to develop randon binary phase code signal system. In 2006, our company cooperates with the Nanjing University of Science, develops the randon binary phase code fuze. Products through the examination of the flight test, the ability of anti-jamming,, highly resolution of range and speed, and other characteristics have been verified.Our company plan to apply the randon binary phase code signal in project. As a professional institute, we are not satisfied with access to some basic concepts of random signal radar, Would rather spend a certain price ,To study the signal theory. From point of signal theory view, why it has ability of anti-jamming, thumb tack ambiguity map,high resolution of range and speed? According to the company's product development background and Engineering master's thesis requirement, We are scheme out the subject.The second chapter of the paper analyzes the ambiguity function of randon binary phase code signal by mathematical method, randon binary phase code signal is a complex signal modulation, Be decompose into phase encoded impulse series and single pulse, Both the ambiguity function was derived, As the nature of convolution of the ambiguity function, reached the final results. The ambiguity function includes the expression of the four conditions, Contains a number of product items, Using the modern computer technology, step by step analyze each product.To clarify ambiguity function composition, choosing a long signal, it achieves statistical picture of the ambiguity function. Paper have dealed with the special circumstances of which the delay is integral unit of code,about the circumstances of which the delay is non-integral unit of code it has also made an equivalent analysis.In order to educe the statistical average characteristic of ambiguity function of randon binary phase code signal, In the mathematical derivation, 4 randon binary phase code signals was centralized for calculating the mean, If they isn't correlative, the average equal to 0, if correlative, the average equal to 1. According to the single pulse delay, the integral boundary has been divided into four different cases. The resultant expression average ambiguity function contains three sections, each section includes different expressions. Due to having eliminated of the randon code variable, the products of expression is simple and clear. The graphics of average ambiguity function have drawn out . The third chapter of the paper analyze the spectrum of the randon binary phase code signal, it possesses practical significance.The fourth chapter of the paper studies the radar signal detection and implement in project. Leakage is important problem of CW radar, Approach of periodic square-wave interruption can be used for solution of the leakage of CW radar. According to the diagram of the system, described the project design. Another important part of this chapter is estimation of signal's spectrum, for which is to pursue a lower side-lobe. Using Fast Fourier Transform, Spectrum was estimated, Through the simulation, Come to the thumb tack-ambiguity map. Through Burg recursive algorithm, Spectrum was estimated, and Come to the thumb tack-ambiguity map too. Both result was compared. Development of a radio detonator has chosen randon binary phase code signal , it's performance is verified, development have made better result.